United Air Specialists has ESP, and the company knows just when to cause static. The company's industrial air pollution control unit makes electrostatic precipitators (ESP) that electrify airborne particles and remove them from the air. United Air Specialists also makes commercial air-cleaning systems, including kitchen emissions systems. In addition, the company makes electrostatic fluid control and high-precision spraying equipment. The company's products are used in offices, hospitals, bars, schools, and industrial settings. United Air Specialists, founded in 1966, is part of the industrial and environmental filtration business unit of manufacturing group CLARCOR.

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.

Pacific Northern Gas (PNG) provides natural gas in west-central and northeastern British Columbia. The utility serves more than 39,100 residential, commercial, and industrial customers over its transmission and distribution system. Its large industrial customers include timber company West Fraser and metals maven Rio Tinto Alcan. In 2008 these customers accounted for about 26% of PNG's annual total gas deliveries and more than 5% of its revenues. British Columbia Hydro and Power Authority (BC Hydro) is also a major customer. Most of PNG's customers buy gas directly from producers or suppliers but contract with PNG to have it pipelined to them. Pacific Northern Gas Ltd. entered the renewable power business in 2010.

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.

Public Works Commission of the City of Fayetteville, North Carolina (PWC), which is responsible for operating, maintaining, and upgrading the municipal electric, water, and wastewater utility systems. PWC distributes electricity and water to more than 78,000 residential, commercial, and industrial customers. The electric utility has about 930 miles of underground power lines, 24,100 distribution line transformers and more than 47,160 poles. The water utility has 1,260 miles of mains; the wastewater unit, 1,180 miles of sewer line.

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.

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.

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.

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.

GDF SUEZ Energy North America (GDF-SENA) manages GDF Suez Energy International's energy business in Canada, Mexico, and the US. The company develops and operates electricity and cogeneration facilities, markets and sells energy products and services, and imports and distributes natural gas and liquefied natural gas (LNG). It serves both commercial and industrial customers. (GDF-SENA)'s primary unit (GDF SUEZ Energy Generation NA) owns and operates 60 power, cogeneration, steam, and chilled-water facilities, including those in construction, representing a capacity of 7,500 MW of electricity generation, 6 million pounds per hour of steam, and 42,000 tons per hour of chilled water.

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