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Finnish City Inaugurates 1 MW/100 MWh Sand Battery

(cleantechnica.com)
190 points erwinmatijsen | 1 comments | 03 Sep 25 06:00 UTC | HN request time: 0s | source
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Cthulhu_ ◴[03 Sep 25 08:02 UTC] No.45113336[source]▶
So why a surface sand silo instead of going down and using the soil/clay/bedrock/whatever is there? Ease of installation and maintenance?
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whimsicalism ◴[03 Sep 25 08:08 UTC] No.45113364[source]▶
presumably you need the insulation from the air, otherwise it would just sort of dissipate through the ground
replies(2): >>45113524 #>>45113779 #
1. Findecanor ◴[03 Sep 25 08:39 UTC] No.45113524[source]▶
I'm not a building engineer, but my impression is that it does not matter as much as we might think.

A housing complex near mine got a massive tank like this installed thirty years ago, and I think they put it underground to be able to build a house on top.