| ▲ | tecleandor 2 days ago | ||||||||||||||||
But how expensive would be to dig a, I don't know, 1000 by 6 feet hole in the ground? I have no idea of an equivalent gravity battery... | |||||||||||||||||
| ▲ | thfuran 2 days ago | parent [-] | ||||||||||||||||
The average US household uses about 10,000 kwhr per year. That's roughly equivalent to the gravitational energy of dropping ten tons down a 200 mile hole. | |||||||||||||||||
| |||||||||||||||||