Have you heard of Energy Vaults before? Appears, first one being constructed in China right now: https://www.forbes.com/sites/erikkobayashisolomon/2023/12/20/energy-vault-wins-big-with-gravity-storage-in-china/?sh=10ba743f6c69
Very interesting. Reading up on https://en.wikipedia.org/wiki/Energy_Vault and general class https://en.wikipedia.org/wiki/Gravity_battery
I forgot how to link nostr:note1pjtet7msn88jl46uwxdyjcreey2ujz8ufz357ksch52k7mq9pgqqf8qkyf