Clean Power Plan (CO2)

On Oct. 23, 2015, the U.S. Environmental Protection Agency (EPA) published a final Clean Power Plan (CPP) ruling in the Federal Register that mandates carbon dioxide (CO2) emission guidelines for existing fossil fuel-fired electric generating units (EGUs) under the Clean Air Act.

Using the same analytical framework as CPP, the EPA also issued a carbon rule affecting existing fossil fuel-fired EGUs located on tribal lands. NGS, located on the Navajo Nation, is regulated under this carbon rule for tribal sources.


On Feb. 9, 2016, the U.S. Supreme Court voted 5-4 to stay the implementation of CPP, following a grant request by 27 states to block the plan. CPP regulations will not be in effect while the legal challenge moves through the court system. SRP will continue to closely monitor the legal proceedings. For more information, visit the EPA's Clean Power Plan page.