| Business | Phone |
| Alamo Transformer Supply Co 10220 Mykawa Rd, Houston 77048 | (713) 991-6060 |
| Alstom Usa Inc 11767 Katy Fwy 810, Houston 77079 | (281) 496-7666 |
| Areva T & D Inc 11767 Katy Fwy, Houston 77079 | (281) 496-9449 |
| Equisales Associates Inc 13811 Cullen Blvd, Houston 77047 | (713) 733-4122 |
| Heeco Transformers Inc 1111 Bonner St, Houston 77007 | (713) 861-3881 |