- AGL Resources
 - Regional energy services holding company whose business units include utility operations, midstream energy services, telecommunications infrastructure, and energy investments. - Alliant Energy
- Provides electric, natural gas, water, and steam services to customers worldwide.
- Ameren
- Serves electric and natural gas customers throughout Missouri and Illinois.
- Atmos Energy Corporation (2)
- Chesapeake Utilities Corporation (3)
- Cinergy@
- Con Edison Company of New York
- Providing electricity, natural gas, and steam service to New York City and Westchester County.
- Consolidated Edison
- Provides a range of energy-related products and services to customers through its subsidiaries.
- CoServ
- Provides multiple utilities services.
- Dayton Power & Light Co.@
- First Energy Services
- Deregulated energy utility offering electricity, natural gas, and telecommunications services to both commercial and residential customers.
- Florida Public Utilities Company
- Distributing natural and propane gas, electricity, and water to different areas in Florida.
- Georgia Natural Gas
- Natural gas service provider of energy for residential and commercial customers throughout Georgia.
- LG&E Energy Corp (2)
- Marlin CNG Services
- Transporter of high pressure natural gas supplies from remote well locations to pipelines and industrial endusers.
- MGE Energy
- Distributes electricity to residential, commercial, and industrial customers in southern Wisconsin.
- 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 England Gas Company
- Natural gas distribution company.
- New Jersey Resources (4)
- NiSource
- Holding company whose operating units engage in virtually all phases of the natural gas business.
- Northern Border Partners
- Acquires, owns, and manages pipeline and other midstream energy assets.
- NorthWestern Corporation
- Distributes electricity and natural gas to customers in Montana, South Dakota, and Nebraska.
- Orange and Rockland Utilities (1)
- Peoples Energy
- Diversified energy company operating in gas distribution, power generation, midstream services, oil and gas production, and retail energy services.
- PG&E Corporation@
- Public Service Enterprise Group (2)
- Rochester Gas and Electric
- Provides electric and gas energy and related services in upstate New York.
- San Diego Gas & Electric Company@
- Semco Energy
- Energy and infrastructure company that distributes natural gas to customers in Michigan and Alaska.
- Southern California Gas Company@
- UGI Corporation@
- Unitil Systems, Inc@
- Vectren Corporation
- Provides energy and related applied technology solutions.
- Western Resources@
- Xcel Energy
- Utility company serving electricity and natural gas customers.
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