How big is Geysers Unit 5-20?

Geysers Unit 5-20 reports 1,236 MW geothermal of operating nameplate capacity. These technology ratings do not establish a common export limit. Source: EIA Aug 2026.

What kind of plant is Geysers Unit 5-20?

Geysers Unit 5-20 is a geothermal facility in Sonoma County, CA, participating in the CAISO market.

Where is Geysers Unit 5-20 located?

Geysers Unit 5-20 is in Sonoma County, CA, inside the CAISO balancing area.

Who operates Geysers Unit 5-20?

Geysers Unit 5-20 is operated by Geysers Power Co LLC according to the EIA generator inventory. Reporting membership does not by itself establish ultimate ownership.

How much electricity does Geysers Unit 5-20 generate?

Geysers Unit 5-20 reported 4,196.7 GWh over the twelve months to 2026-07. Figures are net generation as filed to EIA-923.

How does Geysers Unit 5-20 compare to other plants?

By capacity, Geysers Unit 5-20 ranks #1 of 63 operating plants of the same technology nationally. It ranks #1 of 30 in CA.

Geysers Unit 5-20 — 1,236 MW power plant, Sonoma County, CA

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Geysers Unit 5-20 — 1,236 MW power plant, Sonoma County, CA · Ask the Grid

Generation and physical site

EIA plant 286 · Inventory for Aug 2026.

Reported operating nameplate by technology

geothermal: 1,236 MW

Operating generators only. Battery power is in MW; stored energy is in MWh. These ratings do not establish a shared export limit.

Generator records (14)

EIA generator status and nameplate capacity for Geysers Unit 5-20
Generator	Technology	Status	Power (MW)	Energy (MWh)
U11	Geothermal	Operating	118.8	Unknown
U12	Geothermal	Operating	118.8	Unknown
U13	Geothermal	Operating	139.8	Unknown
U14	Geothermal	Operating	124.2	Unknown
U16	Geothermal	Operating	124.2	Unknown
U17	Geothermal	Operating	124.2	Unknown
U18	Geothermal	Operating	124.2	Unknown
U20	Geothermal	Operating	124.2	Unknown
U5	Geothermal	Operating	59.4	Unknown
U6	Geothermal	Operating	59.4	Unknown
U7	Geothermal	Operating	59.4	Unknown
U8	Geothermal	Operating	59.4	Unknown
U10	Geothermal	Retired	55	Unknown
U9	Geothermal	Retired	55	Unknown

Physical map location · OpenStreetMap: 38.77911, -122.75440
Filed location · EIA: 38.77700, -122.74500

Registered plants sharing this mapped site

Shared physical site membership. Each plant keeps its own identity; this does not establish an electrical connection or settlement node.

Sources and observation dates

Inventory source: EIA-860M workbook (preliminary)
EIA reporting month: Aug 2026
EIA retrieved: Oct 10, 2026
OSM extract: Oct 9, 2026
OSM last mapped edit: Feb 7, 2026
Map prepared: Oct 10, 2026
Field verification: Not reported

Reporting month describes the inventory. Retrieval and map preparation describe processing; an OSM edit does not establish an in-service date.

EIA source inventory

Units and generators

Operating generator records and technology attributes reported through EIA-860.

Generator	Capacity	Technology	Operation	Status
U11	118.8 MW 68 MW summer	Geothermal Geothermal · ST	Dec 1975	Operating
U12	118.8 MW 51 MW summer	Geothermal Geothermal · ST	Aug 1979	Operating
U13	139.8 MW 65 MW summer	Geothermal Geothermal · ST	Apr 1980	Operating
U14	124.2 MW 60 MW summer	Geothermal Geothermal · ST	Feb 1980	Operating
U16	124.2 MW 60 MW summer	Geothermal Geothermal · ST	Oct 1985	Operating
U17	124.2 MW 60 MW summer	Geothermal Geothermal · ST	Nov 1982	Operating
U18	124.2 MW 60 MW summer	Geothermal Geothermal · ST	Nov 1983	Operating
U20	124.2 MW 50 MW summer	Geothermal Geothermal · ST	Oct 1985	Operating
U5	59.4 MW 45 MW summer	Geothermal Geothermal · ST	Apr 1971	Operating
U6	59.4 MW 45 MW summer	Geothermal Geothermal · ST	Apr 1971	Operating
U7	59.4 MW 40 MW summer	Geothermal Geothermal · ST	Jul 1972	Operating
U8	59.4 MW 40 MW summer	Geothermal Geothermal · ST	Jul 1972	Operating

Related parties and identifiers

Parties, market resources, and identifiers tied to this asset, with owner, operator, developer, EPC, compliance provider, and interconnecting entity roles kept separate.

Parties and identifiers

OrganizationRoleBasis

Calpine LLCOperatoroperating parent company

Constellation Energy CorporationInvestorultimate parent company

Reporting portfolio

EIA reporting entity

Geysers Power Co LLC

Entity 7160

Operating portfolio

4 plants

1 states

Reported capacity

1,515.4 MW

Geothermal

Largest reported plants in this portfolio
Largest reported plants	Capacity	State
Geysers Unit 5-20Current	1,236 MW	CA
Calistoga Power Plant	176.4 MW	CA
Sonoma California Geothermal	78 MW	CA
Aidlin Geothermal Power Plant	25 MW	CA

Portfolio membership follows the latest EIA-860 reporting entity. It does not imply ultimate ownership.

View full reporting portfolio

Overview

Infrastructure record

Overview

Infrastructure record

Explore related directories

Explore related directories

Structured profile

Generation and physical site

Reported operating nameplate by technology

Registered plants sharing this mapped site

Related assets

Calistoga Power Plant

Geothermal 1

Sonoma California Geothermal

Geothermal 2

Aidlin Geothermal Power Plant

Phillips 66 Rodeo Refinery

Units and generators

Performance

Peer context

Monthly generation

Grid and market context

Market registration

Nearby substations

Commercial, land, and environmental record

Related parties and identifiers

Parties and identifiers

Reporting portfolio

Timeline and sources

Project timeline

Sources

Common questions about Geysers Unit 5-20