The underwater 'kites' generating electricity as they move
https://www.bbc.com/news/business-59401199 "two kites - with a five-metre (16ft) wingspan - move underwater in a figure-of-eight pattern, absorbing energy from the running tide. They are tethered to the fjord seabed by 40-metre metal cables... moving "flight path" allows the kite to sweep a larger area at a speed several times greater than that of the underwater current... on-board computer steers the kite into the prevailing current, then idles it at slack tide... Each kite can produce enough electricity to power approximately 50 to 70 homes" Related: This spine-like wave energy generator claims to beat fossil fuels on price https://interestingengineering.com/innovation/floating-device-generate-power-waves Tidal Energy To Be Harvested By Majestic Underwater Kites (Dragon Class) https://minesto.com/products/kite-systems/ Underwater turbines in Normandy to generate electricity from the tides https://www.heise.de/en/news/Underwater-turbines-in-Normandy-to-generate-e...