Here's a story that another library colleague found:
Cal State San Bernardino installed 20 elliptical fitness machines in the student recreation and fitness center that generates electricity from exercise to help power the building.
ReRev, a Clearwater, Florida-based company, has installed similar exercise machines in other universities and private fitness centers around the country.
ReRev technology works exclusively with Precor ellipticals to capture energy generated during a workout.
The energy is then sent to a central inverter which converts it from DC to AC power and returns it directly to the electrical grid.
Each machine generates about 100 watts of power per hour. A typical 30-minute workout can light a fluorescent light bulb for about two and a half hours, or a laptop or desktop computer for 30 minutes.
http://www.athleticbusiness.com/articles/lexisnexis.aspx?lnarticleid=1030140697&lntopicid=136030023
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