One of the most obvious sources of energy is the movement of the water in the oceans (mainly tidal). Earthtide has potential as well, but would be much more difficult to harness.
Marine energy includes waves, tides, and ocean temperature differentials. The entire human consumption of energy, worldwide is about 20-25,000 terrawatt-hours per year.
"There is the potential to develop 20,000–80,000 terawatt-hours per year (TWh/y) of electricity generated by changes in ocean temperatures, salt content, movements of tides, currents, waves and swells."
https://en.wikipedia.org/wiki/Marine_energy
In other words, the oceans could provide all the energy we ever need, if we can harness it.
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There are two major wave-energy installations in the world. One is in my second-favorite part of the world--Brittany, aka Bretagne, aka Finisterre, in France.
https://www.edf.fr/en/the-edf-group/industrial-provider/renewable-energies/marine-energy/tidal-power
The other is in Korea (also an awesome place).
But the newest one is in my favorite part of the world--the Oregon coast.
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I post this because right now, about a mile from where I live, an important research project focusing on marine energy is underway. Here's the link:
http://pacwaveenergy.org/south-test-site/
The next few years will tell if something significant comes out of this.
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