This summer at the largest urban mall in London, visitors may notice something different at their feet.

This summer at the largest urban mall in London, visitors may notice something different at their feet. Twenty bright green rubber tiles will decorate one of the outdoor walkways at the mall. Next to it lies the new Olympic stadium in east London. The squares aren't just ornamental. They are designed to collect the energy created by pedestrians. It is estimated that 40 million pedestrians will use that walkway in a year. It will generate several hundred kilowatt-hours of electricity from the footsteps. That's enough to power half the mall's out-door lighting. The tiles were developed and produced in 2009 by a 26-year-old Londoner. The 17.7-by-23.6-inch tiles are designed to be used wherever pedestrians gather en masse: transportation hubs such as train, subway, and bus stations, airports, schools,malls. The power is generated from millions of footfalls. It can be used to power a range of lightings, signs ,digital ads ,etc. Nearly 30 such projects have been installed in Europe.For two years now, four of its tiles have lined a hallway at a school near London. They collect energy from footfalls of its 1,100 students to keep the corridor lit. Music festival attendees’ footfalls have also been controlled to charge cell phones and power lights.