Exelon Generation's Quad Cities 1 nuclear reactor in Cordova, Illinois, was back at 100% capacity Wednesday after reducing output overnight, an Exelon spokesman said.
Exelon reduced output at the the 912 MW unit in coordination with regional grid operator PJM Interconnection because of "transmission line constraints," Exelon spokesman Neal Miller said in an email.
As a result, Quad Cities-1 was operating at 95% early Wednesday, the US Nuclear Regulatory Commission said in its daily reactor status report.
The unit's output had also been reduced Monday night for the same reason, but Quad Cities 1 was operating at 100% by early Tuesday afternoon, Miller said Tuesday.
The adjacent 994 MW Quad Cities 2 shut March 21 for a scheduled refueling and maintenance outage and remains out of service, according to NRC's report.
Exelon has temporarily reduced the nighttime output of one or more of the four nuclear units at the Byron and Quad Cities plants because of transmission line constraints numerous times since October.
Exelon and PJM previously said they have been experiencing intermittent grid congestion in the region because of transmission line outages for scheduled maintenance.
