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£700m plan with ‘fish disco’ could save 90% of marine life, says Hinkley Point C study

Scientists find underwater acoustic project to stop fish being sucked into cooling systems could save 44 tonnes a year

Jillian Ambrose , Guardian, 10 Feb 26

Scientists have found that plans that include a “fish disco” to deter migratory marine life from the nearby Hinkley Point C nuclear reactor could help save 90% of fish from the power plant’s water intake pipes – but the measures are set to cost its developer £700m.

EDF Energy, which is building the Hinkley Point C nuclear plant in Somerset, said research it commissioned from scientists at Swansea University had found that using an acoustic deterrent system helped to ward off the “vast majority” of fish it tagged for the experiment.

The part of the costly system that is informally referred to as a “fish disco”, is designed to use more than 300 underwater speakers to emit sound pulses to repel fish from the water intake pipes, which will suck in water from the River Severn to help cool Hinkley’s reactors.

EDF said it expected to spend about £700m on the full solution, or 1.5% of the total cost of building the £46bn project, which would give Britain’s first new nuclear power plant in a generation “more fish protection than any other power station in the world”.

This should help to save about 44 tonnes of fish a year – equivalent to the annual catch of a small fishing vessel. The company declined to speculate on the total cost per fish saved over the 25-year life of the reactor’s subsidy contract.

EDF has argued against the requirement to fit an acoustic deterrent in the past, instead suggesting that it could construct salt marshes to help protect marine life.

Under EDF’s subsidy contract it will earn a set return for the electricity generated by Hinkley, meaning it will need to absorb the extra cost of the fish disco rather than add it on to household bills.

The full system is expected to include special mouths fitted to the intake pipes to slow the water suction and allow fish to escape from as close as 2 metres away, and a fish recovery system which returns fish sucked into the pipes.

The scientists found that only one of its tagged twaite shad fish came within 30 metres of the test intake pipes when the speakers were turned on, compared with the 14 seen in the same area without the system turned on………………………………………….

The results of the research will be submitted for regulatory consideration and approval by the Marine Management Organisation later this year. https://www.theguardian.com/uk-news/2026/feb/10/hinkley-point-c-plan-could-save-fish-being-sucked-into-pipes-study-finds

February 14, 2026 - Posted by Christina Macpherson | environment, UK