According to the Danish Wind Power Association, "Older Danish wind turbines (25-150 kW) have annual maintenance costs with an average of around 3 per cent of the original turbine investment. Newer turbines are on average substantially larger, which would tend to lower maintenance costs per kW installed power (you do not need to service a large, modern machine more often than a small one). For newer machines the estimates range around 1.5 to 2 per cent per year of the original turbine investment."
Source(s):
http://www.windpower.org/en/tour/econ/oandm.htm

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The economics of a 50-MW wind farm at a wind site with average wind speed of 13-17 mph:

Expenses:
-Debt: 60% (15 years at 9.5%)
-Distribution 22%
-Operation and maintenance (8%)
-Land, property taxes, or rent 5%
-Mgt fees, insurance 5%

I found the above in a very interesting article on the "Economics of Wind" which can be read here:
http://www.awea.org/pubs/factsheets/EconomicsOfWind-Feb2005.pdf

Obviously it will very according to many factors including the size of the wind farm, and the amount of debt that it takes on.
Source(s):
http://www.awea.org/pubs/factsheets/EconomicsOfWind-Feb2005.pdf

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