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ACTIVE POWER INC (ACPW)

Active Power, Inc. (API) engages in the design, manufacture, and marketing of battery-free power products that provide electric power in the United States, Europe, and Africa. It offers CleanSource UPS, a battery-free uninterruptible power supply (UPS) under the Caterpillar brand name, Cat UPS. The company also provides a battery-free DC system, CleanSource DC that is used as a bridging energy source in power quality installations and compatible with various UPS brands. API's family of battery-free UPS products ranges from 65 kVA1200 kVA. In addition, it develops GenSTART, a battery-free, starting modular system that adds additional lines of availability to multiple standby generator sets. API distributes its products through various channels, including original equipment manufacturers, independent representatives, and direct sales personnel. The company, formerly known as Magnetic Bearing Technologies, Inc., was founded by Joseph F. Pinkerton in 1992. It changed its name to Active Power, Inc. in 1996. The company is headquartered in Austin, Texas.


AMEREN CORPORATION (AEE)

Ameren Corporation, through its subsidiaries, engages in rate-regulated electric generation, transmission, and distribution; rate-regulated natural gas distribution; and nonrate-regulated electric generation businesses in Missouri and Illinois. The company also engages in the short- and long-term marketing of power, procurement of fuel, management of commodity risks, and provision of other shared services. As of May 12, 2005, it provided energy services to approximately 2.3 million electric customers and approximately 900,000 natural gas customers in Illinois and Missouri. Ameren was founded in 1881 and is headquartered in St. Louis, Missouri.


AMERICAN ELECTRIC POWER COMPANY INC (AEP)

American Electric Power Company, Inc. (AEC), a public utility holding company, which principally engages in the generation, transmission, and distribution of electric power in the United States. The company offers its electric services to the natural gas and oil production, oil refining, steel processing, aircraft maintenance, paper manufacturing and timber products, glass, chemicals, cement, plastics, aerospace manufacturing, telecommunications, rubber goods, concrete products, food processing, transportation equipment, electrical and electronic machinery, fabricated metal products, and various other industries. It offers its services primarily in the states of Arkansas, Indiana, Kentucky, Louisiana, Michigan, Ohio, Oklahoma, Tennessee, Texas, Virginia, and West Virginia. AEC also operates as an energy marketer in North America and the United Kingdom. The company was incorporated in 1906. It was formerly known as American Gas and Electric Company and changed its name to American Electric Power Company, Inc. in 1958. American Electric Power Company is based in Columbus, Ohio.


AES TRUST (AES)

The AES Corporation, through its subsidiaries, engages in the ownership and operation of electric power generation and distribution businesses worldwide. It operates in four segments: Contract Generation, Competitive Supply, Large Utilities, and Growth Distribution. The Contract Generation segment supplies wholesale electricity under long-term contracts. The Competitive Supply segment supplies wholesale electricity pursuant to short-term contracts or to spot electricity markets. Competitive Supply segment owns power plants, which sell electricity to wholesale customers. The Large Utility segment owns utilities that maintain a franchise within a defined service area. Growth Distribution segment operates electricity distribution facilities, which offers generation, transmission, distribution, and related services. As of December 31, 2004, the company generated approximately 44 gigawatts of capacity and sold approximately 88,890 gigawatt hours per year. The AES Corporation has a strategic partnership with XL Techgroup, Inc. to identify market needs across the energy sector, with an emphasis on opportunities in the renewable energy field. The company was formed in 1981 and is based in Arlington, Virginia.


ALLETE INC (ALE)

ALLETE, Inc. engages in the generation, transmission, distribution, and marketing of electrical power for retail and wholesale customers in the upper midwest of the United States. The company's Regulated Utility segment provides retail and wholesale rate regulated electric, water, and gas services in northeastern Minnesota and northwestern Wisconsin. Its Minnesota Power division provides regulated utility electric service in a 26,000 square mile service territory in northeastern Minnesota. It provided regulated utility electric service to approximately 136,000 retail customers; and wholesale electric service to 16 municipalities, as of December 31, 2004. The company's wholly owned subsidiary, Superior Water, Light and Power Company, provides regulated utility electric, natural gas, and water service in northwestern Wisconsin. It had approximately 14,000 electric customers, 12,000 natural gas customers, and 10,000 water customers, as of the above date. ALLETE's Nonregulated Energy Operations segment includes nonregulated generation consisting primarily of generation from Taconite Harbor in northern Minnesota, and its coal mining activities in North Dakota. In addition, the company engages in the real estate and telecommunications businesses; and invests in emerging technologies related to the electric utility industry. ALLETE was incorporated in 1906 and is headquartered in Duluth, Minnesota.


ARTESIAN RESOURCES CORPORATION (ARTNA)

Artesian Resources Corporation, through its subsidiaries, engages in the distribution and sale of water to residential, commercial, industrial, governmental, municipal, and utility customers in Delaware. The company's other subsidiaries, Artesian Wastewater Management, Inc. and Artesian Utility Development, Inc., provide waste water services. Artesian Resources also provides water for public and private fire protection to customers in its service territories. The company also provides operation and billing functions for its customers. As of December 31, 2004, it had 109 operating and 60 monitoring wells. Artesian Resources is headquartered in Newark, Delaware.


AGL RESOURCES INC (ATG)

AGL Resources, Inc., an energy services holding company, distributes natural gas primarily in Florida, Georgia, Maryland, New Jersey, Tennessee, and Virginia. The company operates in three segments: Distribution Operations, Wholesale Services, and Energy Investment. Distribution Operation segment distributes natural gas to residential and commercial customer markets. Wholesale Services segment provides transportation and storage, and wholesale marketing services. Energy Investments segment comprises investments in SouthStar Energy Services LLC, which markets natural gas and related services to retail customers primarily in Georgia; Pivotal Jefferson Island Storage & Hub, LLC, which operates a storage and hub facility in Louisiana; Virginia Gas Company that operates a pipeline and distribution company in Southwestern Virginia; and AGL Networks, LLC, which provides telecommunications conduit and dark fiber. As of December 31, 2004, the company had approximately 7.35 billion cubic feet of liquefied natural gas (LNG) storage capacity in five LNG plants located in Georgia, New Jersey, and Tennessee, as well as owned three propane storage facilities in Virginia and Georgia, which have a combined capacity of approximately 4.5 million gallons. AGL Resources is headquartered in Atlanta, Georgia.


ATMOS ENERGY CORPORATION (ATO)

Atmos Energy Corporation and its subsidiaries engage in the natural gas utility business, as well as in other natural gas nonutility businesses in the United States. As of September 30, 2005, the company distributed natural gas to approximately 3.2 million residential, commercial, public authority, and industrial customers in Colorado, Kansas, Kentucky, Louisiana, Mississippi, Tennessee, and Texas, as well as in Georgia, Illinois, Iowa, Missouri, and Virginia. In addition, it transports natural gas for others through its distribution system. Atmos Energy also provides natural gas management services, which include furnishing natural gas supplies at fixed and market-based prices, contract negotiation and administration, load forecasting, gas storage acquisition and management services, transportation services, peaking sales and balancing services, capacity utilization strategies, and gas price management to municipalities, other local gas distribution companies, and industrial customers. Further, it offers regulated and nonregulated natural gas transmission and storage services. As of the above date, the company owned approximately 81,604 miles of underground distribution and transmission mains, as well as 6,369 miles of gas transmission and gathering lines. Atmos Energy was founded in 1906 and is headquartered in Dallas, Texas.


AVISTA CORPORATION (AVA)

Avista Corporation engages in the generation, transmission, and distribution of energy, as well as other energy-related businesses. It operates in four segments: Avista Utilities, Energy Marketing and Resource Management, Avista Advantage, and Other. The Avista Utilities segment generates, transmits, and distributes electricity; and distributes natural gas, as well as purchases and sells electric capacity and energy. The Energy Marketing and Resource Management segment engages in the electricity and natural gas marketing, trading, and resource management business, as well as has 49% interest in a 270 MW natural gas-fired combined cycle combustion turbine plant in northern Idaho. The Avista Advantage segment provides utility bill processing, payment, and information services to multisite customers in North America. This segment primarily offers consolidated billing, resource accounting, energy analysis, and load profiling services. The Other segment involves in advanced manufacturing and development that performs custom sheet metal manufacturing of electronic enclosures, parts, and systems for the computer, telecom, and medical industries. It also provides fabrication and turnkey assembly for arcade games, kiosks, store fixtures, and displays. Avista distributes energy primarily to residential, commercial, and industrial customers in the United States and Canada. The company was founded in 1889. It was formerly known as Washington Water Power Co. and changed its name to Avista Corporation in 1999. Avista is headquartered in Spokane, Washington.


AMERICAN STATES WATER COMPANY (AWR)

American States Water Company, through its principal subsidiary, Southern California Water Company (SCW), engages in the purchase, production, distribution, and sale of water. It also distributes electricity in one customer service area. SCW operates in 75 communities in 10 counties in the State of California and provides water service in 21 customer service areas. SCW also provides electric service to the City of Big Bear Lake and surrounding areas in San Bernardino County through its Bear Valley Electric Service division. As of March 31, 2005, it served 251,715 water customers and 22,675 electric customers. The company, through its other subsidiaries, served 12,645 customers located in the town of Fountain Hills, Arizona and a portion of the City of Scottsdale, Arizona, as of the above date. In addition, the company provides water and wastewater services, including billing and meter reading, water marketing, and the operation and maintenance of water and wastewater systems to various municipalities, the U.S. government, and private entities. American States Water Company was founded in 1929 and is headquartered in San Dimas, California.


ALLEGHENY ENERGY INC (AYE)

Allegheny Energy, Inc., through its directly and indirectly owned subsidiaries, engages in the ownership and operation of electric generation facilities, as well as in the delivery of electric and natural gas services. The company operates through two segments, Delivery and Services, and Generation and Marketing. The Delivery and Services segment operates electric and natural gas public utility systems. This segment also engages telecommunications and unregulated energy-related projects. The Generation and Marketing segment owns, operates, and controls electric generation facilities, as well as purchases and sells energy and energy-related commodities. As of December 31, 2004, this segment had 10,851 megawatts of generation capacity. Allegheny Energy offers its services to customers in Pennsylvania, West Virginia, Maryland, Virginia, and Ohio. The company was incorporated in 1925 and is headquartered in Greensburg, Pennsylvania.


BEACON POWER CORPORATION (BCON)

Beacon Power Corporation, a development stage company, engages in the design, development, configuration, and sale of products and services to support electricity grid operation. The company develops alternative sustainable energy storage and power conversion solutions that provide electric power for the renewable energy, telecommunications, distributed generation, and uninterrupted power supply markets in the United States. Its development stage products include Smart Energy matrix, Smart Power M5 inverter system, and Smart Energy system. Smart Energy matrix regulates the frequency of electricity on the power grid. It also regulates the frequency of electricity produced by a distributed generation facility and compensate for temporary differences between the demand for electricity and the amount being produced by that facility. Smart Power M5 inverter system converts direct current electricity produced by photovoltaic panels into alternating current electricity for residential and commercial use. Smart Energy system stores electricity for telecommunications, cable systems, computer networks, and Internet markets applications. Beacon Power Corporation was founded in 1997 and is based in Wilmington, Massachusetts.


BIW LIMITED (BIW)

BIW Limited, through its subsidiary, Birmingham Utilities, Inc., operates as a regulated public water service company in Connecticut. The company engages in the collection and distribution of water for domestic, commercial, and industrial uses, as well as for fire protection in Ansonia and Derby, Connecticut; and in small parts of Seymour. It also provides water service for domestic and commercial use in 30 satellite water operations in 16 towns in eastern Connecticut. In addition, the company offers a consumer protection program for residential service lines and provides water related services to other water utilities, municipalities, contractors, and individuals in Connecticut. BIW Limited is based in Ansonia, Connecticut.


BLACK HILLS CORPORATION (BKH)

Black Hills Corporation operates as an energy company. The company operates through two groups, Whole Sale Energy and Retail Services. The Whole Sale Energy group's activities include production and sale of electric capacity and energy in the Rocky Mountain and western regions of the United States; production of natural gas and crude oil in the Rocky Mountain region of the United States; mining and production of coal; and marketing and transportion of fuel products in the western and mid-continent regions of the United States, and in western Canada. The Retail Services group consists of electric, communications, and combination electric and gas utilities. Its electric utility generates, transmits, and distributes electricity to approximately 62,000 customers in South Dakota, Wyoming, and Montana; and the sells electric energy and capacity on a wholesale or off-system basis. The group's communications utility provides broadband telecommunications services, including local and long distance telephone service, expanded cable television service, cable modem Internet access, and high speed data and video services to residential and business customers in South Dakota. Its combination electric and gas utility provides electricity to approximately 38,000 customers; and natural gas to 31,000 customers in Cheyenne, Wyoming, and vicinity. As of December 31, 2004, the company had 173,417 million cubic feet of total proved oil and natural gas reserves; and 294 millions of tons of coal reserves. It also operated approximately 516 oil and gas wells. Black Hills was incorporated in 1941 and is based in Rapid City, South Dakota.


CONSTELLATION ENERGY GROUP INC (CEG)

Constellation Energy Group, Inc., a holding company, supplies electricity to commercial and industrial customers in North America. The company operates through three segments: Merchant Energy, Regulated Electric, and Regulated Gas. The Merchant Energy segment engages in the ownership, operation, and maintenance of fossil, nuclear, and hydroelectric generating facilities. It also provides risk management services for various customers, including hedging of output from generating facilities and fuel costs; coal sourcing services for the North American and international power generators; and operations and maintenance consulting services. In addition, the Merchant Segment provides customized energy related products and services to government, commercial, and industrial customers, which include utility infrastructure outsourcing, mechanical/electrical upgrades, utility data mining, and performance contracting. The Regulated Electric segment purchases, transmits, distributes, and sells electricity in Maryland. The Regulated Gas business purchases, transports, and sells natural gas in Maryland. Constellation Energy also designs, constructs, and operates heating, cooling, and cogeneration facilities for commercial, industrial, and governmental customers throughout North America. In addition, it sells home improvements, and sells and services heating, air conditioning, plumbing, electrical, and indoor air quality systems. Constellation Energy Group was founded in 1906 and is headquartered in Baltimore, Maryland.


CH ENERGY GROUP INC (CHG)

CH Energy Group, Inc. operates as the holding company of Central Hudson Gas & Electric Corporation (Central Hudson) and Central Hudson Enterprises Corporation (CHEC). Central Hudson purchases, sells at wholesale, and distributes electricity and natural gas in portions of New York State. It also generates a portion of its electricity requirements. Its customers include manufacturing industries, research firms, farms, governmental agencies, public and private institutions, resorts, and wholesale and retail trade operations. As of December 31, 2004, Central Hudson's natural gas system consisted of 161 miles of transmission pipelines and 1,068 miles of distribution pipelines. CHEC engages in the business of marketing electricity, natural gas, petroleum products, and related services to retail and wholesale customers; conducting energy audits; and providing services, including the design, financing, installation, and maintenance of energy conservation measures and generation systems for private businesses, institutions, and government entities in the United States. The company was founded in 1926 and is based in Poughkeepsie, New York.


CMS ENERGY CORPORATION (CMS)

CMS Energy Corporation, through its subsidiaries, Consumers Energy Company and CMS Enterprises Company, operates energy businesses in the United States and in selected markets worldwide. The company primarily operates in three segments: Electric Utility, Gas Utility, and Enterprises. The Electric Utility segment generates and distributes electricity in the state of Michigan. The Gas Utility segment purchases transports, stores, and distributes natural gas. The Enterprises segment invests, acquires, develops, constructs, manages, and operates nonutility power generation plants and natural gas facilities in the United States and internationally. It also provides gas, oil, and electric marketing services to energy users. The company provides natural gas and electricity to approximately 6 million residential consumers. It also serves automotive, metal, chemical, food products, and various other industries. CMS Energy was formed in 1987 and is headquartered in Jackson, Michigan.


CLECO POWER LLC (CNL)

Cleco Corporation, through its subsidiaries, operates as an energy services company. Its subsidiary, Cleco Power LLC, provides electric utility services, which include generation, transmission, and distribution of electricity to approximately 265,000 retail and wholesale customers in 103 communities in central and southeastern Louisiana. As of December 31, 2004, Cleco Power owned 3 steam electric generating stations and 1 gas turbine with a combined electric net generating capacity of 1,359 MW; and 70 active transmission substations and 222 active distribution substations. The company's another subsidiary, Cleco Midstream Resources LLC, owns and operates two wholesale electric generation stations and invests in joint ventures that own and operate merchant generation stations in Louisiana and Texas. As of the above date, Cleco Midstream owned two steam electric generating stations, Evangeline and Perryville; and had a 50% ownership interest in an additional station, Acadia. The company also involves in energy management activities. It serves residential, commercial, and industrial customers. The company is headquartered in Pineville, Louisiana.


CHESAPEAKE UTILITIES CORPORATION (CPK)

Chesapeake Utilities Corporation, through its subsidiaries, engages in the distribution and transmission of natural gas in the United States. It also distributes and markets propane. As of December 31, 2004, the company distributed natural gas to approximately 50,900 residential, commercial, and industrial customers in central and southern Delaware, Maryland's eastern shore, and parts of Florida. It also distributed propane to approximately 34,900 customers in central and southern Delaware, the eastern shore of Maryland and Virginia, and parts of Florida, as of the above date. In addition, Chesapeake Utilities offers natural gas supply and supply management services in Florida; and provides domestic and international clients with information technology-related business services and solutions for enterprise and e-business applications. The company, formerly known as The Dover Gas Light Company, was formed in 1859 and is headquartered in Dover, Delaware.


CONNECTICUT WATER SERVICE INC (CTWS)

Connecticut Water Service, Inc., through its subsidiaries, supplies drinking water in Connecticut. The company operates in three segments: Water Activities, Real Estate Transactions, and Services and Rentals. Water Activities segment supplies public drinking water. In addition, it provides sewer operations and other water related services. Real Estate Transactions segment involves in the sale of its excess real estate holdings. Services and Rentals segment provides contracted services to water and wastewater utilities and other clients. It also leases its real estate properties to third parties. As of May 20, 2005, the company supplied drinking water to approximately 80,000 customers in 41 towns. Connecticut Water Service was organized in 1956 and is headquartered in Clinton, Connecticut.


CENTRAL VERMONT PUB SVC (CV)

Central Vermont Public Service Corporation engages in the transmission, distribution, and sale of electricity to residential, commercial, and industrial customers in Vermont. It also invests in wind energy projects in the United States and the United Kingdom; and engages in the sale or rental of electric water heaters to customers in Vermont and New Hampshire. As of July 27, 2005, the company served approximately 150,000 customers. Central Vermont Public Service Corporation was incorporated in 1929 and is based in Rutland, Vermont.


CONSOLIDATED WATER CO. LTD (CWCO)

Consolidated Water Co., Ltd. (CWC) engages in processing and distributing water in the Cayman Islands, Belize, Barbados, the British Virgin Islands, and the Commonwealth of the Bahamas. The company uses reverse osmosis technology to produce freshwater from seawater and distributes this water to public utilities, government facilities, and commercial, tourist, and residential properties. CWC also provides sewerage services in Grand Cayman. The company was incorporated in 1973 and is based in Grand Cayman, Cayman Islands.


CALIFORNIA WATER SERVICE GROUP HOLDING (CWT)

California Water Service Group (CWS), through its subsidiaries, provides water utility and other related services in California, Washington, New Mexico, and Hawaii. The company engages in the production, purchase, storage, purification, testing, distribution, and sale of water for industrial, public, and irrigation uses, as well as for fire protection. CWS provides its services to approximately 2 million people in 100 communities. It also provides nonregulated water utility and utility-related services, which primarily consist of operating water systems, which are owned by other entities; providing meter reading and billing services; operating recycled water systems; providing brokerage services for water rights; and providing lab services for water quality testing. California Water services Group is headquartered in San Jose, California.


DOMINION RESOURCES INC (D)

Dominion Resources, Inc. operates as an integrated gas and electric holding company. It operates through four segments: Dominion Delivery (DD), Dominion Energy (DE), Dominion Exploration and Production (DEP), and Dominion Generation (DG). Dominion Delivery segment manages the company's electric and gas distribution systems and customer service operations, as well as retail energy marketing operations. Dominion Energy segment operates gas transmission pipeline and storage system; electric transmission system; LNG import and storage facility; and energy trading, marketing, hedging, and arbitrage activities. Dominion Exploration and Production segment manages the company's gas and oil exploration, development, and production operations. Dominion Generation segment manages the generation operations of Dominion's electric utility and merchant fleet, and its power purchase agreements. Its generation facilities are located in Virginia, West Virginia, North Carolina, Connecticut, Illinois, Indiana, Pennsylvania, and Ohio. As of December 31, 2004, DD's electric distribution network included approximately 54,000 miles of distribution lines; DE had approximately 6,000 miles of electric transmission lines located in the states of North Carolina, Virginia, and West Virginia; DEP owned 5.9 trillion cubic feet of proved equivalent natural gas reserves; and DG had proved gas and oil reserves of 5,003 billion cubic feet and 148,598 barrels. The company serves governmental agencies and wholesale customers, such as rural electric cooperatives, municipalities, power marketers, and other utilities in Virginia and northeastern North Carolina, as well as residential, commercial, and industrial gas sales and transportation customer accounts in Ohio, Pennsylvania, and West Virginia. Dominion Resources was founded in 1909 and is headquartered in Richmond, Virginia.


DELTA NATURAL GAS COMPANY INC (DGAS)

Delta Natural Gas Company, Inc. sells natural gas to retail customers in central and southeastern Kentucky. It also transports natural gas to industrial customers. As of June 30, 2005, the company distributed natural gas to approximately 40,000 retail customers. It also owned approximately 2,450 miles of natural gas gathering, transmission, distribution, storage, and service lines, as of the above date. In addition, the company, through its wholly owned subsidiary, Enpro, Inc. produces natural gas from its southeastern Kentucky wells. Delta Natural Gas Company was formed in 1949 and is headquartered in Winchester, Kentucky.


DPL INC (DPL)

DPL, Inc. operates as a regional electric energy and utility company. The company provides electricity to approximately 500,000 retail customers in west central Ohio. It operates merchant peaking generation facilities. The company sells retail electric energy under contract to governmental, industrial, and commercial customers. It primarily serves automotive, food processing, paper, plastic manufacturing, and defense industries. As of December 31, 2004, DPL owned and operated approximately 4,400 megawatts of generation capacity, of which 2800 megawatts were coal fired units and 1,600 megawatts were natural gas fired peak units. The company was organized in 1985 and is based in Dayton, Ohio.


DTE ENERGY COMPANY (DTE)

DTE Energy Company, through its subsidiaries, provides electricity and natural gas sales and distribution services in southeastern Michigan. It operates through three segments: Energy Resources, Energy Distribution, and Energy Gas. The Energy Resources Segment (ERS) generates electricity from fossil plants, hydroelectric pumped storage plant, and nuclear plant; purchases electricity from various electricity generators, suppliers, and wholesalers; and sells to residential, commercial, industrial, and wholesale customers in Canada. Its energy services unit includes coal-based fuels operations that produce synthetic fuel from synfuel plants and coke from coke battery plants; owns and/or operates onsite facilities, including pulverized coal injection, power generation, steam production, chilled water, wastewater treatment, and compressed air; and operates peaking and gas-fired electric generating plants. In addition, ERS involves in wholesale electric and gas marketing, and trading operations; provides fuel, transportation, and equipment management services; and develops, owns, and operates landfill gas recovery systems. The Energy Distribution Segment distributes electricity generated by ERS' power generation business and alternative energy suppliers; develops, markets, and distributes a portfolio of distributed generation products; and provides application engineering services, as well as monitors and manages system operations. The Energy Gas Segment involves in gas distribution, providing gas sales and transportation delivery services to approximately 1.2 million residential, commercial, and industrial customers in Michigan; and gas production, including natural gas exploration, development, and production, as well as has interests in interstate transmission pipeline, Vector Pipeline, 7 carbon dioxide processing facilities, and a 9.7 billion cubic feet of natural gas storage field. DTE Energy was incorporated in 1995 and is headquartered in Detroit, Michigan.


DUKE ENERGY CORPORATION (DUK)

Duke Energy Corporation (DEC) engages in the natural gas and electric businesses in America. The company also supplies, delivers, and processes energy. It operates in six divisions: Franchised Electric, Natural Gas Transmission, Field Services, Duke Energy North America (DENA), International Energy, and Crescent Resources (crescent). The Franchised Electric division generates, transmits, distributes, and sells electricity in central and western North Carolina and western South Carolina. The Natural Gas Transmission division provides transportation and storage of natural gas along the U.S. East Coast, the Southeast, and in Canada. It also provides natural gas sales and distribution service to retail customers in Ontario, and natural gas processing services to customers in Western Canada. The Field Services division gathers, compresses, treats, processes, transports, trades and markets, and stores natural gas; and fractionates, transports, trades and markets, and stores natural gas liquids. The DENA division operates and manages power plants, and markets electric power and natural gas in the U.S. and Canada. The International Energy division operates and manages power generation facilities, and sells and markets electric power and natural gas. The Crescent division develops and manages commercial, residential, and multi family real estate projects primarily in the southeastern and southwestern United States. In addition, the company develops, owns, and operates a fiber optic communications network primarily in the Carolinas. It serves wireless, local and long-distance communications companies, Internet service providers and other businesses and organizations through DukeNet Communications, LLC; and provides insurance and reinsurance of various business risks and losses, such as workers compensation, property, business interruption, and general liability of subsidiaries, through Bison Insurance Company Limited. DEC is headquartered in Charlotte, North Carolina.


ENERGY EAST CORPORATION (EAS)

Energy East Corporation, a holding company, operates as an energy services company in New York, Connecticut, Massachusetts, Maine, and New Hampshire. The company's energy operations primarily consist of regulated electricity transmission, distribution, and generation operations in upstate New York and Maine, as well as regulated natural gas transportation, storage, and distribution operations in upstate New York, Connecticut, Maine, and Massachusetts. As of December 31, 2004, it served approximately 1.8 million electricity customers and 900,000 natural gas customers. Energy East also operates a nonutility generating company, a Federal Energy Regulatory Commission regulated liquefied natural gas peaking plant, retail energy marketing companies, a natural gas delivery company, a propane air delivery company, and an energy services company. It has a strategic alliance with BP Energy Company for natural gas supply, transportation, and storage services. Energy East is based in New Gloucester, Maine.


CONSOLIDATED EDISON INC (ED)

Consolidated Edison, Inc. (Con Edison), a holding company, engages in the energy business in the United States. The company, through Consolidated Edison Company of New York, Inc., provides electric service to approximately 3.2 million customers and gas service to approximately 1 million customers in New York City and Westchester County. The company also provides steam service in parts of Manhattan. Con Edison, through Orange & Rockland Utilities, Inc., provides electric service to approximately 0.3 million customers in southeastern New York and adjacent areas of northern New Jersey and eastern Pennsylvania and gas service to approximately 0.1 million customers in southeastern New York and adjacent areas of eastern Pennsylvania. Consolidated Edison was founded in 1884 and is based in New York City.


EMPIRE DISTRICT ELECTRIC COMPANY (EDE)

The Empire District Electric Company engages in the generation, purchase, transmission, distribution, and sale of electricity in parts of Missouri, Kansas, Oklahoma, and Arkansas. It also provides water service to three towns in Missouri and has investments in certain nonregulated businesses, including fiber optics, Internet access, close-tolerance custom manufacturing, and customer information system software services. As of December 31, 2004, it owned and operated water pumping facilities and distribution systems consisting of approximately 84 miles of water mains. The company was founded in 1909 and is headquartered in Joplin, Missouri.


EL PASO ELECTRIC COMPANY (EE)

El Paso Electric Company engages in the generation, transmission, and distribution of electricity in the United States. It serves retail customers in west Texas and southern New Mexico; and wholesale customers in Texas and the Republic of Mexico. The company owns or has ownership interests in 6 electrical generating facilities that comprise 15.8% interest in 3 nuclear generating units and common facilities at Palo Verde, Arizona; Newman Power Station in El Paso, Texas; Rio Grande Power Station in Sunland Park, New Mexico; and 7% interest in Units 4 and 5 at Four Corners station that located in northwestern New Mexico. El Paso Electric also has interests in Copper Power Station in El Paso, Texas; and Hueco Mountain Wind Ranch in Hudspeth County. In addition, it owns or has ownership interests in four 345 Kilovolt (kV) transmission lines in New Mexico, and three 500 kV lines in Arizona, as well as owns the transmission and distribution network within its New Mexico and Texas retail service area. As of July 21, 2005, the company served approximately 334,000 residential, commercial, industrial, and wholesale customers. El Paso Electric was incorporated in 1901 and is based in El Paso, Texas.


ENERGEN CORPORATION (EGN)

Energen Corporation, an energy holding company, through its subsidiaries, engages primarily in the acquisition, development, exploration, and production of oil, natural gas, and natural gas liquids in the continental United States. The company also purchases, distributes, and sells natural gas, principally in central and north Alabama. As of December 31, 2004, Energen's inventory of proved oil and gas reserves totaled 1,554 billion cubic feet equivalent. The company's reserves are located in the San Juan Basin in New Mexico, the Permian Basin in west Texas, the Black Warrior Basin in Alabama, and the north Louisiana/east Texas region. Energen was founded in 1929 and is headquartered in Birmingham, Alabama.


EDISON INTERNATIONAL (EIX)

Edison International, through its subsidiary, Southern California Edison Company (SCE), supplies electric energy in central, coastal, and southern California. SCE owns and operates pressurized water nuclear units located on the California coastline between Los Angeles and San Diego; 33 hydroelectric plants located in California's Sierra Nevada, San Bernardino, and San Gabriel mountain ranges; a diesel-fueled generating plant and a hydroelectric plant located on Santa Catalina Island off the southern California coast; and coal-fueled generating units located in Clark County, Nevada. As of June 17, 2005, it served a population of approximately 13 million people via 4.6 million customer accounts. Edison International, through its indirect subsidiary Edison Mission Energy (EME), also engages in owning or leasing, operating, and selling energy from electric power generation facilities. EME conducts price risk management and energy trading activities in power markets. In addition, the company, through its other subsidiary, Edison Capital (EC), invests in energy and infrastructure projects, including power generation, electric transmission and distribution, transportation, and telecommunications worldwide. EC also has investments in housing projects located throughout the United States. Edison International was founded in 1886 and is based in Rosemead, California.


COMPANHIA PARANAENSE DE ENERGIA (COPEL) (ELP)

Companhia Paranaense de EnergiaCOPEL engages in the generation, transmission, and distribution of electricity in the Brazilian State of Parana. As of December 31, 2004, it generated electricity at 17 hydroelectric plants and 1 thermoelectric plant, with a total installed capacity of 4,550 MW. As of the above date, the company owned and operated 6,996.3 kilometers of transmission lines and 165,576 kilometers of distribution lines in Brazil. In addition, COPEL provides telecommunications and communications services, as well as holds interests in other companies operating in, such areas as power generation and power marketing, piped gas, sanitation, fixed and mobile telephone services, Internet service providers, power and infrastructure projects, research and development, power and project management, and agribusiness. It also offers consulting services to various countries, including Argentina, Chile, China, Colombia, Malaysia, and Paraguay. The company was founded in 1954 and is headquartered in Curitiba, Brazil.


ENEL S.P.A (EN)

ENEL S.p.A, together with its subsidiaries, engages in the generation, distribution, transmission, and sale of electricity principally in Italy. It also engages in the import, distribution, and sale of natural gas. As of December 31, 2004, the company served approximately 23.2 million electric utility customers and 2 million gas utility customers in Italy. ENEL's electricity transmission grid consisted of approximately 38,696 kilometers of lines and 300 primary transformer stations, as of the above date. In addition, it provides mobile and fixed-line telecommunication services, and Internet access services. The company was founded in 1962 and is based in Rome, Italy.


ENERSIS S A (ENI)

Enersis S.A., a holding company, engages in the generation, transmission, and distribution of electricity in Chile, Argentina, Brazil, Colombia, and Peru. The company also has smaller operations in other nonelectricity businesses. The company's Generation segment engages in the generation of electricity primarily through its subsidiary, Endesa-Chile. Its Distribution segment engages in the supply of electricity to regulated and unregulated customers. The company's Engineering Services and Real Estate includes engineering services and real estate development. The company's customers include the distribution companies and industrial firms, which are primarily in the mining, pulp, and steel sectors. Its principal subsidiaries and related companies sold approximately 49,677 gigawatt hours of electricity, as of December 31, 2003. The company was founded in 1889. It was formerly known as Compañía Chilena Metropolitana de Distribución Eléctrica S.A. and changed its name to Enersis S.A. in 1988. The company is headquartered in Santiago, Chile. Enersis S.A. is 60% owned by ENDESA, S.A., as of June 10, 2004.


ENERGYSOUTH INC (ENSI)

EnergySouth, Inc. operates as a holding company for a family of energy businesses. The company operates in two business segments, Natural Gas Distribution and Natural Gas Storage. The Natural Gas Distribution segment engages in the distribution and transportation of natural gas to residential, commercial, and industrial customers in southwest Alabama. The Natural Gas Storage segment provides the underground storage of natural gas and transportation services. It also offers other services, which include merchandising, financing, and energy-related services. EnergySouth was founded in 1906 and is based in Mobile, Alabama.


EMPRESA NACIONAL DE ELECTRICIDAD S.A (EOC)

Empresa Nacional de Electricidad S.A. operates as a public electric generation company with operations in Chile, Argentina, Brazil, Colombia, and Peru. As of December 31, 2004, the company owned and operated 22 generation facilities in Chile with an aggregate installed capacity of 4,477 megawatt (MW) and had interests in 24 generation facilities outside Chile with an aggregate installed capacity of 7,856 MW. It produces electricity from hydroelectric and thermal electric generation facilities. Empresa Nacional also provides electricity transmission and engineering services. The company was formed in 1943 and is headquartered in Santiago, Chile. Empresa Nacional de Electricidad S.A. is a subsidiary of Enersis S.A.


EQUITABLE RESOURCES INC (EQT)

Equitable Resources, Inc. engages in the production, gathering, distribution, and transmission of natural gas in the United States. It also provides energy management solutions. The company and its subsidiaries offer energy products and services to wholesale and retail customers through three segments: Equitable Utilities, Equitable Supply, and NORESCO. Equitable Utilities segment engages in the sale, distribution, and marketing of energy related products and services; and interstate pipeline operations. These services are primarily provided in southwestern Pennsylvania, municipalities in northern West Virginia, eastern Kentucky, and in West Virginia. Its distribution operations provided natural gas services to approximately 276,300 customers, comprising 257,400 residential customers and 18,900 commercial and industrial customers, as of December 31, 2004. Equitable Supply segment engages in the development, production, and sale of natural gas, and crude oil and its associated by-products. It had an estimated total proved reserves of approximately 2,109 billion cubic feet equivalent (Bcfe), including proved undeveloped reserves of 477 Bcfe in the Appalachian Basin, as of December 31, 2004. NORESCO segment provides energy-related products and services primarily to governmental, military, institutional, commercial, and industrial customers. Its products and services principally comprise performance contracting, energy management programs, and combined heat and power, as well as central boiler/chiller plant development, design, construction, ownership, and operation. Equitable Resources was formed in 1925 and is headquartered in Pittsburgh, Pennsylvania.


ENTERGY CORPORATION (ETR)

Entergy Corporation, an integrated energy company, engages primarily in electric power production and retail electric distribution operations. The company operates in three segments: U.S. Utility, Non-Utility Nuclear, and Energy Commodity Services. The U.S. Utility segment generates, transmits, distributes, and sells electric power. It also operates a small natural gas distribution business. The Non-Utility Nuclear segment owns and operates 5 nuclear power plants in the northeastern United States; and sells the electric power produced by those plants to wholesale customers. It also provides services to other nuclear power plant owners. The Energy Commodity Services segment sells the electric power produced by power plants to wholesale customers. The company owns and operates power plants with approximately 30,000 megawatt of electric generating capacity, and nuclear power generator in the United States. Entergy delivers electricity primarily in Arkansas, Louisiana, Mississippi, and Texas. The company is based in New Orleans, Louisiana.


ENERGY WEST INC (EWST)

Energy West, Incorporated, an energy company, engages in the distribution and sale of natural gas and propane in the United States. The company also engages in the wholesale distribution of bulk propane, as well as in the marketing of gas and electricity. As of June 30, 2005, it distributed natural gas to approximately 33,000 customers through regulated utilities operating in and around Great Falls and West Yellowstone, in Montana, and Cody in Wyoming. The company also distributed propane to approximately 7,900 customers through regulated utilities operating underground vapor systems in and around Payson, Pine, and Strawberry, in Arizona, as well as distributed bulk propane to approximately 2,200 customers in Arizona communities, as of the above date. In addition, it marketed approximately three billion cubic feet of natural gas to commercial and industrial customers in Montana and Wyoming, as of the above date. The company also owns the Shoshone interstate and the Glacier gathering pipeline assets located in Montana and Wyoming. Energy West was incorporated in 1909 and is headquartered in Great Falls, Montana.


EXELON CORPORATION (EXC)

Exelon Corporation, through its subsidiaries, operates as an electric utility company. It has three segments: Energy Delivery, Generation, and Enterprises. The company's energy delivery segment engages principally in the purchase, transmission, distribution, and sale of electricity to residential, commercial, industrial, and wholesale customers in northern Illinois, southeastern Pennsylvania, and Pennsylvania counties. Its Generation segment consists of the owned and contracted for electric generating facilities and energy marketing operations of Exelon Generation Company, LLC; a 50% interest in Sithe Energies, Inc.; and a retail sales business of Exelon Energy Company. Exelon's Enterprise segment engages in the design, installation, and servicing of heating, ventilation, and air conditioning facilities for commercial and industrial customers throughout the midwest. It provides energy-related services, including performance contracting and energy management systems. In addition, it offers retail electric and gas services in Illinois, Massachusetts, Michigan, New Jersey, Ohio, Pennsylvania, and other areas in the midwest and northeast United States; district cooling and related services to offices and other buildings in the central business district of Chicago and in other cities in North America; local and long-distance, point-to-point voice and data communications, internet access, and enhanced data services for businesses and institutions in eastern Pennsylvania. As of August 10, 2004, Exelon distributed electricity to approximately 5.1 million customers in northern Illinois and Pennsylvania; and gas to approximately 460,000 customers in the Philadelphia area. The company was founded in 1887 and is headquartered in Chicago, Illinois.


FIRSTENERGY CORPORATION (FE)

FirstEnergy Corp., through its subsidiaries, provides various energy services in the United States. It engages in the generation, transmission, and distribution of electricity; marketing of natural gas; and energy management and other energy-related services in the United States. The company also provides a range of services, including heating, ventilating, air conditioning, refrigeration, process piping, plumbing, electrical, building controls and systems, and facility management. FirstEnergy builds, operates, and controls telecommunications systems, as well as provides long-distance service, local phone service, and advanced data solutions. As of April 4, 2005, the company served 4.4 million customers within a 36,100 square-mile area of Ohio, Pennsylvania, and New Jersey. FirstEnergy was organized in 1996 and is based in Akron, Ohio.


FPL GROUP INC (FPL)

FPL Group, Inc., through its principal subsidiary, Florida Power & Light Company, engages in the generation, transmission, distribution, and sale of electric energy principally in the state of Florida. The company produces electricity utilizing natural gas, wind, and nuclear resources. It also owns, develops, constructs, manages, and operates domestic electric-generating facilities in wholesale energy markets. FPL Group also provides fiber-optic and cable services to telecommunications companies and other customers throughout Florida. The company primarily serves residential, commercial, and industrial sectors. As of February 28, 2005, it served approximately 4.2 million customer accounts in Florida. FPL Group was incorporated in 1984 and is based in Juno Beach, Florida.


FLORIDA PUBLIC UTILITIES COMPANY (FPU)

Florida Public Utilities Company (FPU) engages in the purchase, transmission, distribution, and sale of electricity in Florida. It also involves in the purchase, transmission, distribution, sale, and transportation of natural gas. FPU sells natural gas and electricity to approximately 80,000 customers in central, northeast, northwest, and southern Florida. The company, through its subsidiary, Flo-Gas Corporation, sells propane gas to approximately 12,000 customers throughout the state of Florida. As of December 31, 2004, it owned 22 miles of electric transmission lines located in northeast Florida; 1,067 miles of electric distribution lines located in northeast and northwest Florida; and distributed gas through 1,481 miles of gas main located in central and south Florida. The company was incorporated in 1924 and is headquartered in West Palm Beach, Florida.


NICOR INC (GAS)

Nicor, Inc., through its subsidiaries, distributes gas in the United States. It also transports containerized freight in the Bahamas and the Caribbean region. The company operates in two segments, Gas Distribution and Shipping. The Gas Distribution segment serves approximately 2.1 million residential, commercial, and industrial customers in northern Illinois. It also provides natural gas storage and transmission-related services to marketers and other gas distribution companies. The Shipping segment transports containerized freight between Florida, the eastern coast of Canada, the Bahamas, and the Caribbean region. This segment also offers cargo insurance coverage to its customers and other third parties. In addition, Nicor markets energy-related products and services, such as heating and air conditioning service and installation, indoor air quality solutions, and protection plans for home appliances to residential and small business consumers in northern Illinois. Nicor is headquartered in Naperville, Illinois.


HAWAIIAN ELECTRIC INDUSTRIES INC (HE)

Hawaiian Electric Industries, Inc. and its subsidiaries engage in electric utility, banking, and other businesses in Hawaii. It engages in the production, purchase, transmission, distribution, and sale of electricity on the islands of Oahu; Maui, Lanai, and Molokai; and Hawaii. The company supplies approximately 93% of the Hawaii electric public utility market that include residential, commercial, and light and power customers. In addition, it provides an array of banking and other financial services to consumers and businesses. As of December 31, 2004, Hawaiian Electric Industries operated a network of 66 branches in Hawaii. The company was incorporated in 1891 and is headquartered in Honolulu, Hawaii.


HUANENG POWER INTL (HNP)

Huaneng Power International, Inc. engages in the generation and sale of electric power in the People's Republic of China. As of March 31, 2005, it owned 16 operating power plants and had controlling interests in 10 operating power companies. Huaneng Power had a total generating capacity of 21,418 MW, as of March 31, 2005. The company is headquartered in Beijing, the People's Republic of China. Huaneng Power International, Inc. is a subsidiary of Huaneng International Power Development Corporation.


IDACORP INC (IDA)

IDACORP, Inc., through its Idaho Power Company (IPC) subsidiary, engages in the generation, purchase, transmission, distribution, and sale of electric energy primarily in southern Idaho and eastern Oregon. The company owns and operates 17 hydroelectric power plants and 1 natural gas-fired plant, as well as shares ownership in 3 coal-fired generating plants. IPC also supplies coal to the Jim Bridger generating plant. As of December 31, 2004, it supplied electric energy to approximately 440,000 general business customers. IDACORP, through its IDACORP Financial Services, Inc. (IFS) subsidiary, holds housing and other real estate investments. IFS's portfolio primarily comprises housing developments in 49 states, Puerto Rico, and the United States Virgin Islands, as well as historic rehabilitation projects, such as the Empire Building in Boise, Idaho. In addition, the company, through its other subsidiaries, develops integrated fuel cell systems; provides integrated telecommunications services, as well as commercial and residential Internet services, including video conferencing, voice-over Internet protocol, offsite training, gigabit Ethernet service, virtual private networks, firewalls, and Web hosting in Boise, Idaho; and Las Vegas and Reno, Nevada. IDACORP is headquartered in Boise, Idaho.


KOREA ELECTRIC POWER CORPORATION (KEP)

Korea Electric Power Corporation engages in the generation, transmission, and distribution of electricity in South Korea. As of December 31, 2004, its transmission system comprised approximately 28,409 circuit kilometers of lines, and distribution system consisted of approximately 380,363 circuit kilometers. The company provides electricity primarily to industrial, commercial, and residential customers, as well as to educational and agricultural customers. Korea Electric Power was founded in 1961 and is headquartered in Seoul, South Korea.


LACLEDE GROUP INC (LG)

The Laclede Group, Inc., through its wholly owned subsidiary, Laclede Gas Company, engages primarily in the distribution of natural gas in Missouri. As of September 30, 2005, the company served approximately 630,000 residential, commercial, and industrial customers in eastern Missouri. Its other wholly owned subsidiary, SM&P Utility Resources, Inc., provides underground locating and marking services for providers of telephone, natural gas, electric, water, cable TV, and fiber optic services. In addition, Laclede Group engages in nonregulated efforts to market natural gas and related activities; operates a propane pipeline that connects the propane storage and vaporization facilities of Laclede Gas to third-party propane supply terminal facilities located in Illinois; involves in the real estate development; and provides insurance products and services for the compression of natural gas to third parties. The company was formed in 1857 as The Laclede Gas Light Company and changed its name to Laclede Gas Company in 1950. Further, it changed its name to The Laclede Group, Inc. in 2001. Laclede Group is based in St. Louis, Missouri.


ALLIANT ENERGY CORPORATION (LNT)

Alliant Energy Corporation operates as the holding company for Interstate Power and Light Company (IPL) and Wisconsin Power and Light Company (WPL). The company engages in the generation, transmission, distribution, and sale of electric energy; and the purchase, distribution, transportation, and sale of natural gas in Iowa, Minnesota, Wisconsin, and Illinois. It also provides steam services in Iowa; water service in Winnebago County, Illinois; and various other energy-related products and services, including construction management services for wind farms. The company owns a portfolio of electric generating facilities with various fuel mixes, including coal, nuclear, natural gas, and renewable resources. As of April 25, 2005, Alliant Energy served approximately three million customers. The company was founded in 1917 and is headquartered in Madison, Wisconsin.


MDU RES GROUP INC (MDU)

MDU Resources Group, Inc. operates as a diversified natural resources company, which provides energy, natural resources products, and related services in the United States. It operates in seven segments: Electric, Natural Gas Distribution (NGD), Utility Services, Pipeline and Energy Services (PES), Natural Gas and Oil Production (NGOP), Construction Materials and Mining (CMM), and Independent Power Production (IPP). The Electric segment generates, transmits, and distributes electricity in Montana, North Dakota, South Dakota, and Wyoming. The NGD segment distributes natural gas in western Minnesota and southeastern North Dakota. The Utility Services segment engages in electrical line construction, pipeline construction, inside electrical wiring and cabling, and the manufacture and distribution of specialty equipments for utilities and manufacturing, commercial, government, and institutional customers. The PES segment provides natural gas transportation, underground storage, and gathering services through regulated and nonregulated pipeline systems primarily in the Rocky Mountain and northern Great Plains regions. It also provides energy-related management services, including cable and pipeline magnetization and location. The NGOP segment engages in the acquisition, exploration, development, and production of natural gas and oil primarily in the Rocky Mountain region and in and around the Gulf of Mexico. The CMM segment mines aggregates and markets crushed stone, sand, gravel, and related construction materials, including ready-mixed concrete, cement, asphalt, and other products. It also performs integrated construction services in the central and western United States and in the states of Alaska and Hawaii. The IPP segment owns, builds, and operates electric generating facilities and has investments in domestic and international natural resource-based projects. MDU Resources was incorporated in 1924 and is based in Bismarck, North Dakota.


METROGAS S.A (MGS)

MetroGAS S.A. distributes natural gas in Argentina. It purchases natural gas primarily from producers in southern and western Argentina and transports through Argentina's two trunk pipeline systems, which are operated by Transportadora de Gas del Sur and Transportadora de Gas del Norte S.A. As of December 31, 2004, the company served approximately 1.9 million residential, industrial, and commercial users; government entities; power plants; and suppliers, dealers, and users of compressed natural gas in the city of Buenos Aires, and southern and eastern greater metropolitan Buenos Aires. As of the same date, its distribution system consisted of approximately 15,840 kilometers of mains. The company was formed in 1992 and is based in Buenos Aires, Argentina.


MIRANT CORP (MIR)

Mirant Corporation produces and sells electricity in the United States and the Caribbean. It also trades and markets energy in the United States. The company's commercial operations primarily consist of procuring fuel, dispatching electricity, hedging the production and sale of electricity by its generating facilities, fuel oil management, and providing logistical support for the operation of its facilities. Its customers include independent system operators, utilities, municipal systems, aggregators, electric cooperative utilities, producers, generators, marketers, and large industrial customers. As of June 22, 2007, Mirant owned or leased approximately 11,350 megawatts of electric generating capacity. The company was founded in 1982 and is headquartered in Atlanta, Georgia.


MIDDLESEX WATER COMPANY (MSEX)

Middlesex Water Company, through its subsidiaries, provides water and wastewater service in New Jersey and Delaware. It owns and operates regulated water utility systems and a regulated wastewater utility, as well as operates water and wastewater systems on behalf of others in New Jersey and Delaware. Middlesex Water provides retail water service to approximately 58,000 customers in Woodbridge, Edison, South Plainfield, Carteret, Metuchen, and South Amboy, as well as offers service under contract to Sayreville, the Old Bridge Municipal Utilities Authority (MUA), the Marlboro MUA, East Brunswick, Edison, and Highland Park. The company was founded in 1896 and is headquartered in Iselin, New Jersey.


MARKWEST HYDROCARBON INC (MWP)

MarkWest Hydrocarbon, Inc. owns a limited partnership interest in MarkWest Energy Partners, L.P., which engages in the gathering, processing, and transmission of natural gas; transportation, fractionation, and storage of natural gas liquids; and the gathering and transportation of crude oil. The company also markets natural gas and natural gas liquids. It provides its services primarily in Appalachia, Michigan, east Texas, western Oklahoma, and other areas of the southwest. The company was founded in 1988 and is headquartered in Englewood, Colorado.


NATIONAL FUEL GAS COMPANY (NFG)

National Fuel Gas Company, through its subsidiaries, operates as a diversified energy company. The company operates in five segments: Utility, Pipeline and Storage, Exploration and Production, Energy Marketing, and Timber. The Utility segment sells natural gas to approximately 731,000 customers in Buffalo, Niagara Falls, and Jamestown in New York, and Erie and Sharon in Pennsylvania through a distribution system in western New York and northwestern Pennsylvania. The Pipeline and Storage segment provides interstate natural gas transportation and storage services for affiliated and nonaffiliated companies through an integrated gas pipeline system and 28 underground natural gas storage fields. This segment also transports natural gas for utilities, large industrial customers, and power producers in New York through a 157-mile pipeline that extends from the United States/Canadian border at the Niagara River near Buffalo to near Syracuse in New York. The Exploration and Production segment explores for, and develops and purchases natural gas and oil reserves in California, Appalachian region of the United States, Gulf Coast region of Texas, Louisiana, provinces of Alberta, and Saskatchewan and British Columbia in Canada. The Energy Marketing segment markets natural gas to industrial, commercial, public authority, and residential end-users in western and central New York, and northwestern Pennsylvania. The Timber segment markets timber, owns sawmills, and processes timber primarily of hardwoods. As of September 30, 2005, the company had U.S. and Canadian reserves of 60,257 Mbbl of oil and 238,140 MMcf of natural gas. As of the above date it owned and managed approximately 100,000 acres of timber property. National Fuel Gas was incorporated in 1902 and is based in Williamsville, New York.


NATIONAL GRID TRANSCO PLC (NGG)

National Grid plc, a utility company, engages in the transmission and distribution of electricity and gas in the United Kingdom and the United States. It owners and operates gas and electricity transmission and gas distribution networks in the United Kingdom and the United States, and electricity distribution networks in the United States. The company owns and operates the high-voltage electricity system in England and Wales, and the high pressure gas transmission system in Britain. It also owns electricity transmission systems in the northeastern U.S. and manages a range of electricity transmission operations for utilities in the U.S. Midwest. National Grid had a gas transmission network comprised of approximately 4,300 miles of high pressure national transmission pipelines; the U.K. gas distribution system of approximately 82,000 miles of distribution pipelines; the U.S. electricity transmission systems of approximately 14,000 circuit miles of transmission and subtransmission lines; and the U.S. electricity and gas distribution systems of approximately 72,000 circuit miles of electric distribution lines located on rights-of-way in New England and New York, and approximately 8,500 miles of gas distribution pipelines located on rights-of-way in New York, as of March 31, 2005. National Grid distributes electricity in the northeastern U.S. to approximately 3.3 million customers and gas in upstate New York to approximately 565,000 customers. In addition, it provides infrastructure and related services in areas, such as wireless network infrastructure for broadcast and mobile telephones, metering, grain liquefied natural gas import, interconnectors, and property. The company was formerly known as National Grid Transco plc and changed its name to National Grid plc in July 2005. National Grid plc is based in London.


NORTHERN INDIANA PUBLIC SERVICE COMPANY (NI)

NiSource, Inc., through its subsidiaries, provides natural gas, electricity, and other products and services to customers located within a corridor that runs from the Gulf Coast through the Midwest to New England. It operates in four segments: Gas Distribution Operations, Gas Transmission and Storage Operations, Electric Operations, and Other Operations. The Gas Distribution Operations segment provides natural gas to residential, commercial, and industrial customers in Ohio, Pennsylvania, Virginia, Kentucky, and Maryland. It also distributes natural gas to customers in northern Indiana, Massachusetts, Maine, and New Hampshire. The Gas Transmission and Storage Operations segment owns and operates interstate pipelines and underground natural gas storage systems with a capacity of storing approximately 646 billion cubic feet of natural gas. The Electric Operations segment generates and distributes electricity to northern part of Indiana, as well as engages in wholesale and wheeling transactions. The Other Operations segment offers energy-related services, including gas marketing, power trading, and ventures focused on distributed power generation technologies, including a cogeneration facility, fuel cells, and storage systems. It also engages in real estate and other businesses. The company was founded in 1912. It was formerly known as NIPSCO Industries, Inc. and changed its name to NiSource, Inc. in 1999. NiSource is headquartered in Merrillville, Indiana.


NEWJERSEY RESOURCES CORPORATION (NJR)

New Jersey Resources Corporation, an energy services holding company, provides retail and wholesale energy services primarily in New Jersey. It provides regulated retail natural gas service to residential and commercial customers in central and northern New Jersey. As of September 30, 2005, the company served approximately 462,000 customers. It also provides unregulated wholesale energy services, including base load natural gas, and peaking and balancing services, as well as provides asset management services to customers in states from the Gulf Coast and Mid-Continent to New England, and Canada. In addition, the company involves in the sale, installation, and servicing of appliances, as well as holds and develops commercial real estate, consisting of approximately 126 acres of undeveloped land in Monmouth and Atlantic counties. Its customers for the wholesale energy services include local distribution companies, industrial companies, electric generators, and retail aggregators. New Jersey Resources Corporation was formed in 1922 and is based in Wall, New Jersey.


NRG ENERGY INC (NRG)

NRG Energy, Inc. primarily engages in the ownership and operation of power generation facilities and the sale of energy, capacity, and related products in the United States and internationally. The company generates power through natural gas, coal, and oil fired facilities. It also trades energy, capacity, and related products. In addition, NRG Energy owns district heating and cooling systems. As of December 31, 2004, the company owned interests in 52 power projects in 5 countries having an aggregate net generation capacity of approximately 15,400 mega watts. NRG Energy was founded in 1989 and is headquartered in Princeton, New Jersey.


NSTAR (NST)

NSTAR, a holding company, engages in the transmission and distribution of energy principally in Massachusetts. The company primarily transports electricity and natural gas. As of January 19, 2005, it served approximately 1.4 million customers in eastern and central Massachusetts, including 1.1 million electric distribution customers in 81 communities, and 300,000 natural gas distribution customers in 51 communities. The company also conducts nonutility, unregulated operations, such as liquefied natural gas service and telecommunications. NSTAR was founded in 1886 and is based in Boston, Massachusetts.


NORTHEAST UTILITIES (NU)

Northeast Utilities, through its subsidiaries, engages in the retail and wholesale marketing of electricity and natural gas, as well as in the provision of energy-related services to government, industrial, commercial, and institutional facilities in the northeast United States. The company provides retail electric supply in Connecticut, Delaware, Maryland, New Jersey, Maine, Pennsylvania, Virginia, New York, Massachusetts, Rhode Island, and New Hampshire. It also manages, operates, maintains, and supports electric power generating equipment, facilities, and associated transmission and distribution equipment, as well as provides turnkey management and operation services to owners of electric generation facilities. The company provides consulting services to its customers, including due diligence reviews, environmental regulatory compliance, permitting services, and laboratory analyses. It also maintains and services fossil and hydroelectric facilities, and provides high-voltage electrical contracting services. Northeast Utilities is based in Springfield, Massachusetts.


NORTHWEST NATURAL GAS COMPANY (NWN)

Northwest Natural Gas Company, doing business as NW Natural, principally distributes natural gas in Oregon and southwest Washington. NW Natural also engages in the provision of natural gas storage and transportation services to interstate customers. The company, through its subsidiary, NNG Financial Corporation, holds financial investments, including limited partnership interests in two wind power electric generation projects located in California and in two low-income housing projects in Portland, Oregon. The company served 537,152 residential customers, 58,548 commercial customers, and 935 industrial customers, as of the above date. NW Natural's natural gas distribution system consists of 12,925 miles of distribution and transmission mains. Northwest Natural Gas Company was incorporated in 1910 and is headquartered in Portland, Oregon.


OGE ENERGY CORPORATION (OGE)

OGE Energy Corp. operates as an energy and energy services provider that offers delivery and management of electricity and natural gas primarily in the south central United States. The company, through its subsidiary, Oklahoma Gas and Electric Company, engages in the generation, transmission, distribution, and sale of electric energy in Oklahoma and western Arkansas. OGE Energy, through Enogex, Inc., engages in the transportation, storage, gathering, processing, and marketing of natural gas. As of December 31, 2004, the company provided electricity to approximately 1.9 million customers and operated approximately 8,200 miles of intrastate gas gathering and transportation pipelines. OGE Energy was incorporated in 1995 and is based in Oklahoma City, Oklahoma.


ONEOK INC (OKE)

ONEOK, Inc. operates as a diversified energy company primarily in the mid-continent areas of the United States. The company operates in five segments: Production, Gathering and Processing, Transportation and Storage, Distribution, and Energy Services. The Production segment produces natural gas and oil in Oklahoma and in Texas. The company owns interest in approximately 885 gas wells and 90 oil wells, as of December 31, 2004. The Gathering and Processing segment gathers, processes, and markets natural gas and fractionates; and stores and markets natural gas liquids (NGL) primarily in Oklahoma, Kansas, and Texas. The Transportation and Storage segment provides natural gas transportation, storage, and nonprocessable gas gathering services. It owns approximately 5,600 miles of intrastate pipeline and 59.6 Billon cubic feet of storage facility. The Distribution segment provides natural gas distribution services to approximately 2 million customers in Kansas, Oklahoma, and Texas, as of December 31, 2004. The Energy Services segment engages in marketing and trading natural gas to both retail and wholesale customers in the United States and Canada. It also owns a 300 megawatt gas-fired merchant power plant, and markets and trades power. The company was founded in 1906 and is headquartered in Tulsa, Oklahoma.


OTTER TAIL CORPORATION (OTTR)

Otter Tail Corporation operates as a diversified company with interests in the electric, health services, manufacturing, plastics, and other businesses. The company operates in five segments: Electric, Plastics, Manufacturing, Health Services, and Other Business Operations. The Electric segment produces, transmits, distributes, and sells electric energy. It provides electricity to approximately 128,000 customers, including agricultural, residential, commercial, and industrial customers in Minnesota, North Dakota, and South Dakota. The Plastics segment produces polyvinyl chloride and polyethylene pipes for municipal water, rural water, wastewater, and other uses in the United States and Canada. It sells its products primarily to wholesalers and distributors throughout through independent sales representatives, company salespersons, and customer service representatives. The Manufacturing segment produces waterfront equipment, wind towers, frame-straightening equipment, and accessories for the auto body shop industry; material and handling trays and horticultural containers; fabrication of steel products; contract machining; and metal parts stamping and fabrication. The Health Services segment sells diagnostic medical equipment, patient monitoring equipment, and related supplies and accessories. It also provides service maintenance, diagnostic imaging, positron emission tomography and nuclear medicine imaging, and portable X-ray imaging, as well as rental of diagnostic medical imaging equipment. The Other Business Operations segment consists of businesses involved in food ingredient processing; residential, commercial, and industrial electric contracting industries; fiber optic and electric distribution systems; wastewater, water, and HVAC systems construction; transportation; and energy services and natural gas marketing. Otter Tail was established in 1907 and is headquartered in Fergus Falls, Minnesota.


PACIFIC GAS & ELECTRIC CO (PCG)

PG&E Corporation, a holding company, engages in the generation, procurement, and transmission of electricity, as well as procurement, transportation, and storage of natural gas in the United States. The company served approximately 4.9 million electricity distribution customers and approximately 4.1 million natural gas distribution customers, as of December 31, 2004. It also owned 18,610 circuit miles of interconnected transmission lines, as of the above date. In addition, the company owns and operates an integrated natural gas transportation, storage, and distribution system, as well as three underground natural gas storage fields in California. PG&E Corporation was incorporated in 1995 and is headquartered in San Francisco, California.


PUBLIC SERVICE ENTERPRISE GROUP INCORPORATED (PEG)

Public Service Enterprise Group Incorporated operates as the utility holding company for Public Service Electric and Gas Company (PSE&G), PSEG Power LLC (PSEG Power), and PSEG Energy Holdings LLC (Energy Holdings). PSE&G engages in the transmission, distribution, and sale of electric energy and gas service to commercial, residential, and industrial customers in New Jersey. It also offers appliance services and repairs to its customers. As of December 31, 2004, PSE&G provided services to approximately 2.1 million electric customers and approximately 1.7 million gas customers. PSEG Power operates as a multiregional, independent wholesale energy supply company primarily in the northeast United States. It integrates its generating asset operations with its wholesale energy, fuel supply, energy trading, and marketing and risk management functions. PSEG Power's generation portfolio comprised approximately 14,607 MW of installed capacity, as of the above date. Energy Holdings, through its subsidiaries, operates as a power producer and distributor that owns and operates electric generation and distribution facilities primarily in North America, Europe, and the Middle East. It also invests in energy-related financial transactions and manages a portfolio of assets, including leveraged leases, operating leases, leveraged buyout funds, limited partnerships, and marketable securities. Public Service Enterprise Group was formed in 1985 and is headquartered in Newark, New Jersey.


PROGRESS ENERGY INC (PGN)

Progress Energy, Inc. operates as an integrated energy company primarily in the southeast region of the United States. It operates through Progress Energy Carolinas Electric (PEC Electric), Progress Energy Florida (PEF), Competitive Commercial Operations (CCO), Fuels, and Synthetic Fuels segments. The PEC Electric segment and PEF segment are primarily engaged in the generation, transmission, distribution, and sale of electric energy in portions of North Carolina and South Carolina, and Florida, respectively. These electric operations also distribute and sell electricity to other utilities, primarily on the east coast of the United States. The CCO segment engages in nonregulated electric generation operations and marketing activities primarily in Georgia, North Carolina, and Florida. The Fuels segment primarily engages in natural gas production in Texas and Louisiana; and coal mining, coal terminal services, and fuel transportation and delivery in Kentucky, West Virginia, and Virginia. The Synthetic Fuels segment engages in the production and sale of synthetic fuels, and the operation of synthetic fuel facilities for outside parties in Kentucky, West Virginia, and Virginia. The company had approximately 24,000 megawatts of electric generation capacity and serves approximately 2.9 million retail electric customers, as of December 31, 2004. Progress Energy, formerly known as CP&L Energy, Inc., was founded in 1925 and is headquartered in Raleigh, North Carolina.


PNM RESOURCES INC (HOLDING CO.) (PNM)

PNM Resources, Inc., through its subsidiaries, engages in the energy and energy-related businesses. It primarily engages in the generation, transmission, distribution, sale, and marketing of electricity. The company also transmits, distributes, and sells natural gas in the state of New Mexico. It distributes electricity for retail electric customers in New Mexico, as well as for third parties. The company's gas services include distribution of natural gas to both sales-service customers and transportation-service customers. In addition, the company provides energy and technology-related services. As of June 6, 2005, PNM Resources served approximately 1.2 million customers, including 725,000 electric customers in Texas and New Mexico and 471,000 natural gas customers in New Mexico. The company is headquartered in Albuquerque, New Mexico.


PENNICHUCK CORPORATION (PNNW)

Pennichuck Corporation, through its subsidiaries, engages in the collection, storage, treatment, and distribution of potable water for domestic, industrial, commercial, and fire protection service in southern and central New Hampshire. It operates in three segments: Regulated Water Utility Operations, Nonregulated Water Management Services, and Real Estate Operations. The Water Utility segment provides potable water facilities for domestic, industrial, commercial, and fire protection services. The Nonregulated Water Management Services segment offers nonregulated, water-related monitoring, maintenance, testing, and compliance reporting services for water systems for various towns, businesses, and residential communities primarily in southern and central New Hampshire. This segment also provides contract operations and maintenance, water testing, and billing services to municipalities and small, privately owned community water systems. The Real Estate segment involves in the ownership, planning, development, management, and sale of residential, commercial, industrial, and retail properties. Pennichuck was founded in 1852 and is headquartered in Merrimack, New Hampshire.


PINNACLE WEST CAPITAL CORPORATION (PNW)

Pinnacle West Capital Corporation, through its subsidiaries, provides energy and energy-related products primarily in Arizona. It engages in the generation, transmission, and distribution of electricity in the western United States. The company provides commodity-related energy services, such as direct access commodity contracts, energy procurement, and energy supply consultation; and energy-related products and services, such as energy master planning, energy use consultation and facility audits, cogeneration analysis, and installation and project management to commercial, industrial, and institutional retail customers in the western United States. In addition, Pinnacle West develops residential, commercial, and industrial real estate projects in Arizona, Idaho, New Mexico, and Utah. Its assets consist primarily of land with improvements, commercial buildings, golf courses, and other real estate investments. Further, the company invests in companies offering energy-related technologies and services. Pinnacle West was founded in 1920 and is headquartered in Phoenix, Arizona.


PIEDMONT NATURAL GAS COMPANY INC (PNY)

Piedmont Natural Gas Company, Inc., an energy services company, primarily distributes natural gas to residential, commercial, and industrial customers in North Carolina, South Carolina, and Tennessee. It distributed natural gas to approximately 960,000 customers, as of January 17, 2005. The company also sells residential and commercial gas appliances in Tennessee. In addition, the company, through its subsidiaries, invests in joint venture energy-related businesses, including unregulated retail natural gas marketing, interstate natural gas storage, intrastate natural gas transportation, and regulated natural gas distribution. Piedmont Natural Gas Company was founded in 1949 and is headquartered in Charlotte, North Carolina.


POTOMAC ELECTRIC POWER COMPANY (POM)

Pepco Holdings, Inc., through its subsidiaries, operates as a diversified energy company. It engages in two principal businesses, electricity and natural gas delivery (Power Delivery); and competitive energy generation, marketing, and supply (Competitive Energy). The Power Delivery business consists of the transmission and distribution of electricity, and the distribution of natural gas in all or parts of Delaware, Maryland, New Jersey, Ohio, Pennsylvania, Virginia, West Virginia, and the District of Columbia. As of December 31, 2004, the company delivered electricity to approximately 1.8 million customers in the mid-Atlantic region, and distributed natural gas to approximately 118,000 customers in Delaware. The Competitive Energy business provides competitive generation, marketing, and supply of electricity and gas, and related energy management services, primarily in the mid-Atlantic region. It offers wholesale electric power, capacity, and ancillary services in the wholesale markets, and supplies electricity to other wholesale market participants under long-term bilateral contracts. The company also sells natural gas and fuel oil to end-users and to wholesale market participants, as well as retail electricity and natural gas to residential, commercial, industrial, and governmental customers. In addition, Competitive Energy provides integrated energy management services, including energy-efficiency contracting, development and construction of green power facilities, central plant and other equipment operation and maintenance, fuel management, and home service agreements for residential customers. Further, it offers high voltage construction and maintenance services to utilities and other customers throughout the United States; and low voltage electric and telecommunication construction, and maintenance services in the Washington, D.C. area. Pepco Holdings was founded in 1896 and is headquartered in Washington, D.C.


PPL CORPORATION (PPL)

PPL Corporation, an energy and utility holding company, primarily engages in the generation, sale, and delivery of electricity. The company generates electricity and markets wholesale or retail energy primarily in the northeastern and western United States; delivers electricity to approximately five million customers in Pennsylvania, the United Kingdom, and Latin America; and provides energy services for businesses in the mid-Atlantic and northeastern United States. PPL Corporation was founded in 1920 and is headquartered in Allentown, Pennsylvania.


CITIGROUP GLOBAL MARKETS (PSC)

No description available.


PUGET SOUND ENERGY (PSD)

Puget Energy, Inc., an energy services holding company, engages in the transmission, distribution, and generation of electric energy, as well as transmission and distribution of natural gas primarily in Washington. The company also provides infrastructure construction services to the electric and gas utility industries in the United States. It offers various services to the electric utility industry, which include overhead and underground power line and cable construction, installation, and maintenance, including high-voltage transmission and distribution lines, copper, and fiber optic cables; duct installation; revitalization and damage prevention for underground power lines and cables using the patented Cablecure treatment; substation construction; and other specialty services for new and existing infrastructures. Its services to the gas utility industry include large-diameter pipeline installation and maintenance; service lines and meters; conventional river crossings and bridge maintenance; and cathodic protection. Puget Energy also offers power station fabrication and installation; vacuum excavation; hydrostatic testing; internal pipeline inspection; product pipelines; and other specialty services for distribution and transmission pipeline services, including small, mid-size, and large-bore directional drilling for various pipeline diameters and soil conditions. As of December 31, 2004, the company had approximately 1,001,200 electric customers and approximately 672,000 gas customers. Puget Energy was founded in 1912 and is headquartered in Bellevue, Washington.


RGC RESOURCES INC (RGCO)

RGC Resources, Inc., through its subsidiaries, engages in the distribution and sale of natural gas in Virginia. It distributes to residential, commercial, and large industrial users through underground mains and services. As of September 30, 2005, the company had approximately 1,140 miles of transmission and distribution pipeline to serve the 59,000 customers. RGC Resources, Inc. was founded in 1912 and is based in Roanoke, Virginia.


REGIS CORPORATION (RGS)

Regis Corporation engages in the ownership, operation, and franchising of hair and retail product salons, and beauty career schools worldwide. It also provides hair restoration services, such as hair loss solutions. The company operated 10,879 system-wide North American and international salons, 24 beauty career schools, and 90 hair restoration centers, as of June 30, 2005. The salons offer a range of custom styling, cutting, hair coloring, waving, and waxing services, as well as professional hair care products. The company's worldwide operations include salon concepts, such as Supercuts, Jean Louis David, Vidal Sassoon, Regis Salons, MasterCuts, Trade Secret, SmartStyle, and Cost Cutters. Its North American operations include 8,861 salons in the United States, Canada, and Puerto Rico. The company's international operations include 2,018 salons located in Europe, primarily in the United Kingdom, France, Italy, and Spain. Regis was formed in 1954 and is headquartered in Edina, Minnesota.


SCANA CORPORATION (SCG)

SCANA Corporation engages in the generation and sale of electricity, as well as in the purchase, sale, and transportation of natural gas to wholesale and retail customers in South and North Carolina, and Georgia. The company also engages in other energy-related businesses, holds investments in telecommunications companies, and provides fiber optic communications. Its electric service area extends into 24 counties covering approximately 15,000 square miles. The company owns liquefied natural gas liquefaction and storage facilities. SCANA transports natural gas to residential, commercial, and industrial customers. It owns and operates approximately 500 mile fiber optic telecommunications network and data center facilities, and provides Ethernet services, as well as engages in tower site construction, management, and rental services. The company also provides homeowners with service contracts on their home appliances, and heating and air conditioning units. SCANA Corporation was founded in 1924 and is headquartered in Columbia, South Carolina.


SEMCO ENERGY INC (SEN)

SEMCO Energy, Inc. operates as a regulated public utility company in the United States. It operates through two segments, Gas Distribution and Other. The Gas Distribution segment purchases, transports, distributes, and sells natural gas to residential, commercial, and industrial customers. It distributes and transports natural gas to approximately 280,000 customers in Michigan and approximately 118,000 customers in Alaska. The Other segment primarily includes operations in information technology (IT) services, propane distribution, intrastate natural gas pipelines, and natural gas storage facilities. The IT services operation provides IT services with a focus on mid-range computers, particularly the IBM I-Series platform. The company's propane distribution operation sells approximately 4 million gallons of propane annually to retail customers in Michigan's Upper Peninsula and northeast Wisconsin. Its pipeline and storage operations operate natural gas transmission and storage facilities in Michigan. The company is headquartered in Port Huron, Michigan.


SOUTH JERSEY INDUSTRIES INC (SJI)

South Jersey Industries, Inc., through its wholly owned subsidiaries, provides various energy services and products. The company, through its subsidiary, South Jersey Gas Company, distributes natural gas in seven southernmost counties of New Jersey. It also sells natural gas and pipeline transportation capacity to various customers on the interstate pipeline system; transports natural gas; and provides appliance service and installation. The company also acquires and markets natural gas and electricity to retail-end users, and provides energy management services to commercial and industrial customers. South Jersey Industries, through its other subsidiaries, offers wholesale natural gas storage, commodity, and transportation in the mid Atlantic and southern states, as well as develops and operates energy related projects and installs residential and small commercial HVAC systems in southern New Jersey. South Jersey Industries was founded in 1910 and is headquartered in Folsom, New Jersey.


SJW CORPORATION (SJW)

SJW Corp., a holding company, operates through three subsidiaries: San Jose Water Company (SJWC), SJW Land Company, and Crystal Choice Water Service LLC (CCWS). SJWC engages in the production, purchase, storage, purification, distribution, and retail sale of water in Cupertino, San Jose, Campbell, Monte Sereno, Saratoga, and the Town of Los Gatos in California. SJWC also provides nonregulated water related services, such as water system operations, billings, and cash remittances under agreements with municipalities. SJW Land owns and operates a 750-space surface parking facility in San Jose, California, as well as owns commercial properties and undeveloped land in the San Jose Metropolitan area; properties in Florida and Connecticut; and a 70% limited partnership interest in 444 West Santa Clara Street, L.P. CCWS, a 75% owned subsidiary, sells and rents water conditioning and purification equipment in the metropolitan San Jose area. The company was founded in 1866 and is headquartered in San Jose, California.


SOUTHERN COMPANY (SO)

The Southern Company, through its subsidiaries, primarily engages in the generation, transmission, distribution, and supply of electricity in the states of Alabama, Georgia, Florida, Mississippi, and Georgia. The company's retail activities are carried out by Southern Power Company, Alabama Power Company, Georgia Power Company, Gulf Power Company, Mississippi Power Company, and Savannah Electric and Power Company. Its other business activities include investments in synthetic fuels and leveraged lease projects, wireless telecommunication services, energy-related services, and natural gas marketing. The company serves approximately 4 million customers, as of April 26, 2005. Southern Company was incorporated in 1945 and is headquartered in Atlanta, Georgia.


SEMPRA ENERGY (SRE)

Sempra Energy, an energy services holding company, provides electric, natural gas, broadband, and related products and services in the United States. It operates through four segments: Southern California Gas Company (SoCalGas), San Diego Gas & Electric (SDG&E), Sempra Commodities, and Sempra Generation. SoCalGas segment provides natural gas storage services for use by the core, noncore, and off-system customers in California. SDG&E segment provides electric service to San Diego and southern Orange counties, and natural gas service to San Diego County. Sempra Commodities segment is a trading company that markets and trades physical and financial commodity products. Its trading portfolios consist of physical and financial commodity contracts, including contracts for natural gas, electricity, petroleum products, base metals, and other commodities. Sempra Generation segment primarily acquires, develops, and operates power plants. It also provides energy services and facilities management, and owns mineral rights in properties that produce petroleum and natural gas. As of December 31, 2004, this segment operated power plants in California, Arizona, Texas, Nevada, and Mexico with a capacity of 3,670 Megawatts. As of March 8, 2005, the company served approximately 19.2 million natural gas customers and 3.3 million electricity customers. Its customers include core customers, such as residential, and small commercial and industrial customers; noncore customers, such as electric generation, wholesale, industrial, and oil recovery customers. Sempra Energy was founded in 1886 and is headquartered in San Diego, California.


SIERRA PACIFIC RESOURCES (SRP)

Sierra Pacific Resources (SPR) operates as the holding company for Nevada Power Company (NPC) and Sierra Pacific Power Company (SPPC). The company, through NPC, engages in the distribution, transmission, generation, and sale of electric energy in Clark County in southern Nevada. NPC provided electricity to approximately 738,000 customers in the communities of Las Vegas, north Las Vegas, Henderson, Searchlight, Laughlin, and adjoining areas, including Nellis air force base, as of December 31, 2004. NPC also provides services to the Department of Energy's Nevada test site in Nye County. SPPC provided electricity to approximately 342,600 customers in an approximately 50,000 square mile service area in western, central, and northeastern Nevada, including the cities of Reno, Sparks, Carson, and Elko; and a portion of eastern California, including the Lake Tahoe area, as of December 31, 2004. SPPC also distributed natural gas in Nevada to approximately 134,800 customers in an area of approximately 600 square miles in Reno/Sparks and environs, as of the above date. In addition, the company, through a partnership, operates an interstate natural gas pipeline from Malin, Oregon to Reno, Nevada. Sierra Pacific Resources is headquartered in Reno, Nevada.


QUESTAR CORPORATION (STR)

Questar Corporation and its subsidiaries operate as a natural gas-focused energy company. It operates through its three subsidiaries: Questar Market Resources, Inc.; Questar Pipeline Company; and Questar Gas Company. The Questar Market Resources engages in gas and oil exploration, development, and production; gas gathering and processing; wholesale gas and oil marketing; and gas storage. The Questar Pipeline provides interstate natural gas transmission, storage, and gas-processing and treating services. As of December 31, 2005, it owned and operated approximately 488-mile line that extended from the Blanco hub in the San Juan Basin to the California state line serving approximately 794,117 sales and transportation customers. The Questar Gas distributes natural gas as a public utility in Utah, southwestern Wyoming, and a small portion of southeastern Idaho. As of above date, the company had 1,434 billion cubic feet of proved natural gas reserves. It primarily operates in Rocky Mountain region of Wyoming, Utah, and Colorado; and the Midcontinent region of Oklahoma, Texas, and Louisiana. The company was founded in 1922 and is headquartered in Salt Lake City, Utah.


SOUTHERN UNION COMPANY (SUG)

Southern Union Company, through its subsidiaries, engages in the transportation, storage, and distribution of natural gas in the United States. The company distributes natural gas to approximately 962,000 residential, commercial, and industrial customers through local distribution systems consisting of 14,326 miles of mains; 9,654 miles of service lines; and 78 miles of transmission lines, as of December 31, 2004. It primarily serves customers in Missouri, Pennsylvania, Rhode Island, and Massachusetts. The company also engages in the interstate transportation and storage of natural gas in the midwest and southwest regions, as well as provides liquefied natural gas terminalling and regasification services. It operates approximately 10,000 miles of interstate pipelines, as of the above date. Southern Union Company was incorporated in 1932 and is headquartered in Wilkes-Barre, Pennsylvania.


SOUTHWESTERN ENERGY COMPANY (SWN)

Southwestern Energy Company, together with its subsidiaries, operates as an integrated energy company primarily focused on the exploration for and production of natural gas, principally in Arkansas, Oklahoma, Texas, New Mexico, and Louisiana. The company operates in three segments: Exploration and Production, Natural Gas Distribution, and Marketing. In the Exploration and Production segment, the company explores, develops, and produces natural gas and crude oil. Its portfolio includes development drilling in the Arkoma Basin and East Texas, exploration and exploitation properties in the Permian Basin of Texas and New Mexico, and in Louisiana and East Texas. As of December 31, 2004, the company's estimated proved natural gas and oil reserves were 64505billion cubic feet equivalent of gas. In the Natural Gas Distribution segment, the company's Arkansas Western Gas Company, distributes and transmits natural gas to approximately 145,000 retail customers. In the Marketing segment, the company undertakes marketing of gas production and third party natural gas that is primarily sold to industrial customers. Southwestern Energy Company was organized in 1929 and is headquartered in Houston, Texas.


SOUTHWEST WATER COMPANY (SWWC)

Southwest Water Company and its subsidiaries provide water production, treatment, and distribution; wastewater collection and treatment; utility billing and collection; utility infrastructure construction management; and public works services in the United States. The company operates in two groups, Services and Utility. The Services group provides water and wastewater facility operations and maintenance services, equipment maintenance and repair, sewer pipeline cleaning, billing and collection services, and state-certified water and wastewater laboratory analysis on a contract basis. The facilities it operates are owned by cities, public agencies, municipal utility districts, and private entities primarily in Alabama, California, Colorado, Georgia, Mississippi, New Jersey, New Mexico, South Dakota, and Texas. This group also facilitates the design, construction, project management, and operating aspects of various water and wastewater projects, as well as provides utility billing and collections services for multiple family housing units, such as apartment buildings. The Utility group owns and operates rate-regulated public water utilities in California, New Mexico, Oklahoma, and Texas, as well as owns wastewater facilities in New Mexico and Texas. Southwest Water was incorporated in 1954 and is headquartered in Los Angeles, California.


SOUTHWEST GAS CORPORATION (SWX)

Southwest Gas Corporation operates in the natural gas transmission and construction businesses. The company purchases, transports, and distributes natural gas in Arizona, Nevada, and California. As of March 31, 2005, it provided natural gas to approximately 1,632,000 residential, commercial, industrial, and other customers. The company, through its subsidiary, Northern Pipeline Construction Co., provides utility companies with trenching and installation, replacement, and maintenance services for energy distribution systems. Southwest Gas Corporation was founded in 1931 and is headquartered in Las Vegas, Nevada.


TECO ENERGY INC (TE)

TECO Energy, Inc., through its subsidiaries, engages in the regulated utilities and other unregulated businesses. The company provides retail electric service to approximately 625,000 customers in west central Florida. It purchases and distributes natural gas for residential, commercial, industrial, and electric power generation customers in Florida. The company has interests in mineral rights. It owns or operates surface and underground mines, synthetic fuel production facilities, and coal processing and loading facilities in eastern Kentucky, Tennessee, and southwestern Virginia. The company also has interests in independent power projects in Virginia, Arkansas, Mississippi, and Arizona. In addition, TECO Energy provides waterborne transportation, storage, and transfer services of coal, and other dry-bulk commodities. TECO Energy was founded in 1899 and is headquartered in Tampa, Florida.


TRANSPORTADORA DE GAS DEL SUR SA TGS (TGS)

Transportadora de Gas Del Sur S.A. engages in the transportation of natural gas, and production and commercialization of natural gas liquids in Argentina. It operates a pipeline system of 7,419 km (4,610 miles). The company also involves in the midstream activities, which include the separation and removal of impurities, such as water, carbon dioxide, and sulfur from the natural gas stream. It offers gas transportation service to distribution companies, power plants, and industries; and provides services related to pipeline construction, inspection, and maintenance. In addition, the company provides telecommunication services to telecommunication operators and corporate customers, through its wholly owned subsidiary, TELCOSUR S.A. The company was incorporated in 1992 and is headquartered in Buenos Aires, Argentina.


TRANSCANANDA PIPELINES LTD (TRP)

TransCanada Corporation operates as an energy company. It primarily engages in the natural gas transmission and power generation in the United States and Canada. The company's Gas Transmission segment includes the operation of the wholly owned Canadian Mainline, Alberta System, Foothills System, BC System, GTN System, and North Baja System, as well as the company's other investments in partially owned natural gas pipelines and storage facilities located primarily in Canada and the United States. In addition, this segment investigates and develops new natural gas transmission, natural gas storage, and liquefied natural gas regasification facilities in Canada and the U.S. TransCanada's Power segment engages in the acquisition, development, construction, ownership, operation, and management of power plants; marketing of electricity; and the provision of electricity account services to energy and industrial customers. It also holds the company's investments in other electrical power generation plants. TransCanada owns, controls, or constructs approximately 5,700 megawatts of power generation. The company was founded in 1951 and is headquartered in Calgary, Canada.


UGI CORPORATION (UGI)

UGI Corporation, through its subsidiaries, engages in the distribution and marketing of energy products and related services. The company operates in five segments: AmeriGas Propane, International Propane, Gas Utility, Electric Utility, and Energy Services. The AmeriGas Propane segment distributes propane; sells, installs, and services heating systems; and installs and services propane fuel systems for motor vehicles. This segment serves residential, commercial, agricultural, motor fuel, wholesale, and industrial users in the United States and Canada. The International Propane segment distributes liquid petroleum gas (LPG) for space heating, cooking, water heating, process heat, and transportation; and wholesales LPG. It also provides logistic, storage, and other services to third-party LPG distributors. This segment serves residential, commercial, agricultural, and motor fuel customers in Europe. The Gas Utility segment distributes natural gas in eastern and southeastern Pennsylvania counties through gas mains to residential, commercial, and industrial customers. The Electric Utility segment supplies electric service in portions of Luzerne and Wyoming Counties in northeastern Pennsylvania through transmission and distribution lines and transmission substations to residential, commercial, and industrial customers. The Energy Services segment sells natural gas directly to commercial and industrial customers in Pennsylvania, New Jersey, Delaware, Maryland, Virginia, New York, Ohio, North Carolina, and the District of Columbia through transportation systems; fuel oil, electricity, and LPG to commercial and industrial customers in Pennsylvania, New Jersey and Maryland; and propane. It also generates electricity. The company also provides heating, ventilation, air-conditioning, refrigeration, and electrical contracting services to residential, commercial, industrial, and new construction markets. UGI was founded in 1882 and is based in King of Prussia, Pennsylvania.


UIL HOLDINGS CORPORATION (UIL)

UIL Holdings Corporation provides electricity and related services, electrical contracting, and voice-data-video systems integration services in the United States. It operates in two segments Utility and Electrical Contracting. The Utility segment engages in the purchase, transmission, distribution, and sale of electricity for residential, commercial, and industrial purposes. It offers its services to approximately 320,000 customers in urban and suburban areas of New Haven and Bridgeport. The Electrical Contracting segment provides electrical, mechanical, and voice-data-video design, construction, and related services. Its services include designing, building, maintaining, and servicing electrical data communications and utilities systems. Its electrical contracting services include design of the electrical distribution systems within a building; procurement and installation of wiring and connection to power sources and end-use equipment; and contract maintenance. Its mechanical contracting services include the design, procurement, and installation of systems for heating, ventilation, air conditioning, and refrigeration; room ventilation systems; and plumbing, process, and fire protection piping systems. The Electrical Contracting segment offers its services to contractors, property managers and developers, corporations, government agencies and municipalities, utilities, gaming facilities, and homeowners. It also provides computer network systems integration services, which include design, installation, management, and support of various network needs, including point-to-point data and communications installations, and wide area data and communication networks. It offers these services to healthcare and educational facilities, as well as to technology, financial services, and pharmaceutical companies. In addition, UIL Holdings owns and operates two heating and cooling energy centers. The company was founded in 1899 and is headquartered in New Haven, Connecticut.


UNISOURCE ENERGY CORPORATION (UNS)

UniSource Energy Corporation, through its subsidiaries, operates as an electric utility in Arizona. It conducts its business in four segments: TEP's Electric Utility, UNS Gas, UNS Electric, and Global Solar. The TEP's Electric Utility segment provides regulated electric service to the community of Tucson, Arizona. It also sells electricity to other utilities and power marketing entities in the western United States. TEP serves various industries, including copper mining, cement manufacturing, defense, health care, education, military bases, and other governmental entities. The UNS Gas segment distributes gas to residential customers. It serves approximately 133,000 retail customers in Mohave, Yavapai, Coconino, and Navajo Counties in northern Arizona, as well as Santa Cruz County in southeast Arizona. This segment also provides natural gas transportation services. The UNS Electric segment engages in the transmission and distribution of electric power primarily to residential, small commercial, and light and heavy industrial customers. It serves approximately 85,000 retail customers in Mohave and Santa Cruz counties, Arizona. In addition, UNS Electric owns and operates the Valencia Power Plant that consists of three gas and diesel-fueled combustion turbine units located in Nogales, Arizona. The Global Solar segment develops and manufactures light weight thin-film photovoltaic cells and panels for military, space, and commercial applications. The company also invests in unregulated businesses, including a developer of thin-film batteries; and a provider of electrical contracting services in Arizona to commercial, industrial, and governmental customers in high voltage and inside wiring capacities, and meter reading services. UniSource Energy was founded in 1902 and is headquartered in Tucson, Arizona.


UNITIL CORPORATION (UTL)

Unitil Corporation, a public utility holding company, engages in the retail distribution of electricity in the southeastern seacoast and capital city areas of New Hampshire. It also distributes electricity and natural gas in the greater Fitchburg area of north central Massachusetts. As of December 31, 2004, the company served approximately 97,500 electric customers and 15,000 natural gas customers. Unitil Corporation, through its subsidiaries, Usource, Inc. and Usource L.L.C., provides energy brokering and advisory services to commercial and industrial customers in the northeastern United States. The company was founded in 1901 and is based in Hampton, New Hampshire.


VECTREN CORPORATION (VVC)

Vectren Corporation operates as an energy and applied technology holding company in the United States. It has two groups, Utility and Nonregulated. The Utility group consists of the operations of the gas utility services, electric utility services, and other operations that provide information technology and other support services. Gas utility services include natural gas distribution and transportation services to residential, commercial, industrial, and other customers in Indiana and west central Ohio. As of December 31, 2004, the Utility group supplied natural gas service to 980,000 customers. Its electricity utility services comprise electric generation, transmission, and distribution services primarily to southwestern Indiana. The Utility group supplied electric service to 135,098 customers, as of the above date. The principal industries served in this group include automotive assembly, parts and accessories, feed, flour and grain processing, metal castings, aluminum products, appliance manufacturing, polycarbonate resin and plastic products, gypsum products, and electrical equipment. The Nonregulated group comprises four business areas: energy marketing and services, coal mining, utility infrastructure services, and broadband. The energy marketing and services area provides natural gas and fuel supply management services to municipalities, utilities, industrial operations, schools, and healthcare institutions. Coal mining area engages in the mining and sale of coal. Utility infrastructure services area provide underground construction and repair of utility infrastructure services to gas, water, and telecommunications companies, as well as facilities locating and meter reading services. Broadband area provides broadband services, such as cable television, Internet, and local and long distance phone services primarily to the greater Evansville, Indiana area. Vectren Corporation was founded in 1912 and is headquartered in Evansville, Indiana.


WISCONSIN ENERGY CORPORATION (WEC)

Wisconsin Energy Corporation, through its subsidiaries, provides electric and natural gas service to customers in Wisconsin and Michigan. It operates in two segments, Utility Energy and Nonutility Energy. The Utility Energy segment serves approximately 1,081,400 electric customers in Wisconsin and the upper peninsula of Michigan; approximately 437,800 gas customers in Wisconsin; and approximately 460 steam customers in metro Milwaukee, Wisconsin. It also serves water customers in suburban Milwaukee, Wisconsin. The Nonutility Energy segment designs, permits, builds, and owns power plants in Wisconsin Energy's electric utility service areas. It also involves in the development and marketing of renewable energy and recycling technologies. In addition, the company develops and invests in real estate. The company was incorporated in 1981 and is headquartered in Milwaukee, Wisconsin.


WASHINGTON GAS LIGHT COMPANY (WGL)

WGL Holdings, Inc., through its subsidiaries, engages in the sale and delivery of natural gas, and energy-related products and services in Washington, District of Columbia; Maryland; and Virginia. It operates in three segments: Regulated Utility, Retail Energy-Marketing, and Commercial HVAC. The Regulated Utility segment delivers natural gas to retail customers. The Retail Energy-Marketing segment sells natural gas and electricity to residential, commercial, and industrial natural gas customers. The Commercial HVAC segment focuses on retrofitting the mechanical, electrical, and energy-related systems of commercial and government structures. WGL Holdings was incorporated in 1848 and is headquartered in Washington, District of Columbia.


WPS RESOURCES CORPORATION (WPS)

WPS Resources Corporation operates as the holding company for regulated utility and nonregulated business units. The company supplies and distributes electric power and natural gas in its franchised service territory in northeastern Wisconsin and an adjacent portion of the upper peninsula of Michigan. It also provides wholesale electric service to various customers, including municipal utilities, electric cooperatives, energy marketers, other investor owned utilities, and a municipal joint action agency. The company also offers nonregulated natural gas, electric, and alternate fuel supplies, as well as energy management and consulting services, to retail and wholesale customers primarily in the northeastern quadrant of the United States and adjacent portions of Canada. WPS Resources was founded in 1883 and is based in Green Bay, Wisconsin.


WESTAR ENERGY INC (WR)

Westar Energy, Inc. engages in the generation, transmission, and distribution of electricity in Kansas. The company provides electricity to residential, commercial, and industrial customers in the cities of Topeka, Lawrence, Manhattan, Salina, Hutchinson, and Wichita. It generated 5844 Megawatts of electricity and owned approximately 6100 miles of transmission lines, 23,600 miles of overhead distribution lines, and 3,300 miles of underground distribution lines, as of June 30, 2005. Westar Energy served approximately 659,000 customers, as of the above date. It also supplies electric energy at wholesale to the electric distribution systems of 54 cities in Kansas and 4 electric co-operatives that serve rural areas of Kansas. In addition, the company engages in energy marketing, and purchase and sale of wholesale electricity. Westar Energy was incorporated in 1924 and is headquartered in Topeka, Kansas.


XCEL ENERGY INC (XEL)

Xcel Energy, Inc., through its subsidiaries, operates as an electrical and natural gas company in the United States. Its activities include generation, purchase, transmission, distribution, and sale of electricity. The company also purchases, transports, and distributes natural gas to retail customers; and transports customer-owned natural gas. Xcel Energy serves customers in portions of Colorado, Kansas, Michigan, Minnesota, New Mexico, North Dakota, Oklahoma, South Dakota, Texas, and Wisconsin. As of December 31, 2004, it provided electricity services to approximately 3.3 million customers; and natural gas services to approximately 1.8 million customers in the United States. Xcel Energy was incorporated in 1909 and is based in Minneapolis, Minnesota.


YORK WATER COMPANY (YORW)

The York Water Company engages in the impounding, purification, and distribution of water in York County, Pennsylvania. The company has two reservoirs, Lake Williams and Lake Redman, which together hold up to 2.23 billion gallons of water. It supplies water for domestic, commercial, industrial, and fire protection purposes. As of December 31, 2004, the company served approximately 158,000 people in 33 municipalities within York County. As of the above date, its distribution system had approximately 784 miles of main water lines. The York Water Company was organized in 1816 and is based in York, Pennsylvania.