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This July 29, 2013, photo shows the entrance to a Luminant Mining 

This July 29, 2013, photo shows the entrance to a Luminant Mining Co. coal mine in Tatum, Texas. Decades of mining and power plant activity that helped East Texas towns grow and thrive could be threatened as a large energy provider faces possible bankruptcy. (AP Photo/LM Otero)
Associated Press
This July 29, 2013, photo shows the entrance to a Luminant Mining Co. coal mine in Tatum, Texas. Decades of mining and power plant activity that helped East Texas towns grow and thrive could be threatened as a large energy provider faces possible bankruptcy. (AP Photo/LM Otero)
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