“The larger point is that a decline in the performance of offshore turbines due to ageing at a rate of 4.5% per year means that the effective economic life of such turbines is little more than 15 years. Power prices and operational arrangements after that period will have a very small effect on the decision to invest or not to invest in offshore generation.”
Page 36; WIND POWER ECONOMICS RHETORIC & REALITY Volume ii The Performance of Wind Power in Denmark
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Two reports; Professor Gordon Hughes, School of Economics, University of Edinburgh on 4 November 2020
WIND POWER ECONOMICS RHETORIC & REALITY Volume I Wind Power Costs in the United Kingdom
Mothers Against Wind Turbines Inc. 
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