| Company | City | Service Type | Products |
| Big Sky Custom Solar | East Helena | Residential, | Solar Electric (pv), |
| Bozeman Green Build | Bozeman | Residential, | Solar Electric (pv), |
| Homestead Alternatives | Belgrade | Residential, | Solar Electric (pv), |
| Moab solar power | Moab | Residential, | Solar Electric (pv), |
| Montana Radiant | Missoula | Residential, | Solar Electric (pv), |
| Montana Solar Works | Fromberg | Commercial, | Solar Electric (pv), |
| Natural Housebuilders | Victor | Residential, Commercial, | Solar Electric (pv), Wind Power, |
| New Era Plumbing and Heating | Missoula | Residential, | Solar Hot Water (thermal) |
| Oasis Montana | Stevensville | Residential, Commercial, | Solar Electric (pv), Wind Power, |
| Onsite Energy | Bozeman | Residential, | Solar Electric (pv), |
| Palmer Electric Technology Energy Services, Inc. P.E.T.E.S | Missoula | Residential, | Solar Electric (pv), |
| Planetary Systems | Ennis | Residential, | Solar Electric (pv), |
| Remote Power Systems | Stevensville | Residential, | Solar Electric (pv), |
| SBS Solar | Missoula | Residential, Commercial, | Solar Electric (pv), Wind Power, |
| Solar Montana | Helena | Residential, | Solar Electric (pv), |
| Solar Plexus | Missoula | Residential, | Solar Electric (pv), |
| Thirsty Lake Solar | Bozeman | Residential, ,Commercial, | Solar Electric (pv), |
