(cleantechnica.com)

190 points erwinmatijsen | 1 comments | 03 Sep 25 06:00 UTC | HN request time: 0.201s | source

1. Cthulhu_ ◴[03 Sep 25 08:03 UTC] No.45113344[source]▶

Related: in Sweden they filled a cave (an old mine?) with water and are using that as heat storage: https://www.youtube.com/watch?v=VSdKL0Nnk-k

Finnish City Inaugurates 1 MW/100 MWh Sand Battery