Fleet by NRC Region · updated daily
Regions
The U.S. nuclear fleet across the NRC's four regulatory regions. As of Sep 17, 2026 · Updated every morning from the NRC Daily Power Reactor Status Report.
Online Now
15,252 MW
89.9% of 16,974 MW installed
Fleet Availability
89.9%
nuclear generating ÷ installed
Units in Outage
1
at a full outage (0% power)
Units Derated
2
running below 98% power
Region I
Northeast
King of Prussia, PA
100.0%
availability
3,352 MW
online of 3,352
0 MW
offline
3 units:
3 at power
Top markets
ISO-NE 3,352 MW
Region II
Southeast
Atlanta, GA
86.3%
availability
10,075 MW
online of 11,673
1,598 MW
offline
12 units:
10 at power
1 derated 1 in outage
Top markets
Southern 8,080 MW
Duke Progress 3,593 MW
Region IV
West / South-Central
Arlington, TX
93.7%
availability
1,825 MW
online of 1,948
123 MW
offline
2 units:
1 at power
1 derated
Top markets
SPP 1,948 MW
Region Summary
| Region | Coverage | Units | Capacity | Online | Availability | MW Offline | Offline / Derated | Top markets |
|---|---|---|---|---|---|---|---|---|
| Region I | Northeast | 3 | 3,352 | 3,352 | 100.0% | — | 0 / 0 | ISO-NE |
| Region II | Southeast | 12 | 11,673 | 10,075 | 86.3% | 1,598 | 1 / 1 | SouthernDuke Progress |
| Region IV | West / South-Central | 2 | 1,948 | 1,825 | 93.7% | 123 | 0 / 1 | SPP |
NRC regions are administrative areas of the U.S. Nuclear Regulatory Commission, derived here from each plant's state. Availability = generating MW ÷ installed MW.
Fleet by Region
Every reporting unit, grouped by region, biggest supply loss first| Unit | Market | State | Power | Capacity | MW offline | Status |
|---|---|---|---|---|---|---|
| Region I · Northeast (3 units, 3,352 MW online) | ||||||
| Seabrook 1 | ISO-NE | NH | 100.0% | 1,246 | — | At power |
| Millstone 3 | ISO-NE | CT | 100.0% | 1,243 | — | At power |
| Millstone 2 | ISO-NE | CT | 100.0% | 863 | — | At power |
| Region II · Southeast (12 units, 10,075 MW online) | ||||||
| Vogtle 2 | Southern | GA | 0.0% | 1,152 | 1,152 | Outage |
| Vogtle 3 | Southern | GA | 60.0% | 1,114 | 446 | Derated |
| Vogtle 1 | Southern | GA | 100.0% | 1,150 | — | At power |
| Vogtle 4 | Southern | GA | 100.0% | 1,114 | — | At power |
| Harris 1 | Duke Progress | NC | 100.0% | 964 | — | At power |
| Brunswick 1 | Duke Progress | NC | 100.0% | 938 | — | At power |
| Brunswick 2 | Duke Progress | NC | 100.0% | 932 | — | At power |
| Farley 2 | Southern | AL | 100.0% | 896 | — | At power |
| Farley 1 | Southern | AL | 100.0% | 895 | — | At power |
| Hatch 2 | Southern | GA | 100.0% | 883 | — | At power |
| Hatch 1 | Southern | GA | 100.0% | 876 | — | At power |
| Robinson 2 | Duke Progress | SC | 100.0% | 759 | — | At power |
| Region IV · West / South-Central (2 units, 1,825 MW online) | ||||||
| Cooper | SPP | NE | 84.0% | 772 | 123 | Derated |
| Wolf Creek 1 | SPP | KS | 100.0% | 1,177 | — | At power |