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AEP - Central Power & Light
AEP - Public Service Company of Oklahoma
AEP - Southwestern Electric Power
AES - Central Illinois Lighting Company
AES - Indianapolis Power and Light
Alliant Energy - IES Utilities
Alliant Energy - Wisconsin Power & Light
Ameren - Central Illinois Public Service
Avista
BC Hydro
CH Energy - Central Hudson Electric & Gas
China Light & Power
Cinergy
City Electric System of Key West
City of Cleveland, OH
City of Riverside, CA
City of Tacoma, WA
City Public Service, TX
Cobb EMC
Conectiv - Atlantic Electric
Conectiv - Delmarva Power
Dominion Resources - Virginia Power
Duke Energy - Duke Power
Dynegy - Illinois Power
Empire District Electric
Energy East - Rochester Gas & Electric
Entergy - Arkansas Power & Light
Entergy - Gulf States Utilities
Entergy - Mississippi Power & Light
Etobicoke Hydro
Exelon - PECO Energy
First Energy - Cleveland Electric Illuminating
First Energy - Jersey Central Power and Light
First Energy - Metropolitan Edison
First Energy - Ohio Edison
First Energy - Pennsylvania Electric
First Energy - Pennsylvania Power
First Energy - Toledo Edison
Gainesville Regional Utilities
Hawaiian Electric
Jackson Utility Division
KeySpan Energy - Long Island Power Authority
Knoxville Utilities Board
LG&E Energy - Kentucky Utilities
Mercury Energy
MidAmerican Energy
Modesto Irrigation District
National Grid USA - Niagara Mohawk
New Braunfels Utilities
NiSource - Northern Indiana Public Service
Northern Virginia Electric Cooperative
NSTAR - Boston Edison
NSTAR - Cambridge Electric Light
NSTAR - Commonwealth Electric
OGE Energy - Oklahoma Gas & Electric
Pinnacle West - Arizona Public Service
PPL Utilities
Progress Energy - Carolina Power & Light
Progress Energy - Florida Power
Public Service Electric & Gas
Puerto Rico Electric Power Authority
Rappahannock Electric Cooperative
Reliant Energy - Houston Light & Power
Sask Power
SCANA - South Carolina Electric and Gas
Southern Company - Alabama Power
Southern Company - Mississippi Power
Southern Maryland Electric Cooperative
Texas-New Mexico Power
TXU - Texas Utilities
United Illuminating Co
Utilicorp United
Vectren - Southern Indiana Gas & Electric
We Energies
Xcel Energy - Public Service of Colorado
Yorkshire Electricity

*ASI client list is not comprehensive, representative sample only.