The main tenet of TenneT's business is to keep the Dutch national power transmission grid running smoothly across the nation's high-voltage power lines, constantly balancing supply with demand. The state-owned company also provides inspection and maintenance services for the infrastructure. TenneT manages more than 2,040 miles of high-voltage transmission lines and more than 50 electrical substations. Subsidiary APX manages non-contracted wholesale energy transactions. In 2010 TenneT spent $1.1 billion to buy grid operator transpower from E.ON. In 2010 a TenneT and National Grid joint venture began laying the first section of a high-voltage cable to connect the power grids in the Netherlands and the UK.

RGC Resources, Inc., together with its subsidiaries, operates as an energy services company. It primarily engages in the regulated sale and distribution of natural gas in Virginia. RGC Resources, Inc. also provides non regulated services to its customers. It distributes natural gas to residential, commercial, and industrial users through underground mains and service lines. As of September 30, 2009, RGC Resources, Inc. had approximately 1,034 miles of transmission and distribution pipeline serving 56,119 customers. RGC Resources, Inc. was founded in 1912 and is based in Roanoke, Virginia.

Pennsylvania-American Water Company distributes water and provides wastewater services to a population of more than 2 million people in more than 370 communities across Pennsylvania. Pennsylvania-American Water also operates some 35 water treatment plants, seven wastewater facilities, and 9,900 miles of pipeline. The company's service territory covers some 35 Pennsylvania counties. Pennsylvania-American Water, the largest regulated water and wastewater service provider in Pennsylvania, is a subsidiary of the New Jersey-based American Water.

Owensboro, Kentucky (named after Abraham Owen, a Shelby County legislator killed in the Battle of Tippecanoe) is served by Owensboro Municipal Utilities, which provides power to almost 26,000 customers and water to 24,500. The city-owned utility operates water treatment facilities and a power plant that uses coal and used tires for fuel. Its operating divisions are Elmer Smith power plant, Engineering & Operations, Water Production, and Customer Service Center. It also offers telecommunications services. Owensboro Municipal Utilities is overseen by the five-member Owensboro Utility Commission, which is appointed by the mayor of Owensboro.

Central Vermont Public Service Corporation, together with its subsidiaries, operates as an electric utility company. The company engages in the purchase, production, transmission, distribution, and sale of electricity. It sells electricity to residential, commercial, and industrial customers. As of December 31, 2009, the company served approximately 159,000 retail customers in Vermont. Its wholly owned plants included 20 hydroelectric generating facilities with an aggregate nameplate capacity of 45.3 megawatts; and 2 oil-fired gas turbines with a combined nameplate capacity of 26.5 megawatts. The company also owns, buys, sells, and leases real and personal property and interests therein related to the utility business; and sells and rents electric water heaters in Vermont and New Hampshire. In addition, it has joint ownership interests in electric generating and transmission facilities. The company was founded in 1929 and is based in Rutland, Vermont.

Snam Rete Gas (formerly Snam S.p.A.) transmits natural gas across Italy, managing a network of about 19,300 miles of transmission pipeline. The network includes eight regional centers, 55 local management centers, and 11 compressor stations, and transports more than 83 billion cubic meters of natural gas a year. The company is also the only liquefied natural gas (LNG) regasification and storage services provider in Italy (operating through subsidiary GNL Italia). Energy behemoth Eni controls Snam Rete Gas, which was formed in 2001. In 2009 Eni consolidated its gas units, and sold its Italgas gas distributor and its Stogit gas storage unit to Snam Rete.

Energen Corporation, an energy holding company, engages in the acquisition, exploration, development, and production of oil, natural gas, and natural gas liquids in the continental United States. It also involves in the purchase, distribution, and sale of natural gas to residential, commercial, and industrial customers, as well as other end-users of natural gas in central and north Alabama. In addition, the company provides gas transportation services for industrial and commercial customers located on its distribution system. As of December 31, 2009, Energen Corporation had proved oil and gas reserves of 1,547 billion cubic feet equivalent in the San Juan Basin in New Mexico and Colorado, the Permian Basin in west Texas, and the Black Warrior Basin in Alabama. Energen Corporation was founded in 1929 and is headquartered in Birmingham, Alabama.

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.

Shell International Renewables (doing business as Shell Renewables) may be able to turn them into fuel to power homes and vehicles. The company oversees many of the parent Royal Dutch Shell's operations in alternative fuels, was formed in 1997 to commercially explore the global possibilities of new low-carbon power systems. Shell Renewables markets and distributes alternative energies from the sun, the wind, hydrogen (technically an energy carrier rather than energy source), and bio-fuels worldwide. It is researching hydrogen created from natural gas and bio-fuels, made of everything from corn to algae, to replace gasoline in cars.

Piedmont Municipal Power Agency (Piedmont Power) generates, purchases, and transmits wholesale electricity on behalf of its 10 member municipal utilities, which distribute the power to nearly 95,000 retail customers in northwestern South Carolina. These ten utilities serve the cities of Abbeville, Clinton, Easley, Gaffney, Greer, Laurens, Newberry, Rock Hill, Union, and Westminster. Piedmont Power was created to buy an ownership interest in the Catawba Nuclear Station in York County, South Carolina, in order to secure a reliable source of electric generation for its member utilities.The agency currently owns a 25% stake in the Catawba plant.

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