Constellation Energy Group, Inc., through its subsidiaries, supplies energy products and services in North America. The company operates in three segments: Merchant Energy, Regulated Electric, and Regulated Gas. The Merchant Energy segment owns, operates, and maintains fossil, nuclear, and renewable generating facilities, and holds interests in nuclear generating facilities, qualifying facilities, and power projects. It also provides operation and maintenance services, including testing and start-up, to owners of electric generating facilities. In addition, this segment offers products and services to meet the energy requirements of wholesale and retail customers, including distribution utilities, cooperatives, aggregators, and commercial, industrial, and governmental customers. As of December 31, 2009, it had a total generation capacity of 7,118 megawatts. The Regulated Electric segment purchases, transmits, distributes, and sells electricity in central Maryland. It maintained approximately 240 substations, 1,300 circuit miles of transmission lines, and 24,500 circuit miles of distribution lines. The Regulated Gas segment purchases, transports, and sells natural gas in central Maryland. Constellation Energy Group also designs, constructs, and operates renewable energy, heating, cooling, and cogeneration facilities; offers energy performance contracting and energy efficiency engineering services; provides home improvements, service electric and gas appliances, service heating, air conditioning, plumbing, electrical, and indoor air quality systems, as well as offers natural gas marketing to residential customers in central Maryland; and develops and deploys new nuclear plants in North America through its joint venture. The company was founded in 1906 and is based in Baltimore, Maryland.

Pacific Northern Gas (PNG) provides natural gas in west-central and northeastern British Columbia. The utility serves more than 39,100 residential, commercial, and industrial customers over its transmission and distribution system. Its large industrial customers include timber company West Fraser and metals maven Rio Tinto Alcan. In 2008 these customers accounted for about 26% of PNG's annual total gas deliveries and more than 5% of its revenues. British Columbia Hydro and Power Authority (BC Hydro) is also a major customer. Most of PNG's customers buy gas directly from producers or suppliers but contract with PNG to have it pipelined to them. Pacific Northern Gas Ltd. entered the renewable power business in 2010.

Created by Texas ranchers and business owners, Pedernales Electric Cooperative provides electricity services in the Texas Hill Country. The company, the largest electric cooperative in the US, purchases its electricity from wholesale providers, primarily the Lower Colorado River Authority (LCRA), and transmits and distributes it to more than 234,000 customers. The member-owned cooperative is purchasing wind-power assets from American Electric Power to expand its green energy sources. In 2008 a scandal over alleged inappropriate expenditures by board members led to the resignation of the board president and intense scrutiny of the co-op by the public, members, and the government. Created by Texas ranchers and business owners, Pedernales Electric Cooperative provides electricity services in the Texas Hill Country. The company, the largest electric cooperative in the US, purchases its electricity from wholesale providers, primarily the Lower Colorado River Authority (LCRA), and transmits and distributes it to more than 234,000 customers. The member-owned cooperative is purchasing wind-power assets from American Electric Power to expand its green energy sources. In 2008 a scandal over alleged inappropriate expenditures by board members led to the resignation of the board president and intense scrutiny of the co-op by the public, members, and the government.

GAIL (India) Limited is no blowhard when it comes to turning energy into profits. The largest gas transmission and marketing company in India, GAIL owns more than 6,700 km of pipeline and has a 78% market share in India's natural gas transmission business. It has seven gas processing units and owns India's largest gas-based petrochemicals complex. In addition, GAIL has major domestic exploration and production operations. It also has a fiber-optic cable network of 13,000 km that provides bandwidth to telecommunications carriers. It is also involved in liquefied natural gas import projects. In 2010 GAIL (India) Limited expressed an interest in buying US shale assets. The government of India owns 57% of the company.

Wahlco likes to keep it clean. It designs and manufactures air pollution control equipment, specializing in ammonia handling, flue gas conditioning, nitrogen oxide control equipment which it installs at power plants and other industrial facilities, including cement plants, oil and gas refineries, pulp and paper mills, and steel mills. Wahlco also makes products such as low-watt density heaters and specialty thermocouples for industrial applications. The company's systems and equipment can be found in more than 500 locations in more than 17 countries. Wahlco was founded by a small group of experts in 1972.

OGE Energy is the holding company for the largest electric utility in Oklahoma, but its largest revenue producer is its energy marketing and natural gas transmission unit, OGE Energy Resources. OGE owns Oklahoma Gas and Electric (OG&E), a public utility with almost 777,000 retail and wholesale customers in Oklahoma (including Oklahoma City) and a bit of western Arkansas. OG&E owns coal- and gas-fired power plants that generate 6,420 MW of capacity. Subsidiary Enogex operates 7,900 miles of natural gas gathering and transportation pipeline. The company also provides physical, asset, financial management services through marketing unit OGE Eenergy Resources.

El Paso Electric Company, a public utility company, engages in the generation, transmission, and distribution of electricity primarily in west Texas and southern New Mexico. It principally operates nuclear, natural gas, and coal power plants, as well as purchases power. The company also operates wind turbines. As of December 31, 2009, it owned 6 electrical generating facilities with a net generating capacity of approximately 1,643 megawatts. The company served approximately 370,000 residential, commercial, industrial, public authority, and wholesale customers. It sells its products to electric utilities and power marketers, as well as to oil, copper refining, and steel production facilities, and the United States military installations. The company was founded in 1901 and is based in El Paso, Texas.

Degremont designs, builds, and operates water treatment plants worldwide to purify water and treat wastewater. The company has operations in more than 70 countries, and its plants provide more than 1 billion people with potable water. It is a specialist in designing and constructing facilities for seawater desalination by the means of reverse osmosis. It also designs and builds sludge treatment facilities. In the US the group operates through subsidiary Infilco Degremont. United Water formed a joint venture with Infilco Degrement in 2009 to operate a Water Environmental Research Center in Richmond,Virginia.

A company so nice they named it twice is doubling its efforts to deliver power. NRG Energy, a leading power producer with a generating capacity of about 24,500 MW (including 345 MW from renewable energy), is moving onward and upward. The vast majority of NRG's power plants are in North America, but it also has one in Australia and one in Germany. The company's global portfolio includes about 190 generation units at 47 power plants. It also markets natural gas, oil, and other commodities, and invests in district heating and cooling and alternative energy projects. Its retail unit, Reliant Energy, distributes power to more than 1.6 million residential, business, commercial, and industrial customers in Texas.

Avista Corporation, an energy company, engages in the generation, transmission, and distribution of energy and energy-related businesses in the United States and Canada. The company operates through two segments, Avista Utilities and Advantage IQ. The Avista Utilities segment engages in the generation, transmission, and distribution of electric energy primarily from hydroelectric and thermal sources. This segment also distributes natural gas to retail customers in parts of eastern Washington, northern Idaho, and parts of northeast and southwest Oregon, as well as engages in wholesale purchase and sale of electricity and natural gas. As of December 31, 2009, it provided retail electric service to approximately 356,000 customers; and retail natural gas service to approximately 316,000 customers. This segment offers electricity and natural gas to residential, commercial, and industrial customers. The Advantage IQ segment provides utility expense management solutions to assess and manage utility costs and usage to multi-site companies in North America. It offers invoice processing, auditing and payment services, energy procurement, reporting, and advanced analysis, as well as provides analytical support, reporting, and consulting services. In addition, Avista’s other investments and operations include sheet metal fabrication of electronic enclosures, parts, and systems for the computer, telecom, renewable energy, and medical industries; real estate investments, primarily commercial office buildings; and investments in venture capital funds and low income housing. The company was founded in 1889 and is headquartered in Spokane, Washington.

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