Backed Malta Inc — molten-salt thermal storage to capture excess solar and wind electricity

Breakthrough Energy Ventures led the investment in Malta Inc, a Boston-based startup spun out of Alphabet's X lab that uses a molten-salt and antifreeze thermal storage system to store excess electricity from solar panels and wind turbines as heat and cold, then discharge it back as electricity on demand. The system heats salt to 565°C and cools an antifreeze solution to -70°C in insulated tanks — functioning like a giant rechargeable thermal battery. Malta's approach is designed for utility-scale grid storage at costs far lower than lithium-ion batteries, enabling solar and wind to power the grid around the clock.
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March 2025
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Breakthrough Energy Ventures backed Savor, a startup that produces butter using carbon dioxide and hydrogen — derived from atmospheric carbon and water — without any conventional agriculture, animals, or farmland. Savor's thermochemical process generates saturated fat with an identical molecular profile to dairy butter while using an estimated 99.9 percent less water and zero agricultural land. The product launched at Michelin-starred restaurants in 2025, with supermarket availability targeted for 2027, as part of Gates's broader bet on food-system decarbonisation.
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