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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11,562 MW
99.0% of 11,678 MW installed
Fleet Availability
99.0%
nuclear generating ÷ installed
Units in Outage
0
at a full outage (0% power)
Units Derated
1
running below 98% power
Region II
Southeast
Atlanta, GA
100.0%
availability
3,593 MW
online of 3,593
0 MW
offline
4 units:
4 at power
Top markets
Duke Progress 3,593 MW
Region IV
West / South-Central
Arlington, TX
98.6%
availability
7,969 MW
online of 8,085
116 MW
offline
7 units:
6 at power
1 derated
Top markets
ERCOT 4,986 MW
SPP 1,948 MW
BPA 1,151 MW
Region Summary
| Region | Coverage | Units | Capacity | Online | Availability | MW Offline | Offline / Derated | Top markets |
|---|---|---|---|---|---|---|---|---|
| Region II | Southeast | 4 | 3,593 | 3,593 | 100.0% | — | 0 / 0 | Duke Progress |
| Region IV | West / South-Central | 7 | 8,085 | 7,969 | 98.6% | 116 | 0 / 1 | ERCOTSPPBPA |
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 II · Southeast (4 units, 3,593 MW online) | ||||||
| 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 |
| Robinson 2 | Duke Progress | SC | 100.0% | 759 | — | At power |
| Region IV · West / South-Central (7 units, 7,969 MW online) | ||||||
| Cooper | SPP | NE | 85.0% | 772 | 116 | Derated |
| South Texas 1 | ERCOT | TX | 100.0% | 1,300 | — | At power |
| South Texas 2 | ERCOT | TX | 100.0% | 1,280 | — | At power |
| Comanche Peak 1 | ERCOT | TX | 100.0% | 1,209 | — | At power |
| Comanche Peak 2 | ERCOT | TX | 100.0% | 1,197 | — | At power |
| Wolf Creek 1 | SPP | KS | 100.0% | 1,177 | — | At power |
| Columbia Generating Station | BPA | WA | 100.0% | 1,151 | — | 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.