Twin Falls Hydro
King County, Washington · EIA plant ID 50827 · Operator: Central Rivers Power US, LLC
Nameplate24MWSummer 23 MW
Generators2in service
Net generation59GWh12 mo to Dec 2025
Capacity factor30%hydro units, summer MW
Heat rate—thermal plants only
First online1989
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 | 65.5 | 32.8% | — |
| 2002 | 55.3 | 27.7% | — |
| 2003 | 67.9 | 34.0% | — |
| 2004 | 6.5 | 3.3% | — |
| 2005 | 48.4 | 24.3% | — |
| 2006 | 67.3 | 33.7% | — |
| 2007 | 72.9 | 36.5% | — |
| 2008 | 73.4 | 36.6% | — |
| 2009 | 68.4 | 34.3% | — |
| 2010 | 75.8 | 38.0% | — |
| 2011 | 90.3 | 45.2% | — |
| 2012 | 95.7 | 47.8% | — |
| 2013 | 83.6 | 41.9% | — |
| 2014 | 92.6 | 46.3% | — |
| 2015 | 52.6 | 26.4% | — |
| 2016 | 79.8 | 39.9% | — |
| 2017 | 77.8 | 38.9% | — |
| 2018 | 78.3 | 39.2% | — |
| 2019 | 53.2 | 26.6% | — |
| 2020 | 75.5 | 37.7% | — |
| 2021 | 78.6 | 39.4% | — |
| 2022 | 70.3 | 35.2% | — |
| 2023 | 50 | 25.0% | — |
| 2024 | 62.9 | 31.4% | — |
| 2025 | 59.3 | 29.7% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| UNI1 | Conventional Hydroelectric | HY | 12 | 11.4 | Dec 1989 | Operating | — | coming soon |
| UNI2 | Conventional Hydroelectric | HY | 12 | 11.4 | Dec 1989 | Operating | — | coming soon |
Owner / operator
Operator: Central Rivers Power US, LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Enel North America, Inc. | 49.5% | 12 MW |
| Central Rivers Power US, LLC | 49.5% | 12 MW |
| South Fork Resources Inc | 1.0% | 0 MW |
Nearby plants
Within 80 km.
| Weeks Falls | 4 MW | 3.2 km |
| Black Creek | 4 MW | 6.4 km |
| Cedar Falls (WA) | 30 MW | 7.6 km |
| Hancock Creek Hydroelectric Project | 6 MW | 14.2 km |
| Snoqualmie | 13 MW | 15.4 km |
| Snoqualmie 2 | 39 MW | 16 km |