World Power Plants

Ōi Nuclear Power Plant2,254 MW Nuclear

NuclearVerified: Feb 2026

The Ōi Nuclear Power Plant, commonly referred to by its local name, is a critical facility located in Japan at coordinates 35.5406° N and 135.6519° E. With a capacity of 2254 MW, this nuclear power plant plays a significant role in the energy generation landscape of Japan, especially following the country’s commitment to reducing carbon emissions and enhancing energy security. Operated by Kansai Electric Power Company, Ōi Nuclear Power Plant utilizes cutting-edge nuclear technology to provide a reliable source of electricity, which is vital for meeting the demands of both residential and industrial consumers in the region. The operational context of this facility is underscored by Japan's energy policy, which has evolved significantly since the Fukushima disaster in 2011, leading to a renewed focus on safety and sustainability in the nuclear sector. Located in the Fukui Prefecture, the plant is strategically important for the local grid, supplying substantial baseload power and contributing to regional energy stability. As Japan continues to balance its energy portfolio, the Ōi Nuclear Power Plant remains a key player in the country’s transition towards a more sustainable energy future, showcasing the complexities of nuclear energy within a context of public safety and environmental consciousness.

Capacity
2,254 MW

2.25 GW

Commissioning Year
1979

47 years old

Owner
Kansai Electric Power Company
Location
35.5406°, 135.6519°

Japan, Asia

Context & rankings
  • 38. largest of 662 plants in Japan
  • #640 worldwide by installed capacity
  • #167 of 514 Nuclear plants worldwide
  • 0.66% of the installed capacity of Japan
Age & fleet comparison

47 years in operation

Nuclear fleet average: 38.1 years

Operator portfolio

Kansai Electric Power Company operates 11 plants totalling 14,995 MW

Regional density

32 plants within 100 km, 27,045 MW combined

Nearest plant: Takahama Nuclear Power Plant (13.5 km)

Data provenance

Source: Wikidata

Location

Coordinates:: 35.540556, 135.651944
Open in Google Maps
Carbon Footprint

Zero Direct Emissions

Ōi Nuclear Power Plant is a nuclear power plant producing approximately 16783 GWh of clean electricity per year with zero direct CO₂ emissions during operation.

Lifecycle emissions: ~12 g CO₂/kWh (manufacturing, transport, decommissioning)

Technical Details

Primary Fuel Type
Nuclear
Energy Source
Non-Renewable
Country
Japan
Continent
Asia
Data Source
Global Power Plant Database

Ōi Nuclear Power Plant: A Critical Component of Japan's Energy Landscape

The Ōi Nuclear Power Plant, located in the Fukui Prefecture of Japan, is a significant facility in the country's energy sector, boasting a total capacity of 2,254 megawatts (MW). Owned and operated by Kansai Electric Power Company, this nuclear power plant plays a crucial role in providing a stable and substantial portion of Japan's electricity supply. Since its inception, the plant has been a pivotal player in Japan's strategy to achieve energy security and reduce reliance on fossil fuels, especially following the aftermath of the Fukushima Daiichi nuclear disaster in 2011, which led to increased scrutiny and debate over nuclear energy in the nation.

The Ōi Nuclear Power Plant primarily utilizes enriched uranium as its fuel source, which undergoes a process of nuclear fission to generate heat. This heat is then used to produce steam that drives turbines, converting thermal energy into electrical energy. The facility consists of multiple reactors, specifically two pressurized water reactors (PWRs), which are equipped with advanced safety systems designed to mitigate the risks of nuclear accidents. These reactors operate under stringent regulatory measures established by the Nuclear Regulation Authority of Japan, emphasizing safety and environmental protection.

In terms of environmental impact, nuclear power plants like Ōi are often viewed as a cleaner alternative to fossil fuel-based power generation. The plant produces significantly lower greenhouse gas emissions during operation, contributing to Japan's goals of reducing carbon emissions and combating climate change. However, the challenges of radioactive waste management and the potential risks associated with nuclear energy continue to be critical concerns for both the government and the public. The long-term storage and disposal of nuclear waste remain unresolved issues that necessitate careful consideration and planning.

Regionally, the Ōi Nuclear Power Plant is of great significance as it not only provides electricity to the Kansai region but also supports local economies through job creation and infrastructure development. The plant is a major employer in the area, providing direct and indirect employment opportunities for thousands of residents. Furthermore, the economic activity generated by the power plant extends to various sectors, including construction, maintenance, and services, thereby playing a vital role in the local economy.

Overall, the Ōi Nuclear Power Plant exemplifies the complexities and challenges of nuclear energy within Japan's broader energy landscape. As the country grapples with its energy policy in the wake of past crises, the role of nuclear power continues to be a focal point of national discussions, balancing the need for reliable energy sources with environmental and safety considerations.

JapanEnergy Profile

662
Total Plants
342.8 GW
Total Capacity
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