Data last collected:
PowerPlantFactsEvidence report · prepared 19 October 2026https://powerplantfacts.com/entity/510
EIA plant 510
Middletown · Lake · CA
Sonoma California Geothermal
Operated by Geysers Power Co LLC
Published location
Where is Sonoma California Geothermal?
This locator uses the coordinates in the approved source record. It shows geographic context, not a site boundary, safety zone or property-risk area.
38.790300, -122.755900
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Capacity is not generation. Nameplate MW describes equipment; annual MWh describes recorded output. Proposed and retired units are not added to operating capacity.
Equipment mix
Operating capacity by technology
Grouped from this plant’s represented generator records. Use the CA plant index for regional peers.
See the evidence
Electricity output across the year
Monthly net generation shows the seasonal shape of this plant's represented output. A negative value is retained when the source reports net consumption.
137,943
235,786
338,591
436,812
539,726
636,145
737,541
838,157
936,988
1037,000
1136,857
1236,085
MWh net generation · 2024 final edition · EIA 923 represented operating rows. 12 of 12 supplied rows shown; 0 missing values omitted. Months with no reported numeric value are omitted, not treated as zero.
Read the chart as a table
| Record | MWh net generation |
|---|---|
| 1 | 37,943 |
| 2 | 35,786 |
| 3 | 38,591 |
| 4 | 36,812 |
| 5 | 39,726 |
| 6 | 36,145 |
| 7 | 37,541 |
| 8 | 38,157 |
| 9 | 36,988 |
| 10 | 37,000 |
| 11 | 36,857 |
| 12 | 36,085 |
2024 monthly net generation
| Month | Net generation |
|---|---|
| 1 | 37,943 MWh |
| 2 | 35,786 MWh |
| 3 | 38,591 MWh |
| 4 | 36,812 MWh |
| 5 | 39,726 MWh |
| 6 | 36,145 MWh |
| 7 | 37,541 MWh |
| 8 | 38,157 MWh |
| 9 | 36,988 MWh |
| 10 | 37,000 MWh |
| 11 | 36,857 MWh |
| 12 | 36,085 MWh |
Operating generators
| ID | Technology | Fuel | MW | Status |
|---|---|---|---|---|
| 1 | Geothermal | GEO | 78 | OP |
Continue exploring
Similar-capacity plants in the same state
Identity, technology and limitations
EIA plant ID
510
Sector
IPP Non-CHP
Water source
Wells
Data edition
2024-final
Use this record
Questions this evidence can answer
01What exactly is this record?
Use the name, place, date and identifiers above to confirm that you have the right Sonoma California Geothermal power plant: capacity and generation | PowerPlantFacts record.
02What does the evidence establish?
Read the reported values with their units, coverage dates and source notes. Keep observed facts separate from estimates or interpretation.
03What should I verify next?
Follow the primary-source links and check the limitations before using this evidence for a decision, comparison or citation.
A closer look at Sonoma California Geothermal
Variation in the published months
Across 12 numeric monthly generation entries, 5 has the highest recorded value (39,726 MWh) and 2 the lowest (35,786 MWh). Their difference is 3,940 MWh. Missing months have not been treated as zero.
Generator capacity in different operating conditions
| Generator ID | Technology | Nameplate MW | Summer MW | Winter MW | Minimum load MW |
|---|---|---|---|---|---|
| 1 | Geothermal | 78.0 | 50.0 | 55.0 | 10.0 |
EIA-860 2024 final source. Ratings describe capacity, not actual generation or availability. Missing ratings are not zero.
Source: US Energy Information Administration Form EIA-860 2024 plant and operable-generator workbooks; archive 2024. US EIA-authored information is generally public domain; cite EIA, preserve third-party exceptions, changes and no-endorsement context. Source-specific derived data.