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this post was submitted on 03 Jul 2023
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Showerthoughts
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I could be wrong, but I think geothermal may be the (sole?) exception to that. That heat is from the formation of the planet and radioactive decay (fission). That heat/energy would have coalesced during the accretion process regardless of whether the sun was adding energy. Again, I think. If I'm wrong, please enlighten as this is an interesting topic.
Edit: I was thinking I might be technically wrong since we can't really "renew" geothermal energy, but Wikipedia does have it classified as renewable:
Radioactive elements were formed in the last moments of a collapsing star, so even those were formed during fusion.
That is true. I guess it depends on how much of the heat is generated via fission processes and how much is just stored from planetary accretion. I don't have any numbers for that at this moment, but I will certainly concede that geothermal is fusion-assisted lol.