Ultra-Small Water Power Generator (4:41)
~ JVT-en, 2019-05-14
The $50 Water Turbine - DIY, Portable, Powerful, and Open Source (7:46)
~ OpenSourceLowTech, 2019-12-03
Decentralized electricity. Imagine car-sized generators, perhaps tow-able on wheels, that float to where you want, then you sink and/or anchor them. Or whatever. As long as it's smaller, local, and decentralized.
Running water is more reliable than the wind - and prevalent the world over. IMO, you only need giant dams for centralized power.