Geothermal 1

Power plant · Geothermal

Key facts

Power plant · Geothermal Operating

Commissioned: 1983
Net generation, 2025: 338,449 MWh
Grid: 230 kV to Pacific Gas & Electric Co (CISO)
Location: Sonoma County, California
Operated by: Northern California Power AgnySourceEIA-860M Preliminary Monthly Electric Generator Inventory

Net generation MWh by year, 2002 to 2026

No companies named in filings yet.

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All 5 attributes from EIA-860M Preliminary Monthly Electric Generator Inventory

Attributes
Attribute	Value
Grid	Nerc region WECC Report year 2025 Grid voltage kv 230 Transmission owner Pacific Gas & Electric Co Balancing authority code CISO Balancing authority name California Independent System Operator
Fuel burned (MMBtu), 2025	1,154,787
Capacity factor, 2025	0.351
Net generation (MWh), 2025	338,449
Balancing authority code	CISO

3 sources

Sources

EIA-860MOpen license · retrieved Nov 4, 2026
EIAOpen license · retrieved Nov 1, 2026Source: U.S. Energy Information Administration, Electricity bulk data (Form EIA-923 monthly plant series)
EIA-860M Preliminary Monthly Electric Generator Inventory

Projects within 15 mi, nearest first.
Project	Kind	Away	MW
Western GeoPower Unit 1 Withdrawn	Geothermal	7.1 mi	25
Buckeye Geothermal Power Plant Postponed	Geothermal	8.2 mi	56.9
Wild Horse Power Plant Postponed	Geothermal	8.6 mi	48

Sources