Spain already started tweaking the night price discount on electricity in 2007. There were complaints from people who had replaced their gas heating systems with electric heaters and were going to lose much of the economic benefit of being able to charge accummulators at night.

When people start charging their cars massively at home, demand will equalize and so will price.

tens of millions of people stand to see their lives ruined because the bureaucrats at the ECB don't understand introductory economics -- Dean Baker

Depends. Pile a bunch of extra nighttime electricity demand into the french grid, and the cost per KWH will go down a bit, not up.

Yes, but the point is that the price advantage of picking low price days over low price hours is a small fraction of an already low cost, and the convenience cost is high. Or put simply : having a fully charged car each morning will cost you mere cents extra compared to picking the setting that tries to get you the very best deals possible on electricity. Just about everyone will elect to pay. Utilities will expect them to elect to pay, and invest accordingly.