| Business | Phone |
| Vantage Resource 792 Kimberly Ct E, Gaithersburg 20878 | (301) 990-1144 |
| Sustainable Design Group 22923 Wildcat Rd, Gaithersburg 20882 | (301) 428-1040 |
| Systems 4 Inc 18942 Bonanza Way, Gaithersburg 20879 | (301) 258-5000 |
| Thomas De Rosa Energy Gaithersburg 20877 | (301) 258-5112 |
| Mesco Metropolitan Energy Svrs 9104 Turtle Dove Ln, Gaithersburg 20879 | (301) 921-0708 |