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Rooftop solar eats up all demand in South Australia, world’s most renewable grid
(reneweconomy.com.au)
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Since Kbin doesn't show Lemmy Moderators, I'll list them here. Also note that Kbin does not distinguish moderator comments.
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The genius part of that IMO is storing energy as cold, not just as heat.
You need a heat difference to run a heat engine, and the energy lost refrigerating the cold block is more than made up for by making the "waste heat" into usable energy.