The Navajo Generating Station would meet the Environmental Protection Agency's clean-air requirements by shutting down one of its three units by 2020, a newspaper reported Friday.

The Arizona Republic said plant operator Salt River Project and its partners will make the proposal to the EPA.

That would allow the plant to meet the EPA's goal of an 84 percent reduction in nitrogen oxide emissions to clear the air over the nearby Grand Canyon.

The coal-fired Navajo plant at Page includes three 750-megawatt units, and under the proposal, one would be shuttered by 2020.

That would save a good bit of what plant operators have said would be a $1 billion upgrade to reduce the emissions, costs that would be passed along to electricity users throughout the state, most especially the Central Arizona Project.