That’s hogwash, swapping 100% of new cars to EV’s represents roughly a 1% increase in electricity demand per year. We can quibble about how flexible the grid is, but historically demand has increased much faster than that in several periods.

As a sanity check. Cars last ~25 years on average. So 100% new EV’s represent roughly a 4% changeover per year. Average load per EV works out to roughly 450 watts, because they use a lot of power when their on but most people aren’t driving that long per day.

Actual use depends on various factors like charging efficiency etc but roughly 15,000 miles at 4 kWh / mile is only 3,750 kWh per year + charging inefficiency call it 4,000 kWh [per EV] * 282 million [cars] * 0.04 [% new cars per year] = 45 TWh per year vs ~4,000 TWh of total US electricity demand. (Edit: fixed units.)

By comparison demand increased by roughly 100TWh/year from 1985 to 1990. Demand only really leveled out between 2010 and now. https://www.statista.com/statistics/201794/us-electricity-co...