| AK - Golden Valley Electric Assn Inc |
| AL - Alabama Power Co. |
| AL - PowerSouth |
| AL - Tennessee Valley Authority |
| AR - AEP/SWEPCO |
| AR - Arkansas Electric Coop Corp. |
| AR - Arkansas Power & Light Co |
| AR - ENTERGY |
| AR - LS Power |
| AR - SWEPCO |
| AZ - Arizona Electric Power Coop Inc. |
| AZ - Arizona Public Service Co. |
| AZ - Salt River Proj AG I & P Dist |
| AZ - Salt River Project/Tuscon Electric Power |
| AZ - Tri-State Generation |
| AZ - Tucson Electric Power Co. |
| CA - AES Corporation |
| CA - Burbank City of |
| CA - CMS & Wellhead Electric |
| CA - Dynegy |
| CA - El Paso Energy Corp. |
| CA - Glendale City of |
| CA - Imperial Irrigation District |
| CA - Los Angeles City of |
| CA - LS Power |
| CA - NRG Energy |
| CA - Pasadena, City of |
| CA - PG&E Corp. |
| CA - San Diego Gas & Electric Co. |
| CA - Thermo Ecotek |
| CO - Arkansas Power & Light Co |
| CO - Colorado Springs City of |
| CO - Platte River Power Authority |
| CO - Public Service Co. of Colorado |
| CO - Tri-State G & T Assn Inc |
| CO - Xcel Energy |
| CT - NRG Energy |
| CT - PSEG |
| CT - United Illuminating Co |
| DC - Potomac Electric |
| DE - Calpine |
| DE - Dover, City of |
| DE - NRG Energy |
| FL - Duke Energy |
| FL - Fort Pierce Utilities Authority |
| FL - FPL Group |
| FL - Gainesville Regional Utilities |
| FL - GS Power Holdings |
| FL - Gulf Power Co |
| FL - Jacksonville Electric Authority |
| FL - Key West City of |
| FL - Lake Worth City of |
| FL - Lakeland City of |
| FL - NRG Energy |
| FL - Orlando Utilities Comm |
| FL - Seminole Electric Coop Inc |
| FL - Tallahassee City of |
| FL - Tampa Electric Co. |
| FL - Vero Beach City of |
| GA - Georgia Power Co. |
| HI - Hawaiian Electric Co Inc |
| IA - Alliant |
| IA - Ames City of |
| IA - Cedar Falls, City of |
| IA - Central Iowa Power Coop |
| IA - Corn Belt Power Coop |
| IA - Iowa Electric Light & Power Co. |
| IA - Iowa Power & Light Co. |
| IA - Iowa Southern Utilities Co. |
| IA - MidAmerican |
| IA - Muscatine Power & Light Dept. |
| IA - Pella City of |
| IL - Ameren Illinois |
| IL - Dynegy |
| IL - Electric Energy, Inc. |
| IL - Midwest Generation EME |
| IL - Peabody Energy |
| IL - Southern Illinois Power Coop |
| IL - Springfield Water Light & Power |
| IL - Tomcat Power |
| IN - American Electric Power |
| IN - Dominion |
| IN - Duke Energy |
| IN - Gary, City of |
| IN - Hoosier Energy Rural Electric Cooperative |
| IN - Indiana Michigan Power Co. |
| IN - Indianapolis Power & Light Co. |
| IN - Logansport City of |
| IN - Northern Indiana Public Service Co. |
| IN - Ohio Valley Electric |
| IN - Richmond Power & Light |
| IN - Vectren |
| KS - Centel Corp |
| KS - Coffeyville City of |
| KS - Empire District Electric Co |
| KS - Kansas City Board of Public Utilities |
| KS - Kansas City Power & Light Co. |
| KS - McPherson Board of Public Utilities, City of |
| KS - Midwest Energy Inc |
| KS - Sunflower Electric Power Coop. |
| KS - Western Resources, Inc. |
| KS - Winfield, City of |
| KY - American Electric Power |
| KY - E.ON U.S. |
| KY - East Kentucky Power Cooperative |
| KY - LG&E Energy |
| KY - Owensboro Municipal Utilities |
| KY - Tennessee Valley Authority |
| KY - Union Light Heat & Power |
| KY - Western Kentucky Energy |
| LA - AEP/SWEPCO |
| LA - Alexandria, City of |
| LA - Cleco |
| LA - Cleco Corp. |
| LA - ENTERGY |
| LA - Lafayette Utilities System |
| LA - Louisiana Generating |
| LA - Morgan City |
| LA - Natchitoches City of |
| LA - NRG Energy |
| LA - Opelousas City of |
| LA - Ruston Utilities |
| LA - Terrebonne Parish Gov't., Util. Dept |
| MA - Brayton Point Holdings |
| MA - Consolidated Edison |
| MA - Exelon |
| MA - First Light |
| MA - Footprint Power |
| MA - NRG Energy |
| MA - Taunton Municipal Lighting Plant |
| MD - AES Corporation |
| MD - Allegheny Energy Supply Co. |
| MD - Avenue Capital Group |
| MD - Constellation Energy Group |
| MD - NRG Energy |
| MD - Raven Power Holdings |
| ME - FPL Group |
| ME - NextERA Energy Resources |
| ME - PP&L Inc. |
| MI - Consumers Energy Co. |
| MI - Detroit Edison Co. |
| MI - Detroit, City of |
| MI - Grand Haven Board of Light and Power |
| MI - Holland, City of |
| MI - Lansing Board of Water and Light |
| MI - Marquette Board of Light and Power |
| MI - Michigan South Central Pwr Agy |
| MI - We Energies |
| MI - Wyandotte Municipal Serv Comm |
| MN - Allete |
| MN - Alliant |
| MN - Minnesota Power |
| MN - Otter Tail Power Co. |
| MN - Rochester Public Utilities Dept. |
| MN - Southern Minnesota Municipal Power |
| MN - Xcel Energy |
| MO - Ameren Missiouri |
| MO - Aquila |
| MO - Associated Electric Coop. |
| MO - Columbia Power & Light, City of |
| MO - Empire District Electric Co |
| MO - Independence Power & Light |
| MO - Kansas City Power & Light Co. |
| MO - Sikeston Board of Municipal Utilities |
| MO - Springfield, City Utilities of |
| MS - Choctaw Generation Ltd. |
| MS - ENTERGY |
| MS - Mississippi Power Co. |
| MS - PNG Corporation |
| MS - South Mississippi El Pwr Assn |
| MT - Centennial Power |
| MT - Montana Power Company |
| MT - Montana-Dakota Utilities Co. |
| MT - NorthWestern Energy |
| MT - PP&L Montana LLC |
| NC - Duke Energy |
| NC - Westmoreland Coal |
| ND - Basin Electric Power Coop. |
| ND - Great River Energy |
| ND - Minnkota Power Coop Inc. |
| ND - Montana-Dakota Utilities Co. |
| ND - Otter Tail Power Co. |
| NE - Fremont, City of |
| NE - Grand Island Utilities Dept. |
| NE - Hastings Utilities |
| NE - Nebraska Public Power Dist. |
| NE - Omaha Public Power Dist. |
| NH - Public Service Co. of New Hampshire |
| NJ - Calpine |
| NJ - GS Power Holdings |
| NJ - NRG Energy |
| NJ - Public Service Electric & Gas NJ |
| NJ - Rockland Capital |
| NJ - Vineland Municipal Electric Utility |
| NJ - Vineland, City of |
| NM - Arizona Public Service Co. |
| NM - El Paso Electric Co |
| NM - Pinnacle West |
| NM - Plaines Electric |
| NM - Public Service Co. of NM |
| NM - Southwestern Public Service Co. |
| NM - Texas-New Mexico Power Co |
| NV - Berkshire Hathaway |
| NV - Idaho Power |
| NV - Nevada Power |
| NV - Sierra Pacific Resources |
| NY - AES Corporation |
| NY - Castleton Commodities |
| NY - Consolidated Edison Co-NY Inc |
| NY - Helios Power Capital |
| NY - Jamestown Board of Public Utilities |
| NY - KeySpan Energy |
| NY - Market Span |
| NY - New York Power Authority |
| NY - NRG Energy |
| NY - Reliant Energy |
| NY - Rochester Gas & Electric Corp. |
| OH - AES |
| OH - American Electric Power |
| OH - American Municipal Power |
| OH - Buckeye Power |
| OH - Cleveland City of |
| OH - Dayton Power & Light Co. |
| OH - Duke Energy |
| OH - FirstEnergy |
| OH - Hamilton, City of |
| OH - NRG Energy |
| OH - Ohio Valley Electric |
| OH - Orrville City of |
| OK - Grand River Dam Authority |
| OK - OGE Energy |
| OK - Oklahoma Municipal Power Authority |
| OK - Public Service Co of Oklahoma |
| OK - Western Farmers Elec Coop Inc |
| OR - Portland General Electric Co |
| PA - AES Corporation |
| PA - Allegheny Energy Supply Co. |
| PA - Duquesne Light Co. |
| PA - Edison Mission Energy |
| PA - Edison Mission Energy (operated by NRG Energ |
| PA - Exelon |
| PA - FirstEnergy |
| PA - GenOn |
| PA - NRG Energy |
| PA - PP&L Inc. |
| PA - Robindale Energy Services |
| PA - Sunbury Generation LP |
| PA - Talen Energy |
| PA - UGI Utilities, Inc. |
| RI - Dominion |
| SC - Duke Energy |
| SC - Santee Cooper |
| SC - South Carolina Electric & Gas |
| SC - South Carolina Generating Co. |
| SD - Black Hills Power & Light |
| SD - Otter Tail Power Co. |
| SD - Xcel Energy |
| TN - Tennessee Valley Authority |
| TX - AEP/SWEPCO |
| TX - AES Corporation |
| TX - Austin Electric Dept., City of |
| TX - Brazos Electric Power Coop |
| TX - Brownsville Public Utils Board |
| TX - Bryan Utilities |
| TX - El Paso Electric Co |
| TX - ENTERGY |
| TX - Exelon |
| TX - Garland, City of |
| TX - Greenvile, City of |
| TX - International Power |
| TX - Lower Colorado River Authority |
| TX - LS Power/Dynegy |
| TX - Luminant Energy |
| TX - NRG Energy |
| TX - Optim Energy |
| TX - San Antonio City Public Services |
| TX - San Miguel Electric Coop Inc |
| TX - Sempra |
| TX - Southwestern Public Service Co. |
| TX - Texas GenCo |
| TX - Texas Municipal Power Agency |
| TX - Xcel Energy |
| UT - Deseret Generation & Transmission |
| UT - Los Angeles City of |
| UT - PacifiCorp |
| VA - American Electric Power |
| VA - Dominion |
| VA - Dominion Virginai Power |
| VA - NRG Energy |
| VA - Southern Energy International (SEI) |
| WA - Transalta Corp. |
| WI - Alliant |
| WI - Dairyland Power Cooperative |
| WI - DTE Energy |
| WI - Madison Gas & Electric Co |
| WI - Manitowoc Public Utilities |
| WI - We Energies |
| WI - Wisconsin Power & Light Co. |
| WI - Wisconsin Public Service Corp. |
| Wi - Xcel |
| WV - Allegheny Energy Supply Co. |
| WV - American Electric Power |
| WV - Dominion |
| WV - GenPower |
| WV - Mon Power |
| WV - Monongahela Power |
| WY - Basin Electric Power Coop. |
| WY - Black Hills Power & Light |
| WY - North American Power Group |
| WY - Rocky Mountain Power |