ARKANSAS
Centerpoint Energy Arkla
CALIFORNIA
City of Long Beach, Pacific Gas & Electric (PG&E), San Diego Gas & Electric, Southern California Gas Company (SoCalGas)
COLORADO
Atmos Energy, Xcel Energy
CONNECTICUT
Connecticut Natural Gas, Southern Connecticut Gas, Yankee Gas Service Company
DELAWARE
Delmarva, Chesapeake Utilities – Natural Gas
FLORIDA
Central Florida Gas, Florida City Gas, Florida Public Utilities, Gulf South, Lake Apopka Natural Gas, Peoples Gas System
GEORGIA
Atlanta Gas & Light Company
ILLINOIS
Ameren Illinois – Zone 1, Ameren Illinois – Zone 2, Ameren Illinois – Zone 3, Commonwealth Edison – ComEd, Nicor Gas, Northshore Gas, Peoples Gas
INDIANA
Nipsco, Vectren Corporation
KANSAS
Atmos Energy
LOUISIANA
Centerpoint Energy Arkla, Gulf South
MAINE
Unitil – Northern Territories
MARYLAND
BG&E, Chesapeake Utilities, Columbia Gas of MA (Formerly Bay State Gas), Washington Gas & Light
MASSACHUSETTS
Columbia Gas of MA (Formerly Bay State Gas), Fitchburg Gas & Electric Light Company (Unitil), National Grid, NSTAR, New England Gas, Washington Gas & Light
MICHIGAN
Consumers Energy, DTE – Detroit Edison, Michigan Consolidated Gas Company (Michon), MGU – Michigan Gas Utilities, SEMCO Energy
MINNESOTA
Centerpoint Energy, Excel Energy, Minnesota Energy Resources
MISSOURI
Laclede Natural Gas, Missouri Gas Energy
MISSISSIPPI
Gulf South
NEW HAMPSHIRE
National Grid, Unitil
NEW JERSEY
Elizabethtown, New Jersey Natural Gas (NJNG), Public Service Electric & Gas (PSE&G), South Jersey Gas (SJG)
NEW MEXICO
Public Service of New Mexico
NEW YORK
Central Hudson Gas & Electric, Con Edison, National Fuel Gas Company (NFG), National Grid – Long Island, National Grid – New York City, National Grid – Upstate NY (Niagra Mohawk), NYSEG, Orange & Rockland, RG&E
NORTH CAROLINA
Piedmont Natural Gas Company, PSNC Energy (a SCANA Company)
OHIO
AEP Columbus Southern, Columbia Gas of Ohio, Dayton Power & Electric, Dominion East Ohio, Duke Energy (Cincinnati), Illuminating Company (Cleveland & NE), Ohio Edison (Sandusky), Northeast Ohio Gas, Toledo Edison, Vectren Corporation
OKLAHOMA
Centerpoint Energy, Oklahoma Natural Gas
PENNSYLVANIA
Columbia Gas of Pennsylvania, Dominion Peoples, National Fuel Penn, Peoples Natural Gas of PA, UGI Central Penn Utilities, UGI Penn Natural Gas, Philadelphia Electric, Philadelphia Gas Works
RHODE ISLAND
National Grid Rhode Island
SOUTH CAROLINA
Piedmont Service Area, SCE&G
TEXAS
AEP, Atmos Energy, Centerpoint Energy, Gulf South, Oncor, Sharyland, TNMP
VIRGINIA
Columbia Gas of Virginia, Virginia Natural Gas, Washington Gas & Light
WASHINGTON DC
Washington Gas & Light
WEST VIRGINIA
Dominion Hope
WYOMING
Cheyenne Light & Fuel