This was how the telegraph service got its DC power in the 1800's. Of course, you will get much more energy by using it in the ground and using copper tubing and 1/2" EMT pipe. Just type "Earth Battery" into youtube and lo k at other ideas people are using. Best of luck, and spread the knowledge!
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What is this picture showing in the ice-tray? is that wet dirt in the cube holes?
Its a youtube video. click on it to watch it.
Oh. Oops. :)
Very cool. Now I'm going to have to try that out asap.