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by automatic6131 1316 days ago
But missing the crucial second half, releases electricity on discharge.
2 comments
tuatoru 1316 days ago
It's an accumulator for a district heating system, which are apparently common in Nordic countries.

Traditionally district heating systems use waste heat from thermal generation of electricity, which heat is free.

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tomrod 1316 days ago
It's not a chemical battery, which releases energy as electricity, but electricity can certainly be generated using heat stored in heated/molten sand.

Ultimately its about energy transfer, efficiency, and storage.

link