| Company | City | Service Type | Products |
| 621 Energy, | Acton | Residential, | Solar Electric (pv), |
| Absolute Green Energy | Worcester | Commercial, | Solar Electric (pv), |
| Adam Quenneville Roofing and Siding | South Hadley | Residential, | Solar Electric (pv), |
| Advanced Electrical Contracting | Winchendon | Residential, | Solar Electric (pv), |
| Advanced Energy Systems Development | Wellesley | Residential, | Solar Electric (pv), |
| Advanced Mechanical Systems, Inc. | Stow | Residential, | Solar Electric (pv), |
| Alpine Solar Heat and Hot Water | Windsor | Residential, Commercial, | Solar Hot Water (thermal) |
| Alterate Energy Center | Plymouth | Residential, | Solar Electric (pv), |
| Alteris Renewables | Springfield | Residential, | Solar Electric (pv), |
| American Capital Energy | North Chelmsford | Residential, | Solar Electric (pv), |
| Asidaco, LLC | Boston | Residential, | Solar Electric (pv), |
| ATC Solar | Boylston | Residential, ,Commercial, | Solar Hot Water (thermal) |
| Avid Solar | Holden | Residential, | Solar Electric (pv), |
| BASK Power | Belchertown | Residential, ,Commercial, ,Municipal, | Solar Electric (pv), Solar Hot Water (thermal), Wind Power, |
| Beaumont Solar Company | New Bedford | Residential, | Solar Electric (pv), |
| Berkshire Photovoltaic Services | Adams | Residential, | Solar Electric (pv), |
| Blue Selenium Solar – Sandwich | Sandwich | Residential, | Solar Electric (pv), |
| Blue Selenium Solar – Woburn | Woburn | Residential, | Solar Electric (pv), |
| Boston Solar | Lynn | Residential, | Solar Electric (pv), |
| BPVS | Adams | Residential, | Solar Electric (pv), |
| Brightstar Solar | Marlborough | Residential, ,Commercial, | Solar Electric (pv), |
| Cazeault Solar | Osterville | Residential, | Solar Electric (pv), |
| Certified Safe Electric | Marshfield | Residential, ,Commercial, | Solar Electric (pv), Solar Hot Water (thermal), |
| Clean Energy Design | North Falmouth | Residential, | Solar Electric (pv), |
| Conservation Services Group | Westborough | Residential, | Solar Electric (pv), |
| Cotuit Solar | Cotuit | Residential, | Solar Electric (pv), |
| Country Comfort Heating & Cooling | Dracut | Residential, Commercial, | Solar Electric (pv), Solar Hot Water (thermal), Solar Pool Heating, |
| Country Energy Solutions – Gardner | Gardner | Residential, | Solar Electric (pv), |
| D&D Electrical Contractors, Inc. | Woburn | Residential, | Solar Electric (pv), |
| D&D Solar Electric Installations | Woburn | Residential, | Solar Electric (pv), |
| E2 SOLAR | Hyannis | Residential, | Solar Electric (pv), |
| Falcon Solar | Bedford | Residential, | Solar Electric (pv), |
| Falmouth Solar | Teaticket | Residential, | Solar Electric (pv), |
| GeoSun Design | Greenfield | Residential, Commercial, | Solar Electric (pv), |
| Go Green Industries | Westford | Residential, | Solar Electric (pv), |
| Gotsun-gosolar | Seekonk | Residential, | Solar Electric (pv), |
| Green in Green | West Hatfield | Residential, | Solar Electric (pv), |
| Groom Energy Solutions | Salem | Residential, | Solar Electric (pv), |
| I.n.o. Electrical Service Inc. | Assonet | Residential, | Solar Electric (pv), |
| JV Mechanical Contractors | Webster | Residential, | Solar Electric (pv), |
| Light Energy Solar | Quincy | Residential, | Solar Electric (pv), |
| LittleFoot Energy | Somerville | Residential, | Solar Hot Water (thermal) |
| Macdougall Plumbing And Mechanical Llc | Milton | Residential, | Solar Electric (pv), |
| Marchetti Engineering | Fitchburg | Residential, | Solar Electric (pv), |
| Mark Allen Electric & Solar | Arlington | Residential, | Solar Electric (pv), |
| Mass Renewables Inc | Bellingham | Residential, ,Commercial, | Solar Electric (pv), Solar Hot Water (thermal), |
| McCrohan Electrical | Berkley | Residential, | Solar Electric (pv), |
| Mercury Solar Systems -Waltham | Waltham | Residential, | Solar Electric (pv), |
| Moss Hollow Solar | Lunenburg | Residential, | Solar Electric (pv), |
| Munro Distributing Co. Inc. | Fall River | Residential, | Solar Electric (pv), |
| Nailman Construction | Rockland | Residential, | Solar Electric (pv), |
| New Day Energy | Kingston | Residential, | Solar Electric (pv), |
| New England Breeze Solar | Hudson | Residential, | Solar Electric (pv), |
| New England Clean Energy HOT | Hudson | Residential, ,Commercial, ,Municipal, | Solar Electric (pv), Solar Hot Water (thermal), |
| New England Solar Hot Water | Duxbury | Residential, | Solar Hot Water (thermal) |
| Nexamp | North Andover | Commercial, ,Utilities, ,Municipal, | Solar Electric (pv), |
| Next Level Realty | Worcester | Commercial, | Solar Electric (pv), |
| NorthEast Solar Design | Amherst | Residential, | Solar Electric (pv), |
| PV Squared | Greenfield | Residential, | Solar Electric (pv), |
| Ralco Electric, Inc. | Westport | Residential, | Solar Electric (pv), |
| Renewable Energy Systems | North Scituate | Residential, | Solar Electric (pv), Solar Hot Water (thermal), |
| S & H Construction | Cambridge | Residential, ,Commercial, | Solar Electric (pv), Solar Hot Water (thermal), |
| Second Generation Energy | Hopedale | Residential, | Solar Electric (pv), |
| Singleton Plumbing | Manchester | Residential, | Solar Electric (pv), Solar Hot Water (thermal), |
| Sirois Electric | Burlington | Residential, | Solar Electric (pv), |
| Skyline Solar – Hingham | Hingham | Residential, | Solar Electric (pv), |
| Solar City – Marlborough | Marlborough | Residential, | Solar Electric (pv), |
| Solar Connection | Swansea | Residential, | Solar Hot Water (thermal) Solar Pool Heating, |
| Solar Design Associates | Harvard | Residential, | Solar Electric (pv), |
| Solar Edison | Topsfield | Residential, | Solar Electric (pv), |
| Solar Installation, Llc | Raynham | Residential, | Solar Electric (pv), |
| Solaradiant | Lowell | Residential, | Solar Electric (pv), |
| SolarCity – Marlborough | Marlborough | Residential, ,Commercial, | Solar Electric (pv), |
| SolarFlair Energy | Hopkinton | Residential, | Solar Electric (pv), |
| SolarOne Solutions | Framingham | Commercial, | Solar Electric (pv), |
| Southcoast Greenlight | Swansea | Residential, | Solar Electric (pv), |
| Southpoint | Leominster | Residential, | Solar Electric (pv), |
| Spire Solar Systems | Bedford | Commercial, ,Municipal, | Solar Electric (pv), |
| St Electric Llc | Norwood | Residential, | Solar Electric (pv), |
| Sun Path Green Energy Solutions | Leominster | Residential, | Solar Electric (pv), |
| SunBug Solar | Somerville | Residential, | Solar Electric (pv), |
| Sunlight Solar Energy, Inc. – Waltham | Waltham | Residential, | Solar Electric (pv), |
| Sunwind, Llc – Brewster | Brewster | Residential, | Solar Electric (pv), |
| Sunwind, Llc – Orleans | Orleans | Residential, | Solar Electric (pv), |
| Titan Electric Corp | Peabody | Residential, | Solar Electric (pv), |
| Transformations, Inc. | Townsend | Residential, | Solar Electric (pv), |
| United Solar Associates | Maiden | Residential, | Solar Electric (pv), |
| United Solar Associates LLC | Maiden | Commercial, | Solar Electric (pv), |
| US Solar Works | Attleboro | Residential, ,Commercial, | Solar Electric (pv), |
| Vanguard Energy Partners – Boston | Boston | Residential, | Solar Electric (pv), |
| Waldman Plumbing & Heating, Inc | Lynn | Residential, | Solar Electric (pv), |
| Waldman Plumbing And Heating | Lynn | Residential, | Solar Hot Water (thermal) |
| Zapotec Energy | Cambridge | Residential, ,Commercial, ,Municipal, | Solar Electric (pv), Solar Hot Water (thermal), |
