H. Wilson Sundt Generating Station — United States of America

H. Wilson Sundt Generating Station is a 475.3 MW coal power station in Arizona, United States of America. It is operated by Tucson Electric Power Co [100%]. Based on its capacity (estimated), it can supply roughly 595k homes (estimated). It ranks #1267 of 10,884 United States of America power plants by installed capacity. Commissioned in 1967, it is around 59 years old — an older, legacy facility. 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 GEM_coa_hwilsonsundt_unite.

Data provenance

Source of the capacity and fuel values:

capacity: GEM · 2026 · L100000103790; fuel: GEM GCPT

In context: how this plant compares

At 475.3 MW, H. Wilson Sundt Generating Station is below the median coal plant in United States of America (558 MW). Technically it is described as subcritical. 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.

Key facts

Share of United States of America coal capacity

less than 0.1% of 621,194 MW across 802 plants in this dataset

Age among peers

247 of 745 dated coal 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)).

Capacity vs largest coal plants in United States of America

Installed capacity (MW), WRI Global Power Plant Database (CC BY 4.0).

Owner

Operated by Tucson Electric Power Co [100%].

Local climate & thermal context

This coal plant burns coal to raise high-pressure steam that spins a turbine-generator. It sits in a hot semi-arid steppe climate (Köppen BSh) — Northern Hemisphere, latitude 32.2°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 64% below 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: 25/100 — this site sits in the bottom 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 benign, low-corrosion environment (estimated ISO 9223 class C1 — Very low), with dust abrasion 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 #429 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.

Nearby power plants

• H Wilson Sundt Generating Station · Gas · 434.9 MW · Arizona
• Davis Monthan AFB (AZ) West Airfield · Solar · 12.6 MW · Arizona
• Valencia Solar · Solar · 10 MW · Arizona
• Actus Lend Lease DMAFB · Solar · 3 MW · Arizona
• Pima Community College - East Campus · Solar · 1.3 MW · Arizona
• Pima Community College · Solar · 1.1 MW · Arizona

Location

Coordinates 32.159761, -110.905125 from WRI Global Power Plant Database (CC BY 4.0). View on OpenStreetMap.

Frequently asked questions