"Breakthrough Energy Ventures, the Bill Gates–backed fund, has made long-duration storage one of its highest priorities. In addition to Form, it has backed Quidnet and Malta, another thermal startup that relies on molten salt as the storage medium (see “Alphabet is in talks to spin out its molten-salt storage play”).
Meanwhile, Japanese conglomerate SoftBank recently invested $110 million in the Swiss mechanical storage startup Energy Vault, which uses cranes and wires to stack up concrete blocks when renewables are generating excess electricity. It then drops those blocks back to the ground on those same wires, using their momentum to turn motors in the cranes in reverse and pump out electricity."
This vid provides another perspective
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