Sometimes The ROI Is Not So Great

Not the best ROI.

Common Sense with Paul Jacob - Expensive Cheap Energy: "Such seems to be the notion behind the University of North Texas’s decision to install 36 'elliptical' exercise machines to turn the school into what the manufacturer, ReRev, calls 'the largest human power plant in the world.' The machines reportedly cost the school $20,000 and presumably required energy to build, pack, ship. But the machines also convert energy exerted during exercise to electricity at the rate of one kilowatt-hour every two days. A kilowatt-hour costs on average about ten cents in the North Texas area. So the cycling produces less than a penny of energy per hour."