Swedish start-up Minesto has been for years trying to float the idea of having underwater turbines that generate power for use on-shore. These would be anchored to the seafloor by a long tether and…
French company Airseas has developed the Seawing, a kite to help propel cargo ships, which it says could cut their carbon emissions by an average of 20%.
How about these underwater kite turbines that can generate energy from tidal waves?
https://hackaday.com/2023/11/15/underwater-kites-buoying-the-prospect-of-more-tidal-power-generation/
We could also install wind turbines in high-flying kites to increase efficiency.
This kite can harness wind energy to power maritime vessels, reducing their reliance on fossil fuels.
https://edition.cnn.com/2023/06/30/travel/airseas-giant-kites-ships-slash-carbon-emissions-scn-climate-spc/index.html
Kites can fly higher than wind turbines, thus harnessing more energy.