The federal government has come up with a final version of a rule meant to cut haze-causing emissions from the largest coal-fired power plant in the West.
The U.S. Environmental Protection Agency's decision Monday reflects a compromise by tribal and federal officials, environmental groups and the owners of the Navajo Generating Station, which is on track to cease operations in 2044.
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The rule gives the plant's owners the choice of either shutting down one of the 750-megawatt units or reducing power generation by an equal amount by 2020. The owners would have until 2030 to install pollution controls that would cut nitrogen-oxide emissions by 80 percent.
The plant ensures water deliveries to Phoenix and Tucson, helps fulfill water settlements, and fuels the economies of the Navajo and Hopi tribes.