| Adams Electric Cooperative, Inc. (PA) |
| AEP Texas Central Company(TX) |
| AEP Texas North Company (TX) |
| AEP-Public Service Co. of Oklahoma (OK) |
| AEP-SWEPCO (AR, LA, TX) |
| Alabama Power Company (AL) |
| Alliant Energy (IL, IA, MN, WI) |
| Ameren (IL, MO) |
| Appalachian Electric Cooperative (TN) |
| Arizona Public Service (AZ) |
| Atlantic City Electric (NJ) |
| Austin Energy (TX) |
| Azusa Light & Power (CA) |
| Bath Electric, Gas, & Water Systems (NY) |
| Benton Public Utility District (WA) |
| Boone Electric Cooperative (MO) |
| Bowling Green Municipal Utilities (KY) |
| Brigham City Light & Power (UT) |
| Bristol Tennessee Essential Services (TN) |
| Brownsville Public Utilities Board (TX) |
| Buckeye Rural Electric Cooperative (OH) |
| Burbank Water and Power (CA) |
| Carthage Water & Electric (MO) |
| CenterPoint Energy (TX) |
| Central Vermont Public Service (VT) |
| Central Wisconsin Electric Cooperative (WI) |
| Chelan County PUD (WA) |
| Chugach Electric Association (AK) |
| Citizens' Electric Company (PA) |
| City of Anaheim Public Utilities (CA) |
| City of Batavia Municipal Electric Utility (IL) |
| City of Lompoc Utility Services (CA) |
| City of Naperville (IL) |
| City of Redding Electric Utility (CA) |
| City of Rocky Mount (NC) |
| City of Tallahassee Electric (FL) |
| City of Westerville Electric Division (OH) |
| City Utilities of Springfield (MO) |
| City Water, Light & Power (IL) |
| Clark Public Utilities (WA) |
| Cleco Power LLC (LA) |
| Cleveland Utilities (TN) |
| Clinton Utilities Board (TN) |
| Colorado Springs Utilities (CO) |
| Columbia Water & Light Department (MO) |
| ComEd (Exelon) (IL) |
| Consolidated Edison Company of New York (NY) |
| Consolidated Electric Cooperative Inc. (OH) |
| Cookeville Electric Department (TN) |
| Corn Belt Energy (IL) |
| Crawford Electric Cooperative (MO) |
| Cuivre River Electric Cooperative (MO) |
| Cuyahoga Falls Electric Department (OH) |
| Delmarva Power and Light (DE, MD) |
| Detroit Edison (MI) |
| Duck River Electric Membership Corporation (TN) |
| Dyersburg Electric Systems (TN) |
| East Central Energy (MN, WI) |
| Edmond Electric (OK) |
| Entergy Corporation (AR, LA, MS, TX) |
| Eugene Water & Electric Board (OR) |
| First Electric Cooperative Corporation (AK) |
| First Energy Corporation (OH, PA, NJ) |
| Florida Keys Electric Cooperative (FL) |
| Florida Power & Light Company (FL) |
| Gaffney Board of Public Works (SC) |
| Gainesville Regional Utilities (FL) |
| Georgia Power Company (GA) |
| Golden Valley Electric Association (AK) |
| Hutchinson Utilities Commission (MN) |
| Idaho Power Company (ID, OR) |
| Independence Power & Light (MO) |
| Indianapolis Power & Light Co. (IN) |
| ITC Midwest (IA, MN, IL) |
| ITC Transmission (MI) |
| Joe Wheeler Electric Membership (AL) |
| Johnson City Power Board (TN) |
| Kansas City Power & Light (MO, KS) |
| Knoxville Utilities Board (TN) |
| Lakeland Electric (FL) |
| Lansing Board of Water & Light (MI) |
| Lincoln Electric System (NE) |
| Long Island Power Authority (NY) |
| Los Angeles Dept. of Water & Power (CA) |
| Madison Gas & Electric Company (WI) |
| Massena Electric Department (NY) |
| Matanuska Electric Association (AK) |
| MidAmerican Energy Company (IA, IL, NE, SD) |
| Mishawaka Utilities Electric Division (IN) |
| Montana-Dakota Utilities Company (MT,ND,SD,WY) |
| Morristown Utility Systems (TN) |
| Nashville Electric Service (TN) |
| National Grid USA (NY, NH, MA, RI) |
| Nebraska City Utilities (NE) |
| Nebraska Public Power District (NE) |
| Northern Indiana Public Service Company (IN) |
| NSTAR (MA) |
| Ocala Electric Utility (FL) |
| OG & E Electric Services (AR, OK) |
| Oklahoma Electric Cooperative (OK) |
| Omaha Public Power District (NE) |
| Oncor Electric Delivery (TX) |
| Orange & Rockland Utilities (NY, NJ, PA) |
| Orlando Utilities Commission (FL) |
| Owensboro Municipal Utilities (KY) |
| Pacific Gas & Electric Company (CA) |
| PacifiCorp (CA, ID, OR, UT, WA, WY) |
| Pasadena Water & Power (CA) |
| PECO Energy (PA) |
| Peninsula Light Company (WA) |
| People's Electric Cooperative (OK) |
| PEPCO (D.C.) |
| Pierce Pepin Cooperative Services (WI) |
| Pioneer Electric Cooperative (OH) |
| PPL Corporation (PA) |
| Progress Energy (FL) |
| Provo City Power (UT) |
| Public Service Company of New Mexico (NM) |
| Puget Sound Energy (WA) |
| Ralls County Electric Cooperative (MO) |
| Rappahannock Electric Cooperative (VA) |
| Richland Electric Cooperative (WI) |
| Richland Energy Services (WA) |
| Riverside Public Utility Department (CA) |
| Ruston Light & Power (LA) |
| Sacramento Municipal Utility District (CA) |
| Salt River Project (AZ) |
| San Diego Gas & Electric Company (CA) |
| San Luis Valley Rural Electric Co-op (CO) |
| Shawano Municipal Utilities (WI) |
| Snohomish County PUD (WA) |
| Southern California Edison Company (CA) |
| Stoughton Utilities (WI) |
| Sumter Electric Cooperative (FL) |
| Tacoma Power (WA) |
| Tampa Electric (FL) |
| Union Power Cooperative (NC) |
| Upper Peninsula Power Company (MI) |
| Vectren Energy Delivery (IN) |
| Vermont Electric Power Company (VT) |
| Vernon Electric Cooperative (WI) |
| Waverly Light & Power (IA) |
| Wayne-White Counties Electric Cooperative (IL) |
| We Energies (MI,WI) |
| Westar Energy (KS) |
| Wisconsin Public Services Corporation (MI,WI) |
| Xcel Energy (CO, MN, WI, MI, ND, SD, NM, TX) |
