Comments of ELCON et al. (“The Associations”), Approval and Promulgation of Implementation Plans; Texas and Oklahoma; Regional Haze State Implementation Plans; Interstate Transport State Implementation Plan to Address Pollution Affecting Visibility and Regional Haze; Federal Implementation Plan for Regional Haze and Interstate Transport of Pollution Affecting Visibility, Proposed Rule, Docket ID No. EPA-R06-OAR-2014-0754, FRL-9920-11-Region-6