Hays Energy Project
VistraHays CountyERCOT
Hays Energy Facility is a four-block natural-gas combined-cycle station near San Marcos in Hays County, Texas. EIA's May 2026 inventory reports 989 MW of nameplate capacity, 931 MW of net summer capability, and 1,048 MW of net winter capability. ERCOT's September 2026 resource outlook separately lists the four HAYSEN resources at 988 MW installed and 844 MW of summer capability. Hays Energy, LLC is the registered owner and operator; Vistra identifies Hays in its Texas generation fleet.