NEW WORRIES ABOUT the environment, technology advances and tax break extensions are empowering European wind energy companies to try their luck in the United States.

The U.S. has led the world in installing new wind turbines for the past two years, but it still ranks behind Germany and slightly below Spain in wind power production, according to the Global Wind Energy Council. Now, America’s renewed embrace of policies to encourage energy alternatives have led companies with years of experience in Denmark, Germany and Spain to invest in U.S. shores, challenging both the U.S. market leaders and any environmental opposition to building giant turbines.