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AES - Central Illinois Lighting Company
AGL Resources - Atlanta Gas Light
AGL Resources - Virginia Natural Gas
Alliant Energy - IES Utilities
BC Gas Utility
Cinergy
Citizens Gas & Coke Utility
City Public Service, TX
Conectiv - Delmarva Power
Dominion Resources - East Ohio Gas
Dominion Resources - Hope Gas
DTE Energy - Michcon
El Paso Gas Pipeline
Jackson Utility Division
Knoxville Utilities Board
MidAmerican Energy
National Grid USA - Niagara Mohawk
NiSource - Columbia Gulf Transmission
NiSource - Northern Indiana Public Service
Questar Regulated - Mountain Fuel Supply
Reliant Energy - ARKLA
Reliant Energy - ENTEX
SCANA - Public Service of North Carolina
SCANA - South Carolina Electric and Gas
Sempra Energy - Southern California Gas
Southern Union - Providence Gas
Utilicorp United
Vectren - Southern Illinois Gas & Electric
Westcoast Energy - Centra Gas - Ontario
Westcoast Energy - Union Gas
Wisconsin Energy - Wisconsin Gas

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