First, we don't even have the resources to provide electric power at decent prices as things are right now, that's why your nice 70-year lady living with her 2 cats in a house in Cornwall or something like that will see her power invoice multiply by a factor of 3 or 4 at least, thinking that bringing in even more demand for power will improve things when it comes to price is, I repeat, criminal (that old lady presumably needs power in order to heat herself during the winter, making that power exponentially more expensive won't help with that).
Second, we don't have the infrastructure. Maybe if we'll invest trillions of dollars and euros we'll be able to connect the new nuclear plants and solar farms to the main grid and transport the new extra power between big population centers, but at the "last mile" stage things are awful, for example I'm 99% sure my apartments building cannot handle one in two apartments (let's say) charging their cars at night, especially during the summer, the thing will just catch fire.