Tunnel 1 Power Project
Malheur County, Oregon · EIA plant ID 50362 · Operator: Owyhee Irrigation District
Nameplate9MWSummer 9 MW
Generators1in service
Net generation21GWh12 mo to Dec 2025
Capacity factor28%hydro units, summer MW
Heat rate—thermal plants only
First online1993
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 | 7.7 | 13.1% | — |
| 2002 | 7.8 | 21.6% | — |
| 2003 | 0 | 0.0% | — |
| 2004 | 7.5 | 12.8% | — |
| 2005 | 17.5 | 30.0% | — |
| 2006 | 33.7 | 57.9% | — |
| 2007 | 12.6 | 21.4% | — |
| 2008 | 11.1 | 18.8% | — |
| 2009 | 8.4 | 14.3% | — |
| 2010 | 6.5 | 11.0% | — |
| 2011 | 24.1 | 41.1% | — |
| 2012 | 15.5 | 26.3% | — |
| 2013 | 3 | 5.1% | — |
| 2014 | 0 | 0.0% | — |
| 2015 | 0 | 0.0% | — |
| 2016 | 10.6 | 17.9% | — |
| 2017 | 22.9 | 39.0% | — |
| 2018 | 16.4 | 27.9% | — |
| 2019 | 22.3 | 38.0% | — |
| 2020 | 18.9 | 32.1% | — |
| 2021 | 6.3 | 10.7% | — |
| 2022 | 3.5 | 6.0% | — |
| 2023 | 15.3 | 20.5% | — |
| 2024 | 22.4 | 30.0% | — |
| 2025 | 21.1 | 28.3% | — |
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 | 8.5 | 8.5 | Jun 1993 | Operating | — | coming soon |
Owner / operator
Operator: Owyhee Irrigation District. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Owyhee Irrigation District | 100.0% | 9 MW |
Nearby plants
Within 80 km.
| Owyhee Dam Power Project | 5 MW | 0.9 km |
| Michell Butte Power Project | 2 MW | 15.7 km |
| Open Range Solar Center, LLC | 10 MW | 21.8 km |
| Fargo Drop | 1 MW | 26.9 km |
| Grove Solar Center, LLC | 6 MW | 34.9 km |
| Vale Air Solar Center, LLC | 10 MW | 36 km |