| Business | Phone |
| Baltimore Gas & Electric Co 39 W Lexington St # 1100, Baltimore 21201 | (410) 234-5000 |
| Constellation Power Source Inc 111 Market Pl # 500, Baltimore 21202 | (410) 468-3500 |
| Farimount Electric Corp 28 S Highland Ave, Baltimore 21224 | (410) 276-2460 |
| Hirsch Electronics 3030 Saint Johns Ln, Baltimore 21214 | (410) 426-4221 |
| Aaa Quality Electric Baltimore 21286 | (410) 821-7884 |
| Powerpoint Electrical Inc 1136 Dundalk Ave, Baltimore 21224 | (410) 633-0005 |