Alabama: | Huntsville Utilities Mobile Gas Service North Alabama Gas District Wheeler Basin |
Arizona: | Southwest Gas Corporation Unisource Energy Services
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Arkansas: | Arkansas Oklahoma Gas Black Hills Energy CenterPoint Energy (Arkla) |
California: | California Gas Transmission Co Pacific Gas & Electric (PG&E) San Diego Gas & Electric South California Gas Company
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Colorado: | Atmos Energy Black Hills Energy Colorado Natural Gas Colorado Springs Utilities Xcel Energy (PSCO) |
Georgia: | Liberty Utilities |
Illinois: | Ameren (CIPS, CILCO, IP) Jo Carroll Energy MidAmerican Energy Nicor North Shore Peoples Gas Rock Energy Cooperative |
Indiana: | Citizen's Gas NIPSCO Ohio Valley Gas Sycamore Gas Company Vectren
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Iowa: | Alliant Black Hills Energy MidAmerican Energy Liberty Utilities |
Kansas: | Atmos Energy Kansas Gas Service Black Hills Energy Midwest Energy |
Kentucky: | Atmos Energy Columbia Gas Delta Natural Gas Company Duke Energy Louisville Gas & Electric
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Louisiana: | CenterPoint Energy (Arkla) CenterPoint Energy (Entex) |
Michigan: | Consumers Energy DTE Energy (MichCon) Michigan Gas Utilities SEMCO Energy Gas Company Citizen's Gas Fuel Company |
Minnesota: | CenterPoint Energy (MN Gas) Minnesota Energy Resources Xcel Energy
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Mississippi: | Atmos Energy CenterPoint Energy (Entex)
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Missouri: | Ameren Atmos Energy Empire Laclede Gas Company Liberty Utilities Missouri Gas Energy Southern Missouri Gas Summit Natural Gas
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Montana: | Northwestern Energy |
Nebraska: | Black Hills Energy MidAmerican Energy Northwestern Energy
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Nevada: | Southwest Gas |
New Mexico: | New Mexico Gas Company |
North Carolina: | Piedmont Natural Gas Company PSNC |
Ohio: | Columbia Gas Dominion East Ohio Dominion West Ohio Duke Energy Vectren Energy |
Oklahoma: | Arkansas Oklahoma Gas CenterPoint Energy (Arkla) Oklahoma Natural Gas |
South Carolina: | Piedmont Natural Gas Company |
South Dakota: | MidAmerican Energy Northwestern Energy |
Tennessee: | Atmos Mid-State Chattanooga Gas Company Memphis, Light, Gas & Water Piedmont Natural Gas Company
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Texas: | Atmos Energy Atmos West Texas CenterPoint Energy (Entex) Texas Gas Services WesTex Energy LLC
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Utah: | Questar Gas Company |
Virginia: | Roanoke Gas Company |
Wisconsin | Alliant Antigo City Gas Madison Gas & Electric Midwest Natural Gas St. Croix Gas Superior Water, Light & Power WE-Energies Wisconsin Public Service Xcel Energy |
Wyoming: | Black Hills Energy |