OGE Energy is the holding company for the largest electric utility in Oklahoma, but its largest revenue producer is its energy marketing and natural gas transmission unit, OGE Energy Resources. OGE owns Oklahoma Gas and Electric (OG&E), a public utility with almost 777,000 retail and wholesale customers in Oklahoma (including Oklahoma City) and a bit of western Arkansas. OG&E owns coal- and gas-fired power plants that generate 6,420 MW of capacity. Subsidiary Enogex operates 7,900 miles of natural gas gathering and transportation pipeline. The company also provides physical, asset, financial management services through marketing unit OGE Eenergy Resources.

Staying true to its more-than-a-century-old watery origins, Turlock Irrigation District (TID) provides irrigation services to almost 6,000 farmers in its service area (150,000 acres of farmland). The company also provides electric generation, transmission, and distribution services to more than 98,000 retail customers in and around Turlock, California, and it sells power to wholesale customers. TID became a generator and distributor of electricity in 1923. The district provides electric service to its customer base in a 662-sq.-ml. service area encompassing portions of Merced, Stanislaus, and Tuolumne counties.

Southern California Edison (SCE) distributes electricity to a population of more than 13 million people in central, coastal, and Southern California (excluding Los Angeles and some other cities in the regions). The utility's system consists of about 12,000 circuit miles of transmission lines and more than 113,500 circuit miles of distribution lines. SCE also has 5,500 MW of net generating capacity from interests in nuclear, hydroelectric, and fossil-fueled power plants; it sold most of its fossil-fueled facilities in response to the state's deregulation legislation. The utility sells excess power to wholesale customers. SCE is a subsidiary of Edison International.

Horizon Wind Energy owns and operates more than 20 onshore wind farms across nine states that have a generating capacity of 2,800 MW. It has another 20,000 MW of wind projects in various stages of development around the country. Horizon sells its electricity wholesale as Power Purchase Agreements (PPAs) to utility companies such as AmerenUE, Direct Energy, Great River, and the TVA. It has also developed and sold seven farms to Entergy, Florida Power & Light, and Puget Energy.

Privatization is the light at the end of the tunnel for Companhia Energetica de Sao Paulo, one of Brazil's largest power generators. Known as CESP, the company is the largest generator of electricity used in the Brazilian state of Sao Paulo. CESP's six hydroelectric facilities (57 generation units) have a capacity of more than 7,456 MW. It gets most of its revenues from distribution utilities. Sao Paulo state government-controlled CESP previously had 22 power plants, but it spun off two generating companies and a transmission company in 1999. The slimmer CESP was targeted for auction, but the state government postponed the sale. CESP is restructuring its debt and is focusing on operational efficiency.

Wolverine Power Supply Cooperative makes sure that that voracious consumer of electricity -- the American public -- gets the power its needs. The non-profit company is an electric generation and transmission utility that provides services to five member distribution cooperatives in Michigan. Wolverine Power Supply Cooperative monitors and operates 1,600 miles of bulk transmission lines and owns five power plants that generate 200 megawatts of capacity. It also maintains about 130 distribution substations and 36 transmission stations, as well as purchases power (including windpower energy) from other utilities and marketers to distribute to its customers.

STP Nuclear Operating Company (STPNOC) is pulling out all the stops to make sure that the lights burn brightly in the Lone Star State. The company manages the South Texas Project Electric Generating Station on a 12,220-acre site near Bay City, Texas. The nuclear power plant's two reactors, which went into operation in 1988 and in 1989, produce about 2,700 MW of electricity and serve 2 million homes in Texas. The company is jointly owned by NRG Energy (44%), CPS Energy (40%), and Austin Energy (16%). STPNOC accounts for about 7.5% of the power consumed in Texas.

Atmos Energy Corporation, together with its subsidiaries, engages primarily in the distribution, transmission, and storage of natural gas in the United States. The company operates in four segments: Natural Gas Distribution; Regulated Transmission and Storage; Natural Gas Marketing; and Pipeline, Storage, and Other. The Natural Gas Distribution segment involves in regulated natural gas distribution business and related sales operations. It distributes natural gas through regulated sales and transportation arrangements to approximately 3 million residential, commercial, public authority, and industrial customers in 12 states located primarily in the southern United States. As of September 30, 2009, this segment owned approximately 70,879 miles of underground distribution and transmission mains. The Regulated Transmission and Storage segment transports natural gas for third parties and manages five underground storage reservoirs in Texas. It owned 5,950 miles of gas transmission and gathering lines. The Natural Gas Marketing segment provides various natural gas management and marketing services to municipalities, other local gas distribution companies, and industrial customers. The Pipeline, Storage, and Other segment offers natural gas gathering, transmission, and storage services. It owned 113 miles of gas transmission and gathering lines. Atmos Energy Corporation was founded in 1906 and is headquartered in Dallas, Texas.

Electricity Supply Board (ESB) is a leading electricity utility in Ireland, providing electricity generation, distribution, and supply. The state-owned company has several divisions that operate independently in the electricity market. Its ESB Power Generation unit operates 13 power stations in Ireland. Its generation plants have an installed capacity of more than 4,650 MW and serve a customer base of about 2 million. The group's ESB Networks owns the high-voltage transmission network and other distribution systems. ESB International develops power projects, including renewable energy plants worldwide; the company has installed 77 MW of wind farms in Ireland, and in 2010 acquired a 35 MW wind farm in Wales.

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 New Hampshire and Massachusetts. The company also provides non-regulated water management services, including monitoring, maintenance, testing, and compliance reporting services for water systems of various towns, businesses, and residential communities. In addition, Pennichuck Corporation involves in real estate management and commercialization activities. The company was founded in 1852 and is headquartered in Merrimack, New Hampshire.

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