Shin-Wolsong — South Korea

Shin-Wolsong is a 2,096 MW nuclear power station in Ulsan, South Korea. It is operated by Korea Hydro and Nuclear. Based on its capacity (estimated), it can supply roughly 4.7 million homes (estimated). It ranks #18 of 216 South Korea power plants by installed capacity. Commissioned in 2012, it is around 14 years old — relatively modern. 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 WRI1000216.

Data provenance

Source of the capacity and fuel values:

capacity: GEM · 2026 · L100000500126; fuel: WRI GPPD

In context: how this plant compares

At 2,096 MW, Shin-Wolsong is below the median nuclear plant in South Korea (3,000 MW). Technically it is described as pressurized water reactor. 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.

Key facts

Share of South Korea nuclear capacity

7.1% of 29,469 MW across 8 plants in this dataset

Age among peers

5 of 6 dated nuclear plants in South Korea are older

Calculated from the capacity and generation records in this dataset (WRI Global Power Plant Database (CC BY 4.0)).

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 35.7°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 3% 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: 49/100 — this site sits in the mid 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 an aggressive, high-corrosion environment (estimated ISO 9223 class C5 — Very high), with marine salt corrosion 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 #8 largest nuclear power plant of 8 in South Korea by capacity.

South Korea has 8 nuclear power plants in this dataset, together about 29,469 MW of capacity.

Nearby power plants

• Wolsong · Nuclear · 2,799 MW · Ulsan
• Hyundai Ulsan Factory power plant · Oil · 21.6 MW · Ulsan
• Yeongnam · Coal · 400 MW · Ulsan
• Ulsan GPS power station · Gas · 1,122 MW · Ulsan
• Ulsan · Oil · 3,000 MW · Ulsan
• Ulsan Hanju power station · Gas · 299.2 MW · Ulsan

Location

Coordinates 35.7221, 129.4786 from WRI Global Power Plant Database (CC BY 4.0). View on OpenStreetMap.

Frequently asked questions