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The Future of Hydroelectric Power: From Mountain Streams to Ocean Tides
A more down-to-Earth episode for Isaac Arthur -- he doesn't get to Outer Space until the last few minutes. :)

The most interesting new concept IMHO is Dynamic Tidal Power. More adaptable to extended, shallow coastlines than barrages. It seems like barrier islands would make good candidates. Two half-circular fish farms to create a venturi with turbines at it's throat.

Toward the end he hints at deep-sea power sources, but says it's speculative and doesn't mention OTEC

Quote:

Ocean thermal energy conversion
Ocean thermal energy conversion is a renewable energy technology that harnesses the temperature difference between the warm surface waters of the ocean and the cold depths to run a heat engine to produce electricity. It is a unique form of clean energy generation that has the potential to provide a consistent and sustainable source of power. Although it has challenges to overcome, OTEC has the potential to provide a consistent and sustainable source of clean energy, particularly in tropical regions with access to deep ocean water. Wikipedia