Marengo Wind Plant
Wind power plant in Columbia County, Washington. 234 MW of nameplate capacity across 2 generators, operated by PacifiCorp.
Also known as Marengo I · Marengo II · EIA plant 56466
Analyst: free account, 1 question a day.
Key facts
- Capacity
- 234 MWNameplate
- Generators
- 2 operatingEIA-860M, August 2026
- Operating since
- August 2007First generator online
- Operator
- PacifiCorpEIA operator ID 14354
- Grid
- PACWBalancing authority PACW
- Price nodes
- None linkedNo verified ISO node
- Location
- Columbia County, WA46.3747, −117.7772
- EIA plant ID
- 56466EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Marengo Wind Plant produces
Free · EIA-923Net generation, 2025
613 GWh
612,625 MWh, final
Capacity factor, 2025
29.9%
2024: 33.7%
January to July 2026
Not reported
Provisional. 0 of 7 months reported
Range, 2015 to 2025
234.7–732.3
GWh a year. Low 2019, high 2021
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | Not reported | Not reported | 0 of 12 |
| 2001 | Not reported | Not reported | 0 of 12 |
| 2002 | Not reported | Not reported | 0 of 12 |
| 2003 | Not reported | Not reported | 0 of 12 |
| 2004 | Not reported | Not reported | 0 of 12 |
| 2005 | Not reported | Not reported | 0 of 12 |
| 2006 | Not reported | Not reported | 0 of 12 |
| 2007 | 160,636 | Not reported | 12 of 12 |
| 2008 | 478,702 | Not reported | 12 of 12 |
| 2009 | 474,831 | Not reported | 12 of 12 |
| 2010 | 496,418 | 26.9% | 12 of 12 |
| 2011 | 597,786 | 32.4% | 12 of 12 |
| 2012 | 536,221 | 29.0% | 12 of 12 |
| 2013 | 485,852 | 26.3% | 12 of 12 |
| 2014 | 542,305 | 29.4% | 12 of 12 |
| 2015 | 436,657 | 23.7% | 12 of 12 |
| 2016 | 526,422 | 28.5% | 12 of 12 |
| 2017 | 468,904 | 25.4% | 12 of 12 |
| 2018 | 500,862 | 27.1% | 12 of 12 |
| 2019 | 234,734 | 12.7% | 12 of 12 |
| 2020 | 648,830 | Not reported | 12 of 12 |
| 2021 | 732,284 | 35.7% | 12 of 12 |
| 2022 | 588,133 | 28.7% | 12 of 12 |
| 2023 | 560,568 | 27.3% | 12 of 12 |
| 2024 | 692,749 | 33.7% | 12 of 12 |
| 2025 | 612,625 | 29.9% | 12 of 12 |
| 2026 (provisional, partial year) | Not reported | Not reported | 0 of 7 |
* 2026 covers January to July and is provisional. Capacity factor is net generation divided by nameplate capacity times the hours of each reported month.
Power prices and basis
Free accountNo verified ISO price node is linked to this plant, or its price history could not load.
Emissions
Free · EPA CAMPDNo EPA emissions units are linked to this plant.
Water use
Free · EIA-923 cooling, USGSNo EIA cooling-water record for this plant in 2024. Plants without steam cooling, such as wind, solar and batteries, do not report cooling water.
Generators
Free · EIA-860M| Generator | Technology | Nameplate MW | Online since |
|---|---|---|---|
| 1 | Onshore Wind Turbine | 156.0 | August 2007 |
| 2 | Onshore Wind Turbine | 78.0 | January 2008 |
Ownership and offtake
ProOwnership and offtake are part of Pro
Owners and their shares, parent companies, and power purchase agreements with their buyers. EIA-860M lists PacifiCorp as the operator, which is not always the owner.
Modeled data
ProPro adds modeled values for this plant. Everything above stays free.
Modeled curtailment
A range, not one number. The lower bound counts hours inside the production tax credit window; the upper bound is the no-credit case.
Expected vs reported generation
Monthly modeled expected output and physical potential next to EIA-923 reported output.
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Power plants near Marengo Wind Plant
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Questions about Marengo Wind Plant
How much power does Marengo Wind Plant produce?
Marengo Wind Plant reported 612,625 MWh (613 GWh) of net generation in 2025, a 29.9% capacity factor on 234 MW of nameplate capacity.
Where is Marengo Wind Plant?
Marengo Wind Plant is in Columbia County, Washington, at 46.3747, −117.7772. It is in the PacifiCorp - West balancing area (PACW).
Who operates Marengo Wind Plant?
EIA-860M for August 2026 lists PacifiCorp as the operator (EIA operator ID 14354). The operator is not always the owner.
When did Marengo Wind Plant start operating?
Its first generator began operating in August 2007, according to EIA-860M.
Sources
- EIA-860 2025 (final) and EIA-860M August 2026: plant, generators, capacity, operator and location
- EIA-923 monthly net generation, 2000 to July 2026 (2026 provisional)
- Project names from the USGS U.S. Wind Turbine Database
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page