Natel Energy’s Linear Pelton hydroEngine, a linear free jet single stage impulse turbine, spins at the Natel Energy headquarters in Alameda, California.

Researchers tag wild run spring Chinook salmon with a passive integrated transponder (PIT), which will track migration through the Clackamas River Hydroelectric Project near Estacada, Oregon.

A researcher from the University of Washington prepares the RivRaft drifting hydrophone array, an underwater listening system used to monitor and mitigate potential interaction of marine energy technologies with fish. The RivRaft was deployed to monitor the Ocean Renewable Power Company’s RivGen hydrokinetic turbine in Igiugig, Alaksa.