High efficiency in slow moving water from 2 mph to over 6 mph
https://waterotor.com/our-solution/ "Waterotor’s breakthrough technology converts over 50% of the available energy in flowing water to electricity at speeds as slow as 2.0 mph (0.9 m/s). Waterotor will produce power as low as $0.05 per kW-hour at 5.5 mph (2.46 m/s) and lower than $0.15 at 4 mph (1.78 m/s)... bringing electricity to more than 2 billion people. Rivers, canals, and major ocean currents such as the Gulf Stream are all venues... Unlike propeller turbines submerged within water flow speeds that must be in excess of 6.5 mph" Related: Blowhole wave energy generator exceeds expectations in 12-month test https://newatlas.com/energy/blowhole-wave-energy-generator Rbust generator made from recycled material to harness wave power https://techxplore.com/news/2022-08-rbust-recycled-material-harness-power.html This Startup Is Building Generators That Can Power Up to 500 Homes Using Only Ocean Waves https://www.democratizing.finance/post/this-startup-is-building-generators-t...