I don't think Texas exports much electrical power. Most of Texas is inside ERCOT (Electric Reliability Council of Texas). To stay out of federal regulated commerce laws, ERCOT does not sell or buy power outside their area, except under emergencies.
RTO/ISO Regions - ERCOT
http://www.ferc.gov/industries/electric/indus-act/rto/ercot.asp#skipnavsub
Well Grayout Davis was blaming Texas energy companies for not giving California enough energy.