Once built nuclear plants are basically giant nuclear batteries which we can run up or down on demand which is easier and probably more efficient than storing a huge excess of renewable surplus at creation.
Nuclear power stations have very slow demand response. That used to be done by gas peakers and hydro; in a decarbonised world that changes to battery peakers and hydro.
Once built nuclear plants are basically giant nuclear batteries which we can run up or down on demand which is easier and probably more efficient than storing a huge excess of renewable surplus at creation.