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A controversial 2010 law to close coal-fired power plants has put Colorado ahead of schedule to meet carbon restrictions proposed by President Barack Obama, the law’s supporters say.
Then-Gov. Bill Ritter signed the Clean Air-Clean Jobs Act of 2010, directing the state’s two investor-owned utilities — Xcel Energy and Black Hills Energy — to cut pollution or close coal-fired power plants they own in the state by 2017. They’re required to reduce nitrogen oxide, sulfur dioxide and mercury…