Reuters: The U.S. wind power industry had its slowest quarter since 2007 in the just-ended third quarter, as investors turned away from the sector after Congress did not pass a renewable power mandate, an industry group said. The American Wind Energy Association (AWEA) said U.S. developers added 395 megawatts of electricity capacity at wind farms in the third quarter — the slowest quarter since 2007. Year-to-date installations of 1,634 MW, were down 72 percent versus the same period last year. The…