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ACT OF GOD: Investigations into the failure of a wind turbine blade when it was struck by lightning during a storm in the North Sea last week were expected to focus on the lightning conductor. Lightning struck one of three 33m long blades on one of two 2MW turbines 1km off the Northumberland coast at Blyth, shattering it. Investigations will centre on the way the turbine blades are connected to the 29m high mast via a system of cables and rollers.