Unlikely. The ISO has 3.5GW of solar and nuclear capacity equally (I’m aware of capacity factor of solar vs nuclear, but the ISO also reports ~6GW of behind the meter distributed solar which only manifests as reduced demand). The ISO needs more batteries, renewables, and transmission from hydro in Quebec, Canada (1.2GW), but nuclear is not needed to succeed long term and those two generators will eventually be decommissioned, as their license only extends their operating period to ~2050. Twenty five years is plenty of time to replace their 3.5GW of output; 18GW of battery storage, 17GW of wind, and 13.5GW of solar is in the ISO’s interconnect queue or has been proposed by developers.

https://www.mainepublic.org/climate/2025-01-03/central-maine... (“Central Maine Power aims to finish controversial western Maine power corridor in 2025”)

https://www.mainepublic.org/politics/2023-11-30/documents-re... (NextEra, which owns the Seabrook nuclear power plant in N.H., stands to lose tens of millions of dollars every year if the NECEC comes online and attempted to use political donations to scuttle the Quebec Hydro transmission line)

https://www.iberdrola.com/about-us/what-we-do/smart-grids/ne... (“The new transmission line between Quebec and Maine will provide 1,200 megawatts (MW) of renewable hydroelectric power to the New England power grid in Lewiston, Maine, sufficient to meet the demand of 1.2 million homes. Once built, NECEC will be New England's largest renewable energy source, saving customers $190 million per year.”)

https://www.iso-ne.com/about/government-industry-affairs/new...

https://www.canarymedia.com/articles/clean-energy/northeast-...

https://app.electricitymaps.com/map/zone/US-NE-ISNE/live/fif...

(Quebec, interestingly, has ~40GW of hydro generation capacity)