Onagawa nuclear power plant

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Onagawa nuclear power plant is a mothballed nuclear power plant in Oshika County, Japan.

Project Details

Table 1: Unit-level project details for Onagawa nuclear power plant

Unit name	Status	Commissioning year	Retirement year	Nameplate capacity	Reactor type	Model	Owner	Operator
1	Retired	1984	2018	524 MW	Boiling water reactor	BWR-4	Tohoku Electric Power CO INC [100%]	Tohoku Electric Power CO INC
2	Mothballed	1995	–	825 MW	Boiling water reactor	BWR-5	Tohoku Electric Power CO INC [100%]	Tohoku Electric Power CO INC
3	Mothballed	2002	–	825 MW	Boiling water reactor	BWR-5	Tohoku Electric Power CO INC [100%]	Tohoku Electric Power CO INC

Table 2: Additional unit-level timeline details for Onagawa nuclear power plant

Unit name	Construction start	First criticality (more info)	First grid connection	Commercial operation	Retirement date
1	July 8, 1980	October 18, 1983	November 18, 1983	June 1, 1984	December 21, 2018
2	April 12, 1991	November 2, 1994	December 23, 1994	July 28, 1995	–
3	January 23, 1998	April 26, 2001	May 30, 2001	January 30, 2002	–

Table 3: Additional unit-level capacity details for Onagawa nuclear power plant

(Read more about nuclear capacity definitions.)

Unit name	Reference net capacity	Design net capacity	Thermal capacity
1	498 MW	498 MW	1593 MWt
2	796 MW	796 MW	2436 MWt
3	796 MW	796 MW	2436 MWt

Location

Table 4: Unit-level location details for Onagawa nuclear power plant

Unit name	Location	Coordinates (WGS 84)
1	Oshika County, Japan	38.3987, 141.5003 (exact)
2	Oshika County, Japan	38.3987, 141.5003 (exact)
3	Oshika County, Japan	38.3987, 141.5003 (exact)

The map below shows the exact location of the nuclear power plant:

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Background

In 2018, Tohoku announced that they would decommission rather than upgrade Unit 1 of the Onagawa nuclear plant. Units 2 and 3 have been shut down since the Fukushima disaster in 2011. Tohoku plans to restart Unit 2 by September 2024, but the process has been facing delays on account of additional safety construction works. Restarting operations would mark the first nuclear plant to reopen in the eastern region since 2011.

Articles and Resources

Additional data

To access additional data, including an interactive map of global nuclear power plants, a downloadable dataset, and summary data, please visit the Global Nuclear Power Tracker on the Global Energy Monitor website.