Construction vehicles transport a new section of pipeline. Derek Montgomery for MPR News 2017 In a victory for Line 3 oil pipeline opponents, the Minnesota Court of Appeals on Monday reversed the state Public Utilities Commission's approval of the Line 3 environmental review, saying it didn't address the potential impact of an oil spill into the Lake Superior watershed. Last year, the PUC approved Enbridge Energy's plan to replace its aging Line 3 oil pipeline, which has been transporting oil across northern Minnesota from Alberta, Canada, since the 1960s. • Rivers of oil: The battle over t...