Daily Mail
For onshore wind, the monthly ‘load factor’ of turbines – a measure of how much electricity they generate as a percentage of how much they could produce if on at full power all the time - dropped from a high of 24 per cent in the first year after construction, to just 11 per cent after 15 years.
For offshore wind –examined only in Denmark where it has been used for longer - it declined even more dramatically from over 40 per cent at the start, to just 15 per cent after ten years.
He believes they become uneconomic after around 12 years. The decline in output was put down to wear and tear of the blades, and more frequent breakdowns for older turbines.
His report for the anti-wind farm charity the Renewable Energy Foundation (KEEP), noted: ‘Onshore wind turbines represent a relatively mature technology, which ought to have achieved a satisfactory level of reliability in operation as plants age. Unfortunately detailed analysis of the relationship between age and performance gives a rather different picture…’
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