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How do i get electricity from organic garbage? Answered

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compost piles are generally hotter than the surrounding air
so, using thermo-couplers you might be able to squeeze out about 2 volts per coupler
so 60 couplers per pile you could get 120 volts, but the amperage would be in the crapper.
look into fusion garbage disposal - I hear that sounds promising
http://dvice.com/archives/2007/08/mr_fusion_garbagebased_energy.php

for small amounts - stick 2 different metals in it

That's not exactly getting electricity from energy stored in the garbage, it's getting it from the concentration of pure metal in your electrodes. You might as well use salt water for the electrolyte.