Utility:

Ameren Energy Resources
Ameren Illinois
Aqua Illinois, Inc.
Bartlett Services, Inc.
City of Bushnell
City of Geneseo
City of Oglesby
City of Peoria
City of Peru
City of Princeton
City of Sullivan
Clean Coal Solutions
Corn Belt Energy
 

Dynegy Midwest Generation
Enerstar Power Coop
Exelon
Frontier Communications
IBEW Local 146
IBEW Local 197
IBEW Local 601
Illinois American Water
Illinois Power Holdings
Menard Electric Coop
MJM Coop
NECA-IBEW Benefits Administration Assn.

OPCMIA Local 143
Spoon River Coop
University of Illinois
Village of Arthur
Village of Chatham
Village of Ladd
Village of Rantoul
Village of Riverton
Wireless USA
WMBD-TV

Construction:

Aclara Technologies
Acrux Cabling
Advances Electric Co.
Aldrige Electric
Asplundh Construction
Asplundh Power
Asplundh Tree Expert
Atlantic Transformer
Big D
Binion U.G. Utilities
Bodine Electric
Broadway Electric
Capital Electric
Champaign Signal & Lighting
Coon Tree Service
Corix
Custom Underground
Davenport Electric
Davey Tree
DMCO
Egizii Electric, Inc.
Electric Power Systems
Endrizzi
Engel Electric Co.
Ficek Electric
Gaylord Construction, Inc.
Gilbert Companies
GST Power Service Group
Haverfield Corporation
Henkels & McCoy

High Country
Hoerr Construction
Hooper
Infonet Communication
Intren, Inc./Trench It
J. F. Edwards
J. F. Electric
J. H. Moore, Inc.
JMS Electric, Inc.
John Burns Construction Co.
Kafer Tiling and Ditching
Kent Power Services, LLC
L. E. Myers
LaFore
Land Services
Laser Electric
Lil Rock Electric Construction, Inc.
Longfellow Drilling
Michels Power
Midwest Access Solutions
Miller Construction
M.J. Electric
Muller & Pribyl Utilities
Myers Mechanics
Nelson Tree
Oil Field Tree Service
Oberlander Electric Services, Co.
Okie-MO, Inc.
PAR Electric
Perlay Cable

Pieper Line
PMI Energy Solutions
Power Services Group, Inc.
Quick Electric
Raw Construction
Risser Electric
Rogers Helicopters
Ruff Electric
Sachs Electric
Serco Management Services
Shade Tree
Sonoma Underground Services
Suarez Electric Co.
Sullivan Electric
T&F Construction
T&T Inc.
Tecam Electric
Tel Assist Comm Services, Inc.
Thorne Electric
Three Phase Line Construction
Trans-Elect, Inc.
Tri-City Electric
Tru Check, Inc.
Underground Solutions, LLC
Utility Dynamics Corporation
Utility Service & Maintenance
Van-Mack
Wilson Construction Co.
Wright Tree