Nuclear power advocates are increasingly emphasizing the value of existing but financially struggling U.S. nuclear plants in curbing carbon emissions and addressing climate change.

Questions about nuclear power's costs and safety that kept it at 18% to 20.6% of U.S. electricity generation from 1990 to 2020 left little support for new plants. But extreme weather-driven disasters and predictions of much worse in the recent reports from the Intergovernmental Panel on Climate Change and National Oceanic and Atmospheric Administrationare driving new thinking about existing plants. 

"The economic feasibility of existing nuclear is a very different question depending on whether the power market values clean energy," said Exelon Senior Vice President of Regulatory Policy and Analysis Mason Emnett. In a power market that compensates all clean resources, "our nuclear units could compete, operate safely and reliably, and be relicensed."