| Business | Phone |
| Dynegy Parts & Technical Svc 11555 Clay Rd, Houston 77043 | (713) 939-8100 |
| Ferrellgas 99 Holmes Rd, Houston 77045 | (713) 667-1122 |
| Gas Equipment Co Inc 11510 N Petropark Dr, Houston 77041 | (713) 896-1077 |
| Gas Turbine Efficiency 12 E Greenway Plz, Houston 77046 | (713) 425-4950 |