Onagawa
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.
3 units: 1 operational, 1 suspended operation, 1 permanent shutdown.
Net capacity in service: 1,592 MWe.
| Unit | Type | Model | Net MWe | Construction | Grid | Commercial Op | Shutdown | Status |
|---|---|---|---|---|---|---|---|---|
| Onagawa 1 | BWR | BWR-4 | 498 | 1980-07-08 | 1983-11-18 | 1984-06-01 | 2018-12-21 | Permanent Shutdown |
| Onagawa 2 | BWR | BWR-5 | 796 | 1991-04-12 | 1994-12-23 | 1995-07-28 | Operational | |
| Onagawa 3 | BWR | BWR-5 | 796 | 1998-01-23 | 2001-05-30 | 2002-01-30 | Suspended Operation |
Capacity, milestones and suppliers
| Unit | Design MWe | Gross MWe | Thermal MWt | First Criticality | Reactor Supplier | Turbine Supplier | Notes |
|---|---|---|---|---|---|---|---|
| Onagawa 1 | 496 | 524 | 1,593 | 1983-10-18 | TOSHIBA CORPORATION | TOSHIBA CORPORATION | Decommissioning from 2020-07-28 |
| Onagawa 2 | 796 | 825 | 2,436 | 1994-11-02 | TOSHIBA CORPORATION | TOSHIBA CORPORATION | Suspended 2011-03-11; Restarted 2024-11-15 |
| Onagawa 3 | 796 | 825 | 2,436 | 2001-04-26 | TOSHIBA CORPORATION | HITACHI, LTD. | Suspended 2011-03-11 |
Operator: Tohoku Electric Power Co., Inc
Owner: Tohoku Electric Power Co., Inc
Source: IAEA Power Reactor Information System (PRIS), as of 2026-10-12.
Working Here
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.
38.4011, 141.5
Location & Contact
Physical address, phone number, and website for this facility. Use the directions link to get driving directions via Google Maps.