FILE - In this Nov. 13, 2013 file photo, the Ameren Corp. coal-fired power plant is seen outside the southern Illinois town of Newton. Illinois officials say the state will need a mix of power sources... more 
FILE - In this Nov. 13, 2013 file photo, the Ameren Corp. coal-fired power plant is seen outside the southern Illinois town of Newton. Illinois officials say the state will need a mix of power sources and energy efficiency initiatives to meet proposed federal limits for carbon pollution. On Monday, June 2, 2014, the Obama administration unveiled a plan to cut carbon dioxide emissions from power plants by 30 percent by 2030. About 40 percent of Illinois' energy comes from coal. (AP Photo/Jim Suhr, File) less 
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Associated Press | Photo By Jim Suhr, File
Mon, Jun 2, 2014 1:21 PM EDT