Genkai
Reactor Data
Reactor Units
Every power reactor at this site as listed in the IAEA Power Reactor Information System (PRIS): reactor type and model, net electrical capacity, grid connection and commercial operation dates, and current status.
4 units: 2 operational, 2 permanent shutdown.
Net capacity in service: 2,254 MWe.
| Unit | Type | Model | Net MWe | Construction | Grid | Commercial Op | Shutdown | Status |
|---|---|---|---|---|---|---|---|---|
| Genkai 1 | PWR | M (2-loop) | 529 | 1971-09-15 | 1975-02-14 | 1975-10-15 | 2015-04-27 | Permanent Shutdown |
| Genkai 2 | PWR | M (2-loop) | 529 | 1977-02-01 | 1980-06-03 | 1981-03-30 | 2019-04-09 | Permanent Shutdown |
| Genkai 3 | PWR | M (4-loop) | 1,127 | 1988-06-01 | 1993-06-15 | 1994-03-18 | Operational | |
| Genkai 4 | PWR | M (4-loop) | 1,127 | 1992-07-15 | 1996-11-12 | 1997-07-25 | Operational |
Capacity, milestones and suppliers
| Unit | Design MWe | Gross MWe | Thermal MWt | First Criticality | Reactor Supplier | Turbine Supplier | Notes |
|---|---|---|---|---|---|---|---|
| Genkai 1 | 529 | 559 | 1,650 | 1975-01-28 | MITSUBISHI HEAVY INDUSTRIES, LTD. | MITSUBISHI HEAVY INDUSTRIES, LTD. | Decommissioning from 2017-04-19 |
| Genkai 2 | 529 | 559 | 1,650 | 1980-05-21 | MITSUBISHI HEAVY INDUSTRIES, LTD. | MITSUBISHI HEAVY INDUSTRIES, LTD. | Decommissioning from 2020-03-18 |
| Genkai 3 | 1,127 | 1,180 | 3,423 | 1993-05-28 | MITSUBISHI HEAVY INDUSTRIES, LTD. | MITSUBISHI HEAVY INDUSTRIES, LTD. | |
| Genkai 4 | 1,127 | 1,180 | 3,423 | 1996-10-23 | MITSUBISHI HEAVY INDUSTRIES, LTD. | MITSUBISHI HEAVY INDUSTRIES, LTD. |
Lifetime performance, through 2025
| Unit | Electricity Supplied | Load Factor | Energy Availability | Operating Factor |
|---|---|---|---|---|
| Genkai 1 | 127.7 TWh | 68.4% | 67.7% | 69.0% |
| Genkai 2 | 118.2 TWh | 64.5% | 63.7% | 64.2% |
| Genkai 3 | 209.8 TWh | 64.8% | 63.7% | 64.0% |
| Genkai 4 | 186.4 TWh | 65.6% | 64.7% | 65.0% |
Operator: Kyushu Electric Power Co., Inc.
Owner: Kyushu Electric Power Co., Inc.
Source: IAEA Power Reactor Information System (PRIS), as of 2026-10-19.
Working Here
Per Diem Rates FY 2026
Per diem covers lodging and meals & incidental expenses (M&IE) for government and contractor travel near this facility. Rates are from the U.S. State Department foreign per diem tables for FY 2026.
$208
Lodging/Night
$107
M&IE/Day
$315
Total/Day
Japan: rate for locations the State Department does not list separately
U.S. Department of State foreign per diem, for U.S. government and contractor travel.
Photos
Photos of this facility from the NukeWorker photo gallery. Click the header or any photo to browse the full album.
Facility Map
Interactive satellite map showing the facility's geographic location. Marker color indicates current status: green for online, red for offline, orange for reduced power. Click the header to open in Google Maps satellite view.
33.5152, 129.836
Location & Contact
Physical address, phone number, and website for this facility. Use the directions link to get driving directions via Google Maps.
Plant Facts
About This Site
Written by NukeWorker from public records: facts that do not change. Operator, status and capacity come from the live data elsewhere on this page. Sources: Wikipedia: Genkai Nuclear Power Plant.
Genkai Nuclear Power Plant is in the town of Genkai, Higashimatsuura District, Saga Prefecture, on the island of Kyushu, Japan.
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Construction began on 15 September 1971. All four units are pressurized water reactors supplied by Mitsubishi Heavy Industries. Unit 1 was connected to the grid on 14 February 1975, Unit 2 on 3 June 1980, Unit 3 on 15 June 1993 and Unit 4 on 12 November 1996. Unit 1 was permanently shut down on 27 April 2015 and Unit 2 on 9 April 2019.