In September 2021, Natel conducted formal testing with PNNL on a cohort of American eel passing through the RHT test unit operating at 670 rpm under 10 m of hydraulic head. Following the test the eels were monitored for 48 hours with 100% survival.
In 2019 Tony Grassi, owner of The Mill at Freedom Falls, partnered with Natel to install the first Restoration Hydro Turbine.