Ocean Hydrokinetics: Wave, Tidal, and Current

Here’s a cool little video that I post largely because it serves as a microcosm of human ingenuity.  How many different ways can you invent to solve the same problem (in this case, extracting the kinetic energy out of moving water)?  The answer: plenty.

The bad news is that, unless I’m mistaken, none of these will ever play an important role in the constellation of approaches to renewable energy, simply because the costs of solar and wind have fallen so sharply.