| Business | Phone |
| Dte Energy Trading 2475 Northwinds Pkwy 200, Alpharetta 30004 | (770) 753-6466 |
| G E Power 1001 Windward Concourse, Alpharetta 30005 | (770) 619-0230 |
| Vericor Power Systems Inc 3625 Brookside Pkwy 500, Alpharetta 30022 | (770) 569-8800 |
| Voith Siemens Hydro Power 1345 Ridgeland Pkwy 116, Alpharetta 30004 | (678) 256-1500 |
| Oglethorpe Power Corp 3150 Webb Rd, Alpharetta 30004 | (678) 366-1821 |