> Heck you could build some large bodies of water and boil them from time to time. Some suppliers already do that. When a power plant also supplies the city he

> Heck you could build some large bodies of water and boil them from time to time. Some suppliers already do that. When a power plant also supplies the city heating, it makes sense for them to put the power surplus into pre-heated water which they can store and later distribute to the buyers of the heat. Obviously this needs some huge and well insulated tanks. Here's an article (in Polish) about one built in Warsaw, 10TJ capacity: https://globenergia.pl/najwiekszy-wodny-magazyn-ciepla-w-europie-powstaje-w-warszawie/ https://globenergia.pl/najwiekszy-wodny-magazyn-ciepla-w-eur...