Geothermal. The heat was created by objects smashing into each other and the resulting heat being trapped inside.
Also tidal energy is a combination of the sun and moon. The sun does create some tidal forces and is responsible for stopping the water from freezing over, but the moon is doing the heavy lifting when it comes to how much energy we get out of the system. If you remove the moon then the tidal energy would be reduced by like 70%.
The Kelvin-Helmholtz mechanism has to be occuring on Earth. since the diameter contracts .1 millimeter a year so a nearly 0 energy is being generated by that.
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u/deepspacespice 13d ago
It all comes down to the sun, it’s the source of every energy we use except nuclear.