Fleet by NRC Region · updated daily
Regions
The U.S. nuclear fleet across the NRC's four regulatory regions. As of Sep 15, 2026 · Updated every morning from the NRC Daily Power Reactor Status Report.
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16,116 MW
92.5% of 17,422 MW installed
Fleet Availability
92.5%
nuclear generating ÷ installed
Units in Outage
1
at a full outage (0% power)
Units Derated
1
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
89.0%
availability
10,523 MW
online of 11,830
1,306 MW
offline
11 units:
9 at power
1 derated 1 in outage
Top markets
TVA 8,181 MW
FPL 3,649 MW
Region IV
West / South-Central
Arlington, TX
100.0%
availability
2,240 MW
online of 2,240
0 MW
offline
2 units:
2 at power
Top markets
CAISO 2,240 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 | 11 | 11,830 | 10,523 | 89.0% | 1,306 | 1 / 1 | TVAFPL |
| Region IV | West / South-Central | 2 | 2,240 | 2,240 | 100.0% | — | 0 / 0 | CAISO |
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 (11 units, 10,523 MW online) | ||||||
| Browns Ferry 1 | TVA | AL | 0.0% | 1,227 | 1,227 | Outage |
| Saint Lucie 2 | FPL | FL | 92.0% | 987 | 79 | Derated |
| Browns Ferry 3 | TVA | AL | 100.0% | 1,227 | — | At power |
| Browns Ferry 2 | TVA | AL | 100.0% | 1,208 | — | At power |
| Sequoyah 1 | TVA | TN | 100.0% | 1,148 | — | At power |
| Sequoyah 2 | TVA | TN | 100.0% | 1,126 | — | At power |
| Watts Bar 1 | TVA | TN | 100.0% | 1,123 | — | At power |
| Watts Bar 2 | TVA | TN | 100.0% | 1,122 | — | At power |
| Saint Lucie 1 | FPL | FL | 100.0% | 981 | — | At power |
| Turkey Point 4 | FPL | FL | 100.0% | 844 | — | At power |
| Turkey Point 3 | FPL | FL | 100.0% | 837 | — | At power |
| Region IV · West / South-Central (2 units, 2,240 MW online) | ||||||
| Diablo Canyon 1 | CAISO | CA | 100.0% | 1,122 | — | At power |
| Diablo Canyon 2 | CAISO | CA | 100.0% | 1,118 | — | At power |
Ontario (IESO) separate fleet
Ontario detailMW Offline
3,632 MW
29.9% of the Ontario fleet
Units Offline
4 of 16
Bruce, Darlington, Pickering
Delivering
8,528 MW
of 12,160 MW installed
Resolution
1 hour
vs. once-daily for the U.S. fleet
Ontario is not an NRC region, so it sits outside the table above. Ontario is reported as a separate fleet and is never added into the U.S. national figures above. IESO grid-operator market data (MW delivered), not NRC percent-power.