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Rare good news: we can now store excess solar power to heat homes in giant batteries made of crushed soapstone sand: https://timesofindia.indiatimes.com/science/a-finnish-town-now-heats-itself-through-winter-using-a-giant-battery-made-of-2000-tonnes-of-sand-charged-by-cheap-electricity-and-holding-the-warmth-for-months/amp_articleshow/132531824.cms