- AES Corporation (2)
- Allegheny Energy (2)
- Alliant Energy
 - Provides electric, natural gas, water, and steam services to customers worldwide. - Ameren
- Serves electric and natural gas customers throughout Missouri and Illinois.
- American Electric Power (AEP) (3)
- APS Energy Services
- Offers energy and energy-related products and services to the commercial, industrial, and residential markets in the western U.S.
- APX, Inc.
- Provides solutions and services for energy, renewable, carbon, and environmental markets.
- Arizona Public Service
- Offers energy and electric services for residences and businesses in the Southwest.
- Avista Corporation (3)
- Black Hills Corporation
- Diversified holding company with fuel production, energy marketing, and power generation operations.
- Bonneville Power Administration@
- Burmeister
- Includes utility products, online ordering, and list of manufacturers.
- Calpine Corporation (1)
- Caltex Energy
- Provides natural gas, electricity, and energy services to businesses in California.
- Caribbean Utilities Company, Ltd.
- Supplier and distributor of electricity to Grand Cayman.
- Central Vermont Public Service Corporation (1)
- Chimney Rock Public Power District (CRPPD)
- Publicly owned rural electric distribution system serving Morrill, Scottsbluff, and small parts of Banner, Sioux, and Box Butte Counties in the Nebraska panhandle.
- Cinergy (1)
- Con Edison Company of New York
- Providing electricity, natural gas, and steam service to New York City and Westchester County.
- Connecticut Valley Electric Exchange (CONVEX)
- Links the generating and transmission facilities of the electric utilities serving all of Connecticut and the western half of Western Massachusetts.
- ConnectMyElectricity
- Order your electricity service quickly and easily with ConnectMyElectricity.com.
- Dawson Public Power District
- Serving central Nebraska. Site offers online meter reading, links for kids, and more.
- Dayton Power & Light Co. (1)
- Detroit Edison
- Investor-owned electric utility serving customers in southeastern Michigan.
- DQE, Inc. (1)
- DTE Energy (3)
- Duke Energy (4)
- Eastern Utilities
- EDP Electricidade de Portugal Group
- Electricity operator and multidisciplinary organisation including telecommunications and Internet services.
- El Paso Electric
- Generates and distributes electricity to customers in the Rio Grande Valley in west Texas and southern New Mexico.
- ElectricNet OnLine Directory
- Buyer's guide and marketplace for electrical power professionals with information on products, services, events, and organisations.
- Empire District Electric Company
- Investor-owned utility providing electric service to customers in southwest Missouri, southeast Kansas, northeast Oklahoma, and northwest Arkansas.
- Endesa
- Generates, transports, and distributes electricity.
- Enel SpA
- Generates, transmits, and distributes electricity.
- Energiselskabet Arke
- Energiforsyning, elforsyning, lokalvarme, elbiler, solceller, varmepumper, energirådgivning
- Entergy Corporation (1)
- Exelon Corporation
- Generator and provider of natural gas, coal, hydro, nuclear, solar, and wind-generated electricity. Parent company of PECO and ComEd (Commonwealth Edison).
- First Energy Services
- Deregulated energy utility offering electricity, natural gas, and telecommunications services to both commercial and residential customers.
- FirstEnergy (2)
- Florida Power & Light
- Investor-owned utility providing electric power throughout Florida.
- Florida Public Utilities Company
- Distributing natural and propane gas, electricity, and water to different areas in Florida.
- GPU, Inc.
- Provides utility and utility-related services.
- Great Plains Energy
- Engages in the generation, transmission, distribution, and sale of electricity.
- Green Mountain Power Corp (3)
- Hafslund ASA
- Owns and operates power plants in Norway and in the U.S.
- Hawaiian Electric Industries
- Huaneng Power International
- Develops, constructs, operates, and manages thermal power plants.
- Hunt Power
- Functions as a project development organisation, seeking opportunities in the utility marketplace.
- IDACORP, Inc. (5)
- Idaho Power
- Provides electric service to residential and business customers in southern Idaho, eastern Oregon, and northern Nevada.
- Illinois Power Company
- Energy services holding company.
- International Power
- Independent power producer active in all phases of the power generation chain.
- IPALCO Enterprises, Inc.
- Holding company for Indianapolis Power and Light Company and Mid-America Capital Resources, which generates, transmits, distributes, and sells electricity.
- ista North America
- Provides consumption-dependent billing of energy, water and ancillary costs. Offers services to the multifamily, commercial, and military industries.
- LG&E Energy Corp@
- Maine Public Service Company
- Electric utility company serving Northern Maine.
- MDU Resources Group, Inc. (4)
- MGE Energy
- Distributes electricity to residential, commercial, and industrial customers in southern Wisconsin.
- MidAmerican Energy Holdings Company (2)
- Minnesota Power Inc.
- Diversified utility company with operations in electric operations, water services, automobile services, and investments.
- Municipal Electric Systems of Oklahoma (MESO)
- Public power utility.
- National Grid Group
- Specialises in the provision of electricity transmission and in building telecommunications networks.
- New Century Energies
- A holding Company for PSCo and SPS, is engaged in the generation, purchase, transmission, distribution and sale of electricity and in the purchase, transmission, distribution, sale and transportation of natural gas.
- New York Independent System Operator (NYISO)
- Albany-based operator of New York's transmission system.
- NiSource
- Holding company whose operating units engage in virtually all phases of the natural gas business.
- Northeast Utilities (2)
- Northern States Power (1)
- Northwestern Energy
- Produces and sells energy and related services and products.
- NStar (2)
- Oklahoma Gas & Electric (1)
- Orion Power Holdings
- Provider of wholesale power, gas, and energy services.
- Otter Tail Corporation (3)
- Pacific Gas and Electric
- Provides natural gas and electric service to customers in northern and central California.
- PacifiCorp (1)
- PG&E Corporation (4)
- Pinnacle West Capital Corp (3)
- Potomac Electric Power Company (PEPCO)
- Delivers electricity to homes and businesses in the District of Columbia and its Maryland suburbs.
- PowerGen PLC@
- PPL Corporation (4)
- Progress Energy (4)
- Public Service Company of New Mexico (PNM) (1)
- Public Service Enterprise Group@
- Puget Sound Energy
- Delivers electricity, natural gas, and other energy solutions.
- Reliant Resources
- Provider of electricity and energy services to wholesale and retail customers.
- Rochester Gas and Electric
- Provides electric and gas energy and related services in upstate New York.
- SCANA Corporation (1)
- Scottish Power PLC@
- Seattle City Light
- Electric utility serving the local metro area.
- ServiceOne
- Providing appliance repair, home warranty, heating and cooling, service contracts.
- Sierra Pacific Power Company
- Local electric and gas utility serving customers throughout northern Nevada and northeastern California.
- SmartEnergy.com
- Electricity and natural gas services to residential and small business customers online. Offers bill presentment, payment options, and 24-hour account access.
- Southern Company (4)
- Tennessee Valley Authority (3)
- Texas Genco
- Wholesale electric power generating company.
- TNP Enterprises, Inc.
- Holding company whose subsidiaries provide electricity and energy services in Texas and New Mexico.
- TransAlta Corporation
- Electric energy utility with operations in Canada, New Zealand, Australia, and the United States.
- Tucson Electric Power Company (2)
- UGI Corporation (2)
- UIL Holdings Corporation (2)
- UniGridEnergy.com
- Online energy marketplace for electricity trading and transmission services. Learn of bids or offers anywhere, anytime, using pagers, faxes, or e-mail.
- Unitil Systems, Inc (2)
- USDA Rural Utilities Service (RUS)@
- UtilityStore.com, The
- Provides brand name revenue grade electric watthour meters, metering related products, and current and voltage transformers.
- Vanyo Incorporated
- Distributor of power products to the electric utility industry.
- Weather and Electricity Demand Forecast
- Sells temperature and power demand forecasts for major power companies in the continental United States.
- Western Resources (1)
- WhiteFence Index, The
- See how much people are paying for their utilities across the United States at WhiteFence Index.
- Wisconsin Energy Corporation
- Holding company with a portfolio of subsidiaries engaged in electric generation, electric, gas, steam, and water distribution, pump manufacturing, and other non-utility businesses.
- WPS Resources Corporation@
- Wygen
- Energy generation unit involved in the wholesale generating and selling of electric power and energy.
- Xcel Energy
- Utility company serving electricity and natural gas customers.
- Connectiv
- Provides electric service to customers in southern New Jersey, Delaware, and the Eastern Shore of Maryland and Virginia.
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