There's a two-in-three chance that by the end of 2015 the PTC will either be extended for two years in its current shape or that Congress will broker a more permanent solution, such as a multi-year phase-out, predicts Joe Mikrut, partner at Capitol Tax Partners, a Washington DC-based consultancy focused on tax legislative issues.

Either outcome would be a victory for the US wind industry, which was left on tenterhooks by the expiration of the PTC at the end of last year.

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