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What is the MOST likely reason why the coal power plants in the graph were retired in 2015?
"U.S. Energy Information Administration - EIA - Independent Statistics and Analysis." Coal Made up More than 80% of Retired Electricity Generating Capacity in 2015. N.p., n.d. Web. 29 Mar. 2016. http://www.eia.gov/todayinenergy/detail.cfm?id=25272.
Not generating enough gigawatts of electricity.
Electricity demand in their region has decreased enough to make them unnecessary.
Lack of access to coal.
Government mandate that these plants close.
Inability of the plants to meet pollution regulations and the cost of natural gas.