renewable energy magazine
Summary
A seasonal thermal energy storage will be built by Vantaa Energy in Vantaa, which is Finland's fourth largest city neighboring the capital of Helsinki. When completed, the seasonal energy storage facility will be the largest in the world by all standards. The operating principle of the seasonal thermal energy storage, called Varanto, is to store heat in underground caverns so that it can be used to heat buildings via the district heating network whenever it is needed.
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