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A comment on Gigantic heat caverns in Mustikkamaa have now been filled with water (2021). Parent comment

Re:Gigantic heat caverns in Mustikkamaa have now been filled... by Hamuko on Friday November 10, 2023 @11:55AM (#38221201)
There is a heat exchanger.

https://www.slideshare.net/HelsinginEnergia/innovation-and-s... (slide 21)

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