Pinnacle West Capital is at the peak of the energy pyramid in Arizona. It is the holding company for the state's largest electric utility, Arizona Public Service (APS), which transmits and distributes electricity to 1.1 million residential, commercial, and industrial customers throughout most of the state. The utility also has more than 6,280 MW of generating capacity. Through APS and other subsidiaries, Pinnacle West markets wholesale and retail power in Arizona and the western US. The company also develops and manages real estate and invests in energy ventures.

The dryly named electric utility Electric Power Development Co. has a much more fun nickname -- J-POWER. With a generating capacity of 16,380 MW, the company supplies power used all over Japan. It has 67 hydroelectric plants, as well as some thermal and geothermal plants, and owns a transmission network that covers 2,400 km. J-POWER acts as a wholesale electric utility, selling to other electric power companies. Established by the Japanese government in 1952, J-POWER went through the privatization process, finally achieving full privatization and trading on the Tokyo Stock Exchange in 2004. The company is also sometimes referred to as EPDC.

RPG Enterprises has more than 20 companies that span energy, retail, manufacturing, technology, and entertainment. The company's primary operations include electricity generation and distribution (through CESC Limited and Noida Power) and utility and telecommunications infrastructure development, as well as carbon black production and tire manufacturing. Other operations include supermarkets (Spencer's Hypermarket), retail music and health and beauty stores, software, telecommunications, pharmaceuticals, and music recording businesses. RPG Enterprises is controlled by the Goenka family; the company was formed in 1979 to hold the family's diversified business interests.

WPPI Energy (formerly Wisconsin Public Power) generates, purchases, and supplies wholesale electricity to 51 municipal distribution utilities, which in turn serve more than 192,000 homes and businesses in Wisconsin, Upper Michigan and Iowa. Founded as a political subdivision of the State of Wisconsin, the utility was formed by its member-owners (the municipalities) in 1980. WPPI Energy has interests in power plants that give it a capacity of more than 1,120 MW. It also engages in wholesale energy transactions with other regional utilities and energy marketers and is a major advocate of green energy power resources.

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.

This Springfield is not Homer Simpson's hometown, or Abe Lincoln's. City Utilities of Springfield, Missouri supplies electricity, natural gas, and water for residents and businesses in the southwestern Missouri town. The utility, which has about 1,970 miles of power lines and 1,300 miles of natural gas mains, serves about 106,560 electric customers, more than 82,220 natural gas customers, and more than 76,600 water customers. It also operates the municipal bus system, which has 25 regular street buses and five demand/response buses. City Utilities of Springfield has a service region of 320 sq. ml. and serves a base population of 229,000.

Not-for-profit holding company Glas Cymru owns Dwr Cymru Welsh Water, one of the largest regulated water and sewerage companies in the UK. Welsh Water distributes water and provides wastewater services to 1.3 million household customers and more than 100,00 business customers in Wales and England. It has a network of about 560 service reservoirs. The company supplies 850 million liters of drinking water daily through its 27,000-km network of water mains. Its sewer system includes 19,000-km of sewers and more than 800 wastewater-treatment works. Formed in 2000, Glas Cymru bought Welsh Water from Western Power Distribution in 2001. Western Power Distribution had acquired Hyder, Welsh Water's parent, in 2000.

Compressco Partners puts the pressure on before the natural gas and oil wells run dry. The company specializes in providing services to more than 400 natural gas and oil companies across 14 states to increase production and total recoverable reserves. The company offers compression, liquids separation, and gas metering services, as well as the GasJack units that perform these operations. It applies its services primarily to mature wells, but also on newer wells, which have declined in production. Compressco Partners, a subsidiary of TETRA Technologies, also provides well evaluations and well testing and monitoring services in Mexico.

Public Works Commission of the City of Fayetteville, North Carolina (PWC), which is responsible for operating, maintaining, and upgrading the municipal electric, water, and wastewater utility systems. PWC distributes electricity and water to more than 78,000 residential, commercial, and industrial customers. The electric utility has about 930 miles of underground power lines, 24,100 distribution line transformers and more than 47,160 poles. The water utility has 1,260 miles of mains; the wastewater unit, 1,180 miles of sewer line.

Phoenix Natural Gas is the largest gas distribution business in Northern Ireland, being the owner and operator of the licence for the distribution network in the Greater Belfast Area and Larne. The distribution business is responsible for the development of the pipeline network and also for providing a 24/7 operational and transportation service platform to gas suppliers under the rules of the company's network code.The Phoenix network currently extends to 2,940 kilometres of intermediate, medium and low pressure mains, which distribute natural gas throughout the licence area, representing around 50% of the population of Northern Ireland. Phoenix Natural Gas manages the development of the both the physical network and market in Greater Belfast; already some 123,000 customers have been connected to natural gas in the 12 years it has been available to them. The business is regulated under licence by the Northern Ireland Authority for Utility Regulation (NIAUR).

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