Once we’ve phased out fossil fuels, then nuclear will be important. But right now nuclear only serves to sustain our dependency on fossil fuels.
The two largest economies with the low reliance on fossil fuels for energy (Sweden & France) get significant portions of their energy production from nuclear power. Iceland relies on geothermal, and the others (Tajikistan, Switzerland, Costa Rica, Norway) have lots of hydro capacity, which are all excellent, but also largely dependent on geography.