Oak GroveOut of service
Clackamas County, Oregon · EIA plant ID 6505 · Operator: Portland General Electric Co
Nameplate51MWSummer 44 MW
Generators2in service
Net generation142GWh12 mo to Dec 2025
Capacity factor37%hydro units, summer MW
Heat rate—thermal plants only
First online1924
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 | 193.6 | 50.2% | — |
| 2002 | 223.3 | 57.9% | — |
| 2003 | 223.6 | 58.0% | — |
| 2004 | 186.6 | 48.3% | — |
| 2005 | 182.7 | 47.4% | — |
| 2006 | 263 | 68.2% | — |
| 2007 | 244.5 | 63.4% | — |
| 2008 | 246.5 | 63.8% | — |
| 2009 | 252.5 | 65.5% | — |
| 2010 | 241.9 | 62.8% | — |
| 2011 | 261.7 | 67.9% | — |
| 2012 | 275.3 | 71.2% | — |
| 2013 | 196.8 | 51.1% | — |
| 2014 | 209.1 | 54.3% | — |
| 2015 | 159 | 41.3% | — |
| 2016 | 187.4 | 48.5% | — |
| 2017 | 209.2 | 54.3% | — |
| 2018 | 184.8 | 47.9% | — |
| 2019 | 160.6 | 41.7% | — |
| 2020 | 107.3 | 27.8% | — |
| 2021 | -0.7 | -0.2% | — |
| 2022 | 46.3 | 12.0% | — |
| 2023 | 152.1 | 39.5% | — |
| 2024 | 150.1 | 38.9% | — |
| 2025 | 142.1 | 36.9% | — |
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 | 25.5 | 22 | Aug 1924 | Operating (Out of service) | — | coming soon |
| 2 | Conventional Hydroelectric | HY | 25.5 | 22 | Mar 1931 | Operating (Out of service) | — | coming soon |
Owner / operator
Operator: Portland General Electric Co. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Portland General Electric Co | 100.0% | 51 MW |
Nearby plants
Within 80 km.
| Tualatin Battery Energy Storage System | — | 14.6 km |
| Stone Creek | 12 MW | 15.1 km |
| North Fork | 41 MW | 21.3 km |
| Faraday | 37 MW | 25.5 km |
| Day Hill Solar, LLC | 2 MW | 26.1 km |
| OR - Solops - SPI 18 - Clayfield | 3 MW | 26.7 km |