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Alliant Energy Elliott Company Public Service of Oklahoma
American Atlas Entergy Puget Sound Energy
Baltimore Gas & Electric Keyspan Energy Puerto Rico Electric Power
BPDS (Bangladesh) Korea Electric Reliant Energy
Brazos Electric MidAmerican Energy Co. South Carolina Elec. & Gas Co.
Bryan Municipal Utilities Municipality of Anchorage Southern Company
Cedar Falls Utilities Nevada Power Tampa Electric Co.
Central Iowa Power Corp. North Indiana Pub Service Co. Texaco
Cinergy Northern California Power Authority Tractebel Power, Inc.
City of Medicine Hat Northern States Power Co. Tri State
City of Tallahassee NRG TurboCare
City of Vineland Pacific Corp. University of Texas
Colorado Energy Management Philadelphia Electric Vectren
Connective Potomac Electric Power West Texas Utilities
Consol. Electric Power Asia Power Gen Westinghouse
Consolidated Edison PPG Industries, Inc. Wood Group
Duke Energy PPL Xcel Energy
El Paso Energy PSE&G Yazoo City Utilities