Good points. Denmark has a lot HVAC district heating with storage for load balancing planned in it's energy strategy 2050 (as I remember when I read it few years back).

Example of a proof of concept for electricity to heat and reverse via rock heating is the Siemens Gamesas Hamburg plant: https://www.siemensgamesa.com/explore/innovations/energy-sto...

Additionally, I would add that there electricity for generation of hydrogen or synth fuels for airline or seafaring industries:

https://www.offshorewind.biz/2021/05/17/construction-starts-...

https://fuelcellsworks.com/news/major-green-hydrogen-facilit...