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As most of you know my work is related to landscaping mainly by the arches and other garden products I make, usually with the involvement of big hammers, however it has interested me that two different types of plants that are growing next to each other in the same bed grow at different rates. It seemed obvious to me that one plant, the faster growing of the two was making more efficient uses of the resources available to it than its' neighbour. I wondered further if some of the energy of the more efficient plant could be converted directly into electrical energy generation instead. I am aware that the faster growing plant can be harvested and burnt to produce heat but that wasn't my thinking.
It looks like some very bright people with the right skills are thinking on similar lines, you may find this article interesting.

Electricity from plants