Emerging Technologies · By Brian Fulcher
Prototype or demonstration. Researchers tested flexible blades on a model tidal turbine in a water tank.
Last reviewed November 13, 2026.
If a tidal turbine needs a repair, the machinery is underwater and the current keeps moving. That makes the parts that protect a turbine from rough water important in their own right. A team at the University of Edinburgh and Michelin tested whether a blade could take on some of that job by bending on its own.
What changed
The November 11, 2026 Nature paper reports tests on a 1.26-metre model turbine at Edinburgh’s FloWave research facility in Scotland. The university’s engineering report, dated November 12, says the flexible blades cut rapid load swings associated with fatigue by up to 29% under the study conditions. Fatigue is the damage that builds up when a part is repeatedly stressed. The authors also used measured performance to simulate a tidal cycle. In that simulation, the flexible design harvested about as much energy as a rigid-blade design with active pitch control.
Why the rear edge bends
Water flowing past a turbine blade produces the forces that turn the rotor. In active pitch control, equipment rotates a rigid blade to change how it meets the current. The experimental design has a stiff front support and a rubber trailing edge. When the load rises, the rear edge bends and the blade’s curved profile flattens. That lets the blade shed some of the extra force as the water changes. The simulated flexible-blade turbine still used rotor-speed control.
What it could change for operators
A blade that handles some of the load itself could let turbine designers simplify the underwater pitch mechanism. The benefit would depend on whether the flexible edge and its attachment can survive years of service and be inspected or replaced at reasonable cost. The study included full-scale simulations. Ocean service life, operating savings and access to a commercial turbine with these blades remain unverified. Michelin helped fund the work, contributed researchers and has filed a patent, according to Edinburgh.
Root Access Take
I’d compare the maintenance tasks side by side. What does a technician have to inspect, what can be replaced underwater, and which failures require bringing the rotor to the surface? Fewer moving parts could help. The time and equipment needed to repair the flexible edge would still count.
For another example of how a materials result fits into a larger energy system, see the perovskite solar-cell explainer.
What to watch next
Look for a larger turbine tested in real tides across seasons. Useful measurements would include energy output, wear at the rubber-to-rigid joint, marine growth and service time. The university’s dataset record lists its files under embargo until January 14, 2028.
Primary sources
Zhang and colleagues’ Nature paper · University of Edinburgh’s engineering report · FloWave test facility description · University of Edinburgh dataset record.