- Absoloka Coal Mine
- Albertsons Stores
- Ashland, MT Water District
- Big Sky, MT Water District
- City of Billings, MT
- Billings School District
- City of Bozeman, MT
- City of Buffalo, WY
- Burlington Northern Santa Fe Railroad
- Cenex Harvest States
- Colorado Energy Management
- City of Colstrip, MT
- Colstrip School District
- ConocoPhillips
- Cust-o-fab
- D.H. Blattner
- Electrical Consultants, Inc (ECI)
- enXco
- EPC Services
- Exxon Mobil
- Fort Peck, MT Water District
- City of Gillette, WY
- City of Glendive, MT
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- Integrated Service Co.
- Invenergy
- Langlas & Associates
- City of Lewiston, MT
- Lockwood, MT Water District
- M.A. Mortenson
- Montana-Dakota Utilities
- Montana Department of Transportation
- Montana Power Company
- Montana State University
- NaturEner
- North Dakota Water Commission
- Northwestern Energy
- PPL-MT
- PPL-MT Hydo
- Spring Creek Coal Company
- Sterling Construction Management
- United Parcel Service
- US Department of Defense
- US Forest Service
- Walmart Stores
- Wanzek Construction
- Westmorland Coal Company
- Yellowstone County
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