OGE Energy is the holding company for the largest electric utility in Oklahoma, but its largest revenue producer is its energy marketing and natural gas transmission unit, OGE Energy Resources. OGE owns Oklahoma Gas and Electric (OG&E), a public utility with almost 777,000 retail and wholesale customers in Oklahoma (including Oklahoma City) and a bit of western Arkansas. OG&E owns coal- and gas-fired power plants that generate 6,420 MW of capacity. Subsidiary Enogex operates 7,900 miles of natural gas gathering and transportation pipeline. The company also provides physical, asset, financial management services through marketing unit OGE Eenergy Resources.

Northwest Natural Gas Company stores and distributes natural gas in Oregon, Washington, and California. The company operates in two segments, Local Gas Distribution and Gas Storage. The Local Gas Distribution segment distributes natural gas in Oregon and southwest Washington. This segment engages in building and maintaining pipeline distribution system, purchasing gas from producers and marketers, contracting for the transportation of gas over pipelines from the supply basins to service territory, and reselling the gas to customers. It also transports gas owned by customers from the interstate pipeline connection, or city gate, to the customers’ facilities. This segment serves various industries, including pulp, paper, and other forest products; companies manufacturing electronic, electrochemical, and electrometallurgical products; companies engaged in processing of farm and food products; metal fabrication and casting companies; organizations that produce various mineral products, machine tools, machinery, and textiles; companies that manufacture asphalt, concrete, and rubber; printing and publishing companies; nurseries; government and educational institutions; and electric generation companies. As of December 31, 2009, it served approximately 668,000 total utility customers comprising approximately 605,000 residential, 62,000 commercial, and 1,000 industrial sales and transportation customers. The Gas Storage segment offers underground natural gas storage services to interstate and intrastate customers in the Pacific Northwest. It holds interests in approximately 8,500 net acres of underground natural gas storage in Oregon and approximately 1,900 net acres of underground natural gas storage in California; and interests in approximately 1,600 net acres of oil and gas leases in Oregon. This segment serves primarily natural gas distribution, electric generation, and energy marketing companies. Northwest Natural Gas Company was founded in 1910 and is headquartered in Portland, Oregon.

Lyntegar Electric Cooperative is based in the agricultural heart of the Texas Panhandle, where the summer heat sizzles and the winter ice storms freeze. The rural power cooperative provides electric utility services to customers in Borden, Dawson, Gaines, Garza, Hockley, Lynn, Martin, Terry, and Yoakum counties. The cooperative also sells electric grills and provides internet and television services. In addition, Lyntegar Electric Cooperative produces Typically Texas Cookbooks, which share collections of recipes used by cooperative member-consumers.

Techem knows when the heat is on. The company is a leading European utility services firm (with operations in 20 countries) that monitors energy and water consumption in 8 million end-user households, primarily apartments and multi-family dwellings in Germany. It also offers its 690,000 clients additional services such as heat and water meter sales and rentals, heating system maintenance, and bill collection. Techem Energy Contracting builds and operates facilities for energy supply, and the company's IT division offers property management software.

TestAmerica Laboratories (formerly Severn Trent Laboratories) can tell you. It operates about 40 environmental testing laboratories and more than 30 service centers in the US. TestAmerica provides chemical, physical, and biological testing of air, drinking water, tissue, and solid waste. The company has developed technologies to test air for fire retardants, explosives, radiation, and source emissions. Its affiliates include environmental and geotechnical drilling firm TestAmerica Drilling, water sampling equipment and remediation pumping system provider QED Environmental Systems, and air quality analyst EMLab P&K).

Rutherford Electric Membership Corporation provides power to more than 67,000 members located in 10 counties (Burke, Catawba, Caldwell, Cleveland, Gaston, Lincoln, McDowell, Mitchell, Polk and Rutherford) in the Southwestern Piedmont region of North Carolina. The cooperative (which had a membership of only 394 in 1938, but grew rapidly after WWII) owns and maintains about 7,000 miles of power line. Rutherford Electric has total assets of more than $300 million. The cooperative is a member of the Touchstone Energy Cooperatives network.

Environmental, Safety & Health, Inc. (ES&H) will follow through. Serving US companies and government agencies, ES&H provides training and services for safety, health, environmental, and regulatory concerns. The company also offers general contractor services for construction, demolition, and remediation projects. Clients include corporations like Schering-Plough and Alcoa, as well as districts or regional divisions of government agencies like the FAA and US Army Corps of Engineers. Founded in 1997, ES&H is based in Tennessee and operates offices in Delaware and Louisiana.

Through its regulated utility subsidiaries, Aquarion distributes water to more than 180,000 homes and businesses (or about 580,000 people) in some 39 communities in Connecticut, Massachusetts, and New Hampshire. It is one of the 10 largest investor-owned utilities in the US. The company's Aquarion Services unit provides contract management of municipal water and wastewater systems, along with engineering and management consulting services and consumer water line protection plans. In 2007 UK-based Kelda Group sold control of Aquarion to Australia's Macquarie Bank for $860 million.

SEMCO ENERGY is owned by energy investment firm Continental Energy Systems through its Cap Rock Holding unit. Alaska and Michigan have more in common than a cold climate. SEMCO ENERGY serves approximately 410,000 natural gas consumers in both states. The company's main subsidiary is utility SEMCO ENERGY Gas, which distributes gas to about 280,000 customers in 24 Michigan counties. SEMCO's ENSTAR Natural Gas unit distributes gas to about 130,000 customers in and around Anchorage, Alaska. The company's unregulated operations include propane distribution in Michigan and Wisconsin; pipeline and storage facility operation; and information technology outsourcing.

Dee Valley Group, operating through its Dee Valley Water unit, supplies water to more than 106,000 households and 8,250 commercial, industrial, and business customers in North East Wales and Cheshire. Dee Valley Water, formed from the combination of Wrexham Water and Chester Waterworks, supplies water to an 831-sq.-km. area. Dee Valley Water exited its nonwater operations in 2002. The company has been investing in its mains and distribution system to preventage leakage, and in 2005 it completed a 15-year water main rehabilitation program. It also commissioned a water treatment works at Pendinas. Dee Valley Group was created in 1994 as the holding company for Wrexham Water. Axa Sun Life owns 35% of the company.

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