Seven Mile Hill — United States of America

Seven Mile Hill is a 146 MW wind power station in Wyoming, United States of America. It is operated by PacifiCorp. Based on reported annual generation of 386 GWh, it can supply roughly 110k homes. It ranks #2336 of 10,884 United States of America power plants by installed capacity. Commissioned in 2009, it is around 17 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 USA0056843.

Data provenance

Source of the capacity and fuel values:

capacity: GEM · 2026 · L100000906403; fuel: WRI GPPD

In context: how this plant compares

At 146 MW, Seven Mile Hill 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

30%, from 386 GWh of reported generation, in line with the 30% median for 1120 wind plants in United States of America

Generation trend

433 GWh in 2013 and 386 GWh in 2019 (−11%)

Highest and lowest year

2013: 433 GWh; 2015: 361 GWh

Share of United States of America wind capacity

0.1% of 104,873 MW across 1,139 plants in this dataset

Age among peers

346 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 humid continental climate (Köppen Dfb) — Northern Hemisphere, latitude 41.9°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 78% 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: 89/100 — 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 #317 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

• Medicine Bow · Wind · 6.2 MW · Wyoming
• Dunlap · Wind · 111 MW · Wyoming
• Rock River I LLC · Wind · 50 MW · Wyoming
• Foote Creek IV · Wind · 16.8 MW · Wyoming
• Foote Creek III · Wind · 24.8 MW · Wyoming
• Foote Creek II · Wind · 1.8 MW · Wyoming

Location

Coordinates 41.9203, -106.3758 from WRI Global Power Plant Database (CC BY 4.0). View on OpenStreetMap.

Frequently asked questions