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.

Southern Union Company, together with its subsidiaries, engages in the gathering, processing, transportation, storage, and distribution of natural gas in the United States. It operates in three segments: Transportation and Storage, Gathering and Processing, and Distribution. The Transportation and Storage segment engages in the interstate transportation and storage of natural gas in the Midwest and from the Gulf Coast to Florida. It also provides liquefied natural gas (LNG) terminalling and regasification services. The Gathering and Processing segment involves in gathering, treating, processing, and redelivering natural gas and natural gas liquids (NGLs) in Texas and New Mexico. It operates a network of approximately 5,500 miles of natural gas and NGL pipelines, 4 cryogenic processing plants with a combined capacity of 410 MMcf/d, and 5 natural gas treating plants with a combined capacity of 585 MMcf/d. The Distribution segment engages in the local distribution of natural gas in Missouri and Massachusetts. This segment serves approximately 550,000 residential, commercial, and industrial customers through local distribution systems consisting of 9,140 miles of mains, 6,185 miles of service lines, and 45 miles of transmission lines. Southern Union company was founded in 1932 and is based in Houston, Texas.

MidAmerican Energy Holdings reaches farther than its name implies. The company generates, transmits, and distributes electricity and natural gas to 6.9 million customers across the US and the UK, primarily through subsidiaries MidAmerican Energy Company, PacifiCorp, and CE Electric UK. UK regional distribution subsidiaries Northern Electric and Yorkshire Electricity serve about 3.8 million electricity customers. MidAmerican Energy Holdings also has independent power production; real estate (HomeServices of America); and gas exploration, production, and pipeline operations (Kern River Gas Transmission and Northern Natural Gas). Warren Buffett's Berkshire Hathaway controls the company.

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.

Aquilex speaks softly and carries a big wrench. Through its operating subsidiaries, Aquilex Corporation provides maintenance, repair services and technical support to heavy industry worldwide. Customers include power generation facilities and other industrial plants, including cement, chemical, petrochemical, oil and natural gas processing, pulp and paper, metal refining, and steel manufacturing operations. The company was controlled by private equity firm Harvest Partners (which bought the company from First Reserve in 2007). In 2008 Harvest Partners sold the company to Teachers' Private Capital, the private investment arm of the Ontario Teachers' Pension Plan.

Minnesota Power can keep both Vikings and Packers warm. The utility, an operating unit of ALLETE, provides electricity to about 144,000 customers in northeastern Minnesota and northwestern Wisconsin, as well as wholesale electricity to 16 municipal systems. Large industrial customers include Boise White Paper (a subsidiary of Boise Cascade) and Hibbing Taconite (a joint venture owned by ArcelorMittal, Cliffs, and US Steel). Its largest purchasing contract is with the Square Butte Electric Co-op in North Dakota -- Minnesota Power gets half of Square Butte's output -- but the company is attempting to transition from Square Butte's traditionally coal-generated energy to wind power.

Graver Technologies makes filtration and separation products to eliminate impurities from water and air. The company's offerings include adsorbents, industrial air and gas filters, ion exchange resins, liquid filter cartridges, and stainless steel filter membranes. Its production locations are in Delaware, New Jersey, and New York. Graver Technologies' products are used primarily in manufacturing processes. The company's customers include operators of power plants and companies in the chemical, food and beverage, and pharmaceutical industries, along with makers of compressors, pumps, and turbines. Graver Technologies is a unit of the diversified Marmon Group of manufacturing companies.

The Dakota Electric Association delivers electricity to residents of southeastern Minnesota, the Gopher State , so they don't have to burrow underground for those long, cold winters. The member-owned utility serves more than 100,000 customers in portions of Dakota, Goodhue, Rice, and Scott counties south of Minneapolis-St. Paul. The co-op gets its power wholesale from transmission cooperative Great River Energy and distributes it over 3,720 miles of power lines, nearly two-thirds of which are buried. Dakota Electric is pushing energy efficiency programs and products to help save its customers money.

Memphis Light, Gas and Water Division (MLGW) helps lighten up the Memphis blues. The municipally owned utility provides electricity, water, and natural gas services for all of Shelby County, Tennessee, including the city of Memphis. It serves primarily residential and commercial customers. MLGW buys electricity from the Tennessee Valley Authority (TVA) and distributes it to more than 420,000 customers. The company purchases natural gas on the spot market, transmits it through open access pipelines, and delivers it to about 320,000 customers. Through its artesian water system, MLGW supplies water to more than 257,000 customers.

Northumbrian Water Group (NWG) provides water utility services in both northern and southern England. The company's primary subsidiary, Northumbrian Water Limited, provides water and wastewater services to 2.6 million people in North East England under the Northumbrian Water brand; it provides water to 1.8 million people in South East England, where it operates as Essex and Suffolk Water. NWG also controls a number of special purpose companies with contracts in Scotland, Ireland, and Gibraltar. The company's SA Agrer NV unit conducts project work in developing countries, The Ontario Teachers' Pension Plan controls 26% of the company.

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