Subsidizing Public Transportation with Speeding Cars

11 January 2007 - 2:00pm

Harvesting wind energy from cars? Mark Oberholzer comes up with the innovative idea of harvesting energy from the wind of passing cars.

"How many speeding cars does it take to power a lightbulb? For Mark Oberholzer, a runner-up in the 2006 Metropolis Next Generation Design Competition, this might not be such an absurd question. His project proposed integrating ­turbines into the barriers between highway lanes that would harness the wind generated by passing cars to create energy. 'Opposing streams of traffic create really incredible potential in terms of a guaranteed wind source,' Oberholzer says."

"Oberholzer believes Jersey barriers are perfectly positioned to take advantage of the wind that passing cars generate. By replacing sections of solid concrete with Darius turbines he thinks they could harvest enough energy to power a light-rail line."

Source: Metropolis Magazine, January 10, 2007

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Fatal Flaw with this Idea

I’ve seen a number of stories about harnessing wind energy from traffic, but there’s one fatal flaw. Capturing the wind increases the wind resistance on the cars. The result is that the contributing drivers are paying for all of the wind energy with increased gasoline usage. To make matters worse, since the turbine efficiency is less than 100%, the turbines consume more energy from gasoline than they create.

I am a huge proponent of windpower, but on first principles, this idea just can’t work.

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The following list shows the top 10 metropolitan statistical areas, as defined by the U.S. Office of Management and Budget, where commuting by public transportation has grown the most. None of them are among the nation's top 10 most populous metro areas, and yet seven are within the top 20.