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
5,223 MW
97.8% of 5,339 MW installed
Fleet Availability
97.8%
nuclear generating ÷ installed
Units in Outage
0
at a full outage (0% power)
Units Derated
1
running below 98% power
Region IV
West / South-Central
Arlington, TX
97.8%
availability
5,223 MW
online of 5,339
116 MW
offline
5 units:
4 at power
1 derated
Top markets
CAISO 2,240 MW
SPP 1,948 MW
BPA 1,151 MW
Region Summary
| Region | Coverage | Units | Capacity | Online | Availability | MW Offline | Offline / Derated | Top markets |
|---|---|---|---|---|---|---|---|---|
| Region IV | West / South-Central | 5 | 5,339 | 5,223 | 97.8% | 116 | 0 / 1 | CAISOSPPBPA |
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 IV · West / South-Central (5 units, 5,223 MW online) | ||||||
| Cooper | SPP | NE | 85.0% | 772 | 116 | Derated |
| Wolf Creek 1 | SPP | KS | 100.0% | 1,177 | — | At power |
| Columbia Generating Station | BPA | WA | 100.0% | 1,151 | — | At power |
| 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.