Estimates suggest abandoned mine shafts could store enough electricity to power the planet

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.

    • sugar_in_your_tea
      1·
      10 months ago

      It’s also correctly called:

      • hash
      • pound sign
      • number sign

      But cool people use the bespoke octothorpe.

      The first appearance of “octothorp” in a US patent is in a 1973 filing. This patent also refers to the six-pointed asterisk (✻) used on telephone buttons as a “sextile”.