BY CONTINUING TO USE THIS SITE, YOU ARE AGREEING TO OUR USE OF COOKIES. REVIEW OUR
COOKIE NOTICE

Register with us today

and in less than 60 seconds continue your access to: Latest news headlines Analytical topics and features Commodities videos, podcast & blogs Sample market prices & data Special reports Subscriber notes & daily commodity email alerts

Already have an account?

Log in to register

Forgot Password

Enter your Email ID below and we will send you an email with your password.


  • Email Address* Please enter email address.

If you are a premium subscriber, we are unable to send you your password for security reasons. Please contact the Client Services team.

If you are a Platts Market Center subscriber (https://pmc.platts.com), Please navigate to Platts Market Center to reset your password.

In this list
Electric Power

Exelon Generation cuts output at four Illinois nuclear units, two back at 100% power

Electric Power | Emissions | Metals | Non-Ferrous

Battery 'Gigafactories' and their impact on battery metals raw materials

Electric Power

Platts Market Data – Electric Power

Commodities | Electric Power | Metals

Battery Metals Conference, Inaugural

Electric Power

NYISO stakeholders clash over exclusion of REC holders from carbon price payments

Exelon Generation cuts output at four Illinois nuclear units, two back at 100% power

Exelon Generation reduced output Thursday night and Friday morning at four of its nuclear units in Illinois. At least three of ramped down because of low power prices in the PJM Interconnection market and transmission grid congestion, the company said. Two of those units have since returned to full-power operation, Exelon said.

Not registered?

Receive daily email alerts, subscriber notes & personalize your experience.

Register Now

The 1,268-MW Byron-1 in Byron, Illinois, reduced output beginning at 2 am CDT (0700 GMT) Friday "in coordination with PJM due to pricing signals and transmission line constraints," Exelon spokesman Paul Dempsey said in an email. The unit was operating at 86% of capacity as of 7 am CDT (1200 GMT), Dempsey said. He did not say when Byron-1 is expected to return to full-power operation.

The adjacent 1,241-MW Byron-2 was operating at 100% early Friday morning, the US Nuclear Regulatory Commission said in its daily reactor status report.

Output was reduced at the 912-MW Quad Cities-1 in Cordova, Illinois, beginning at 10:33 pm CDT Thursday (0333 GMT Friday), and at the 994-MW Quad Cities-2 beginning at 10:30 pm CDT Thursday (0330 GMT Friday), "in coordination with PJM due to pricing signals and transmission line constraints," Exelon spokeswoman Brandy Donaldson said in an email.



Quad Cities-1 was operating at 87% capacity, and Quad Cities-2 at 98% of capacity early Friday morning, down from 100% at both units early Thursday, according to NRC's daily report.

Both Quad Cities units were operating at 100% as of noon CDT (1700 GMT) Friday, Donaldson said.

The 1,320-MW Braidwood-1 in Braceville, Illinois, was operating at 92% early Friday, down from 100% Thursday, according to NRC's report. An Exelon spokesman did not immediately reply to questions on the status of that unit and the reason for the output reduction.

Since 2015, Exelon has temporarily reduced off-peak output at one or more of its nuclear plants in Illinois numerous times because of low power prices in PJM and/or grid constraints. The company has previously said intermittent grid congestion and periods of negative prices have been occurring in the region around those plants because of transmission line outages for scheduled maintenance, large influxes of wind-generated power into the grid during off-peak hours, or a combination of those factors.

--Steven Dolley, steven.dolley@spglobal.com

--Edited by Valarie Jackson, newsdesk@spglobal.com