Basin Electric Cooperative
Billings Generation Inc.
MDU Resources
NorthWestern Energy
PPL Montana
Rosebud Energy

City of Helena
Idaho State University
Malmstrom Air Force Base
Montana Department of Environmental Quality
Montana State University
University of Montana

F.H. Stoltze Land & Lumber
Freres Lumber Co., Inc.
Idaho Forest Group
Interfor US
Plum Creek Timber Co.
Roseburg Forest Products
Stimson Lumber
Thompson River Lumber

Hollingsworth & Vose
PCC Structurals, Inc.

Ash Grove Cement
Barretts Minerals
Columbia Falls Aluminum
Genesis Alkali
Graymont Western U.S.
Holcim (US) Inc.
Montana Resources
Montana Limestone
Westmoreland Resources

Calumet Montana Refining, Great Falls
CHS, Inc., Billings
ExxonMobil, Billings
Holly Frontier
Phillips66, Billings
Marathon, El Paso
Valero, Benicia

Cargill Environmental Finance
Evergreen Recycling, Inc.
Idahoan Foods
Luzenac America
MT Sulphur & Chemical Co.
FNF Construction
Knife River Construction

Oil & Gas
Agave Energy Company
Altamont Oil & Gas, Inc.
Anadarko Minerals, Inc.
Armstrong Operating
Ballard Petroleum
Bayswater Exploration & Production
Behm Energy Company
Belle Fourche Pipeline Co.
Bridger Pipeline, LLC
Bruin E&P Operating, LLC
Burlington Resources, LLC
Carrell Oil Company
ConocoPhillips Company
Contango Resources, Inc.
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
Enerplus Resources
Energy Corporation of America
Equinor Energy, LLC
Equinor Pipelines, LLC
Fidelity Exploration & Production Co.
G3 Operating, LLC
Halcon Resources Corp.
Havre Pipeline
Hawley and Desimon Oil Company
Hess Corporation
Hiland Partners
Hunt Oil Company
Jones Energy LTD
Kraken Oil & Gas, LLC
Legacy Reserves Operating
Midcon Energy Partners, LLC
Missouri Basin Well
Missouri River Royalty Corp.
Montalban Oil and Gas Co.
Mountainview Energy
National Oilwell Varco
Nearburg Production Company
Panther Creek Resources
Quicksilver Resources, Inc.
Saga Petroleum
Samson Oil & Gas Limited
Shakespeare Oil and Gas, LLC
Slawson Exploration Company
Statoil O&G, LP
Summit Gas Gathering
True Oil, LLC
Upton Resources (PennWest)
Washakie Midstream Services, LLC
WBI Energy
Western Gas Resources
Whiting Oil and Gas Corporation
Williams Explorations & Productions
WPX Energy, Inc.
XTO Energy Inc.
Zenergy, Inc.
Zenergy Operating Company