According to a recent study done by BNEF, the cost of running and maintaining wind farms has fallen 38 percent in four years as competition among contractors increased and turbine performance improved, bringing closer the day that the technology matches fossil fuel.

The average price of operation and maintenance contracts for onshore farms this year slid to 19,200 euros ($25,000) a megawatt from 30,900 euros in 2008, Bloomberg New Energy Finance said today. It took data from 38 developers and service providers in more than 24 markets for its first O&M Price Index. Read more about reduced operating costs for wind.