this post was submitted on 09 May 2025
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Renewable energy companies eyeing off abandoned mines in Queensland (www.abc.net.au)
submitted 1 month ago by kalkulat@lemmy.world to c/climate@slrpnk.net
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Green Gravity's renewable-powered technology stores energy by lifting heavy objects up a mineshaft.... It calculates it can store two gigawatt-hours of energy from the sites surrounding Mount Isa.

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[–] Successful_Try543@feddit.org 1 points 1 month ago* (last edited 1 month ago) (1 children)

I also think their numbers are too optimistic. You probably could store about 2 GWh energy if you equip all of the supposedly 100,000 mine shafts in Australia with their storages. Yet, this would not only mean 100,000 facilities to be constructed, but also mean 100,000 facilities to be checked and maintained regularly.

If I understand them correctly, they intend to use heavy materials from scrap for the weights, e.g. some steel container filled with concrete rubble. Thus, the price of them will be relatively low.

[–] SomeoneSomewhere@lemmy.nz 2 points 1 month ago (1 children)

I would hazard a guess that a 40t-rated winch, 40t-rated 100m wire rope, and 40t-rated steel bucket to hold the scrap each cost more than a 10kWh battery.

[–] Successful_Try543@feddit.org 1 points 1 month ago* (last edited 1 month ago) (1 children)

Don't forget the generator/engine.
I didn't claim it was cost or ressource efficient in any way.

[–] SomeoneSomewhere@lemmy.nz 2 points 1 month ago

That would likely be the winch, but yes, you'll need a nice large regenerating motor drive.