www.TheDoItYourselfWorld.com

Interesting a Bio Fuel cell that uses the Sun + plants + soil + bacteria to generate electricity day and night, hot and cold seasons

http://plant-e.com/

http://youtu.be/Ku1-_MOzkTE

When you think about it you cold make your whole lawn into a big massive Bio Fuel cell
you weave the electrodes like carpet mesh

I am considering an earth battery this summer. After the ground softens up that is. I hope to test out the ideas of getting power from the earth. The idea is to power small solar LED lights and dollar store window alarms to act as intrusion detectors without the need of replacing batteries all the time.