ENERGY
Basin Electric Cooperative
Billings Generation Inc.
NorthWestern Energy
PPL Montana
Rosebud Energy
Southern MT Electric G&T

GOVERNMENT
Idaho State University
Malmstrom Air Force Base
Montana State University

LUMBER
F.H. Stoltze Land & Lumber
Plum Creek Timber Co.
Roseburg Forest Products Services, Inc.
Stimson Lumber

MINING
ASARCO
Ash Grove Cement
Barretts Minerals
Columbia Falls Aluminum
Graymont Western U.S.
Holcim (US) Inc.
Westmoreland Resources

OTHER
Cargill Environmental Finance
Evergreen Recycling, Inc.
Idahoan Foods
Luzenac America
MT Sulphur & Chemical Co.

O&G
Agave Energy Company
Altamont Oil & Gas, Inc.
Anadarko Minerals, Inc.
Armstrong Operating
Bayswater Exploration & Production
Behm Energy Company
Belle Fourche Pipeline Co.
Burlington Resources, LLC
Carrell Oil Company
CHS Inc.
ConocoPhillips Company
Continental Resources, Inc.
Crusader Oil & Gas Company
Denbury Resources
Dakota-3 E&P, LLC
Devon Energy
Eagle Oil & Gas Company 
Eighty Eight Oil Co.
Encore Acquisition
ExxonMobil
Havre Pipeline
Hawley and Desimon Oil Company
Hess Corporation
Hiland Partners
Hunt Oil Company
Jones Energy LTD
MCR, LLC
Missouri Basin Well
Missouri River Royalty Corp.
Montalban Oil and Gas Co.
Montana Refining Co.
Mountainview Energy
Panther Creek Resources
Quicksilver Resources, Inc.
Saga Petroleum
Shakespeare Oil and Gas, LLC
True Oil, LLC
Upton Resources (PennWest)
Western Gas Resources
Williams Explorations & Productions
WPX Energy, Inc.
XTO Energy Inc.
Zenergy, Inc.
Zenergy Operating Company