If you add in batteries with todays technology the nuclear plants are competituve with solar or wind.

So the alternative is coal or natural gas plants. Which then have their own drawbacks.

Solutions that are built today need to use technology available today.

Nuclear is fine, especially when you are not buying the first reactor of its kind from a vendor who has never fully built a plant on its own. Areva got a tad too greedy and cut out the middleman in the form of doing 100% of the work themselves instead of the usual 30% and contracting out the rest. They ware not helped by the fameously strict Finnish regulatory authority (STUK).

Add that in and the equation looks substantially different.

https://global.kawasaki.com/news_211209-2e.pdf