Marengo Wind Plant — United States of America

Marengo Wind Plant is a 234 MW wind power station in Washington, United States of America. It is operated by PacifiCorp. Based on reported annual generation of 235 GWh, it can supply roughly 67k homes. It ranks #1811 of 10,884 United States of America power plants by installed capacity. Commissioned in 2007, it is around 19 years old — relatively modern. As a non-combustion source, it has no direct CO₂ emissions from generation. In context, wind supplies about 10.3% of United States of America's electricity; the national grid averages 384 gCO₂/kWh (43.0% low-carbon) (2025).

Plant data: WRI Global Power Plant Database (CC BY 4.0), id USA0056466.

Data provenance

Source of the capacity and fuel values:

capacity: GEM · 2026 · L100000906800; fuel: WRI GPPD

In context: how this plant compares

At 234 MW, Marengo Wind Plant is well above the median wind plant in United States of America (67.7 MW). Wind turbines convert moving air into electricity; output is variable and site-dependent, and modern turbines deliver some of the lowest-cost new generation on many grids.

Capacity comparison computed from the WRI Global Power Plant Database; fuel-type context is general engineering background.

Key facts

Load factor

11%, from 235 GWh of reported generation; the median for 1120 wind plants in United States of America that report generation is 30%

Generation trend

486 GWh in 2013 and 235 GWh in 2019 (−52%)

Highest and lowest year

2014: 542 GWh; 2019: 235 GWh

Share of United States of America wind capacity

0.2% of 104,873 MW across 1,139 plants in this dataset

Age among peers

215 of 1,139 dated wind plants in United States of America are older

Calculated from the capacity and generation records in this dataset (WRI Global Power Plant Database (CC BY 4.0)).

Reported generation trend

Annual generation (GWh), WRI Global Power Plant Database (CC BY 4.0).

Owner

Operated by PacifiCorp. All plants by this company →

Local climate & thermal context

This wind plant converts the kinetic energy of wind into electricity through turbine rotors. It sits in a warm-summer Mediterranean climate (Köppen Csb) — Northern Hemisphere, latitude 46.4°N — which shapes how much energy it can produce and how its output varies through the year.

Monthly mean temperature

Heating degree-days here run 29% above the median power plant in this dataset — a proxy for how much extra energy heated equipment must replace through its surfaces in winter.

Climate heat-demand index: 67/100 — this site sits in the top third of the power plants we cover by heating degree-days.

Climate normals: WorldClim 2.1 (1970–2000 monthly normals, 10 arc-min, CC BY 4.0); zone: Köppen-Geiger world climate classification (Kottek et al. 2006, 0.5° grid). Degree-days & heat-demand index computed by PowerAtlas — a modelled heat-demand proxy, not a measured site figure.

Site climate & environmental severity

This site sits in a mild atmospheric environment (estimated ISO 9223 class C2 — Low), with humidity / wetness the leading environmental stress.

Indicative estimate via the ISO 9223:2012 informative method (atmospheric corrosivity from temperature, time-of-wetness and airborne salinity), using WorldClim climate normals, the Köppen-Geiger class and coast distance. Indicative, not a measured corrosion rate.

How it compares & nearby plants

The #83 largest wind power plant of 1139 in United States of America by capacity.

United States of America has 1139 wind power plants in this dataset, together about 104,873 MW of capacity.

Nearby power plants

• Hopkins Ridge Wind · Wind · 149.4 MW · Washington
• Lower Snake River Wind Energy Project · Wind · 342.7 MW · Washington
• Tucannon River Wind Farm · Wind · 266.8 MW · Washington
• Little Goose · Hydro · 810 MW · Washington
• Lower Granite · Hydro · 810 MW · Washington
• Twin Reservoirs · Hydro · 2.2 MW · Washington

Location

Coordinates 46.3847, -117.762 from WRI Global Power Plant Database (CC BY 4.0). View on OpenStreetMap.

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