United Press International: The wind energy industry is beginning to repower existing turbines for greater efficiency and expanding to offshore locations in Europe, and despite unstable incentives for wind power in the United States, strong growth potential and the weak dollar are buoying interest in the U.S. market. For most firms, the biggest barrier to the U.S. market is the lack of stable incentives. The Production Tax Credit, which was due to expire at the end of 2007, was renewed in 2006 for one …