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-m

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-samhalle/vara-anlaggningar/energilager/ https://www.malarenergi.se/om-malarenergi/framtidens-samhall... [2] https://www.svt.se/nyheter/lokalt/ost/de-lagrar-varme-i-berggrunden-ska-anvandas-i-vinter https://www.svt.se/nyheter/lokalt/ost/de-lagrar-varme-i-berg...