Calpine began commercial operations at its Russell City Energy Center and Los Esteros Critical Energy Facility, both located in the San Francisco Bay area. Together, the two plants bring on-line more than 900 MW of combined-cycle natural gas-fired power generation capacity. The full power output of both plants will be delivered to Calpine’s customer, Pacific Gas and Electric Company (PG&E), which will also supply the natural gas fuel, under 10-year power purchase agreements.