Big Fork
Flathead County, Montana · EIA plant ID 6459 · Operator: PacifiCorp
Nameplate4MWSummer 5 MW
Generators3in service
Net generation25GWh12 mo to Dec 2025
Capacity factor61%hydro units, summer MW
Heat rate—thermal plants only
First online1910
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 | 17.7 | 49.4% | — |
| 2002 | 19.5 | 54.4% | — |
| 2003 | 26.6 | 73.9% | — |
| 2004 | 30.1 | 83.5% | — |
| 2005 | 30.9 | 85.9% | — |
| 2006 | 31.4 | 87.4% | — |
| 2007 | 24.4 | 60.6% | — |
| 2008 | 27.6 | 68.2% | — |
| 2009 | 29 | 71.9% | — |
| 2010 | 32.3 | 80.1% | — |
| 2011 | 34.7 | 86.0% | — |
| 2012 | 33.4 | 82.7% | — |
| 2013 | 30.2 | 74.9% | — |
| 2014 | 31.2 | 77.5% | — |
| 2015 | 26.5 | 65.8% | — |
| 2016 | 29.5 | 73.0% | — |
| 2017 | 21.4 | 53.2% | — |
| 2018 | 26.1 | 64.8% | — |
| 2019 | 27.2 | 67.5% | — |
| 2020 | 27 | 66.9% | — |
| 2021 | 28.4 | 70.5% | — |
| 2022 | 26.3 | 65.4% | — |
| 2023 | 25.1 | 62.3% | — |
| 2024 | 21.3 | 52.8% | — |
| 2025 | 24.6 | 61.0% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| 1 | Conventional Hydroelectric | HY | 1.7 | 1.9 | Jul 1927 | Operating | — | coming soon |
| 2 | Conventional Hydroelectric | HY | 1.7 | 1.9 | Jul 1928 | Operating | — | coming soon |
| 3 | Conventional Hydroelectric | HY | 0.7 | 0.8 | Jul 1910 | Operating | — | coming soon |
Owner / operator
Operator: PacifiCorp. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| PacifiCorp | 100.0% | 4 MW |
Nearby plants
Within 80 km.
| Hungry Horse | 428 MW | 31.7 km |
| Flathead Landfill to Gas Energy Facility | 3 MW | 34.7 km |
| Stoltze CoGen1 | 3 MW | 38.6 km |
| Kerr | 228 MW | 44.1 km |