Ohma
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.
1 unit: 1 under construction.
| Unit | Type | Model | Net MWe | Construction | Grid | Commercial Op | Shutdown | Status |
|---|---|---|---|---|---|---|---|---|
| Ohma | BWR | ABWR | 1,328 | 2010-05-07 | Under Construction |
Capacity, milestones and suppliers
| Unit | Design MWe | Gross MWe | Thermal MWt | First Criticality | Reactor Supplier | Turbine Supplier | Notes |
|---|---|---|---|---|---|---|---|
| Ohma | 1,328 | 1,383 | 3,926 | Hitachi GE Nuclear Energy, Ltd. | TOSHIBA CORPORATION |
Operator: ELECTRIC POWER DEVELOPMENT CO., LTD.
Owner: ELECTRIC POWER DEVELOPMENT CO., LTD.
Source: IAEA Power Reactor Information System (PRIS), as of 2026-10-14.
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.
41.507, 140.909
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: Oma Nuclear Power Plant.
Ohma Nuclear Power Plant is at Oma, Aomori Prefecture, Japan, on the Tsugaru Strait.
Read more
The plant was designed around a single advanced boiling water reactor of 1,383 MW that can run on a full MOX fuel core, following a 1995 decision of the Japanese Atomic Energy Commission. Construction began on 7 May 2010. It was suspended after the March 2011 Fukushima Daiichi accident and resumed in October 2012. The main reactor building reached its full height in March 2013.