Approval and Promulgation of Implementation Plans; New Hampshire: Prevention of Significant Deterioration; Greenhouse Gas Permitting Authority and Tailoring Rule

EPA is approving revisions to the New Hampshire State Implementation Plan (SIP), submitted by the New Hampshire Department of Environmental Services (NH DES) to EPA on February 7, 2011. The SIP revision modifies New Hampshire's Prevention of Significant Deterioration (PSD) program to establish appropriate emission thresholds for determining which new stationary sources and modification projects become subject to New Hampshire's PSD permitting requirements for their greenhouse gas (GHG) emissions. EPA proposed approval of these regulatory revisions on June 14, 2011, and received no comments. This action affects major stationary sources in New Hampshire that have GHG emissions above the thresholds established in the PSD regulations.