ALLETE provides light to the northern climes. Most of its business is classified within its regulated operations, which include electric, gas, and water utilities located in northeastern Minnesota and northwestern Wisconsin. Those operations are conducted through subsidiaries Minnesota Power (about 145,000 customers) and Superior Water, Light and Power (about 35,000 customers for its electric, gas, and water utilities). ALLETE's other segment includes coal mining operations, emerging technologies related to electric utilities, and a real estate business (large land tracts in Florida). Subsidiary BNI Coal operates a mine in North Dakota that supplies, primarily, two generating co-ops, Minnkota Power and Square Butte.

Corning Natural Gas Corporation distributes natural gas through its own distribution and transmission network to residential, commercial, industrial, and municipal customers in the Corning, New York area, as well as to two other gas utilities that service the Elmira and Bath, New York areas. As of September 30, 2009, it served approximately 14,500 customers through 400 miles of pipeline in the Corning and Hammondsport, New York areas. Corning Natural Gas Corporation company was founded in 1904 and is headquartered in Corning, New York.

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.

Dairyland Power Cooperative provides its customers with lots of juice in the land of lactose. The firm provides electricity generation (about 1,420 MW of generating capacity) and transmission services for 25 member distribution cooperatives and 16 municipal utilities in five states (including Wisconsin). The member cooperatives and municipal utilities in turn distribute electricity to almost 252,900 consumers. Dairyland Power generates more than 1,100 MW of capacity from its coal-fired power plants; it also operates 3,150 miles of transmission lines and 280 substations.

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.

Carbtrol doesn't care about your carbohydrate consumption; instead, the company works to protect the health of the environment. Carbtrol makes activated carbon filters for air and water treatment, along equipment used for groundwater remediation and soil vapor extraction. In addition, the company supplies treatment systems designed to allow golf courses and car washes to recycle water. Carbtrol was founded in 1983. The company's primary product in the early years was activated carbon systems. It expanded its product line to include engineered packages using air stripping, vapor extraction technologies, and ion exchange treatment.

Platte River Power Authority supplies wholesale electricity to four municipalities (Estes Park, Fort Collins, Longmont, and Loveland) in northern Colorado, which in turn serve more than 140,500 residences and businesses. The utility, which is a political subdivision of the state of Colorado, has interests in fossil-fueled and wind-powered generation facilities; it also operates transmission assets and acts as a wholesale electric utility, acquiring, constructing and operating generation capacity and supplying electric energy on an as needed basis. Platte River Power Authority evolved from the Platte River Municipal Power Association, a consortium of 31 municipalities.

Brookfield Renewable Power (formerly Brookfield Power) produces electricity for the Americas. The power generating and marketing operations of its parent company Brookfield Asset Management operates 166 hydroelectric generating facilities in the Canadian provinces of Ontario, Quebec, and British Columbia (a total of 32 generating stations), as well as in the US (100), and Brazil (34). Brookfield Renewable Power is also developing wind power facilities to complement its hydroelectric power activities. It operates the 189 MW capacity Prince Wind project, the largest wind farm in Canada. The company has more than 4,200 MW of installed capacity.

American Transmission Company is an entrepreneur in the US power grid business. Connecting electricity producers to distributors, American Transmission owns, operates, monitors, and maintains 9,400 miles of high-voltage electric transmission lines and 510 substations in portions of Illinois, Michigan, Minnesota, and Wisconsin. American Transmission is one of the first for-profit transmission companies, formed when the US market deregulated in the early 2000s. The company operates the former transmission assets of some of its shareholders. About 30 utilities, municipalities, municipal electric companies, and electric cooperatives in its service area have an ownership stake in American Transmission.

The city-owned utility also produces and distributes steam to 250 customers along 14 miles of steam line. Lansing Board of Water and Light can chill out too. Its chilled water system delivers up to 10,000 tons of chilled water capacity to 14 customers to cool the interior of buildings in the downtown area. Lansing Board of Water and Light is the largest municipally owned utility in the state. It is also a major employer in the Lansing area.Letting off a little steam is a good thing for Lansing Board of Water and Light, which provides electricity to 96,000 residential, commercial, and industrial customers and water to about 55,000 customers in Lansing, Michigan

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