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A small Finnish town is operating the world's largest commercial sand battery, a storage system that converts surplus electricity into heat held inside ordinary sand, then releases it when the grid runs short.
The technology targets intermittency, the structural mismatch between when wind and solar generate power and when people actually use it. That mismatch has become the defining obstacle in the global energy transition.
What a sand battery actually is Most people think of batteries as devices that store electricity. A sand battery stores heat instead.
Excess power from renewable sources heats sand inside large insulated silos to high temperatures. The sand holds that warmth for days.
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