Pinnacle West Capital is at the peak of the energy pyramid in Arizona. It is the holding company for the state's largest electric utility, Arizona Public Service (APS), which transmits and distributes electricity to 1.1 million residential, commercial, and industrial customers throughout most of the state. The utility also has more than 6,280 MW of generating capacity. Through APS and other subsidiaries, Pinnacle West markets wholesale and retail power in Arizona and the western US. The company also develops and manages real estate and invests in energy ventures.

Otter Tail covers a swath of businesses, from electric services and food-ingredient processing to manufacturing equipment, plastics, and health services. Its electric utility and energy activities are subsidiaries of Otter Tail, and its subsidiary Varistar holds Otter Tail's other interests. The electric utility has been the company's core effort since Otter Tail's start in 1907; it keeps the lights on for 129,000-plus residential, commercial, and industrial customers in Minnesota and the Dakotas. Otter Tail also makes PVC pipes, wind towers, metal parts, and processes potato flakes, as well as offers diagnostic medical equipment, and construction and trucking services.

Energen Corporation, an energy holding company, engages in the acquisition, exploration, development, and production of oil, natural gas, and natural gas liquids in the continental United States. It also involves in the purchase, distribution, and sale of natural gas to residential, commercial, and industrial customers, as well as other end-users of natural gas in central and north Alabama. In addition, the company provides gas transportation services for industrial and commercial customers located on its distribution system. As of December 31, 2009, Energen Corporation had proved oil and gas reserves of 1,547 billion cubic feet equivalent in the San Juan Basin in New Mexico and Colorado, the Permian Basin in west Texas, and the Black Warrior Basin in Alabama. Energen Corporation was founded in 1929 and is headquartered in Birmingham, Alabama.

Companhia Paranaense de Energia – Copel engages in the generation, transmission, distribution, and sale of electricity for industrial, residential, commercial, and rural customers primarily in the State of Parana, Brazil. It owns and operates 18 power plants, including 17 hydroelectric power plants and 1 thermal power plant with an installed capacity of 4,550 MW; transmission system comprising 1,913 km of transmission lines and 30 substations; and distribution system, including 180,696 km of distribution lines and 350 substations. The company serves approximately 3,671,262 consumers. It also provides telecommunication and communication services consisting of broadband Internet, private networks IP/MPLS-VPN, videoconference, and hosting services to schools, banks, supermarkets, Internet providers, industries, public bodies, stores, and fixed and mobile telephone operators. In addition, company has 6,026 km of OPGW cables, installed between the main ring and urban radials, totaling 10, 054 km and reaching 226 cities Parana. Further, it distributes piped gas. The company was founded in 1954 and is headquartered in Curitiba, Brazil.

STP Nuclear Operating Company (STPNOC) is pulling out all the stops to make sure that the lights burn brightly in the Lone Star State. The company manages the South Texas Project Electric Generating Station on a 12,220-acre site near Bay City, Texas. The nuclear power plant's two reactors, which went into operation in 1988 and in 1989, produce about 2,700 MW of electricity and serve 2 million homes in Texas. The company is jointly owned by NRG Energy (44%), CPS Energy (40%), and Austin Energy (16%). STPNOC accounts for about 7.5% of the power consumed in Texas.

Omaha Public Power District (OPPD), a subdivision of the Nebraska state government, OPPD generates and distributes electricity to residents and businesses in 13 counties in southeastern Nebraska. It operates and maintains its facilities without tax revenues and raises money for major construction through bonds. OPPD serves more than 340,000 customers in an area covering 5,000 sq. mi. The utility has a generating capacity of more than 3,220 MW, which is powered by nuclear, coal, oil, and natural gas sources. It sells wholesale power to other utilities and offers energy consulting and management services.

Shell International Renewables (doing business as Shell Renewables) may be able to turn them into fuel to power homes and vehicles. The company oversees many of the parent Royal Dutch Shell's operations in alternative fuels, was formed in 1997 to commercially explore the global possibilities of new low-carbon power systems. Shell Renewables markets and distributes alternative energies from the sun, the wind, hydrogen (technically an energy carrier rather than energy source), and bio-fuels worldwide. It is researching hydrogen created from natural gas and bio-fuels, made of everything from corn to algae, to replace gasoline in cars.

RainSoft (a division of Aquion Water Treatment Products) wants to clear up the water in your home or office. Through its division, the company makes residential and commercial water treatment equipment. Products include whole-house water conditioning systems, drinking water systems, and filters designed to remove particular contaminants that detract from water's taste and odor. RainSoft's products are distributed through a network of about 300 independent dealers in the US and in 24 countries in Asia, Europe, and the Middle East. Clients have included Allstate , Dow Chemical, Ford Motor, Holiday Inn, and Underwriters Laboratories.

F.B. Leopold wants to give you a nice, lean glass of water. The company develops and manufactures water and wastewater clarification, purification, and sludge collection equipment and backwash recovery systems. Customers include companies in the water and wastewater treatment industries. Its wastewater treatment systems include tertiary filtration, denitrification, clarification, and sludge collection systems. Founded in 1924, F.B. Leopold has been a part of ITT's Water & Wastewater Treament division since 2006.

Nature Group (formerly Nature Technology Solutions) provides wastewater treatment services to the oil, shipping, and offshore industries. Its technologies treat various types of industrial, marine, and oil industry waste streams, including using an environmental-friendly additive that helps remove hydrocarbons in oily wastewater. It helps operate port treatment plants in Gibraltar and Tananger, Norway, and a sewage treatment plant in Gibraltar; it is also involved in decommissioning refineries, installing treatment plants, and treating wastewater on offshore rigs.

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