Mainly windmills at night. And then there is hydropower from norway aswell at night. Both are "uncontrolled" and thereby having large excess capacities at night and with windmills also when its very windy.
Its calculated that 700 windmills can keep the entire danish carpark running on electricity. Even making gas into electricity is a large plant would be more efficient that out in the car
But again, we also burn biofuel for CO2 neutrality. So its a win/win.
Bookmarks