Glenarm
Glenarm Power Plant is a municipally owned natural-gas station on Pasadena's historic Glenarm/State Street site, in operation in some form since July 4, 1907. Today it comprises six operating units — simple-cycle turbines GT-1 and GT-2 (1976), GT-3 and GT-4 (2004), and the combined-cycle GT-5/ST-1 pair added in a 2016 repowering — for a combined nameplate of about 265.6 MW. It is owned and run by the City of Pasadena's municipal utility, Pasadena Water and Power (PWP), which uses the plant mainly as flexible, quick-start local capacity to back up imports and integrate renewables rather than as baseload. The signature recent project was the roughly $137 million Glenarm Repowering Project, which retired the 1965-vintage steam unit B-3 and brought the 71 MW GE LM6000 combined-cycle GT-5 unit into commercial service on December 18, 2016. PWP has since proposed adding a 25 MW battery energy storage system on an adjacent parcel of the same site. No whole-plant or unit-level retirement is currently scheduled for any of the six operating generators, and the plant settles into CAISO at price nodes tied to the Glenarm and Broadway substations.