Another option is to get some high-capacity high-voltage DC lines connecting continents so that countries around the world can sell power during the day and buy it at night. We can keep the fossil fuel plants around as emergency backup.
At this point, though, we're a long way even from being able to shut off the fossil fuel plants during the day while the sun is shining.
Nearly all vehicles are parked for most of the day. We should incentivize workplace charging, to help with that.
But really, we must drastically reduce our need for driving. We simply can't scale EV production quickly enough to make the impacts we need to. If we want to reduce car emissions by half by 2030, we need to be at 100% EV sales very very soon, and we are no where close to it.
If all the major roads and highways are electrified for 100% of their distance (like we would have had to have done in order to switch to electric, say, back in the 70's during the oil crisis when lead acid was the best battery tech available), that would be far more expensive and probably not worth it.
Driving less, more workplace charging, more mass-transit, and electric rail are all good. It'd be great to see electric shipping too, but I'm not sure how to get there; you'd need multiple charging stations in the middle of major oceans or something.
The real power generation tech here will be wind and solar, not nuclear. We can build lots and lots and lots of it, easily and cheaply. And using it to charge vehicle batteries doesn't even require intermediate storage.
Even construction powerhouses like China are deploying more than an order of magnitude more renewables than nuclear, because renewables will be the backbone of any future grid. Nuclear isn't getting any cheaper, yet wind solar and batteries are on exponentially decreasing cost curves.
People on HN are far better able to understand exponential technology advancement than people in the energy industries. And hopefully we can all see how renewables plus batteries is going to make nuclear obsolete.