| Company | City | Service Type | Products |
| 146 0 1 Kingspan Solar Inc | Jessup | Residential, | Solar Electric (pv), |
| 21st Century Power Solutions | Catonsville | Residential, | Solar Electric (pv), |
| Advanced Solar Technologies | Centreville | Residential, | Solar Electric (pv), |
| American Design and Build | Bel Air | Residential, | Solar Electric (pv), |
| American Power And Light | Bowie | Residential, | Solar Electric (pv), |
| Astrum Solar | Annapolis Junction | Residential, ,Commercial, | Solar Electric (pv), |
| AtisSun Inc | Edgewater | Residential, ,Commercial, | Solar Electric (pv), |
| Aurora Energy | Columbia | Residential, | Solar Electric (pv), |
| Banner Home Solutions | Mount Airy | Residential, | Solar Electric (pv), |
| Big D Electric | Cumberland | Residential, | Solar Electric (pv), |
| Bmore Green | Essex | Residential, | Solar Electric (pv), |
| Capital Sun Group | Cabin John | Residential, | Solar Electric (pv), |
| Earth And Air Technoologies | Reisterstown | Residential, | Solar Electric (pv), |
| Earth Sun Energy Systems | Hyattsville | Residential, | Solar Electric (pv), |
| EastWest Solar HOT | Laurel | Residential, ,Commercial, ,Utilities, ,Municipal, | Solar Electric (pv), |
| Energy One Corp | Rosedale | Residential, | Solar Electric (pv), |
| Evolve Energy Systems | Buckeystown | Residential, | Solar Electric (pv), |
| Generated Power Systems | Germantown | Residential, | Solar Electric (pv), |
| Glory Energy Solutions | Boonsboro | Residential, ,Commercial, | Solar Electric (pv), |
| Glory Energy Solutions.inc | Frederick | Residential, | Solar Electric (pv), |
| Green Energy Design | Easton | Residential, | Solar Electric (pv), |
| Greenleaf Solar Energy | Jarrettsville | Residential, | Solar Electric (pv), |
| Greenspring Energy | Timonium | Residential, ,Commercial, | Solar Electric (pv), |
| H2*Sunlight-61 | Columbia | Residential, | |
| H2sunlight | Columbia | Residential, | Solar Electric (pv), |
| Independent Power | Greene | Residential, | Solar Electric (pv), |
| Infinergy Wind & Solar Inc-Germantown | Germantown | Residential, | Solar Electric (pv), |
| Kenergy Solar | Millersville | Residential, ,Commercial, ,Utilities, ,Municipal, | Solar Electric (pv), |
| LBA Renewable Energy Systems | Beallsville | Residential, | Solar Electric (pv), |
| LBA Renewable Energy Systems Inc. | Beallsville | Residential, | Solar Electric (pv), |
| Leo Sunergy | Derwood | Residential, ,Commercial, | Solar Electric (pv), |
| LeoSunergy | Derwood | Residential, | Solar Electric (pv), |
| Mackey Electrical Services | Glenelg | Residential, ,Commercial, ,Utilities, | Solar Electric (pv), Solar Hot Water (thermal), |
| Mackey Electrical Services | Glenelg | Residential, Commercial, Municipal, | Solar Electric (pv), |
| Mackey Electriceal Services, Inc | Glenelg | Residential, | Solar Electric (pv), |
| Maryland Alternative Energy | Mt. Airy | Residential, | Solar Electric (pv), |
| Maryland Solar Solutions | Owings Mills | Residential, ,Commercial, | Solar Electric (pv), Solar Hot Water (thermal), |
| Moosehead Solar | Monson | Residential, | Solar Electric (pv), |
| New Wave Solar Energy | Randallstown | Residential, | Solar Electric (pv), |
| Patriot Mortgage Corporation | Laurel | Residential, | Solar Electric (pv), |
| Penobscot Solar Design | Penobscot | Residential, | Solar Electric (pv), |
| Pfister Energy | Baltimore | Residential, | Solar Electric (pv), |
| PhotoVoltUS | Skowhegan | Residential, | Solar Electric (pv), |
| Pioneer Green Energy-Princess Anne | Princess Anne | Residential, | Solar Electric (pv), |
| Powerup Solar | Chase | Residential, | Solar Electric (pv), |
| Renewable Energy Corporation HOT | Lutherville-Timonium | Residential, ,Commercial, | Solar Electric (pv), Solar Hot Water (thermal), |
| RJ Construction | Germantown | Residential, | Solar Electric (pv), |
| Simply Solar of Maryland | Abingdon | Residential, | Solar Electric (pv), |
| SJ Johnson Inc | Owings | Residential, | Solar Electric (pv), |
| Solar Energy Services | Millersville | Residential, ,Commercial, | Solar Electric (pv), Solar Hot Water (thermal), |
| Solar Energy Services ,Inc. | Millersville | Residential, | Solar Electric (pv), |
| Solar Energy World | Clarksville | Residential, Commercial, | Solar Electric (pv), |
| Solar Energy World FEATURED | Elkridge | Residential, ,Commercial, | Solar Electric (pv), |
| Solar Gaines | Cockeysville | Residential, ,Commercial, ,Municipal, | Solar Electric (pv), |
| Solar Market | Arundel | Residential, | Solar Electric (pv), |
| Solar Tech | Hollywood | Residential, ,Commercial, | Solar Electric (pv), |
| Solar Tech Inc. | Hollywood | Residential, | Solar Electric (pv), |
| Solar Universe – Annapolis | Annapolis | Residential, ,Commercial, | Solar Electric (pv), |
| Solar Universe- Annapolis- LT to Terence | Annapolis | Residential, Commercial, | Solar Electric (pv), |
| SolarCity – Silver Spring | Silver Spring | Residential, ,Commercial, | Solar Electric (pv), |
| SolarWinds NorthernLights | Waldorboro | Residential, | Solar Electric (pv), |
| SOLgenics | Columbia | Residential, | Solar Electric (pv), |
| Standard Solar | Rockville | Residential, ,Commercial, ,Utilities, ,Municipal, | Solar Electric (pv), |
| Stroika Construction Solutions | Ocean City | Residential, | Solar Electric (pv), |
| Sunedison | Baltimore | Residential, | Solar Electric (pv), |
| Sunlight-to-the Rescue | Burtonsville | Residential, | Solar Electric (pv), |
| Sunnyside Solar Energy | Parkton | Residential, | Solar Electric (pv), |
| Sustainable Energy Syst | Fredrick | Residential, | Solar Electric (pv), |
| Sustainable Energy Systems | Fredrick | Residential, | Solar Electric (pv), |
| Switch Renewable Energy | Gaithersburg | Commercial, | Solar Electric (pv), |
| T&B Electric Co. | Crofton | Residential, | Solar Electric (pv), |
| Vanguard Energy Partners – Baltimore | Baltimore | Residential, | Solar Electric (pv), |
| Veridian Energy Resources | Berlin | Residential, | Solar Electric (pv), |
