Marengo Wind Plant
Columbia County, Washington · EIA plant ID 56466 · Operator: PacifiCorp
Nameplate234MWSummer 234 MW
Generators2in service
Net generation613GWh12 mo to Dec 2025
Capacity factor30%wind units, summer MW
Heat rate—thermal plants only
First online2007
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), wind 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) |
|---|---|---|---|
| 2007 | 160.6 | 31.2% | — |
| 2008 | 478.7 | 25.9% | — |
| 2009 | 474.8 | 25.7% | — |
| 2010 | 496.4 | 26.9% | — |
| 2011 | 597.8 | 32.4% | — |
| 2012 | 536.2 | 29.0% | — |
| 2013 | 485.9 | 26.3% | — |
| 2014 | 542.3 | 29.4% | — |
| 2015 | 436.7 | 23.7% | — |
| 2016 | 526.4 | 28.5% | — |
| 2017 | 468.9 | 25.4% | — |
| 2018 | 500.9 | 27.2% | — |
| 2019 | 234.7 | 12.7% | — |
| 2020 | 648.8 | 31.6% | — |
| 2021 | 732.3 | 35.7% | — |
| 2022 | 588.1 | 28.7% | — |
| 2023 | 560.6 | 27.4% | — |
| 2024 | 692.7 | 33.7% | — |
| 2025 | 612.6 | 29.9% | — |
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 | Onshore Wind Turbine | WT | 156 | 156 | Aug 2007 | Operating | — | vestas V100-2.0 |
| 2 | Onshore Wind Turbine | WT | 78 | 78 | Jan 2008 | Operating | — | vestas V100-2.0 |
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% | 234 MW |
Nearby plants
Within 80 km.
| Hopkins Ridge Wind | 157 MW | 6.7 km |
| Lower Snake Solar Generation BESS | — | 14.7 km |
| Lower Snake River Wind Energy Project | 343 MW | 17 km |
| Tucannon River Wind Farm | 267 MW | 19.8 km |
| Little Goose | 810 MW | 30.1 km |
| Lower Granite | 810 MW | 41.4 km |