Isabella Hydro Project
Kern County, California · EIA plant ID 10139 · Operator: Isabella Partners
Nameplate12MWSummer 12 MW
Generators2in service
Net generation32GWh12 mo to Dec 2025
Capacity factor31%hydro units, summer MW
Heat rate—thermal plants only
First online1990
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 | 8.7 | 8.9% | — |
| 2002 | 4.7 | 4.5% | — |
| 2003 | 13.4 | 13.0% | — |
| 2004 | 11.9 | 11.5% | — |
| 2005 | 46.4 | 44.9% | — |
| 2006 | 18.2 | 17.6% | — |
| 2007 | 8.1 | 7.8% | — |
| 2008 | 16.7 | 16.1% | — |
| 2009 | 12.8 | 12.3% | — |
| 2010 | 40.5 | 39.2% | — |
| 2011 | 70.4 | 68.1% | — |
| 2012 | 7.3 | 7.1% | — |
| 2013 | 6.5 | 6.3% | — |
| 2014 | 6 | 5.8% | — |
| 2015 | 0 | 0.0% | — |
| 2016 | 7.5 | 7.2% | — |
| 2017 | 56.5 | 54.6% | — |
| 2018 | 18.7 | 18.1% | — |
| 2019 | 45.6 | 44.1% | — |
| 2020 | 17.5 | 16.9% | — |
| 2021 | 3.3 | 3.2% | — |
| 2022 | 2.3 | 2.2% | — |
| 2023 | 1.5 | 1.4% | — |
| 2024 | 43 | 41.5% | — |
| 2025 | 32.1 | 31.0% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| GEN1 | Conventional Hydroelectric | HY | 5.9 | 5.9 | Dec 1990 | Operating | — | coming soon |
| GEN2 | Conventional Hydroelectric | HY | 5.9 | 5.9 | Dec 1990 | Operating | — | coming soon |
Owner / operator
Operator: Isabella Partners. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Isabella Partners | 100.0% | 12 MW |
Nearby plants
Within 80 km.
| Kern River 3 | 40 MW | 20 km |
| Kern River 1 | 26 MW | 31.1 km |
| Kern Canyon | 12 MW | 33.5 km |
| Rio Bravo Hydro Project | 14 MW | 36.1 km |
| North Sky River Energy LLC | 162 MW | 38.8 km |
| Redcrest Solar Farm | 17 MW | 43 km |