Wind and solar are extremely unstable. Spain had a country-wide blackout earlier this year because of reactors being off. Days with peak solar and wind (heavily subsidized) made nuclear not viable. But you need a stable source to keep the grid from collapsing (and not fry appliances), like nuclear or hydro. It's like both a pace-maker and a goakeeper.

So you need a mix. Small reactors fix the problem of NIMBY caused by decades of fearmongering (now slowly reversing).