The idea of using the pressure of people walking on a paving stone to generate electricty.
OK, not too tough, bit of piezo electrics and you\’re away. However:
The relatively high cost of the modules remained a deterrent, he said, but should not put off authorities in cities where the political will was strong.
It doesn\’t actually work which is a small problem. \”Work\” as in the sense of being sensible to do that is. The capital cost is higher than the value of any electricity being generated. Only those looking for a political stunt should do it.
Ah, so it\’s just like almost all green technologies then.