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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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35,901 MW
94.5% of 37,992 MW installed
Fleet Availability
94.5%
nuclear generating ÷ installed
Units in Outage
2
at a full outage (0% power)
Units Derated
3
running below 98% power
Region I

Northeast

King of Prussia, PA
100.0%
availability
17,651 MW
online of 17,651
0 MW
offline
16 units: 16 at power
Top markets
PJM 14,298 MW ISO-NE 3,352 MW
Region II

Southeast

Atlanta, GA
73.6%
availability
2,624 MW
online of 3,567
943 MW
offline
4 units: 3 at power 1 in outage
Top markets
PJM 3,567 MW
Region III

Midwest

Lisle, IL
93.3%
availability
13,830 MW
online of 14,826
996 MW
offline
14 units: 11 at power 2 derated 1 in outage
Top markets
PJM 14,826 MW
Region IV

West / South-Central

Arlington, TX
94.1%
availability
1,832 MW
online of 1,948
116 MW
offline
2 units: 1 at power 1 derated
Top markets
SPP 1,948 MW

Region Summary

RegionCoverageUnitsCapacity OnlineAvailability MW OfflineOffline / DeratedTop markets
Region I Northeast 16 17,651 17,651 100.0% — 0 / 0 PJMISO-NE
Region II Southeast 4 3,567 2,624 73.6% 943 1 / 0 PJM
Region III Midwest 14 14,826 13,830 93.3% 996 1 / 2 PJM
Region IV West / South-Central 2 1,948 1,832 94.1% 116 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
UnitMarketStatePowerCapacityMW offlineStatus
Region I · Northeast (16 units, 17,651 MW online)
Peach Bottom 3 PJM PA 100.0% 1,285 — At power
Peach Bottom 2 PJM PA 99.0% 1,265 — At power
Susquehanna 1 PJM PA 100.0% 1,247 — At power
Susquehanna 2 PJM PA 100.0% 1,247 — At power
Seabrook 1 ISO-NE NH 100.0% 1,246 — At power
Millstone 3 ISO-NE CT 100.0% 1,243 — At power
Hope Creek 1 PJM NJ 98.0% 1,172 — At power
Salem 1 PJM NJ 100.0% 1,146 — At power
Salem 2 PJM NJ 100.0% 1,142 — At power
Limerick 2 PJM PA 100.0% 1,122 — At power
Limerick 1 PJM PA 100.0% 1,120 — At power
Beaver Valley 1 PJM PA 100.0% 907 — At power
Beaver Valley 2 PJM PA 100.0% 901 — At power
Calvert Cliffs 1 PJM MD 100.0% 884 — At power
Millstone 2 ISO-NE CT 100.0% 863 — At power
Calvert Cliffs 2 PJM MD 100.0% 861 — At power
Region II · Southeast (4 units, 2,624 MW online)
North Anna 2 PJM VA 0.0% 943 943 Outage
North Anna 1 PJM VA 100.0% 948 — At power
Surry 1 PJM VA 100.0% 838 — At power
Surry 2 PJM VA 100.0% 838 — At power
Region III · Midwest (14 units, 13,830 MW online)
Davis-Besse PJM OH 0.0% 894 894 Outage
Byron 2 PJM IL 95.0% 1,136 57 Derated
Quad Cities 2 PJM IL 95.0% 911 46 Derated
Perry 1 PJM OH 100.0% 1,240 — At power
Braidwood 1 PJM IL 100.0% 1,183 — At power
D.C. Cook 2 PJM MI 100.0% 1,168 — At power
Byron 1 PJM IL 100.0% 1,164 — At power
Braidwood 2 PJM IL 100.0% 1,152 — At power
LaSalle 2 PJM IL 100.0% 1,134 — At power
LaSalle 1 PJM IL 100.0% 1,131 — At power
D.C. Cook 1 PJM MI 100.0% 1,009 — At power
Quad Cities 1 PJM IL 100.0% 908 — At power
Dresden 2 PJM IL 100.0% 902 — At power
Dresden 3 PJM IL 100.0% 895 — At power
Region IV · West / South-Central (2 units, 1,832 MW online)
Cooper SPP NE 85.0% 772 116 Derated
Wolf Creek 1 SPP KS 100.0% 1,177 — At power

Ontario (IESO) separate fleet

Ontario detail
MW 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.