Let's imagine by 2035 that say 75% of sales of NEW cars and light trucks are fully EVs, that could be a rough estimate. The percentage of EVs on the road would be say 40%, and growing. I've read various estimates, but we'd need about 15-20% more electrical power to the grid, at night anyway. At night.
That's doable, normally, but our overall demand for electric power is growing as well, along with GDP basically, or close to that. So you'd need more wind power, much more, just to stay even, not able to shutter coal and NG production plants. You can scribble the math on a napkin and it isn't good.