Yle
Summary
Beneath Helsinki's iconic Esplanade lies an enormous underground water reservoir — so large it's been jokingly nicknamed a lake.
The space, accessible via a long tunnel from the Punavuori district, opens into a vast subterranean cavern below Kaartinkaupunki. Here, energy company Helen operates one of the city's underground heat pump plants, which provides both district heating and cooling to residents.
At the heart of the cooling system is a massive, 25-million-litre cold water reservoir used to store energy.
"In Helsinki, we're able to make use of district cooling, district heating, and electricity production — nothing goes to waste," said Helen production manager Timo Marttinen.
"There's a good understanding of energy efficiency in Finland."
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