this post was submitted on 13 Aug 2024
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Sweden has a lot of district heating already. Storing heat in form of hot water is rather easy and cheap. Large water tanks have lower outside volume and insulation is rather cheap. So one can produce heat in summer and use it in winter.
Well, Yes and no. Water is a great storage, but it is hard to insulate and very corrosive in the long run. And on the grand scale of things, the amount of water that needs to be heated for city scale applications are hard to deal with. There are cities which has connected huge caves to the district heating system, but the amount of energy stored there is rather insufficient. A case in point, Mälarenergi claims that their energy store, the size of about 120 Olympic swimming pools heated to 95 degrees C, would power a city of about 100 000 people for about two weeks in somewhat benign weather conditions.
Winter is longer, though, and we need to find ways of storing more heat for longer to be able to make a real dent in demand. There are other methods though, and even better is that some of them doesn't need any carbon what so ever to be viable. And with the new EU directives (EED and EPBD) the foundations and Incentives has been given to start the race for better (district) heating solutions.
https://en.wikipedia.org/wiki/Aquifer_thermal_energy_storage
Absolutely! And tests are being performed on how to actually make something that is low carbon and practically useful, like in Fjell, in Drammen in Norway. Unfortunately it's not as easy as finding an aquifer and heat it to boiling point. Here is a link to the Fjell test: https://www.muovitech.com/SE/?page=news&id=649