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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 Filligree on Friday November 10, 2023 @12:23PM (#38221610)
Counterflow heat exchangers easily approach 100% efficiency. It needs to be large enough, and needs sensors to control the flow, but both of those are trivial at this scale.
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Re:Gigantic heat caverns in Mustikkamaa have now been filled... by lazide on Friday November 10, 2023 @02:46PM (#38223592)
They’ll need to move 2x the volume of water, and have more infrastructure to maintain - even if it was actually 100% thermally efficient. Not counting capital costs. Which I’d count as efficiency issues.

The water pumping and maintenance costs are likely going to be their largest ongoing costs, no?

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