If the P90 wind-speed is within 12-15% of the average, banks are usually happy to stump up. But a difference of 20% or higher renders a wind farm “unfinanceable”, says Mr Murley.

如果p90的风速在平均值的12-15%范围内，银行通常会很高兴提供贷款，但是20%的差距，或者更高，就会给风力厂开出“不能提供贷款”，穆勒先生说。

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"We need to be wary of generalizations, " said Alex Murley.

CNN: Can 'small wind' reap big rewards?