Comment by cjg_

There's several projects ongoing to store heat from district heating systems, for example in Västerås [1] and Linköping [2]

[1] https://www.malarenergi.se/om-malarenergi/framtidens-samhall... [2] https://www.svt.se/nyheter/lokalt/ost/de-lagrar-varme-i-berg...