When they say "extra" they mean extra generation, not new capacity. The grid isn't running flat out all the time. The highest output this year was 48GW. At nigh

When they say "extra" they mean extra generation, not new capacity. The grid isn't running flat out all the time. The highest output this year was 48GW. At night, it does about 22GW. That leaves plenty spare capacity for charging cars if required.