Many alternative energies fall back on the elements. High in demand is wind.
For proof, look no further than a design student in Berlin. He has developed a lamppost powered by four rotor blades.
Tiny currents, created by passing cars or tunnels between buildings, are converted into electricity by a 300 watt generator.
Initial tests at an ideal height of 3-6 meters supplied around 12 volts, which can be stored in an integrated battery. Enough for an LED light.
Thanks to an infrared motion sensor the self-sufficient streetlight only switches on when someone passes underneath it.
The light points exclusively downwards and, measuring 2800 on the Kelvin scale, attracts almost no insects.
A good companion for blooming lights.