In order to deliver enough electricity most of the time, without needing huge amounts of storage (which are tiny right now), renewables will have to be massively over built. I assume there'll be times when there's 5x or more the electricity available compared to actual consumption.
Let the sun shine and the wind blow in summer and there'll be huge amounts of electricity which cannot be stored or consumed by BEV or some other grid connected battery because they're not enough. Industrial processes won't easily consume sudden surges in available electricity either.
Take the UK grid with its average of ~ 31 GW. Let's say they triple their wind power capacity which is currently at ~ 18 GW and double their pv capacity which is currently at ~ 3 GW. That'd be 60 GW so roughly twice the electricity that's consumed on average.
We're in summer, heat pumps don't consume .. so 30 GW excess electricity over say 3 windy days adds up to ~ 2 TWh. That's the capacity of 26.7 million Tesla Model 3 (long range) with a 75 kWh battery each. And they'd all need to be charged from 0 to 100 %.
Batteries won't suffice, I think.
So what'll be done? Electrolysis, I think -> H2, ammonia, methane, ..
So there'll be significant amounts of these being produced and stored.
Ammonia might well become the energy carrier of the future, being shipped around the world with large tankers to transport energy from where it's produced to places where it's used.
If that were to become true, wouldn't the fuel cell be the fitting technology for heavy duty and/or long range vehicles?
And once there'd be infrastructure for trucks and heavy vehicles, roughly the same ifrastructure could be used for FCEV cars.