Hamburg Considers Large Scale Storage of Heat
The key challenge with setting up a 100% renewable energy base is providing storage facilities. This applies to intermittent supply of electricity via wind and PV-solar, that needs to be matched with equally intermittent demand. The same consideration applies to space heating, the demand of which currently is mostly covered via fossil fuel. If you want to phase out fossil fuel for space heating, you will need to get serious about seasonal storage of heat: trapping solar heat in the summer, use it to heat large bodies of soil and withdraw these Joules in the Winter.
The city of Hamburg is considering a large scale heat storage that should cover 25% of Hamburgs needs. For the moment the buffer would be charged with industrial waste heat from fossil sources. But once realized the storage bugger could be fed with thermal solar as well.
Estimated cost: 4 cent/kwh, half of the price customers currently pay for district heating.
[energypost.eu] – Hamburg considers innovative heat storage scheme