Their math is a bit off though... 300MW is not enough for 3.1 million households. That's 97W per household for like 2 hours.

To my understanding the use of nuclear would be to reduce the ammount of spread out battery stations that'd have to cover the base load when cloudy / at night.

There'd also be less overbuilding of solar as you have to build for winter weather and day length instead of summer if solar is supposed to cover everything