Whilst in the construction phase, as stated within
http://www.scottish-e...uction-appraisal.ashx
The industry 'cost metric' for windfarms is currently £800K per rated MW. The highest value item in a windfarm development is the turbine (comprising nacelle, turbine blades and towers) which are typically estimated to account for up to 65-70% of the overall development cost.
However,as noted by
http://www.windustry....do-wind-turbines-cost
Wind turbines under 100 kilowatts cost roughly $3,000 to $5,000 per kilowatt of capacity. That means a 10 kilowatt machine (the size needed to power an average home) might cost $35,000-$50,000.
And in the decommisiong phase, as noted by
http://www.wind-watch...osts-lessons-learned/
The other study estimated demo costs of $97K/turbine vs. $70K/turbine by Beech Ridge. The bottom line is that using the demolition costs from the other wind turbine project decommissioning study would translate to a Beech Ridge demo cost of $12.03 million, i.e., $3.35 million more the applicant’s $8.68 million estimate. (Note: In another very recent project I have just reviewed, the decommissioning costs were again severely underestimated by more than 50% by not taking into account recent crane rental rates, extremely low earth moving costs, and assuming high productivity rates (6 turbines/wk).)
As seen, there are costs involved with all construction, and electricity generation, it's just the choices made against the cost benfits which need addressing, but as the majority of UK based actually generate for under 20% of the time, then repayment of the costs inherent with wind farms will take longer than the assertion above, i.e
They pay back the construction costs in about a year..
http://www.windmeasur...bines/om-turbines.php
A modern wind turbines will be designed to work for 120 000 hours throughout their estimated life-span of 20 years. This would be the turbine operating for approximately 66% of the time for two decades.