- Schlumberger
 - Global oilfield and information services company with major activity in the energy industry. - Enron (19)
- Browse a collection of web sites concerning the services, people, and history of Enron.
- Dominion
- Provides electricity, natural gas, and related services to customers in the Midwest, Mid-Atlantic, and Northeast regions of the U.S.
- E.ON
- Integrated power and gas company. E.ON is an investor-owned energy service provider.
- Aquila
- Multinational risk merchant with a focus on natural gas, power, and a variety of risk management and custom energy products.
- TXU Corporation
- TXU is a holding company which, through its subsidiaries, engages in the generation, purchase and distribution of electricity and the processing, transmission, distribution, and marketing of natural gas. Also engages in power development and telecommunications.
- GE Power Systems
- Offers products and services across the power generation, oil and gas, transmission and distribution, distributed power, and energy rental industries.
- Siemens Energy & Automation
- Electrical, engineering and automation solutions, products, software, and services to the industrial, manufacturing, and construction industries
- Wiliams Energy Services
- Offers services in the areas of natural gas, petroleum, energy marketing, trading and finance, and retail energy.
- Dynegy
- Services include energy convergence, marketing of NGL's, transmission and distribution of natural gas and electricity, and telecommunications services in North American and the U.K.
- Sasol
- Comprised of diversified fuel, chemical, and related manufacturing and marketing operations, complemented by interests in technology development and oil and gas exploration and production.
- CenterPoint Energy
- International energy services and delivery company.
- Edison International
- Family of companies that develops, acquires, finances, owns, operates, and maintains reliable and efficient power systems around the world.
- CMS Energy Corporation
- Involved in oil and gas exploration, production and distribution, independent power development, and electric and gas utility operations.
- Sempra Energy
- The Sempra Energy companies develop energy infrastructure, operate utilities, and provide related products and services to consumers in the United States, Europe, Canada, Mexico, South America, and Asia.
- Ameresco
- North American energy services company with subsidiaries that include Ameresco Canada, Ameresco Solutions, and Citizens Conservation Services.
- GrandBasin
- Offers hosted workspace for exploration and production companies.
- Northern Power Systems
- Design, engineering, and installation of on-site power systems including remote power, distributed generation, and microgrid hybrid renewable energy.
- International Resources Group
- A management consulting firm specialising in environment and natural resources management, energy and disaster relief services.
- Mirant
- Integrates electricity generation and distribution, management of gas assets, fuel procurement, and marketing of energy and energy-linked commodities.
- South Jersey Industries, Inc.
- Natural gas distribution, sales, transportation, and energy management.
- SK Corporation
- Involved in petroleum refining, oil exploration and production, LPG, coal mining, lubricants, and more.
- WPS Resources Corporation (4)
- Australian Gas Light Company (AGL)
- Provides electricity, natural gas, and LPG products and services to homes and businesses.
- Tractebel, S.A.
- Specialises in the trading, tranmission, distribution, and sale of electricity and natural gas.
- Con Edison
- Provides a range of energy-related products and services to customers through its subsidiaries.
- Dresser-Rand Company
- Offers centrifugal and reciprocating compressors, gas and steam turbines, expanders, and control systems.
- FPL Group
- National energy company operating principally through its Florida Power & Light subsidiary.
 Bord na Móna
- Supplies peat as a fuel for the generation of electricity.- NRG Energy
- Engaged in the acquisition, development, operation, and maintenance of power generation facilities.
- Husky Energy
- Integrated energy and energy-related company, involved in the production and distribution of crude oil, natural gas, and sulphur and petroleum coke.
- GromCo
- Learn what electricity and natural gas suppliers are offering in the deregulated energy industry. Offers a gas balancing service for energy marketers.
- McDermott International
- Worldwide energy services company whose subsidiaries operate in marine construction services, power generation systems, and government operations.
- Ormat
- Develops and manufactures modular power plants that use energy from locally available sources such as geothermal, waste heat, biomass, solar, and low grade fuels. Also produces remote microturbine power units.
- TECO Energy
- Holding company with subsidiaries engaged in electricity production, transportation, mining,exploration, independent power generation, & advanced energy management & communications systems.
- Sierra Pacific Resources
- Investor-owned corporation with operating subsidiaries engaged in energy and utility services.
 UK Power
- Directory of U.K. power gas and electricity suppliers, and utility advisors.- Neste Group
- Finnish oil, energy and chemical company with operations in over 30 countries worldwide.
- Equitable Resources
- Energy exploration, production, transmission, distribution and marketing company.
- Intelligent Energy
- Focusing on achieving technology leadership in hydrogen generation, fuel storage, and power generation.
- Taresen
- Provider of energy and utility services in Western Canada and the U.S. Pacific Northwest.
- blackEnergy
- Offering energy co-ops that support African American nonprofits using members' utility bills.
- Wasserkraft Volk AG
- Manufacturers of small and medium sized water power stations and turbines.
- Hammonds
- Manufacturing fuel additives, fuel quality products and fluid additive injector systems.
- Ergon
- Manufactures, markets, and transports asphalt, asphalt emulsions, and speciality oils. Also working in environmental assessment, design, and engineering.
- Matrix Service Company
- Offers design, construction, inspection services, maintenance and repair services, products, and solutions for aboveground storage tanks and plant facilities.
- Energy East Corporation
- Diversified energy services company providing electricity and gas delivery and energy management services to retail and wholesale customers in the Northeastern U.S.
- Innogy Holdings
- Core businesses include energy production, retail, services provision, operations, engineering, and technology.
- PetroChem Inspection Services
- Offers nationwide inspection services in the refining and petrochemical industries. Also supplies outsourced inspection and NDE services.
- Essential
- Reselling energy and communications services.
- Covanta Energy
- Developer, owner, and operator of power generation projects and provider of related infrastructure services.
- Masefield Group
- Specialists in crude oil, condensates, and oil trading, oil futures, and price risk management.
- Rural Energy Enterprises
- Distributes stoves, sealed combustion, and water heaters, offers webspecials.
- Maxol Ireland
- Major supplier of retail motor fuels, heating oil and commercial fuel oils in the Republic of Ireland.
- Tenaska, Inc.
- An international power development company and energy marketer.
- Repsol YPF
- Engages in exploration, development, and production of crude oil and natural gas; transport of oil products, liquefied petroleum, and natural gas; and oil refining and production of petrochemicals.
- Power Direct
- Offers electricity service and related energy products and services for home or business.
- Preferred Utilities Manufacturing Corp.
- Manufacturer of combustion systems and burners, instrumentation, data acquisition systems, and fuel handling systems for industrial, institutional, and commercial power plants.
- CrystaTech
- Supplier of process technology to the energy industry and licensor of CrystaSulf hydrogen sulfide removal technology.
- Norweb Energi
- Supplies gas and electricity.
- Pacific Enterprises
- Los Angeles-based utility holding company whose principal subsidiary is Southern California Gas Co.
- Ely Energy
- Manufacturers of synthetic natural gas products, LPG cylinder filling systems, and thermal denox products.
- Global Energy Decisions
- Holding company investing in energy information companies. Includes news, updates, and portfolio snapshots.
- PG&E National Energy Group
- Provider of gas transmission, energy trading, and power generation services.
- Caldwell Energy and Environmental, Inc.
- Turnkey provider of turbine inlet cooling, heating, thermal energy systems, stacks, and deionized water tanks for the power and process air industries.
- International Energy Services Company (IESCO)
- Provides nondestructive examination and analysis services to the petroleum, petrochemical, and power industries.
- NDE Associates, Inc.
- Providing non-destructive (NDT) eddy current testing, ultrasonic testing, and remote field eddy current testing to the petrochemical and power industries.
- Aurora Power Resources, Inc.
- Offers Alaskan energy resources, including natural gas.
- Cheapest Gas & Electricity UK
- Provides consumers the ability to compare gas and electricity prices from utility suppliers in the U.K.
- Petroleum and Refractory, Inc.
- Provides hydrotesting, refractory inspection, tank inspection, and consulting services for the petro-chemical industry.
- Transco Affordable Warmth
- Aims to help remove fuel poverty from about a million homes and implement training for up to 10,000 newly skilled people.
- Novus Engineering, P.C.
- Specialising in energy-related systems, fuel and electricity procurement, and lighting audits.
- Bridas Corporation
- Independent energy company with a focus on crude oil and natural gas exploration, development, and production in North and South America and Central Asia.
- Oneok Energy Marketing & Trading
- Provides energy trading, risk management, retail energy, and wellhead services for natural gas and electricity markets.
- Numanco Group
- Provides multi-disciplinary staff augmentation support as well as equipment based solutions to the commercial and fossil energy sectors.
- Norwegian Energy (UK)
- For individuals and organisations in oil and oil related industries.
- Standard Alcohol Company
- Established to patent, demonstrate, and commercialize fuel systems which are clean, powerful, and biodegradable
- Electric Fuels Corporation
- A diversified energy company providing rail, marine and energy services.
- Maxim Energy Group Ltd.
- Developer of power generation projects and technologies in Europe and Canada.
- Combined Power Systems
- Providers of combined heat and power services.
- Energy Velocity
- Provides information and intelligence on the energy industry including data on electric power, generation, and transmission as well as fuels such as natural gas, coal, and more.
- Kawasaki Gas Turbines
- Provides gas turbines for standby generator sets, co-generation, and combined-cycle generator sets.
- ConocoPhillips
- Integrated energy company.
- British Energy@
- Jones Oil Products
- Provider of oil products in Ireland with 18 depots around the country. Supplies all household and business fuel requirements.
- Pure Energy Resources
- Pure Energy Resources works with customers to formulate reliable energy and generation infrastructure solutions, including all aspects of project valuation and acquisition. Also offers expertise in greenfield development.
- Wood Group
- International energy services company provides a range of engineering, production support, maintenance management and industrial gas turbine overhaul and repair services to the oil and gas, and power generation industries worldwide.
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