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Some UW researchers have determined that if you add a couple of similar metals in a tree it produces electricity. Though only 200 mV so we won’t be moving to tree power anytime soon. Though the articles mentions some applications such as detecting environmental conditions or forest fires.
To me the most interesting part is they don’t exactly know the cause of this voltage, though they theorize that “there seems to be some signaling in trees, similar to what happens in the human body but with slower speed.”