It is smart to heat district heating water when electricity is cheap and store it until customers need the heat.
That is the philosophy behind two large so-called thermoses, which are now being built at Måbjergværket, which supplies district heating to consumers in Holstebro and Struer municipalities.
Two 30-meter-high tanks, each with space for 10,000 cubic meters of water, are being built as a supplement to the current tank, which has space for 5,000 cubic meters. This will give the plant the opportunity to store five times as much water in the tanks, which function as thermoses and thus retain heat.
- With the two new accumulation tanks, we will really be able to generate some heat when electricity is cheap. In this way, the heat will also be cheaper than it would otherwise have been, and more sustainable, because the electricity we use to produce the heat is primarily green electricity, says Aksel Heltoft, project manager at Vestforsyning, which owns the plant together with Struer Energi.
Cheaper than batteries
These kinds of tanks are currently popping up all over the country, says industry director at Dansk Fjernvarme Kim Morten to DR. There will be more accumulation tanks, but also large pond heat storages to store the energy, he says.
- This storage issue will be one of the biggest challenges for the energy sector. And it is just a hundred times cheaper to store the energy in water than in batteries, for example, he says.
Only a little over ten percent of Danish district heating is currently produced with electricity, but Kim Mortensen expects that figure to increase sharply in the future to 50-60 percent. This will help to use the green, climate-friendly electricity produced by, among other things, wind turbines and solar cells.
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