| Rank | Company | Overall Rank | City | State | Employees | Primary Market | Primary Service | Total Megawatts Installed | Total Megawatts 2016 |
|---|---|---|---|---|---|---|---|---|---|
| 1 | RER Energy Group | 125 | Reading | PA | 15 | Commercial | Developer | 37.00 | 6.65 |
| 2 | Pennoni Associates | 135 | Philadelphia | PA | 1,250 | Commercial | EPC | 25.00 | 6.00 |
| 3 | Paradise Energy Solutions | 144 | Paradise | PA | 65 | Commercial | EPC | 90,528.33 | 5.26 |
| 4 | SolareAmerica | 182 | Upper Darby | PA | 8 | Commercial | EPC | 34,558.00 | 3.54 |
| 5 | EIS Solar | 350 | Pittsburgh | PA | 13 | Residential | Rooftop Contractor | 27,074.28 | 0.77 |
| 6 | KC Green Energy | 354 | Lancaster | PA | 12 | Commercial | EPC | 6.00 | 0.76 |
| 7 | Moore Energy | 361 | Southampton | PA | 20 | Commercial | EPC | 35,261.00 | 0.74 |
| 8 | Exact Solar | 396 | Newtown | PA | 5 | Residential | Rooftop Contractor | 11,880.49 | 0.50 |
| 9 | Solar States | 401 | Philadelphia | PA | 18 | Residential | EPC | 14,690.00 | 0.48 |
| 10 | Belmont Solar | 464 | Lancaster | PA | 4 | Residential | Rooftop Contractor | 16,250.17 | 0.20 |