This startup wants to build pumped hydro storage in the ocean

Published on November 10, 2025

The ocean has beckoned to legions of energy entrepreneurs before dashing their hopes against the rocks. Now a new company is heeding the siren call — but with a twist. Italy’s Sizable Energy launched in 2022 to build pumped hydro energy storage under the ocean. Cofounder and CEO Manuele Aufiero pursues that…

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