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Limits RegistryThe Geysers has been in commercial operation since 1960, making it also one of the longest continuously operating geothermal developments anywhere. Actual net output (around 900 MW as of recent years) runs below nameplate capacity because of natural, gradual steam-pressure decline in the underlying reservoir, which operators partially offset by injecting treated wastewater into the field to help sustain steam production.
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The Geysers has been in commercial operation since 1960, making it also one of the longest continuously operating geothermal developments anywhere. Actual net output (around 900 MW as of recent years) runs below nameplate capacity because of natural, gradual steam-pressure decline in the underlying reservoir, which operators partially offset by injecting treated wastewater into the field to help sustain steam production.
The Geysers geothermal field in the Mayacamas Mountains of Northern California hosts 18 currently operating geothermal power plants with a combined nameplate capacity of approximately 1,517 MW, the largest concentration of geothermal generating capacity in the world, per Guinness World Records.
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Limits Registry. LR-THE-GEYSERS-GEOTHERMAL. The Geysers — largest geothermal power complex in the world. 2026.