Free electricity… created by bright sparks

It is a mechanical problem that has troubled scientists since the ancient Greeks. Now a Scottish electrician has invented a small water wheel that could save thousands of pounds in energy bills.
Ian Gilmartin, 60, who has no mains electricity, is generating power from the stream in his garden. He and friend Bob Cattley, 58, have invented a mini water wheel capable of supplying enough electricity to power a house, with no running costs and zero carbon emissions.
The contraption is the first off-the-shelf water wheel system which can generate a good supply of electricity from a waterfall as little as 20cm in height.
The Herald