Approval and Promulgation of Air Quality Implementation Plans; Maryland; Preconstruction Permitting Requirements for Electric Generating Stations in Maryland

EPA is granting limited approval of a State Implementation Plan (SIP) revision submitted by the Maryland Department of the Environment (MDE). This SIP revision revises and supplements the Maryland SIP by adding the preconstruction permitting requirements for electric generating stations that are required to receive a Certificate of Public Convenience and Necessity (CPCN) from the Maryland Public Service Commission (PSC) before commencing construction or modification. The SIP revision also requires electric generating stations to obtain a preconstruction permit from MDE when a CPCN is not required under the PSC regulations and statutes. EPA is granting limited approval of these revisions to Maryland's preconstruction program for electric generating stations in accordance with the requirements of the Clean Air Act (CAA).