[M. Dodge Thomas]

One of a number of recent investments in "low tech" energy storage systems by companies in energy-intensive industries such as smelting.

Given the current media focus on WSB (wind, solar battery) generation and storage, it's easy to overlook the recent surge of investment in lower-tech "kinetic" storage systems, several of which are moving from "concept" to "implementation".

More on Energy Vault:

https://spectrum.ieee.org/gravity-energy-storage-will-show-its-potential-in-2021

[Chad C. Mulligan]

Hydro power (i.e. dams) is the only “gravity” system worth exploiting.

But nooooo....dams kill the little fishies.

[x]

It would be really scary if our planet ran out of gravity.

[dfwgator]

Zinc?