Sierra Pacific Sonora
Tuolumne County, California · EIA plant ID 54517 · Operator: Sierra Pacific Industries Inc
Nameplate8MWSummer 6 MW
Generators1in service
Net generation43GWh12 mo to Dec 2025
Capacity factor81%other units, summer MW
Heat rate—thermal plants only
First online2018
Monthly net generation
EIA-923, all units at the plant. Net of station use; storage can go negative.
FinalPreliminary
Capacity factor by year
Net MWh ÷ (summer MW × hours), other units. Each year uses that year's EIA-860 ratings; the hollow dot is the latest 12 months.
Heat rate by year
Electric fuel MMBtu × 1000 ÷ net MWh (Btu/kWh, HHV), fossil units only; CT + CA counted as one combined-cycle block.
Heat rate applies to fuel-burning (thermal) units only.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2001 | 66.3 | 127.3% | — |
| 2002 | 46.2 | 81.2% | — |
| 2003 | 46.3 | 81.2% | — |
| 2004 | 39.3 | 68.8% | — |
| 2005 | 38 | 66.6% | — |
| 2006 | 35.9 | 75.3% | — |
| 2007 | 31.7 | 58.3% | — |
| 2008 | 40.6 | 74.6% | — |
| 2009 | 34.9 | 95.1% | — |
| 2011 | 7.8 | 14.2% | — |
| 2012 | 24.6 | 53.9% | — |
| 2013 | 25.1 | 47.0% | — |
| 2014 | 38.5 | 73.2% | — |
| 2015 | 31.6 | 60.1% | — |
| 2016 | 28.4 | 54.0% | — |
| 2017 | 29.6 | 56.4% | — |
| 2018 | 29.5 | 61.3% | — |
| 2019 | 33.7 | 64.1% | — |
| 2020 | 38.7 | 73.4% | — |
| 2021 | 37.6 | 71.6% | — |
| 2022 | 39.4 | 75.0% | — |
| 2023 | 34 | 64.6% | — |
| 2024 | 34.9 | 66.2% | — |
| 2025 | 42.7 | 81.2% | — |
Generators
EIA-860 (annual) with EIA-860M updates through Sep 2026. EIA-923 reports generation by plant, prime mover and fuel, not by unit, so unit-level output isn't shown.
| Gen ID | Technology | Prime mover | Nameplate MW | Summer MW | Online | Status | Planned retirement | OEM / model |
|---|---|---|---|---|---|---|---|---|
| GEN3 | Wood/Wood Waste Biomass | ST | 7.5 | 6 | Apr 2018 | Operating | — | coming soon |
| GEN2 | Wood/Wood Waste Biomass | ST | 7.5 | 6 | Feb 2001 | Retired Mar 2018 | — | coming soon |
Owner / operator
Operator: Sierra Pacific Industries Inc. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Sierra Pacific Industries Inc | 100.0% | 8 MW |
Nearby plants
Within 80 km.
| Phoenix | 2 MW | 7.3 km |
| Sierra Pacific Chinese Camp | 4 MW | 15.1 km |
| Moccasin Low Head Hydro Project | 3 MW | 16.7 km |
| Sierra Energy Storage, LLC | 10 MW | 17.3 km |
| Pacific-Ultrapower Chinese Station | 25 MW | 17.4 km |
| Moccasin | 104 MW | 17.5 km |