Could a 'fish disco' be the revolutionary solution to protect marine life from nuclear power plants?
It sounds like something out of a quirky nature documentary, but scientists are exploring an innovative approach called a "fish disco" to safeguard fish from being drawn into the water intake pipes of the Hinkley Point C nuclear reactor. Astonishingly, preliminary studies suggest this unique system could help save an incredible 90% of fish that would otherwise be at risk! But here's where it gets controversial: this cutting-edge solution comes with a hefty price tag of £700 million.
EDF Energy, the company behind the Hinkley Point C project in Somerset, commissioned research from scientists at Swansea University. Their findings indicate that an acoustic deterrent system, affectionately nicknamed the "fish disco," has proven highly effective in repelling tagged fish. The system employs over 300 underwater speakers to emit sound pulses, creating an auditory barrier that steers fish away from the pipes. These pipes are essential for drawing water from the River Severn to cool the reactors.
While the £700 million investment represents about 1.5% of the total £46 billion construction cost, EDF highlights that this would provide Hinkley Point C with more fish protection than any other power station globally. This initiative is projected to save approximately 44 tonnes of fish annually, a quantity comparable to the yearly catch of a modest fishing vessel. The company has chosen not to speculate on the cost per fish saved over the reactor's 25-year subsidy contract.
Interestingly, EDF had previously voiced reservations about fitting an acoustic deterrent, suggesting alternative solutions like constructing salt marshes to protect marine life. However, under its subsidy contract, EDF will absorb the cost of the "fish disco" rather than passing it on to household energy bills. This means the energy bill payers won't directly shoulder the expense of this marine protection measure.
And this is the part most people miss: the system isn't just about sound. It also incorporates specially designed intake pipe mouths that slow down water suction, giving fish a chance to escape from as close as 2 meters away. Additionally, a fish recovery system is in place to return any fish that do get drawn into the pipes.
The research yielded particularly encouraging results for certain species. For instance, only one of the tagged twaite shad fish ventured within 30 meters of the protected intake pipes when the speakers were active, a stark contrast to the 14 observed in the same area without the system. For salmon, the news is also positive, as most migrating to the Atlantic tend to use the main channel of the Severn, which is safely distant from the Hinkley Point C intakes. In a two-year study, only two tagged salmon were detected within 1 kilometer of the intakes.
Dr. David Clarke, a fisheries scientist and marine ecologist at Swansea University, expressed optimism, stating, "These early results are very encouraging with the system clearly working." He elaborated that the system effectively deters a large majority of tagged shad from an area extending about 60 meters from the intake heads.
Chris Fayers, Head of Environment at Hinkley Point C, added, "Because the system works even better than we had hoped, it means we can meet all of our planning obligations and should not need to create 900 acres of salt marsh as environmental compensation." He also emphasized the broader benefit, noting it's "good news for a power station that will generate the reliable, low carbon electricity that the country needs."
These findings are now slated for submission to the Marine Management Organisation for regulatory consideration and approval later this year.
What do you think? Is the 'fish disco' a justifiable expense for environmental protection, or is the cost too high? Share your thoughts in the comments below!
