• ALLIANT ENERGY
  • ALLEGHENY POWER
  • AMERADA HESS
  • AMGEN INC.
  • ANCHORAGE WATER/WASTEWATER
  • ANR PIPELINE COMPANY
  • ATCO ELECTRIC
  • ARIZONA ELECTRIC POWER
  • ARIZONA PUBLIC SERVICE
  • AUSTIN ENERGY
  • AVISTA UTILITIES
  • BALTIMORE GAS & ELECTRIC
  • BARBADOS LIGHT & POWER
  • BOSTON GAS COMPANY
  • BP AMOCO
  • BP AMERICA PRODUCTION
  • BP EXPLORATION, SCOTLAND
  • BP PAKISTAN EXPLORATION & PRODUCTION
  • BP PIPELINES, INC (NORTH AMERICA)
  • BROWARD COUNTY
  • BUFFALO SEWER AUTHORITY
  • CAJUN ELECTRIC
  • CALPINE CORPORATION
  • CAPGEMINI ENERGY
  • CAPE MAY COUNTY
  • CAPITAL MTA
  • CAPITAL REGIONAL DISTRICT, B.C., CANADA
  • CAROLINA POWER & LIGHT
  • CHELAN COUNTY PUD
  • CINERGY
  • CITY OF ATLANTA
  • CITY OF CORPUS CHRISTI
  • CITY OF CHESAPEAKE
  • CITY AND COUNTY OF SAN FRANCISCO
  • CITY OF COQUITLAM
  • CITY OF DALLAS WATER UTILITIES
  • CITY OF FORT WORTH
  • CITY OF LAKELAND
  • CITY OF PORTLAND
  • CITY OF PASADENA
  • CITY OF SAN MARCOS
  • CITY OF SURREY
  • CITY OF WESTMINSTER
  • CLARK COUNTY SANITATION DIST.
  • CLP POWER HONG KONG
  • COLORADO SPRINGS UTILITIES
  • COLUMBIA GAS TRANSMISSION
  • COMMONWEALTH EDISON
  • CONNEXUS ENERGY
  • CONSOLIDATED EDISON
  • COOPERATIVE POWER
  • CORDOVA ENERGY
  • COVANTA ENERGY
  • DAIRYLAND POWER COOPERATIVE
  • DC WASA
  • DELAWARE DEPARTMENT OF TRANSPORTATION
  • DENVER WATER DEPARTMENT
  • DISTRICT OF COLUMBIA WATER AND SEWER AUTHORITY
  • DTE ENERGY/DETROIT EDISON
  • DUKE ENERGY CORPORATION
  • DUQUESNE LIGHT
  • DYNEGY CORPORATION
  • EAST BAY MUNICIPAL UTILITY (EBMUD)
  • EAST KENTUCKY POWER
  • EL PASO CORPORATION
  • ENBRIDGE PIPELINES
  • ENTERGY
  • EON, USA
  • EQT MIDSTREAM
  • ESKOM
  • FLINT HILLS RESOURCES
  • FLORIDA POWER & LIGHT ENERGY
  • FORT WORTH WATER DEPT
  • FPL ENERGY SEABROOK STATION
  • GE ENERGY
  • GRAND RIVER DAM AUTHORITY
  • GRANT COUNTY PUD
  • GREAT RIVER ENERGY
  • HETCH HETCHY WATER AND POWER
  • HYDRO-QUEBEC
  • INTERNATIONAL POWER
  • JACKSONVILLE ELECTRIC AUTHORITY
  • KANSAS CITY BOARD OF PUBLIC UTILITIES
  • KAYPAR ENERGY VENTURES
  • KENTUCKY UTILITIES
  • KEYSPAN ENERGY
  • KOCH PIPELINE COMPANY, LP
  • L.A. COUNTY PUBLIC WORKS
  • LAKELAND ELECTRIC
  • LAWRENCE BERKELEY LAB
  • LONG ISLAND RAILROAD
  • LOS ANGELES DEPT OF WATER & POWER
  • LOUISVILLE GAS & ELECTRIC
  • LOWER COLORADO RIVER AUTHORITY
  • MARYLAND DEPT OF TRANSPORTATION
  • MASS WATER RESOURCES AUTHORITY
  • MATEP, LLC
  • MERIDIAN TECHNOLOGIES
  • METRO WATER DISTRICT, SOUTHERN CALIFORNIA
  • METRO WATER DISTRICT, ST. LOUIS
  • MID AMERICAN ENERGY COMPANY
  • MIGHTY RIVER POWER
  • MINNESOTA POWER
  • MIRANT
  • NATIONAL GRID
  • NAVY PUBLIC WORK CENTER
  • NISOURCE, INC
  • NEW YORK POWER AUTHORITY
  • NORTH ATLANTIC ENERGY SERVICE
  • NORTH ATLANTIC REFINING
  • NORTHERN INDIANA POWER SERVICES
  • NOVA SCOTIA POWER INC.
  • NRG ENERGY
  • OGLETHORPE POWER CORP
  • ONONDAGA COUNTY DEPT DRAINAGE AND SANITATION
  • ORANGE COUNTY UTILITIES
  • PALM BEACH COUNTY
  • PENN STATE UNIVERSITY
  • PEPCO
  • PEOPLES ENERGY
  • PILGRIM NUCLEAR POWER PLANT
  • PINNACLE WEST ENERGY
  • PINELLAS COUNTY UTILITIES
  • PORTLAND GENERAL ELECTRIC
  • POTOMAC ELECTRIC POWER COMPANY
  • POWERGEN, TRINIDAD & TOBAGO
  • PROGRESS ENERGY
  • REEDY CREEK ENERGY
  • SACRAMENTO REGIONAL WASTEWATER
  • SAINT JOHNS RIVER POWER PARK
  • SALT RIVER PROJECT
  • SAN DIEGO COUNTY WATER
  • SAN FRANCISCO PUBLIC UTILITIES COMMISSION
  • SANTEE COOPER
  • SARASOTA COUNTY
  • SEABROOK NUCLEAR POWER STATION
  • SEATTLE CITY LIGHT
  • SEMPRA ENERGY UTILITIES
  • SONOMA COUNTY WATER
  • SOUTH CAROLINA ELECTRIC & GAS
  • SOUTHERN CALIFORNIA GAS CO
  • SOUTHERN COMPANY SERVICES
  • SOUTH MISSISSIPI ELECTRIC POWER ASSOC.
  • TARRANT REGIONAL WATER DISTRICT
  • TENNESSEE GAS PIPELINE
  • TENNESSEE VALLEY AUTHORITY
  • TEXAS GENCO
  • TEXAS TECH UNIVERSITY HEALTH SERVICES
  • TMPA
  • TRINITY RIVER AUTHORITY
  • TUCSON ELECTRIC & POWER
  • TXU ELECTRIC & GAS
  • UNITED ILLUMINATING
  • UNITED POWER ASSOCIATION
  • UNIVERSITY OF DELAWARE
  • UNIVERSITY OF SOUTH CAROLINA
  • U.S. ARMY CORPS OF ENGINEERS
  • U.S. BUREAU OF RECLAMATION
  • WESTECH INTERNATIONAL
  • WESTERN AREA POWER ADMINISTRATION
  • WINDSOR UTILITIES
  • XCEL ENERGY