Huntsville, Alabama residents don't have to hunt far to find gas, power, and water. Government's utility City of Huntsville Electric, Natural Gas and Water Systems provides all of these resources. Known as Huntsville Utilities, the company distributes electricity to more than 156.000 residential, commercial, and industrial customers in the city and surrounding areas; it also provides natural gas to 46,200 customers and water services to more than 82,000 customers. Huntsville Utilities buys electricity from the Tennessee Valley Authority. The utility's gas comes from Gulf of Mexico suppliers, and its water is pumped from underground aquifers and the Tennessee River.

Alpiq (formerly Aare-Tessin Ltd. for Electricity, or Atel) is the largest supplier of electricity in Switzerland. It generates electricity by means of hydro, nuclear, and coal power, then trades and distributes it through its transmission grid across Switzerland and 28 other European countries. Its main markets include Italy, Germany, France, and countries in Central and Eastern Europe. Alpiq has 5,270 MW of generating capacity. The company also provides energy services including engineering, construction, and maintenance. Atel merged with fellow Swiss energy company EOS Holding in 2009 and became Alpiq. EOS owns 31% of the company; French energy giant EDF, 25%.

Mesa Power Group, it takes an oil tycoon from Texas to raise the profile of wind energy in North America. Controlled by veteran oilman and renewable energy proponent T. Boone Pickens, who gained national attention with the Pickens Plan, a campaign aimed at reducing US dependence on foreign oil, the company is engaged in developing and investing in wind power projects. It acquires these projects and completes development on them through a joint venture with GE called the American Wind Alliance (AWA). It typically targets projects in Canada and the US that have secured land control, access to transmission lines, and minimum capacity of 100 megawatts.

Aquilex speaks softly and carries a big wrench. Through its operating subsidiaries, Aquilex Corporation provides maintenance, repair services and technical support to heavy industry worldwide. Customers include power generation facilities and other industrial plants, including cement, chemical, petrochemical, oil and natural gas processing, pulp and paper, metal refining, and steel manufacturing operations. The company was controlled by private equity firm Harvest Partners (which bought the company from First Reserve in 2007). In 2008 Harvest Partners sold the company to Teachers' Private Capital, the private investment arm of the Ontario Teachers' Pension Plan.

Enersis S.A., through its subsidiaries, engages in electric power generation, transmission, and distribution in Argentina, Brazil, Chile, Colombia, and Peru. It generates electricity using water, coal, oil or natural gas, and wind resources. The company also transports natural gas to refineries, generators, distribution companies, and industrial and mining clients; develops real estate; provides consulting and engineering services in various specialties; and engages in tunnel operation. In addition, it provides information technology (IT) services, which include outsourcing and infrastructure, data centers, contact centers and mass printing services, remote applications service provider, and assessment and implementation of technology solutions to support business processes; products integration, information systems services and technologies, and implementation and maintenance; and IT solution construction and development for high availability and complex business processes. Further, Enersis S.A. offers various products and services related to electricity comprising measuring and certification services; engineering, construction, assembly, and electric power operations; and energy consulting services to companies in various industrial sectors, such as retail, telecommunications, manufacturing, agro-industrial, and mining. As of December 31, 2008, it had an installed generation capacity of 13,893 MW, and supplied electricity to approximately 12 million customers. The company was formerly known as Compania Chilena Metropolitana de Distribucion Electrica S.A. and changed its name to Enersis S.A. in 1988. Enersis S.A. was founded in 1889 and is headquartered in Santiago, Chile. Enersis S.A. operates as a subsidiary of Endesa Latinoamerica SA.

FERSA Energias Renovables has found being green isn't too difficult. The Spanish holding company invests in and operates companies that produce electricity utilizing such renewable energy resources as wind power, solar energy, and biomass. The company's holdings span the European continent with investments in wind farms in Spain, Estonia, and Italy as well as holdings in Panama, India, and China. Holdings include Eolica el Pedregoso, Elolica de Pino, Parque Eolico Hinojal, Enrilews, and OU Est Wind Power. The company also has holdings in solar power and biomass operations in Spain through Invetem Mediterranea and Gestora Fotovoltaica de Castellon.

Canadian Utilities is the strong arm of diversified energy company ATCO and accounts for most of its sales. Canadian Utilities' regulated utilities operations are ATCO Gas, which distributes natural gas to more than 1 million customers in almost 300 communities in Alberta, and ATCO Electric, which provides electricity to about 207,000 customers. ATCO Pipelines provides natural gas transportation services to producers, major industrial users and gas distribution companies in Alberta. Canadian Utilities' Energy unit (including ATCO Power, ATCO Midstream and ATCO Energy Solutions) manages power generation and pipeline activities. The Technologies segment provide business systems solution through ARCO I-Tek.

Summit Energy Services is a major provider of energy management and procurement services for industrial and commercial companies, and operates in 56 countries. A consolidator in a fragmented industry, the company's offerings include market intelligence reporting, need and competitive supply analysis, contract negotiation, utility bill auditing, risk advisory planning, and energy efficiency projects. It serves the automotive, healthcare, transportation, and food industries, as well as chemical, metal, paper, and plastic manufacturing companies, and municipal and state governments and hospitality and real estate management enterprises. Summit Energy Services has more than 650 clients.

Plambeck Neue Energien develops and operates renewable power wind farms in Germany and other European countries. The company has developed 74 wind farms in Germany. Plambeck developed its first wind farm -- Windpark Marschland -- in 1995. The company bought SSP Technology A/S, a maker of light and efficient rotor blades based in Denmark. Plambeck has sold its solar business in order to focus on its wind farm operations. In 2006 the company announced plans to join with Evelop to develop an 80-wind turbine offshore wind farm project, Gode Wind I, in Germany. In 2008 Plambeck established a subsidiary in the US.

Intermountain Power Agency facilities, which began operating in 1987, supply power to the 23 founding municipalities. IPA also sells power through contracts with 13 additional utilities in Utah and California. The IPA is operated by The Los Angeles Department of Water and Power.If you're into mountains (and who isn't?) Intermountain Power Agency (IPA) may well be the key to your access to power. IPA was formed in 1977 by 23 Utah municipal electric utilities to develop and operate the Intermountain Power Project (IPP), a two-unit coal-fired generation facility with a capacity of 1,700 MW, and two high-voltage transmission systems.

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