Natel Energy
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How fish-safe hydropower technology could keep more renewables on the grid
Natel Energy is making new designs for the turbines that generate electricity in hydropower plants as water rushes through equipment and moves their blades. Conventional turbine blades can move as fast as 30 meters per second, or about 60 to 70 miles per hour, Schneider says. When straight, thin edges are moving that quickly and striking fish, “it’s fairly obvious why that’s not a good outcome,” she says.
Natel’s turbine design focuses on preventing fast-moving equipment from making fatal contact with fish. The blades have a thicker leading edge that pushes water out in front of it, creating a stagnation zone, or “basically an airbag for fish,” Schneider says. The blades are also curved, so even if fish are struck, they don’t take a direct hit. The company has tested its turbines with a range of species, including American eels, alewife, and rainbow trout. In the case of one recent study with American eels, scientists found that over 99% of eels survived after 48 hours of passing through Natel’s equipment.