AGL Resources Inc., an energy services holding company, distributes natural gas primarily in Florida, Georgia, Maryland, New Jersey, Tennessee, and Virginia. It operates in four segments: Distribution Operations, Retail Energy Operations, Wholesale Services, and Energy Investments. The Distribution Operations segment operates six natural gas distribution utilities that construct, manage, and maintain intrastate natural gas pipelines and distribution facilities. It operates approximately 46,000 miles of underground distribution and transmission mains. The Retail Energy Operations segment markets natural gas and related services under the Georgia Natural Gas name to retail customers on an unregulated basis primarily in Georgia, Ohio, and Florida, as well as to commercial and industrial customers principally in Alabama, Tennessee, North Carolina, South Carolina, and Georgia. The Wholesale Services segment involves in asset management and optimization, storage, transportation, production, and peaking services, as well as engages in wholesale marketing business.The Energy Investments segment develops, acquires, and operates salt-dome and other storage assets in the Gulf Coast region of the United States. It has approximately 7.5 billion cubic feet of liquefied natural gas (LNG) storage capacity in five LNG plants located in Georgia, New Jersey, and Tennessee, as well as owns three propane storage facilities in Virginia and Georgia. AGL Resources Inc. has a joint venture agreement with TECO Energy Inc. to provide home warranty products and services under the brand name UtiliPRO; and with El Paso Corp. to distribute liquefied natural gas (LNG) across the southeastern United States to the heavy-duty transportation market. AGL Resources Inc. was founded in 1856 and is based in Atlanta, Georgia.

UIL Holdings, parent of electric utility The United Illuminating Company (UI), hopes its well regulated business will result in regular revenue growth. The public utility distributes electricity to 325,000 customers in southwestern Connecticut. Its service area, largely urban and suburban, includes the principal cities of Bridgeport (population 137,000) and New Haven (population 124,000) and their surrounding areas. UIL Holdings has teamed up with NRG Energy to form GenConn Energy LLC, a joint venture that focuses on developing new power generation facilities in Connecticut. In 2010 the company acquired three gas utilies in New England from IBERDROLA USA for $1.3 billion.

Vectren intends to inundate Indiana and Ohio with energy. Through its utility subsidiaries (Indiana Gas Company, Southern Indiana Gas and Electric, and Vectren Energy Delivery of Ohio), the company distributes natural gas to 995,000 business and residential customers in the two states. It also distributes electricity to 141,000 customers and has 1,425 MW of primarily coal-fired generating capacity in Indiana. Vectren's other nonregulated businesses include retail and wholesale energy marketing and management services, coal mining, synthetic fuels production, and utility infrastructure construction.

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.

Transportadora de Gas Del Sur S.A. engages in the transportation of natural gas, as well as production and commercialization of natural gas liquids primarily in Argentina. It operates approximately 8627 km long pipeline system. Transportadora company transports its natural gas to distribution companies, industries, traders, producers, and power plant operators. The company’s production and commercialization activities are conducted at the Cerri Complex located near Bahia Blanca. Its natural gas liquid products comprise ethane, propane, butane, and natural gasoline. It also provides midstream services, which consist of gas treatment, gas compression, and wellhead gas gathering services; removal services for impurities from the natural gas stream; and pipeline construction, operation, and maintenance services. In addition, the company offers telecommunication services for telephone operators and other corporate users. Its telecommunication network includes a microwave's digital system with synchronous digital hierarchy technology. Transportadora company was founded in 1992 and is based in Buenos Aires, Argentina. Transportadora de Gas Del Sur S.A. is a subsidiary of Compania de Inversiones de Energia S.A.

Caithness region might well serve as an inspiration for Caithness Corp., which develops wind and other renewable power plants in the US under the Caithness Energy brand. Although the firm has focused on the development, acquisition, operation, and management of geothermal, hydroelectric, wind, and solar energy power projects, it also develops environmentally friendly fossil-fueled plants. Caithness is one of the largest producers of renewable energy in the US, and has developed more than 350 MW of geothermal projects, 160 MW of solar plants, and 440 MW produced by wind turbines. On the cleaner fossil fuel plant side it has also developed more than 2,000 MW of gas-turbine powered capacity.

WGL Holdings, Inc. engages in the delivery and sale of natural gas, and provides energy-related products and services in the District of Columbia, Maryland, Virginia, and Delaware. WGL Holdings, Inc. operates through three segments: Regulated Utility, Retail Energy-Marketing, and Design-Build Energy Systems. The Regulated Utility segment delivers natural gas to retail customers, as well as sells natural gas to customers who have not elected to purchase natural gas from unregulated third-party marketers. The Retail Energy-Marketing segment sells natural gas and electricity directly to residential, commercial, and industrial customers. As of September 30, 2009, it served approximately 151,000 residential, commercial, and industrial natural gas customers, and 113,000 electricity customers. The Design-Build Energy Systems segment focuses on upgrading the mechanical, electrical, water, and energy-related systems of government and commercial facilities by implementing traditional, as well as alternative energy technologies. WGL Holdings, Inc. was founded in 1848 and is headquartered in Washington, District of Columbia.

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.

Making money by water, Biwater provides water and wastewater treatment services to a range of customers in more than 90 countries. The company also offers water infrastructure investment, consultancy and operation; water asset management; and project management for water leisure facilities. Its Biwater Leisure unit has installed several Olympic-sized pools for almost 40 years. Its international projects include the design and installation of a wastewater treatment plant in Dubai, and a water distribution system for 4.2 million customers in Malaysia. Biwater also designs and builds desalination plants. Focusing on international growth, in 2010 it sold its UK-based Biwater Services Limited unit to MWH Global.

Owensboro, Kentucky (named after Abraham Owen, a Shelby County legislator killed in the Battle of Tippecanoe) is served by Owensboro Municipal Utilities, which provides power to almost 26,000 customers and water to 24,500. The city-owned utility operates water treatment facilities and a power plant that uses coal and used tires for fuel. Its operating divisions are Elmer Smith power plant, Engineering & Operations, Water Production, and Customer Service Center. It also offers telecommunications services. Owensboro Municipal Utilities is overseen by the five-member Owensboro Utility Commission, which is appointed by the mayor of Owensboro.

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