'Sand battery' could solve green energy's big problem (bbc.co.uk) 14 points by QuarkForMrMark 4y ago ↗ HN
[–] synctext 4y ago ↗ Fascinating stuff. Some numbers from the startup website[1]:- < 10 eur/kWh of storage capacity (piping is now dominating cost)- The storage has 100 kW heating power and 8 MWh capacity.- three times superior to water-based storage and beyond boiling point [2]- related scientific work, using granite [3][1] https://polarnightenergy.fi/technology[2] https://www.youtube.com/watch?v=tm7spMG0ch8&t=871s[3] https://www.mdpi.com/1996-1073/13/21/5662/pdf
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[ 4.1 ms ] story [ 5.1 ms ] thread- < 10 eur/kWh of storage capacity (piping is now dominating cost)
- The storage has 100 kW heating power and 8 MWh capacity.
- three times superior to water-based storage and beyond boiling point [2]
- related scientific work, using granite [3]
[1] https://polarnightenergy.fi/technology
[2] https://www.youtube.com/watch?v=tm7spMG0ch8&t=871s
[3] https://www.mdpi.com/1996-1073/13/21/5662/pdf