Revitalized Pumped-Storage Hydropower Plant is a Renewable Energy Game-Changer in the Philippines - CleanTechnica

The Caliraya-Botocan-Kalayaan (CBK) Hydroelectric Power Plant in the Philippines, nearly a century old, has been revitalized through privatization by the Thunder Consortium—a partnership of Aboitiz Renewables, Sumitomo Corporation, and Japan’s J-Power—following the third Green Energy Auction. Hydropower remains a dominant renewable energy source in the Philippines, supplying 13% of the country’s electricity, which surpasses the combined 9–10% from solar and wind. Importantly, pumped-storage hydropower like CBK offers significant energy storage advantages over current battery technologies, enabling the storage of surplus energy during low-demand periods and rapid generation during peak demand, thus complementing intermittent renewable sources such as solar and wind. The CBK complex’s origins date back to 1937 when American military engineer Lieutenant Colonel Hugh J. Casey initiated its construction with the vision of using high-head hydroelectric design to flood the Cavinti Valley and generate