The interconnection backlog for wind power has shrunk from an estimated 311 gigawatts in 2009 to 136 GW by early this year, thanks to ramped-up construction of wind-friendly power lines, among other factors, the American Wind Energy Association reported. However, wind-transmission bottlenecks still remain, particularly in the western part of the Midwest Independent Transmission System Operator's range, experts said. Moreover, policy issues, such as the lack of an adequate cost-allocation formula, could stymie future projects, experts said.

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