Summerleaze has blown through a number of businesses -- aggregates, waste disposal, and renewable energy. The family-owned company, originally in the gravels/aggregates business, branched into using methane gas from the waste disposal landfills to make fuel. After acquiring renewable energy firm Thomas Graveson, it created Summerleaze RE-Generation, which has enough capacity (43 MW) to serve 70,000 houses from sites across the UK. Ennate Technology provides power generation equipment sales, maintenance, and hire services; its Green Hydrogen subsidiary supplies renewable hydrogen and oxygen for clients. Summerleaze also has a biogas unit, Summerleaze AnDigestion.

Mississippi County get their electricity from a cooperative. Mississippi County Electric Cooperative (MCEC) serves customers in the northeast corner of Arkansas about 60 miles north of Memphis. The area is home to two steel mills owned by Nucor Corporation that are powered by MCEC power; most customers are industrial or agricultural. The coop also offers Internet service via rural satellite broadband provider WildBlue, and provides its customers with energy audits and information on saving energy. It is a member of Touchstone Energy, a national alliance of electric cooperatives in nearly 40 states. MCEC was formed in 1938.

Global Water Resources (GWRI) took the phrase "Think globally, act locally" to heart. The company provides water, wastewater, and recycled water utility services to 14 utilities and more than 60,000 people in its service area around Phoenix. Its recycled water is treated and purified wastewater used for non-potable and outdoor purposes, sent through a separate system of pipes than drinking water. GWRI says its reclaimed water project saves up to 40% of drought-prone Arizona's scarce groundwater. The utility also extends water and wastewater infrastructure financing to regional developers and builders. The company was formed in 2003. Once privately held, GWRI went public in an IPO in late 2010.

Union Gas has a habit of bringing natural gas and energy consumers together. The utility, a subsidiary of midstream maven Spectra Energy transmits and distributes natural gas to more than 1.3 million residential and business customers in more than 400 communities throughout most of the Canadian province of Ontario. It also provides gas transportation and storage services for other utilities and businesses in Canada and the US. Union Gas operates 3,000 miles of transmission pipeline, 37,000 miles of distribution main and service pipeline, and 22 underground storage facilities.

North Carolina Electric Membership Corporation (NCEMC) generates and transmits electricity to the state's 26 electric cooperatives in 93 of North Carolina's 100 counties. The co-op owns more than 600 MW of generating capacity through four primarily natural gas peak load generators, plus a 62% stake in Catawba Nuclear Station Unit 1, and a 31% stake in the common facilities of the Catawba Nuclear Station in South Carolina. It also buys power from Progress Energy, American Electric Power, and other for-profit utilities. NCEMC's member cooperatives serve more than 950,000 businesses and homes in North Carolina. The wholesale co-op also operates an energy operations center.

Detroit Edison generates and distributes electricity to 2.1 million customers in Michigan. The utility, a unit of regional power player DTE Energy, has more than 11,080 MW of generating capacity from its interests in nfossil-fueled, nuclear, and hydroelectric power plants. It operates more than 44,000 circuit miles of distribution lines and owns and operates about 680 distribution substations. Detroit Edison also sells excess power to wholesale customers and provides coal transportation services.

ReliOn relies on its ability to produce hydrogen fuel cells in order to make money. The company claims to be the world's leading developer and marketer of modular, cartridge-based, proton exchange membrane fuel cell technology. ReliOn markets a range of stationary fuel cells for emergency and back up power systems, uninterruptible power supplies, digital power needs and a range of off grid power requirements. The company has sold and installed more than 2 MW of products with private and public entities in the energy, telecommunications, and transportation segments. Investors include Avista, Enterprise Partners Venture Capital, and Wall Street Technology Partners.

Horizon Wind Energy owns and operates more than 20 onshore wind farms across nine states that have a generating capacity of 2,800 MW. It has another 20,000 MW of wind projects in various stages of development around the country. Horizon sells its electricity wholesale as Power Purchase Agreements (PPAs) to utility companies such as AmerenUE, Direct Energy, Great River, and the TVA. It has also developed and sold seven farms to Entergy, Florida Power & Light, and Puget Energy.

Organic Resource Management (formerly National Challenge Systems) has an organic approach to the disposal of waste material across Canada. Providing non-hazardous and organic waste disposal services, Organic Resource Management's services include cleaning catch basins, drains, grease-traps, and sewers; food-waste recycling; and raw material and product destruction. Organic Resource Management serves more than 8,000 commercial, industrial, institutional, and residential customers in British Columbia, Ontario, and Quebec. In 2008 it sold the non-core assets of non-hazardous liquid waste subsidiary A&A Anderson Tank Services to McRae's Environmental Services.

Clean water is the goal of H2O Innovation. For amusement parks, campgrounds, cities, schools, zoos, and other enterprises, H2O Innovation uses micro filtration, ultra filtration, nanofiltration, and reverse osmosis to create drinking water, as well as clean water for manufacturing and other purposes. H2O Innovations also treats wastewater, offers equipment for the maple syrup industry, and desalinates seawater and brackish water. In 2007 it became the first North American company to be listed on the Alternext (Euronext) Exchange in Paris. By 2008 the company had installed more than 400 systems in Canada, the US, and elsewhere.

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