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A worker walks past rows of power lines in Mississauga, Ontario, on Aug. 19, 2019, one of 37 electricity transmission networks that provides power to both sides of the border. Nathan Denette/The Canadian Press
Ontario’s decision to put a 25 percent surcharge on electricity exports to the United States on March 10 caused enough attention south of the border for U.S. President Donald Trump to vow to double the 25 percent aluminum and steel tariffs on Canada scheduled for March 12.