- American Petroleum Institute
 - Trade association representing the U.S. petroleum industry including exploration and production, transportation, refining, and marketing. - Besche Oil Company
- Waldorf - Offering oil for heating and cooling, including automatic oil delivery.
- Burch Oil Company
- Charles County - Providing oil heating and cooling, including automatic oil delivery.
- DeYoung and Associates, Inc.
- Springfield - Offers software and services for the propane gas industry.
- Edlow International
- Services include transportation management, licensing, and other aspects of the nuclear fuel cycle.
- Foster Associates, Inc.
- Bethesda - Provides economic analysis, consulting, and forecasts to electric utilities and natural gas companies.
- Fowler Energy Company
- Silver Spring - Provides utility, gas, electricity procurement services, and other energy consulting services.
- MetroGen
- Potomac - Aggregates existing standby generators and sells their output to the electric grid for maintaining reliability.
- Moore Associates, Inc.
- Energy and telecommunications consulting firm that specializes in assisting clients meet the new challenges of increasing deregulation.
- National Rural Utilities Cooperative Finance Corporation
- Herndon
- NG Magazines
- Arlington - Edited and produced by the top natural gas publisher, NG Magazine focuses on specific insights about buying and selling natural gas.
- Pace Global Energy Services
- Fairfax - Provides energy management, procurement, and risk management services to industrials, commercial facilities, independent power producers, and utilities.
- Petroleum Finance Co.
- Consulting services specializing in the financial, strategic, commercial, and political aspects of the international oil and gas industry.
- Petroleum Marketers Association of America (PMAA)
- Arlington
- Washington Gas@
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