"Cache Energy is the latest startup to attempt the feat, and it's taking a slightly different tack than most. Rather than store power as heat using sand or specially made bricks, Cache is storing it in chemical bonds inside pellets made of lime derived from limestone."
"It's a low cost solid that is able to produce heat and can use some of the similar infrastructure built around fossil fuel," he told TechCrunch.
"As long as you physically contain it - it could literally be a tarp - that is enough to hold its charge almost forever."
"The startup begins with calcium hydroxide, a widely available material that's used in everything from paper making and sewage treatment to pickling and nixtamalization, the process that turns cornmeal into masa for tortillas."
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