An abandoned mine in Finland is set to be transformed into a giant battery to store renewable energy during periods of excess production.
The Pyhäsalmi Mine, roughly 450 kilometres north of Helsinki, is Europe’s deepest zinc and copper mine and holds the potential to store up to 2 MW of energy within its 1,400-metre-deep shafts.
The disused mine will be fitted with a gravity battery, which uses excess energy from renewable sources like solar and wind in order to lift a heavy weight. During periods of low production, the weight is released and used to power a turbine as it drops.
They have done this before, only instead of using a big weight, they use water. Lookup “Dinorwig Power Station” for a good example.
That’s similar but different in a lot of meaningful ways. Hydro pumping like that requires a relatively large body of water next to a large geographical height right nearby. This new system doesn’t require any water, and it uses a man made hole in the ground that’s already been created and which otherwise would be simply unused
It’s what we call a double whammy. Paid to remove the metals and then paid for the hole you’ve made.
I read of another it was the same physics but different scenario. I think it was like excess energy moves heavy carts up a hill. When energy is needed, these carts get released and their potential energy from hill and the basic idea of regenerative breaking to repurpose it’s kinetic energy.