World Architecture News has an article on an ambient energy collection device built by Pavegen - Pavement power.
According to inventor Laurence Kemball-Cook a paving stone on a busy street is stepped on by more than 50,000 pedestrians everyday and he’s seen the light by harvesting that pedestrian power. Every time the rubber Pavegen stone is stepped on, it flexes 5mm and the dynamo technology stores the kinetic energy produced.
The Pavegen System could power lights, computers, automatic doors and ticket machines at tube stations information displays, street lighting, shop frontages, train and bus timetables and wayfinding solutions.
The slab glows when stepped on indicating that energy has been generated to users. Five paving slabs distributed over a section of a pavement will provide sufficient power to illuminate a bus information panel overnight.