Coal power plant in Minnesota, United States of America. Approximate location 47.2611, -93.6528.
CoalMinnesotaUnited States of AmericaCO₂ measured
Clay Boswell is a 922 MW coal power station in Minnesota, United States of America. It is operated by ALLETE Inc.. Based on reported annual generation of 4,811 GWh, it can supply roughly 1.4 million homes. It ranks #719 of 10,938 United States of America power plants by installed capacity. Commissioned in 1977, it is around 49 years old — long-established. Its annual emissions of 5,196,646 t CO₂/yr (US EPA GHGRP) are equivalent to about 1.2 million cars driven for a year. In context, coal supplies about 16.3% 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 USA0001893.
Known, modelled and calculated values are kept separate. Missing fields are shown as unavailable.
The capacity and/or fuel fields on this page include a source-backed provenance label from GEM, an official registry, Wikidata, OSM, or a cross-source match.
capacity: GEM tracker 2026 operating-unit sum (location L100000103998); fuel: WRI source-record fuel
At 922 MW, Clay Boswell is well above the median coal plant in United States of America (558 MW). Coal plants burn pulverised coal to raise high-pressure steam for a turbine; they run as baseload but are the most carbon-intensive mainstream source and the first targeted for retirement or efficiency retrofits.
Capacity comparison computed from the WRI Global Power Plant Database; fuel-type context is general engineering background.
This facility's annual emissions are roughly equivalent to:
Equivalencies via US EPA Greenhouse Gas Equivalencies; emissions per US EPA GHGRP (measured for US EPA/EU ETS, modelled for Climate TRACE).
Annual generation (GWh), WRI Global Power Plant Database (CC BY 4.0).
Operated by ALLETE Inc.. All plants by this company →
This coal plant burns coal to raise high-pressure steam that spins a turbine-generator. It sits in a warm-summer humid continental climate (Köppen Dfb) — Northern Hemisphere, latitude 47.3°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 110% 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: 95/100 — 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.
For a plant’s outdoor hardware — heat-recovery steam generators (HRSG), expansion joints, valves, flanges and their insulation — the local climate sets how fast unprotected steel and coatings degrade. This site sits in a mild atmospheric environment (estimated ISO 9223 class C2 — Low), with thermal cycling the leading environmental stress.
Higher environmental severity is exactly where protective removable insulation pays back most: a sheltered micro-climate slows corrosion, UV and thermal-cycling damage and extends outdoor hardware service life. This is an indicative site-climate context — not a condition assessment of any specific plant or operator.
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.
The #264 largest coal power plant of 802 in United States of America by capacity.
United States of America has 802 coal power plants in this dataset, together about 621,194 MW of capacity.
Coordinates 47.2611, -93.6528 from WRI Global Power Plant Database (CC BY 4.0). View on OpenStreetMap.
Clay Boswell is a 922 MW source-record coal power plant in Minnesota, United States of America, commissioned in 1977.
Clay Boswell generates about 4,811 GWh of electricity per year.
Its output is enough to supply roughly 1,374,571 homes.
Clay Boswell is operated by ALLETE Inc..
Clay Boswell has measured emissions of about 5,196,646 tonnes of CO₂ per year (US EPA GHGRP).
