The Environmental Protection Agency (EPA) is finalizing approval of a revision to North Carolina's regional haze State Implementation Plan (SIP), submitted by the North Carolina Department of Environmental Quality (formerly known as the North Carolina Department of Environment and Natural Resources (NC DENR)) on October 31, 2014, that relies on an alternative to Best Available Retrofit Technology (BART) to satisfy BART requirements for electric generating units (EGUs) formerly subject to the Clean Air Interstate Rule (CAIR). EPA is also finalizing its determination that final approval of this SIP revision corrects the deficiencies that led to EPA's limited disapproval of the State's regional haze SIP on June 7, 2012, and is converting EPA's June 27, 2012, limited approval to a full approval. This submittal addresses the requirements of the Clean Air Act (CAA or Act) and EPA's rules that require states to prevent any future, and remedy any existing, manmade impairment of visibility in mandatory Class I areas caused by emissions of air pollutants from numerous sources located over a wide geographic area (also referred to as the regional haze program). States are required to assure reasonable progress toward the national goal of achieving natural visibility conditions in Class I areas.