The Government’s flagship “renewables” policy is to spend £100 billion on 10,000 onshore and offshore wind turbines, adding to the 3,000 we already have (which are so inefficient that their combined output last year was equivalent to one modest coal-fired plant). Apart from the colossal cost (suppliers must buy electricity from wind at double or treble the price of conventional power, passed on through our energy bills), there is no way that more than a fraction of the 6,000 offshore turbines the Government dreams of could be built by 2020, since this would require erecting two such huge structures every day for 10 years, when installing just one can take weeks. Even so, the more turbines we have, the more we will need new gas-fired power plants to provide back-up for when the wind drops – emitting as much CO2 as the turbines nominally save.