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.
Online Now
10,306 MW
89.4% of 11,533 MW installed
Fleet Availability
89.4%
nuclear generating ÷ installed
Units in Outage
1
at a full outage (0% power)
Units Derated
0
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
85.0%
availability
6,953 MW
online of 8,181
1,227 MW
offline
7 units:
6 at power
1 in outage
Top markets
TVA 8,181 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 | 7 | 8,181 | 6,953 | 85.0% | 1,227 | 1 / 0 | TVA |
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 (7 units, 6,953 MW online) | ||||||
| Browns Ferry 1 | TVA | AL | 0.0% | 1,227 | 1,227 | Outage |
| 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 |
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.