Wind tends to be higher at night (at least here in Texas), so solar and wind are good complements. The biggest issue here is in the summer right after the sun sets, but that just means having enough battery storage for a couple hours for temps to start dropping. But wind/solar are still cheaper after including storage for that amount of time by far compared to new nuclear or new fossil fuels. Only existing facilities have a comparable per kWh cost when compared to new solar/wind + storage. Even if you quadrupled the storage, it would still be cheaper than new nuclear and comparable to existing nuclear iirc. Granted cost of storage partly depends on what storage options are viable locally for small grids.