Exelon Corporation company distributes electricity to 5.4 million customers in northern Illinois (including Chicago) and southeastern Pennsylvania (including Philadelphia) through subsidiaries Commonwealth Edison (ComEd) and PECO Energy. PECO also distributes natural gas to 485,000 customers. Subsidiary Exelon Generation holds the company's power plants, whose production capacity is just about 25,000 MW. About two-thirds of Generation's power is nuclear. Exelon Power Team is a top wholesale energy marketer, and Exelon Energy markets retail power and offers other energy-related services.

PG&E Corporation is well on the way to fully recharging its batteries after losing power and declaring bankruptcy following California's energy crisis and the ensuing collapse of the wholesale energy trading industry. Its venerable Pacific Gas and Electric utility serves approximately 5.1 million electric customers and 4.3 million natural gas customers in California. The utility (founded in 1905) is also engaged in electricity generation; procurement and transmission; and natural gas procurement, transportation, and storage. In September 2010 a PG&E utility gas transmission line ruptured in San Bruno, causing a major fire, loss of life, and destruction of, or damage to, about 170 homes.

Global Water Resources (GWRI) took the phrase "Think globally, act locally" to heart. The company provides water, wastewater, and recycled water utility services to 14 utilities and more than 60,000 people in its service area around Phoenix. Its recycled water is treated and purified wastewater used for non-potable and outdoor purposes, sent through a separate system of pipes than drinking water. GWRI says its reclaimed water project saves up to 40% of drought-prone Arizona's scarce groundwater. The utility also extends water and wastewater infrastructure financing to regional developers and builders. The company was formed in 2003. Once privately held, GWRI went public in an IPO in late 2010.

Massive power resource, Massachusetts Municipal Wholesale Electric Company (MMWEC) provides power supply services to its members -- 23 of the state's 40 municipal utilities (28 utilities are also participants in MMWEC power supply projects). The power supplier has about 715 MW of generating capacity from interests in fossil-fueled and nuclear power plants in the northeastern US, and it negotiates bulk electricity purchases from other generators for its members. MMWEC is the operator and principal owner of the Stony Brook Energy Center, a 520 MW, combined-cycle intermediate and peaking generating station in Ludlow, Massachusetts.

Southern Californians soak up the sun, and the energy. The latter is where Southern California Public Power Authority comes in. The power authority generates and transmits electricity for 10 municipal distribution utilities and one irrigation district in southwestern California. Members include the municipal utilities of the cities Anaheim, Burbank, Colton, Glendale, Los Angeles, Pasadena, and Riverside. The authority has interests in three power plants and three transmission projects in the western US. It is constructing a fourth generation project. Southern California Public Power Authority also provides legislative representation and cost efficiency services to its members.

NORESCO provides utility customers in the US with infrastructure development, design/build services, commissioning strategies, financing, and client-centered asset management services. The company develops and implements build/own/operate distributed generation, cogeneration, or combined heat and power projects; arranges, on a consulting basis, commodity electricity or gas supply; and provides firm contracting of energy supply. It also holds interests in independent power plants. Global leader in HVAC products and systems Carrier, a unit of UTC, owns NORESCO.

Natural gas supply is as natural as country and western to some Arkansans, thanks to Arkansas Western Gas. A subsidiary of Colorado-based natural gas distribution firm SourceGas, the company distributes natural gas to approximately 152,000 residential, commercial, and industrial customers in more than 90 cities and towns in northern Arkansas. Arkansas Western Gas, which operates through six regional offices across its services area also provides gas transportation services to industrial, end-use, and off-system customers, and it operates a gas storage facility.

Scottish Water provides water and wastewater services to 5 million customers in 2.4 million homes. The company, which is the one of five largest water utilities in the UK, operates about 29,340 miles of water mains, 31,150 miles of sewers, 300 water treatment works, and more than 1,900 wastewater treatment works. The government-owned company, which is overseen by the Scottish Parliament, is focusing on upgrading its provision of clean drinking water, making its services more efficient and helping to improve the environment by protecting the watersheds that supply the company's water.

Ozark Mountains need power and Ozarks Electric Cooperative aims to deliver. The member-owned not-for-profit cooperative serves more than 62,000 customers in about a dozen counties spread across northwest Arkansas and northeast Oklahoma. Its 350 miles of line reach industrial, commercial, residential, and agricultural power users. Ozarks Electric provides its customers with energy audits and information on saving energy as well as energy efficient water heaters and surge protectors. It is a member of Touchstone Energy, a national alliance of electric cooperatives in nearly 40 states. The coop was formed in 1938.

Suburban Propane Partners, L.P., through its subsidiaries, engages in the retail marketing and distribution of propane, fuel oil, and refined fuels, and the marketing of natural gas and electricity in the United States. The company’s Propane segment involves in the retail distribution of propane to residential, commercial, industrial, and agricultural customers, as well as wholesale distribution to large industrial end users. Its Fuel Oil and Refined Fuels segment engages in the retail distribution of fuel oil, diesel, kerosene, and gasoline to residential and commercial customers for use primarily as a source of heat in homes and buildings. The company’s Natural Gas and Electricity segment markets natural gas and electricity to residential and commercial customers in the deregulated energy markets of New York and Pennsylvania. Suburban Propane Partners, L.P. also sells, installs, and services various whole-house heating products, air cleaners, humidifiers, hearth products, and space heaters to the customers of propane, fuel oil, natural gas, and electricity products. As of September 26, 2009, it served approximately 850,000 residential, commercial, industrial, and agricultural customers through approximately 300 locations in 30 states located primarily in the east and west coast regions of the United States, including Alaska. Suburban Energy Services Group LLC serves as the general partner to Suburban Propane Partners, L.P. Suburban Propane Partners, L.P. was founded in 1945 and is based in Whippany, New Jersey.

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