Wave-powered underwater pole system completes final dry tests

Dutch company Symphony Wave Power has successfully completed dry testing of its innovative underwater wave energy converter, marking a significant milestone ahead of its planned 2026 deployment in the North Sea. The system is a fully submerged point absorber that harnesses wave-induced pressure variations to generate renewable electricity. Unlike traditional surface buoys, it operates invisibly beneath the sea surface, using a fixed seabed-anchored core and a vertically moving hull separated by a flexible liquid- and air-filled membrane. Wave motion forces liquid through a bidirectional turbine connected to a generator, producing clean, stable power that can feed directly into an underwater DC grid. The technology boasts up to 500% higher efficiency than conventional non-resonant designs by tuning its internal spring to resonate with wave frequencies, maximizing energy capture. It is designed to be simple, sustainable, and low-impact, with only two moving parts made from recyclable materials, and requires minimal installation effort and maintenance. Clusters of up to 60 units can generate as much as