How the Turbines in the Kölnbrein Dam are 92% Efficient | Richard Hammond’s Big

Richard Hammond explains how the turbines in Austria's Kölnbrein Dam manage to be 92% efficient, supplying electricity to houses all over the country. Subscribe to Discovery Australia for more great clips: https://bit.ly/DiscoveryAustralia #DiscoveryAustralia #RichardHammondsBig