Alternative Energy

Published on September 11th, 2009 | by Derek Markham

Electricity from Trees Powers Electronic Circuit

Researchers at the University of Washington have developed a process for tapping into the electrical power of trees, and are successfully running an electronic circuit powered entirely from tree power. The power is in very small voltages, but has now been demonstrated to be usable, and could really change the way we look at trees.

Image: AthenaTree Power

Tree Power

Last year, the team from UW found that plants can generate a voltage of up to 200 millivolts from an electrode in a plant and one in the soil surrounding it. That technology is now being developed for forest sensors. The team wanted to further their tree power research by running a circuit powered solely by trees, and by succeeding, they showed us another unique trait of our leafy friends.

Image: University of Washingtontreepower

Tree Power

“As far as we know this is the first peer-reviewed paper of someone powering something entirely by sticking electrodes into a tree.” – Babak Parviz, UW associate professor of electrical engineering

One of the co-authors of the study, Carlton Himes, a UW undergraduate student, spent last summer hooking nails to trees and connecting a voltmeter to explore likely sites. Bigleaf maples, which are common on the UW campus, generate a steady voltage of up to a few hundred millivolts, he found. The team next built a device that could run on the available power.

Co-author Brian Otis led the development of a boost converter, which takes a low incoming voltage and stores it to then produce a greater output. The team’s custom boost converter works for inputs of as little as 20 millivolts, lower than any existing such device. The output voltage from the device is 1.1 volts, enough to run low-power sensors.

The circuit built by the UW team is made from tiny parts – 130 nanometers – and consumes just 10 nanowatts of power when operating. That’s not really the range for anything you or I would hook up (no iPod adapters for tree power), but shows some potential for what is doable with the power.

Image: University of Washingtontreepowercircuit

Tree Power Circuit

“Normal electronics are not going to run on the types of voltages and currents that we get out of a tree. But the nanoscale is not just in size, but also in the energy and power consumption.” – Parviz

The researchers are quick to point out that tree power is different from the potato or lemon experiment, in which two different metals react with the food, creating an electric potential difference that causes a current to flow. “We specifically didn’t want to confuse this effect with the potato effect, so we used the same metal for both electrodes,” says Parviz

So far, the source of the voltage and the purpose for it in trees hasn’t been established, but some feel that it’s a form of signaling in trees, similar to that which happens in the human body. Researchers are interested in investigating what the tree is doing with the electricity, and compared it to finding a ‘pulse’ for the trees.

The study is being published in the journal Institute of Electrical and Electronics Engineers’ Transactions on Nanotechnology, and was funded in part by the National Science Foundation.

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About the Author

lives in southwestern New Mexico and digs bicycles, simple living, organic gardening, sustainable lifestyle design, slacklining, bouldering, and permaculture. He loves good food, with fresh roasted chiles at the top of his list of favorites. Catch up with Derek on Twitter, RebelMouse, Google+, or at his natural parenting site, Natural Papa!

13 Responses to Electricity from Trees Powers Electronic Circuit

  1. Name (required) says:

    can u able to show circuit diagram please

  2. prabagar says:

    PLS SEND THE CIRCUIT DIAGRAM TO MY MAIL ID IAm very interested to see that

  3. Mike Holland says:

    The “we can only get less than half a volt” refrain is silly , guys; connect many trees in series and you can up the voltage to 120 with ease… The question not answered here is the amerage. That will tell you if a reasonable number of trees can be connected to provide usable (power this iPhone usable).

  4. Chad says:

    I am also interested in how you have assembled the basic circuit/basic technology

  5. Federico Mejia says:

    I Have and idea to produce power, if anybody interest please send e mail to

  6. Richard C. Braddock says:

    Could the electricity simply re a by-product of photosynthesis. Or maybe even the cause of photosynthesis.

  7. mahesh chahare says:

    plz send me the circuit diagram of this ……….

  8. jessica says:

    hello. I am wanting to know more on the tree power. Email me some info!

  9. Jessica says:

    I need to know more on TREE POWER!!!!! How does it work?!?!?!!

  10. Noufal K says:

    I am very interested in these sought of technical ideas, could you plz send me the circuit diagram to my mail id.

  11. ajay says:

    plz send me the circuit diagram of this. I am very interested to see that…..

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