Explore the largest geothermal power plants in CAISO and see all the utility-scale geothermal projects in CAISO on a map.
Last updated: May 2026
On this page, you can explore our real-time database of geothermal power plants in CAISO. Each month, we track geothermal projects and update our list of the largest geothermal power plants in CAISO.
As of May 2026, there are 15 utility-scale geothermal power plants in CAISO, according to Cleanview's project tracker. Their total operating capacity is 2,218 MW.
Total Geothermal Power Plants
15
Total Capacity
2,218 MW
Built in 2025
0
Map of geothermal power plants in CAISO. Marker size reflects capacity — only facilities with reported capacity data are shown.
1,236 MW
Year Operational: October 1985
Location: Sonoma, California
176 MW
Year Operational: March 1984
Location: Lake, California
110 MW
Year Operational: January 1983
Location: Sonoma, California
110 MW
Year Operational: May 1986
Location: Sonoma, California
92 MW
Year Operational: November 1988
Location: Inyo, California
90 MW
Year Operational: December 1989
Location: Inyo, California
90 MW
Year Operational: August 1989
Location: Inyo, California
78 MW
Year Operational: December 1983
Location: Lake, California
71 MW
Year Operational: April 2012
Location: Churchill, Nevada
44 MW
Year Operational: July 2022
Location: Mono, California
71 MW
Year Operational: April 2012
Location: Churchill, Nevada
15 MW
Year Operational: December 1990
Location: Mono, California
15 MW
Year Operational: December 1990
Location: Mono, California
90 MW
Year Operational: December 1989
Location: Inyo, California
90 MW
Year Operational: August 1989
Location: Inyo, California
25 MW
Year Operational: May 1989
Location: Sonoma, California
92 MW
Year Operational: November 1988
Location: Inyo, California
110 MW
Year Operational: May 1986
Location: Sonoma, California
Cleanview