DTE Energy Company, together with its subsidiaries, operates as an electric and natural gas utility company in Michigan. It also involves in non-utility operations. The company’s Energy Utility segment engages in the generation, purchase, distribution, and sale of electricity in southeastern Michigan. It generates electricity from various fuels, including coal, as well as from nuclear and hydro facilitates. As of December 31, 2009, this segment owned and operated approximately 677 distribution substations and approximately 423,600 line transformers; and supplied electricity to 2.1 million residential, commercial, and industrial customers in southeastern Michigan. The company’s Gas Utility segment engages in the purchase, storage, transmission, distribution, and sale of natural gas in Michigan. As of December 31, 2009, this segment’s distribution system included approximately 19,000 miles of distribution mains, 1,177,000 service lines, and 1,312,000 active meters. It also owned approximately 2,100 miles of transmission lines that deliver natural gas; and supplied natural gas to approximately 1.2 million residential, commercial, and industrial customers throughout Michigan, as well as to approximately 17,000 customers in Adrian, Michigan. The company’s non-utility operations include natural gas pipelines and storage; unconventional gas exploration, development, and production; power and industrial projects, and coal transportation and marketing; and energy marketing and trading operations. Its customers include electric utilities, merchant power producers, integrated steel mills, and industrial companies. DTE Energy Company was founded in 1995 and is based in Detroit, Michigan.

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.

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.

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.

Piedmont Natural Gas Company, Inc., an energy services company, distributes natural gas to residential, commercial, industrial, and power generation customers in portions of North Carolina, South Carolina, and Tennessee. It also operates various energy-related businesses, including unregulated retail natural gas marketing, interstate natural gas storage, and intrastate natural gas transportation. As of October 31, 2009, the company served 952,469 retail customers and 61,000 customers served by municipalities. Piedmont Natural Gas Company, Inc. was founded in 1949 and is headquartered in Charlotte, North Carolina.

Tohoku Electric Power Company, Inc. (Tohoku Electric Power) serves nearly five million residences and one million commercial and industrial customers in the Tohoku region, which comprises the seven northernmost prefectures of Japan's main island of Honshu. The region contains 20% of Japan's land and 10% of its population, but accounts for only 6% of its GNP. With its mountainous landscape and heavy winter snow, Tohoku has lagged behind the rest of Japan in terms of industrial development. The region is still largely rural and is known as Japan's furusato or country home. However, the city of Sendai in Miyagi prefecture has boomed in recent years to rival the southern Japanese centers. Tohoku's climate and the inaccessibility of many parts of the region has presented Tohoku Electric Power with special problems.

Nicor Inc., through its subsidiaries, engages in natural gas distribution business in the United States. Nicor Inc. distributes natural gas to approximately 2.2 million residential, commercial, and industrial customers in northern Illinois. It also provides natural gas storage and transmission-related services to marketers and other gas distribution companies. The company’s gas distribution, transmission, and storage network includes approximately 34,000 miles of steel, plastic, and cast iron main; approximately 2.0 million steel, plastic/aluminum composite, plastic, and copper services connecting the mains to customers’ premises; and 8 underground storage fields. In addition, Nicor offers shipping services, including the transportation of containerized freight between Florida, the eastern coast of Canada, the Bahamas, and the Caribbean region. It transports building materials, and food and other necessities for developers, manufacturers, and residents in the Caribbean and the Bahamas; tourist-related shipments intended for use in hotels and resorts, and on cruise ships; and interisland shipments and northbound shipments of apparel and agricultural products, as well as provides inland transportation and cargo insurance services. As of December 31, 2009, the company operated a fleet of 11 owned vessels and 4 chartered vessels with a container capacity totaling approximately 5,270 Twenty-foot equivalent units. Further, it owns and/or leases containers, container-handling equipment, chassis, and other equipment. Additionally, Nicor involves in the marketing of energy-related products and services, including warranty and maintenance contracts, as well as repair and installation services of heating, air conditioning and indoor air-quality equipment, and customer move connection services for other utilities; and wholesale marketing of natural gas supply services. Nicor Inc. was founded in 1953 and is based in Naperville, Illinois.

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.

Calvalley Petroleum searches below the plateau for fuel for its customers. The company focuses on exploring for and producing oil and natural gas at Block 9 in the Republic of Yemen. The company, which has about 16 working wells (more than 50 have been drilled), produces some 5,000 barrels of oil each day. Its subsidiary Calvalley Petroleum (Cyprus) Ltd. is the operator of the property, which includes about 552,000 acres of land in the Sayun-Masila basin. Calvalley Petroleum has a net proved plus probable reserves of 7.8 billion barrels of oil equivalent.

Power and Texas come together at the Texas Municipal Power Agency, which provides electricity generation and transmission services to four municipal utilities (Bryan, Denton, Garland, and Greenville). The joint powers agency, which was created in 1975 by its member cities, owns and operates the 462-MW Gibbons Creek power plant and related transmission assets. In the wake of the oil embargo the early 1970s, the Texas Legislature created joint powers agencies that could perform all the duties of utilities except sell power to non-members. Bryan, Denton, Garland, and Greenville then formed the Texas Municipal Power Agency and harnessed locally available lignite to fuel a power generation plant.

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