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.

Enel S.p.A. owns and operates more than 70 renewable energy plants in 20 states and two Canadian provinces. Enel North America's plants have a capacity to generate 748.5 MW of power (406 MW of wind power, 314 MW of hydropower, 21 MW of biomass power and 7.5 MW of geothermal power). Its wind farms use Vestas and GE Energy turbines; its largest project, the Smoky Hill Wind Farm in Kansas, has 155 wind turbines that alone generate 250 MW of power (enough to power 85,000 homes for a year). Enel North America's only biomass plant is located in Quebec, where it offsets 1 million tons of carbon dioxide by burning wood waste each year.

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.

TransCanada Corporation operates as an energy infrastructure company in North America. The company operates in two segments, Pipelines and Energy. The Pipelines segment develops and operates energy infrastructure, including natural gas pipelines, regulated gas storage facilities, and projects related to oil pipelines. As of December 31, 2009, its pipelines network extended approximately 60,000 kilometers tapping into various gas supply basins in North America. The Energy segment engages in the acquisition, development, construction, ownership, and operation of electrical power generation plants; the purchase and marketing of electricity; the provision of electricity account services to energy and industrial customers; and the development, construction, ownership, and operation of non-regulated natural gas storage in Alberta. As of December 31, 2009, its power generation plants had 11,700 megawatts of power generation capacity. TransCanada Corporation was founded in 1951 and is headquartered in Calgary, Canada.

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.

As Sgt. Joe Friday would say: "Just the facts, Ma'am." There are 88 cities in Los Angeles County, and Glendale Water & Power serves one of them. Glendale is the third-largest city in the county, with 200,000 people (about 100,000 foreign-born). Glendale has three hospitals, one health center, 30 parks, and six libraries. The utility generates, transmits, and distributes electricity to 88,000 residential, commercial, and industrial customers in Glendale. The city-owned utility also provides water to 32,500 customers. Glendale Water & Power purchases water from as far away as 500 miles.

Pure water is the aim of water process engineering specialist Enpure. Enpure specializes in treating water, wastewater, and sludge for municipalities and businesses. Its services include process design and project management for water treatment facilities worldwide. There are more than 4,000 plants in 60 countries designed by Enpure. The company licenses the sonix ultrasound sewage treatment technology sold through Sonico, Enpure's joint venture with Atkins. It had been a part of the support services division of water utility AWG until its management (in partnership with Aberdeen Asset Management) bought out the company at the end of 2006. The company changed its name from PURAC at that time.

Southern Minnesota Municipal Power Agency,the power provider supplies wholesale electricity to its 18 member municipal distribution utilities, which in turn distribute power to more than 109,000 retail customers. The agency's main power source is the 900 MW Sherco 3-power plant generating unit near Becker, Minnesota. Southern Minnesota Municipal Power Agency owns 41% of the low-sulfur Western coal fueled plant in partnership Northern States Power Company, the unit's operator. It also relies on a range of intermediate and peaking units owned by the agency's members.

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.

Let's cut right to the point: construction materials and mining used to be the lifeblood of Knife River Corporation, but in recent years, its energy and utility operations have grown to be the largest portion of its business. Oil and natural gas production, power transmission, pipelines and power utilities now dominate Knife River's balance sheet. But don't count out its construction services division, which continues to produce record earnings. Knife River has operations in Alaska, Hawaii, Oregon, California, Idaho, Minnesota, Montana, North Dakota, Oregon, Texas, and Wyoming. The company is a subsidiary of MDU Resources Group, Inc.

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