Island Park
Fremont County, Idaho · EIA plant ID 4204 · Operator: Fall River Rural Elec Coop Inc
Nameplate5MWSummer 5 MW
Generators2in service
Net generation10GWh12 mo to Dec 2025
Capacity factor23%hydro units, summer MW
Heat rate—thermal plants only
First online1994
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 | 14.8 | 35.2% | — |
| 2002 | 10.5 | 24.9% | — |
| 2003 | 0.7 | 1.6% | — |
| 2004 | 0 | 0.0% | — |
| 2005 | 0 | 0.0% | — |
| 2006 | 0 | 0.1% | — |
| 2007 | 0 | 0.0% | — |
| 2008 | 17.3 | 41.1% | — |
| 2009 | 20.2 | 48.0% | — |
| 2010 | 18.1 | 42.9% | — |
| 2011 | 21 | 49.9% | — |
| 2012 | 23.4 | 55.5% | — |
| 2013 | 18.3 | 43.4% | — |
| 2014 | 15.7 | 37.3% | — |
| 2015 | 14.2 | 33.9% | — |
| 2016 | 4.8 | 11.5% | — |
| 2017 | 18.4 | 43.8% | — |
| 2018 | 17.4 | 41.3% | — |
| 2019 | 13.5 | 32.1% | — |
| 2020 | 18.9 | 44.7% | — |
| 2021 | 12.4 | 29.4% | — |
| 2022 | 13.2 | 31.5% | — |
| 2023 | 16.3 | 38.7% | — |
| 2024 | 17.9 | 42.4% | — |
| 2025 | 9.7 | 23.0% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| HY1 | Conventional Hydroelectric | HY | 2.4 | 2.4 | Apr 1994 | Operating | — | coming soon |
| HY2 | Conventional Hydroelectric | HY | 2.4 | 2.4 | Apr 1994 | Operating | — | coming soon |
Owner / operator
Operator: Fall River Rural Elec Coop Inc. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Fall River Rural Elec Coop Inc | 100.0% | 5 MW |
Nearby plants
Within 80 km.
| Ashton | 7 MW | 38.6 km |
| Falls River Hydro | 9 MW | 40 km |
| Old Faithful | 2 MW | 44.7 km |
| Chester Diversion Hydroelectric Project | 4 MW | 46.9 km |
| Felt | 7 MW | 56.8 km |
| Lake (WY) | 3 MW | 65.3 km |