Vestas Wind Systems said late Wednesday it will shut down its research and development offices in Louisville and in two other states, rather than consolidate them in Brighton as it announced less than a month ago... The Danish wind-turbine maker ... Vestas will close its three R&D offices in the United States by the end of the second quarter in 2013.” The other two offices are in Houston and Marlborough, Mass. ... Vestas repeatedly has blamed the pending expiration of a U.S. wind-power production tax credit for weakening demand for its products, leading to job cutbacks. That tax credit, which...