WGL Holdings, Inc. engages in the delivery and sale of natural gas, and provides energy-related products and services in the District of Columbia, Maryland, Virginia, and Delaware. WGL Holdings, Inc. operates through three segments: Regulated Utility, Retail Energy-Marketing, and Design-Build Energy Systems. The Regulated Utility segment delivers natural gas to retail customers, as well as sells natural gas to customers who have not elected to purchase natural gas from unregulated third-party marketers. The Retail Energy-Marketing segment sells natural gas and electricity directly to residential, commercial, and industrial customers. As of September 30, 2009, it served approximately 151,000 residential, commercial, and industrial natural gas customers, and 113,000 electricity customers. The Design-Build Energy Systems segment focuses on upgrading the mechanical, electrical, water, and energy-related systems of government and commercial facilities by implementing traditional, as well as alternative energy technologies. WGL Holdings, Inc. was founded in 1848 and is headquartered in Washington, District of Columbia.

Middle Tennessee Electric Membership Corporation's service territory is smack dab in the middle of Tennessee. The utility company distributes electricity to about 180,000 residential and business customers (member/owners) in four counties (Cannon, Rutherford, Williamson, and Wilson), via 10,000 miles of power lines connected to about 30 electric distribution substations. Middle Tennessee Electric purchases its power supply from the Tennessee Valley Authority. The corporation is Tennessee's largest electric cooperative and the sixth largest in the US.

ALLETE provides light to the northern climes. Most of its business is classified within its regulated operations, which include electric, gas, and water utilities located in northeastern Minnesota and northwestern Wisconsin. Those operations are conducted through subsidiaries Minnesota Power (about 145,000 customers) and Superior Water, Light and Power (about 35,000 customers for its electric, gas, and water utilities). ALLETE's other segment includes coal mining operations, emerging technologies related to electric utilities, and a real estate business (large land tracts in Florida). Subsidiary BNI Coal operates a mine in North Dakota that supplies, primarily, two generating co-ops, Minnkota Power and Square Butte.

In 1976 the cooperative changed its name from Colquitt County Rural Electric Company to Colquitt EMC. The utility is the largest EMC in south Georgia with some of the lowest electric rates in the state.There's no quit in the electric service to Colquitt and surrounding counties in Georgia, thanks to Colquitt Electric Membership Corporation (Colquitt EMC). The consumer-owned non-profit utility distributes electricity to more than 41,000 members in Berrien, Brooks, Colquitt, Cook, Lowndes, Tift, and Worth counties. Colquitt EMC distributes electricity via more than 8,020 miles of power line.

CMS Energy Corporation, through its subsidiaries, operates as an energy company primarily in Michigan. It operates in three segments: Electric Utility, Gas Utility, and Enterprises. The Electric Utility segment engages in the generation, purchase, distribution, and sale of electricity. The Gas Utility segment involves in the purchase, transmission, storage, distribution, and sale of natural gas. The Enterprises segment engages in independent power production and marketing. This segment owns power generation facilities fueled mostly by natural gas and biomass. At December 31, 2009, this segment had ownership interests in independent power plants totaling 1,202 gross Megawatt. The company serves individuals and companies operating in the alternative energy, automotive, chemical, metal, food products, and various other industries. As of December 31, 2009, it served 1.8 million electric customers and 1.7 million gas customers. The company was founded in 1987 and is based in Jackson, Michigan.

Salt River Project (SRP) provides Phoenix with two types of currents: electric and water. Electricity comes from the Salt River Project Agricultural Improvement and Power District, a political subdivision of the State of Arizona that has a generating capacity of about 8,100 MW and distributes power to about 934,000 homes and businesses. The district also sells excess power to wholesale customers. Water comes from the Salt River Valley Water Users' Association, a private firm that delivers almost 1 million acre-feet of water per year to residents and agricultural irrigators; the association also operates dams, canals, reservoirs, and wells in its service area.

Hokkaido Electric Power Co. (HEPCO) distributes electricity to almost 3.9 million residential, commercial, and industrial customers on the northernmost Japanese island, Hokkaido. The company operates more than 46,760 miles of transmission and distribution lines, and it owns thermal, hydroelectric, and nuclear power plants (including the No. 1 and No. 2 reactors at Tomari Power Station). HEPCO also purchases and markets wholesale energy; other operations include engineering and construction, energy consulting, electrical appliance sales, telecommunications, information technology, and utility-related services. New businesses include medical imaging systems and realty. The company was founded in 1951.

Allegheny Energy, Inc. owns and operates electric generation facilities, and delivers electric services to customers in Pennsylvania, West Virginia, Maryland, and Virginia. The company owns or contractually controls coal-, gas-, and oil-fired generation facilities, as well as hydro generation facilities. It operates in two segments, The Merchant Generation and The Regulated Operations. The Merchant Generation segment owns, operates, and manages electric generation facilities, as well as purchases and sells energy and energy-related commodities. This segment markets its electric generation capacity to various customers and markets, including certain of its affiliates, as well as uses both derivative and nonderivative contracts to manage its portfolio of contracts. As of December 31, 2009, it owned or contractually controlled 7,015 megawatts of generation capacity. The Regulated Operations segment operates electric public utility systems that include electricity generation, transmission, and distribution facilities. As of December 31, 2009, it owned or contractually controlled 2,741 megawatts of generation capacity. This segment served approximately 383,600 customers in northern West Virginia; approximately 483,400 customers in portions of West Virginia, Maryland, and Virginia; approximately 102,000 customers in northern Virginia; and approximately 714,900 customers in southwestern, south-central, and northern Pennsylvania. The company is headquartered in Greensburg, Pennsylvania.

Puerto Rico Electric Power Authority (PREPA) is prepared to serve an entire island nation. Founded in 1941, the government-owned utility is the sole electricity distributor for Puerto Rico, where it serves approximately 1.4 million residential and business customers. PREPA owns five primarily fossil-fueled power plants that give it nearly 5,800 MW of generating capacity, and it has more than 30,000 miles of transmission and distribution lines. In order to keep up with increasing demand, the Puerto Rican government has allowed independent power producers to build cogeneration plants on the island to sell power to PREPA.

Techem knows when the heat is on. The company is a leading European utility services firm (with operations in 20 countries) that monitors energy and water consumption in 8 million end-user households, primarily apartments and multi-family dwellings in Germany. It also offers its 690,000 clients additional services such as heat and water meter sales and rentals, heating system maintenance, and bill collection. Techem Energy Contracting builds and operates facilities for energy supply, and the company's IT division offers property management software.

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