The Los Esteros Critical Energy Facility is a power plant in San Jose, California, operated by Calpine. Located near the San Jose-Milpitas border, it began operations in 2003 with an initial capacity of 188 megawatts.^[1] In 2013 it was upgraded to 309 megawatts.^[2] The facility uses four natural gas turbines run as a combined-cycle facility where the exhaust from the gas turbine is used to create steam that drives a steam generator.^[1]