Hanul

Hanul is a 5,900 MW nuclear power station in Gangwon-do, South Korea. It is operated by Korea Hydro and Nuclear. Based on its capacity (estimated), it can supply roughly 13,290,171 homes (estimated). It ranks #2 of 204 South Korea power plants by installed capacity. As a non-combustion source, it has no direct CO₂ emissions from generation. In context, nuclear supplies about 29.6% of South Korea's electricity; the national grid averages 417 gCO₂/kWh (40.0% low-carbon) (2025).

Plant data: WRI Global Power Plant Database (CC BY 4.0), id WRI1000218.

Capacity vs largest nuclear plants in South Korea

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

Owner

Operated by Korea Hydro and Nuclear. All plants by this company →

Local climate & thermal context

This nuclear plant uses heat from nuclear fission to raise steam for a turbine-generator. It sits in a humid subtropical climate (Köppen Cfa) — Northern Hemisphere, latitude 37.1°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 1% 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: 50/100 — this site sits in the mid third of the power plants we cover by heating degree-days.

In colder climates, uninsulated hot equipment (boilers, turbines, valves, steam lines) loses proportionally more heat to ambient air — exactly the loss Inzonex modular insulation is designed to cut.

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.

How it compares & nearby plants

The #2 largest nuclear power plant of 6 in South Korea by capacity.

South Korea has 6 nuclear power plants in this dataset, together about 23,076 MW of capacity.

Nearby power plants

• Samcheok Green power station · Coal · 2,044 MW · Gangwon-do
• Seokmun power station · Biomass · 39 MW · Gangwon-do
• Samcheok Blue power station · Coal · 1,050 MW · Gangwon-do
• Taebaek Wind park · Wind · 18 MW · Gangwon-do
• Bukpyung power station · Coal · 1,190 MW · Gangwon-do
• Donghae PV · Solar · 1 MW · Gangwon-do

Location

Coordinates 37.0931, 129.383 from WRI Global Power Plant Database (CC BY 4.0). View on OpenStreetMap.