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In certain conditions, dirt can form on the blades or, over time, the surface of the blade may degrade.  Also, ice can build up on a wind turbine.  These influences can affect the energy production of a wind farm in the ways described below.  Extremes of weather can also affect the energy production of a wind farm; as can the growth or felling of nearby trees. 


For wind farm sites located within or close to forests or other areas of trees, the impact of how the trees may change over time and the effect that this will have on the wind flow over the site, and consequently the energy production of the wind farm, must be considered.  The impact of the future felling of trees, if known, may also need to be assessed.

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