| Business | Phone |
| Calpine Corp 717 Texas St 1000, Houston 77002 | (713) 570-3500 |
| Gulf Power Systems Inc 425 N Wayside Dr, Houston 77020 | (281) 458-4282 |
| Direct Energy Houston 77002 | (832) 473-2477 |
| Onyx Power 1200 Smith St 1600, Houston 77002 | (713) 751-0043 |
| Reliant Energy 2102 Austin St, Houston 77002 | (713) 571-0949 |
| Reliant Energy Inc 1000 Main St, Houston 77002 | (713) 497-3000 |
| St Charles Electric Co 4822 Merwin St 16, Houston 77027 | (713) 552-0645 |
| Startex Power 3200 Southwest Fwy 1000, Houston 77027 | (713) 357-2800 |
| Texas First Energy 3100 Timmons Ln, Houston 77027 | (713) 621-5491 |
| Affordable Power Plan Lp 6161 Savoy Dr, Houston 77036 | (713) 337-2900 |
| Texas Energy & Power 6666 Harwin Dr, Houston 77036 | (713) 782-8809 |
| Story Electric Co 8155 Mayhaw Ln, Houston 77044 | (281) 458-6431 |
| Saulsbury Electric Co 515 N Sam Houston Pkwy E, Houston 77060 | (281) 820-3686 |
| Utility Choice Electric 7660 Woodway Dr, Houston 77063 | (713) 465-6200 |
| Reliant Energy Inc 16303 Tomball Pkwy, Houston 77064 | (281) 517-9089 |
| Power Reading 5020 Fm 1960 Rd W, Houston 77069 | (281) 587-6937 |
| Strategic Energy 12012 Wickchester Ln 140, Houston 77079 | (281) 597-8300 |
| Texas Commercial Energy 4848 Pin Oak Park 208, Houston 77081 | (713) 787-9625 |
| Tip Electric Co 17430 W Little York Rd, Houston 77084 | (281) 802-9402 |
| Zion Electrical Contractor 7418 Moline St, Houston 77087 | (713) 649-2884 |
| Center Point Energy Houston 1111 Louisiana St, Houston 77002 | (713) 207-2222 |