If only there was a power source that would excel during sunny and warm days, huh

Then we could stop the nuclear plants when needed for cooling and maintenance

Hungary actually has a ton of solar, video from today: https://www.youtube.com/watch?v=HqpTN5PZLow

The problem is we don't have enough storage to use it after dark.

> we could stop the nuclear plants when needed for cooling

Well that's exactly what they did thanks to solar power provided by the rest of the grid, so your snark seems rather unwarranted.