Located about 30 miles northeast of San Antonio, the Guadalupe Energy Center is a 1,009 MW, combined-cycle plant purchased by Calpine in February 2014.  Electricity generated by the plant is sold into the ERCOT power market.

The Guadalupe plant includes two generation blocks, each consisting of two GE 7FA combustion turbines, two heat recovery steam generators and one GE steam turbine. Highly efficient combined-cycle facilities, such as the Guadalupe Energy Center, consume 40 percent less fuel per megawatt-hour than older plants, making them cost-effective, low-carbon sources of electricity.