compost piles are generally hotter than the surrounding airso, using thermo-couplers you might be able to squeeze out about 2 volts per couplerso 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 promisinghttp://dvice.com/archives/2007/08/mr_fusion_garbagebased_energy.php
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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.
Build a gasifier: https://www.instructables.com/id/Convert_your_Honda_Accord_to_run_on_trash/