How big can a fish be and still pass through the Restoration Hydro Turbine (RHT) safely? Pretty big! This passage test of 186 rainbow trout measuring up to 500 mm (~19.7 in) in length found no meaningful difference between the fish passed through a 1.9 m (~ 6.2 ft) diameter RHT and the control group, who were not passed through any turbine.
This fish passage test was conducted jointly by Natel Energy and Pacific Northwest National Laboratory (@PNNL) in the spring of 2022, at Natel's Monroe hydropower plant in Culver, Oregon.
For more info about Natel's fish passage testing and peer-reviewed papers, visit our fish passage page.
An AUMA electric actuation solution ensures high-precision guide vane adjustment for a fully-submersible hydro turbine from Natel Energy at the Sauerbrunn hydropower plant.
Natel Energy is featured in the Water Power Technology Office 2021-2022 Accomplishments Report for three different projects! Read more on pages 13, 16, and 17.
Our 2021 study with PNNL found 100% survival rates for American eel passing through the RHT, and the peer-reviewed paper is now available from Transactions of the American Fisheries Society.