Storing sunshine in salt or sandSourced
The sun sets, but stored heat remains.
Molten salt and sand can hold it.
Concentrated solar power first turns sunlight into heat. That heat can be stored in molten salts or a solid medium such as sand, then used when sunshine is scarce. The material stores thermal energy rather than electricity itself.
Hot material extends
the useful solar day.
Summary / translation: Unbubly · CC BY-SA 4.0
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Grid energy storage · Wikimedia contributors
Adapted, summarized and translated from the source. Adapted text is also available under CC BY-SA 4.0.
Reviewed: 2026-10-01