The main tenet of TenneT's business is to keep the Dutch national power transmission grid running smoothly across the nation's high-voltage power lines, constantly balancing supply with demand. The state-owned company also provides inspection and maintenance services for the infrastructure. TenneT manages more than 2,040 miles of high-voltage transmission lines and more than 50 electrical substations. Subsidiary APX manages non-contracted wholesale energy transactions. In 2010 TenneT spent $1.1 billion to buy grid operator transpower from E.ON. In 2010 a TenneT and National Grid joint venture began laying the first section of a high-voltage cable to connect the power grids in the Netherlands and the UK.

Puerto Rico Electric Power Authority (PREPA) is prepared to serve an entire island nation. Founded in 1941, the government-owned utility is the sole electricity distributor for Puerto Rico, where it serves approximately 1.4 million residential and business customers. PREPA owns five primarily fossil-fueled power plants that give it nearly 5,800 MW of generating capacity, and it has more than 30,000 miles of transmission and distribution lines. In order to keep up with increasing demand, the Puerto Rican government has allowed independent power producers to build cogeneration plants on the island to sell power to PREPA.

Hawaiian Electric Industries, Inc., through its subsidiaries, primarily engages in electric utility and banking businesses primarily in the state of Hawaii. The electric utility business involves in the production, purchase, transmission, distribution, and sale of electricity from renewable energy sources, such as wind, solar, photovoltaic, geothermal, wave, hydroelectric, sugarcane waste, municipal waste, and other biofuels, as well as from fuel oil. It distributes and sells electricity on the islands of Oahu, Hawaii, Maui, Lanai, and Molokai, as well as serves suburban communities, resorts, the U.S. armed forces installations, and agricultural operations. The Banking business includes American Savings Bank, F.S.B., which involves in accepting savings accounts, checking accounts, money market accounts, and certificate of deposits; and providing real estate, residential mortgage, construction and development, multifamily residential and commercial real estate, consumer, and commercial loans. As of December 31, 2009, it owned 166 automated teller machines. The company was founded in 1891 and is based in Honolulu, Hawaii.

Sempra Energy, together with its subsidiaries, engages in the development of energy infrastructure, operation of utilities, and provision of energy-related products and services worldwide. It operates through two divisions, Sempra Utilities and Sempra Global. The Sempra Utilities division includes San Diego Gas & Electric, a regulated public utility that provides electric generation, transmission, and distribution services to 3.5 million consumers, and natural gas distribution services to 3.2 million consumers; and Southern California Gas, a regulated public utility that provides natural gas distribution, transmission and storage services to a population of 20.7 million. The Sempra Global division comprises of Sempra Commodities, a commodities-marketing business operating under the joint venture, RBS Sempra Commodities, with The Royal Bank of Scotland; Sempra Generation, which develops, owns and operates, or holds interest in electric power plants serving wholesale electricity markets in North America; Sempra Pipelines & Storage that develops, owns, operates, or holds interests in natural gas pipelines and storage facilities in the United States and Mexico, as well as in companies that provide natural gas or electric services in Argentina, Chile, Mexico, and Peru; and Sempra LNG, which develops, owns, and operates receipt terminals for importing liquefied natural gas. Sempra Energy was founded in 1998 and is headquartered in San Diego, California.

Environmental Waste Controls (EWC) slows down the fill-up of UK landfills. The company leases and sells waste-compactor equipment and provides maintenance services for the compactors. It also collects, transports, and recycles or disposes of waste for its 400-plus public- and private-sector customers, which include manufacturing and retail companies, food processors, hotels (such as Hilton and Radisson Hotels), railway stations, National Health Service Trusts, and local governments. The company was the subject of a management buyout in 2004. EWC was founded in 1993.

Basin Electric Power Cooperative, as do other electric-powered items in nine states from Montana to Iowa to New Mexico. The regional, consumer-owned power generation and transmission co-op generates more than 4,000 MW of capacity (mostly coal-fired) for some 136 rural electric member systems, which serve about 2.8 million people. Basin Electric's subsidiaries include Dakota Gasification (which produces natural gas from coal), Dakota Coal (markets lignite and limestone), Basin Telecommunications (Internet access), and Basin Cooperative Services (property management).

Scottish Water provides water and wastewater services to 5 million customers in 2.4 million homes. The company, which is the one of five largest water utilities in the UK, operates about 29,340 miles of water mains, 31,150 miles of sewers, 300 water treatment works, and more than 1,900 wastewater treatment works. The government-owned company, which is overseen by the Scottish Parliament, is focusing on upgrading its provision of clean drinking water, making its services more efficient and helping to improve the environment by protecting the watersheds that supply the company's water.

Renegy Holdings (formerly Catalytica Energy Systems) was formed in the 2007 merger of Catalytica with the renewable energy divisions of NZ Legacy, a land and energy development firm. Among other ventures, Renegy has built a biomass power generation plant near Snowflake, Arizona, that came online in 2008. The company has long-term power purchasing agreements in place with Arizona Public Service and Salt River Project to buy biomass electricity from the Snowflake White Mountain Power plant. To save costs, in 2009 Renegy delisted its stock from the NASDAQ exchange.

Midwest Energy for their power and gas needs. The utility serves approximately 48,000 electricity customers and 42,000 natural gas customers in central and western Kansas. It also has some power generation operations; it purchases most of its electric supply from wholesale marketers. The company's Midwest United Energy subsidiary is a competitive natural gas supplier in four states, and its WestLand Energy unit sells propane to Kansas consumers; it has sold its telecommunications business. Midwest Energy was formed in 1981 when the Central Kansas Electric Cooperative acquired investor-owned Central Kansas Power.

Southern California Edison (SCE) distributes electricity to a population of more than 13 million people in central, coastal, and Southern California (excluding Los Angeles and some other cities in the regions). The utility's system consists of about 12,000 circuit miles of transmission lines and more than 113,500 circuit miles of distribution lines. SCE also has 5,500 MW of net generating capacity from interests in nuclear, hydroelectric, and fossil-fueled power plants; it sold most of its fossil-fueled facilities in response to the state's deregulation legislation. The utility sells excess power to wholesale customers. SCE is a subsidiary of Edison International.

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