Navajo Generating Station and Air Visibility Regulations: Alternatives and Impacts (Revised): Energy Analysis, NREL (National Renewable Energy Laboratory)

Pursuant to the Clean Air Act, the U.S. Environmental Protection Agency (EPA) announced in 2009 its intent to issue rules for controlling emissions from Navajo Generating Station that could affect visibility at the Grand Canyon and at several other national parks and wilderness areas. The final rule will conform to what EPA determines is the best available retrofit technology (BART) for thecontrol of haze-causing air pollutants, especially nitrogen oxides. While EPA is ultimately responsible for setting Navajo Generating Station?s BART standards in its final rule, it will be the U.S. Department of the Interior?s responsibility to manage compliance and the related impacts. This study aims to assist both Interior and EPA by providing an objective assessment of issues relating to thepower sector.