South Forks Hydro
Twin Falls County, Idaho · EIA plant ID 10296 · Operator: South Forks Joint Venture
Nameplate8MWSummer 8 MW
Generators2in service
Net generation26GWh12 mo to Dec 2025
Capacity factor38%hydro units, summer MW
Heat rate—thermal plants only
First online1984
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 | 25 | 35.6% | — |
| 2002 | 25.2 | 35.9% | — |
| 2003 | 25.8 | 36.8% | — |
| 2004 | 24.7 | 35.2% | — |
| 2005 | 23 | 32.8% | — |
| 2006 | 25.1 | 35.9% | — |
| 2007 | 25.9 | 37.0% | — |
| 2008 | 28.1 | 40.0% | — |
| 2009 | 26.9 | 38.4% | — |
| 2010 | 27.6 | 39.4% | — |
| 2011 | 28.2 | 40.3% | — |
| 2012 | 28.1 | 40.0% | — |
| 2013 | 27.2 | 38.8% | — |
| 2014 | 29.3 | 41.8% | — |
| 2015 | 27.8 | 39.7% | — |
| 2016 | 26.8 | 38.1% | — |
| 2017 | 28.3 | 40.4% | — |
| 2018 | 29.6 | 42.3% | — |
| 2019 | 26.4 | 37.7% | — |
| 2020 | 29.6 | 42.1% | — |
| 2021 | 26.3 | 37.5% | — |
| 2022 | 22.4 | 32.0% | — |
| 2023 | 26.8 | 38.2% | — |
| 2024 | 26 | 37.0% | — |
| 2025 | 26.3 | 37.6% | — |
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 | 4 | 4 | Dec 1984 | Operating | — | coming soon |
| GEN2 | Conventional Hydroelectric | HY | 4 | 4 | Dec 1984 | Operating | — | coming soon |
Owner / operator
Operator: South Forks Joint Venture. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| South Forks Joint Venture | 100.0% | 8 MW |
Nearby plants
Within 80 km.
| Low Line Rapids | 3 MW | 6 km |
| Clif Bar Bakery of Twin Falls | 2 MW | 9.9 km |
| Cargill Dry Creek Biofactory | retired | 10.1 km |
| Amalgamated Sugar Twin Falls | 13 MW | 10.9 km |
| Twin Falls (ID) | 53 MW | 11.2 km |
| Shoshone Falls | 15 MW | 13.8 km |