Really? I just looked at
http://fortune.com/fortune500/ and there's only 5 listed as "Energy" in the top 500. NRG Energy Inc., UGI Corporation, The Williams Companies, Inc., Calpine Corporation, and Energy Future Holdings Corp.
Of those, Calpine Corp. is headquartered in Houston and Energy Future Holdings Corp. is located in Dallas. I say in Texas because that's where P1nky says he's from.
NRG does solar power, they have many assets in Texas (predictably). UGI and Williams don't publish their project locations easily enough for me to find them in 30 seconds so I assume they probably also have stuff in Texas because, Energy.
So I guess I didn't narrow it down too much, but at least we now know he interviewed for one of those 5 companies.