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Coal Power Plants

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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.

A

Not generating enough gigawatts of electricity.

B

Electricity demand in their region has decreased enough to make them unnecessary.

C

Lack of access to coal.

D

Government mandate that these plants close.

E

Inability of the plants to meet pollution regulations and the cost of natural gas.