Shares of major wind turbine manufacturers slumped on European markets on Wednesday as the U.S. presidential election—with the two candidates differing strongly on energy policy—continued to be too close to call as of 10 a.m. ET. The biggest manufacturers of wind turbines have a strong presence on the U.S. wind market, which has been rapidly growing in recent years. U.S. President Donald Trump’s energy agenda continues to be pro-oil and favoring the fossil fuel industries, while Democratic candidate Joe Biden has an energy plan…