Bottle Rock Power
Bottle Rock Power is a 55 MW geothermal power plant in Lake County, California, operated by Mayacma Geothermal. EIA-860M lists 1 generating unit here, inside CAISO. Its unit entered service in 1985.
As of 2026-07 (inventory dated 2026-07-31) · EIA-860M Preliminary Monthly Electric Generator Inventory · eia.gov/…/july_generator2026.xlsx · eia.gov/…/eia860m
- Nameplate capacity
- 55 MW
- 9 MW net summer
- Generating units
- 1
- In service
- 1985
- EIA plant ID
- 902
Where it is
Loading map…
- County
- Lake County, California
- Coordinates
- 38.8348, -122.7677
- Balancing authority
- CISO
- Sector
- IPP Non-CHP
Units, technology and status
- Operator of record
- Mayacma Geothermal
- Primary energy source
- Geothermal
- Technologies
- Geothermal
- Status
- Out of service and NOT expected to return to service in next calendar year
Bottle Rock Power: FAQ
- Where is Bottle Rock Power?
- In Lake County, California (CA). The map on this page is placed at the coordinates EIA files for the plant, which locate the site rather than any individual unit.
- How big is Bottle Rock Power?
- 55 MW of nameplate capacity across 1 unit, as of the EIA-860M release for 2026-07.
- Who owns Bottle Rock Power?
- EIA-860M names Mayacma Geothermal as the reporting entity. That is the operator of record on the survey, which is not always the ultimate owner.
- Is this the same as Bottle Rock Power LLC?
- Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — Mayacma Geothermal here — not the project company that holds the asset. Project companies are commonly registered as an LLC carrying the plant's name, so a search for "Bottle Rock Power LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.
- Is Bottle Rock Power still running?
- EIA-860M files it as "Out of service and NOT expected to return to service in next calendar year" for 2026-07. Statuses change monthly, and this page follows the monthly release.