Renegy Holdings (formerly Catalytica Energy Systems) was formed in the 2007 merger of Catalytica with the renewable energy divisions of NZ Legacy, a land and energy development firm. Among other ventures, Renegy has built a biomass power generation plant near Snowflake, Arizona, that came online in 2008. The company has long-term power purchasing agreements in place with Arizona Public Service and Salt River Project to buy biomass electricity from the Snowflake White Mountain Power plant. To save costs, in 2009 Renegy delisted its stock from the NASDAQ exchange.

Northeast Utilities (NU) uses a little Yankee ingenuity (and a number of power generation plants) to keep its customers powered up. The largest utility in New England, NU supplies power to more than 2 million customers in Connecticut, New Hampshire, and Massachusetts through subsidiaries Connecticut Light and Power, Public Service Company of New Hampshire, and Western Massachusetts Electric. The company's power grid encompasses more than 3,100 circuit miles of overhead transmission lines and more than 32,800 pole miles of distribution lines. NU's Yankee Gas utility provides natural gas to 205,000 customers in Connecticut. In 2010 the company offered to buy regional rival NSTAR in for $4.2 billion.

Southern Nuclear Operating company, a subsidiary of Southern Company since 1990, operates six nuclear power units at three plant locations, which combined, provide about 20% of the electricity used in Alabama and Georgia. Southern Nuclear's Joseph M. Farley Nuclear Plant began commercial operation in 1977. The Edwin I. Hatch Nuclear Plant and the Alvin W. Vogtle Electric Generating Plant are jointly owned by Southern Company's Georgia Power (50%), Oglethorpe Power (30%), the Municipal Electrical Authority of Georgia (18%), and the city of Dalton.

Deriving its name from an old Eskimo tribal word, Chugach Electric Association generates, transmits, distributes, and sells electricity in Alaska's railbelt region. This area extends from the coastal Chugach Mountains into central Alaska and includes the state's two largest cities (Anchorage and Fairbanks). The member-owned cooperative utility has 530 MW of generating capacity from its natural gas-fired and hydroelectric power plants. Serving 80,300 metered retail locations, Chugach Electric, the largest electric utility in Alaska, also sells wholesale power to other municipal and cooperative utilities in the region.

New York Independent System Operator (New York ISO). The company, which replaced the New York Power Pool, manages and monitors wholesale activities on the state's transmission grid, which consists of some 11,000 miles of high-voltage lines. The New York ISO is charged with providing fair access to the state's competitive wholesale power market (37,400 MW of generating capacity), while ensuring the reliable, efficient, and safe delivery of power to New York's more than 19 million residents. The not-for-profit company is governed by a 10-person board of directors.

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.

National Thermal Power Corporation (NTPC), thankfully generates enough electricity to run a lot of air conditioners. State-run NTPC, which generates almost 29% of India's power supply, has 22 coal and gas-fired power plants and interests in four more through its SAIL Power Supply joint venture. The company's plants (including joint ventures) have a combined capacity of more than 30,240 MW and feed distribution grids throughout India; prices are determined by India's Electricity Act. NTPC also offers global power consulting and engineering and construction services. India's government owns nearly 90% of NTPC.

The York Water Company engages in impounding, purifying, and distributing drinking water in Pennsylvania. It owns and operates two reservoirs, Lake Williams and Lake Redman, which together holds approximately 2.2 billion gallons of water. The company also has a 15-mile pipeline from the Susquehanna River to Lake Redman that provides access to an additional supply of 12.0 million gallons of water per day. As of December 31, 2009, it served approximately 180,000 residential, commercial, industrial, and other customers in 39 municipalities in York County and 7 municipalities in Adams County. The company was founded in 1816 and is based in York, Pennsylvania.

Clean water is the goal of H2O Innovation. For amusement parks, campgrounds, cities, schools, zoos, and other enterprises, H2O Innovation uses micro filtration, ultra filtration, nanofiltration, and reverse osmosis to create drinking water, as well as clean water for manufacturing and other purposes. H2O Innovations also treats wastewater, offers equipment for the maple syrup industry, and desalinates seawater and brackish water. In 2007 it became the first North American company to be listed on the Alternext (Euronext) Exchange in Paris. By 2008 the company had installed more than 400 systems in Canada, the US, and elsewhere.

Connexus Energy connects more Minnesotans to electricity than any other cooperative. The member-operated organization distributes power to more than 123,000 customers in the northern suburbs of Minneapolis-St. Paul. Connexus buys its power from generation and transmission cooperative Great River Energy and distributes it through more than 9,050 miles of power line. It also operates 43 electrical substations. Residential customers account for the bulk of sales in a territory that comprises parts of Anoka, Chisago, Hennepin, Isanti, Ramsey, Sherburne, and Washington counties.

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