Ultimately, it doesn't matter how cheap solar gets unless we can store that energy, and storage on this scale has never been achieved before. Grid-le… - Peter Diamandis

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Ultimately, it doesn't matter how cheap solar gets unless we can store that energy, and storage on this scale has never been achieved before. Grid-level storage requires colossal batteries. Today's lithium-ion batteries are woefully inadequate. Their storage capacity would need to be improved ten- to twentyfold, and — if we really want them to be scalable — they have to be built from Earth-abundant elements.