A funny thing happened back in the middle 1800s. A man ran a 7-ton electric locomotive a mile and a half. The motor was powered by a storage device. In the late 1800s, people drove their cars around all day using a storage device. These storage devices became better and better, until they could power trucks and buses for hundreds of miles.

They are still getting better and better. Of course they can be depleted, and it's good to havea backup methods to cover these cases and to keep the storage devices charged when there's no sun or wind. Hydroelectric dams powered by water-storage are widely-used, and some flat places still burn fossil fuels to do that as well.