Three Mile Island nuclear power plant — United States of America
Nuclear power plant in Pennsylvania, United States of America. Approximate location 40.1539, -76.7248.
NuclearPennsylvaniaUnited States of AmericaB&W LLP (DRYAMB)pressurized water reactorPre Construction
Three Mile Island nuclear power plant is a 880 MW nuclear power station in Pennsylvania, United States of America. It ranks #697 of 10,884 United States of America power plants by installed capacity. As a non-combustion source, it has no direct CO₂ emissions from generation. In context, nuclear supplies about 17.4% 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_nuc_threemileisland_unite.
Data status
Known data
Calculated from dataset
Not available
Known, modelled and calculated values are kept separate. Missing fields are shown as unavailable.
Data provenance
Source of the capacity and fuel values:
capacity: GEM Global Nuclear Power Tracker September 2025 unit-status sum (pre-construction); fuel: GEM GNPT
In context: how this plant compares
At 880 MW, Three Mile Island nuclear power plant is below the median nuclear plant in United States of America (1,350 MW). Technically it is described as pressurized water reactor. Its current lifecycle status is “Pre Construction” — so it is not yet, or no longer, generating at full output. Nuclear plants split uranium to raise steam with no direct CO₂; they run as steady baseload with very high capacity factors and the longest operating lifetimes of any thermal plant.
Capacity comparison computed from the WRI Global Power Plant Database; fuel-type context is general engineering background.
How it compares & nearby plants
The #121 largest nuclear power plant of 176 in United States of America by capacity.
United States of America has 176 nuclear power plants in this dataset, together about 270,415 MW of capacity.
Nearby power plants
- York Haven · Hydro · 19.6 MW · Pennsylvania
- Brunner Island · Coal · 1,558.7 MW · Pennsylvania
- Brunner Island power station · Coal · 1,558.7 MW · Pennsylvania
- Phoenix Contact - CCHP Plant · Gas · 1 MW · Pennsylvania
- Lancaster County Resource Recovery · Waste · 35.7 MW · Pennsylvania
- Elizabethtown Solar · Solar · 2 MW · Pennsylvania
Location
Coordinates 40.1539, -76.7248 from WRI Global Power Plant Database (CC BY 4.0). View on OpenStreetMap.
Frequently asked questions
What type of power plant is Three Mile Island nuclear power plant?
Three Mile Island nuclear power plant is a 880 MW nuclear power plant in Pennsylvania, United States of America, Pre Construction 1974.