List of United States natural gas companies
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- Alabama
- Alaska
- Arizona
- California - City of Long Beach Department of Gas & Water, Pacific Gas & Electric, San Diego Gas & Electric, Southern California Gas
- Connecticut - Northeast Utilities (including Yankee Energy)
- Delaware - Northeast Utilities
- District of Columbia - Washington Gas
- Illinois - People's Natural Gas Company
- Maine - Bay State Gas, Northeast Utilities
- Maryland - Baltimore Gas & Electric, Northeast Utilities, Washington Gas
- Massachusetts - Bay State Gas, NSTAR, Northeast Utilities (including Western Massachusetts Electric Company/WMECO)
- Minnesota - Xcel Energy
- New Jersey - Northeast Utilities
- New Hampshire - Bay State Gas, Northeast Utilities
- New York - Northeast Utilities
- North Dakota - Xcel Energy
- Pennsylvania - Northeast Utilities
- Rhode Island - Northeast Utilities
- South Dakota - Xcel Energy
- Texas
- Vermont - Northeast Utilities
- Virginia - Washington Gas
- Washington - Puget Sound Energy
- West Virginia
- Wisconsin - Xcel Energy
- Wyoming