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One nuclear reactor being turned back on is generating four times more electricity than New York's utility-scale solar fleet in 24 hours.

 

Look at the dark band at the bottom of the chart. That's New York's nuclear fleet, and on Monday it was noticeably taller than it's been all fall.

 

 

The reason is FitzPatrick. Constellation's 853 MW reactor on Lake Ontario, near Oswego, finished a three-week refueling outage on October 3. While it was down, New York's nuclear fleet averaged about 2,450 MW. On Monday it ran at 3,290 MW, flat around the clock, at 3 AM, at noon and at 7 PM.

 

That one reactor added about 20 GWh to the grid in a single day: More than all of New York's wind combined (15 GWh). Nearly four times the state's utility-scale solar (5 GWh). About half of all solar statewide, rooftops included (41 GWh). With FitzPatrick back, nuclear supplied 21% of the state's power on Monday, up from roughly 16% during the outage.

 

FitzPatrick is one plant on a few hundred acres, and it was almost shut down in 2016. Its output doesn't depend on the weather or the time of day. When it goes offline for refueling, every other source on the chart has to make up the difference.

 

Last edited12:06 PM · Oct 7, 2026

 

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