| Business | Phone |
| Cortex Energy 814 Elizabeth Rd, San Antonio 78209 | (210) 824-4298 |
| Keahey Exploration 900 Ne Loop 410 D124, San Antonio 78209 | (210) 826-0675 |
| Metano Energy Lp 7330 San Pedro Ave, San Antonio 78216 | (210) 798-1412 |
| Native Energy & Technology Inc 110 Broadway St, San Antonio 78205 | (210) 231-6060 |
| South Texas Controls Inc 10626 Gulfdale St 3, San Antonio 78216 | (210) 541-6792 |
| Southwest Texas Energy Corp 7110 W Beverly Mae Dr, San Antonio 78229 | (210) 614-1384 |
| Energy Developments 7000 Ih 10 E, San Antonio 78219 | (210) 666-0882 |
| Valero Energy 600 N Loop 1604 W, San Antonio 78201 | (210) 444-8500 |