Stepping on green slabs will power street lights and subway stations

February 1, 2010
San Grewal

Note: This article has been edited to correct a previously published version.

In the rush to develop alternative energy sources, harnessing the power of the sun and wind has captured the world's imagination. By comparison, capturing power from walking seems rather pedestrian.

But when you add up every step taken in a city such as London, with millions on foot every day expending kinetic energy that could be converted and stored as electricity, that's a pretty significant source of power.