Sources: Sperra, San Pedro, Calif.; CP staff Sperra, developer of a subsea pumped storage hydropower (SPSH) concept based on 3D-printed concrete spheres, has secured a $4 million U.S. Department of Energy (DOE) Water Power Technologies Office grant to demonstrate a 10-meter diameter, 500kWh/600kWh unit off the southern California coast. Formerly known as RCAM Technologies, the company proposes hollow vessels placed…
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