Hinkley Point C Nuclear Plant to Test New Acoustic Fish Deterrent

The Hinkley Point C nuclear power plant in southwest England is set to test a new acoustic fish deterrent system, leading to a pause in plans to create over 800 acres of saltmarsh as compensation. Originally, the plant was approved with low-velocity cooling water intake heads and underwater speakers to deter fish.
However, EDF, the company behind the project, cited safety risks for divers as a reason to explore saltmarsh creation instead.
The new deterrent uses ceramic transducers to emit high-frequency sound, minimizing impact on marine mammals like dolphins and seals. Tests have begun, showing salmon moving away from intake heads. While tests continue through 2025, saltmarsh development is paused, though EDF may still pursue it if the deterrent is ineffective.
The Environment Agency estimates the plant's impact on fish at 44 tonnes annually, less than a small fishing vessel's catch. EDF will submit a material change application in 2026 for fuel storage and infrastructure changes.