Well, maybe not rocks in a mineshaft. Probably not rocks in a mineshaft. But Advanced Rail Energy Storage?[0] Different story, has potential (bad pun, I know).

Well, maybe not rocks in a mineshaft. Probably not rocks in a mineshaft. But Advanced Rail Energy Storage?[0] Different story, has potential (bad pun, I know). There are some nice synergies, like a system such as this can reuse the generators from a decommissioned coal or natural gas plant. It can definitely play a part in a broad-spectrum energy policy. [0]: https://aresnorthamerica.com https://aresnorthamerica.com