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Alt Carbon said the agreement followed more than a year of scientific review and due diligence, with Microsoft requiring additional verification and data-sharing measures.
SpaceX alumni Andrew Redd is betting the ocean has vast amounts of untapped geothermal energy.
Fusion power startup Avalanche Energy said its reactor prototype heated a plasma to over 10 million degrees Celsius.
Ambrosia Energy wants to build power plants in less than 12 months while undercutting natural gas. It hopes to build gigawatts' worth by 2030.
GM is developing an entirely new sodium-ion battery chemistry for use in everything from data centers to its own factories.