rolling fluid turbine: energy via fluid vortexes

https://www.rs-online.com/designspark/inventors-and-the-invention-the-rolling-fluid-turbine?cm_mmc=US-EM-_-DSN_20170313-_-DM41417-_-TTB_URL4&cid=DM41417&bid=248985283

Having trouble watching the video, but the Czech prof is a smart guy.


Also:
"Verdant energy" launching floating thingie that spins in tidal flows.

https://energy.gov/articles/turbines-nyc-east-river-will-provide-power-9500-residents