Nimbus
Sacramento County, California · EIA plant ID 444 · Operator: U S Bureau of Reclamation
Nameplate13MWSummer 17 MW
Generators2in service
Net generation59GWh12 mo to Aug 2026
Capacity factor41%hydro units, summer MW
Heat rate—thermal plants only
First online1955
The 12-month figures include preliminary EIA-923 months, which EIA revises. Final data runs through Dec 2025.
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), hydro 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 | 41.6 | 28.6% | — |
| 2002 | 54.2 | 37.2% | — |
| 2003 | 67.8 | 46.7% | — |
| 2004 | 46.7 | 32.0% | — |
| 2005 | 72.3 | 49.7% | — |
| 2006 | 77.7 | 53.4% | — |
| 2007 | 41.3 | 28.4% | — |
| 2008 | 34.4 | 23.6% | — |
| 2009 | 58.8 | 40.4% | — |
| 2010 | 59.7 | 41.0% | — |
| 2011 | 81 | 55.7% | — |
| 2012 | 56.4 | 38.7% | — |
| 2013 | 45.7 | 31.4% | — |
| 2014 | 26.1 | 18.0% | — |
| 2015 | 27.7 | 19.0% | — |
| 2016 | 54 | 37.0% | — |
| 2017 | 64.7 | 44.5% | — |
| 2018 | 59.5 | 40.9% | — |
| 2019 | 40.3 | 27.7% | — |
| 2020 | 47.2 | 32.4% | — |
| 2021 | 22.3 | 15.4% | — |
| 2022 | 46.1 | 31.7% | — |
| 2023 | 69.9 | 48.0% | — |
| 2024 | 57.7 | 39.6% | — |
| 2025 | 35.5 | 24.4% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| 1 | Conventional Hydroelectric | HY | 6.7 | 8.3 | May 1955 | Operating | — | coming soon |
| 2 | Conventional Hydroelectric | HY | 6.7 | 8.3 | Jun 1955 | Operating | — | coming soon |
Owner / operator
Operator: U S Bureau of Reclamation. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| U S Bureau of Reclamation | 100.0% | 13 MW |
Nearby plants
Within 80 km.
| Intel Folsom | 1 MW | 4.2 km |
| Intel Folsom Phase 2 | 1 MW | 4.9 km |
| Intel Folsom Phase 3 | 5 MW | 5.1 km |
| Aerojet II | 2 MW | 5.4 km |
| Aerojet I | 3 MW | 5.6 km |
| Folsom SP and CSP Sacramento | 1 MW | 7.6 km |