Air Plan Approval; Alabama; Cross-State Air Pollution Rule

The Environmental Protection Agency (EPA) is proposing to approve portions of the October 26, 2015, State Implementation Plan (SIP) submittal from Alabama concerning the Cross-State Air Pollution Rule (CSAPR). Under CSAPR, large electricity generating units (EGUs) in Alabama are subject to Federal Implementation Plans (FIPs) requiring the units to participate in CSAPR's federal trading program for annual emissions of nitrogen oxides (NOX) and one of CSAPR's two federal trading programs for annual emissions of sulfur dioxide (SO2). This action would approve into Alabama's SIP the state's regulations requiring Alabama EGUs to participate in new CSAPR state trading programs for annual NOX and SO2 emissions integrated with the CSAPR federal trading programs, replacing the corresponding FIP requirements. These CSAPR state trading programs are substantively identical to the CSAPR federal trading programs except with regard to the provisions allocating emission allowances among Alabama units. EPA is proposing to approve the portions of the SIP revision concerning these CSAPR state trading programs because these portions of the SIP revision meet the requirements of the Clean Air Act (CAA or Act) and EPA's regulations for approval of a CSAPR full SIP revision replacing the requirements of a CSAPR FIP. Under the CSAPR regulations, approval of these portions of the SIP revision would automatically eliminate Alabama units' obligations to participate in CSAPR's federal trading programs for annual NOX and SO2 emissions under the corresponding CSAPR FIPs addressing interstate transport requirements for the 1997 and 2006 Fine Particulate Matter (PM2.5) national ambient air quality standards (NAAQS). Approval of these portions of the SIP revision would satisfy Alabama's good neighbor obligation under the CAA to prohibit emissions which will significantly contribute to nonattainment or interfere with maintenance of the 1997 and 2006 PM2.5 NAAQS in any other state. EPA is not proposing to act at this time on the portion of Alabama's SIP submittal intended to replace Alabama units' obligations to participate in CSAPR's federal trading program for ozone-season NOX emissions under a separate CSAPR FIP.