Breaking the world’s reliance on fossil fuels requires more than generating renewable electricity. Safe, economically viable storage will be needed for the dark, still days when solar and wind farms do not operate.
Many companies are working on long-duration storage technologies but crucially they must work at grid scale. Thermal energy storage using “hot rocks” is an attractive option, with the added potential to harness heat from industrial processes that is otherwise wasted. Rival tech includes pumped hydro, compressed air, gravity and other battery types. Costs and efficiency will decide which ones win out.
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