Trees not only reduce electricity use, they can also generate electricty according to MIT researchers; Boston, MA

How to generate electricity from a tree?

Ians September 9th, 2009 WASHINGTON
There’s enough power in trees to run an electronic circuit, says a new study.
A study last year led by the Massachusetts Institute of Technology (MIT) found that plants generate up to 200 millivolts when one electrode is placed in a plant and the other in the surrounding soil.