The Navajo Generating Station is slated to close in 2019, and officials are considering several potential buyers to prevent the shutdown. In July, U.S. Interior Secretary Ryan Zinke and Salt River Project officials met with the U.S.-based company NantWorks. They discussed converting the coal-fired plant into a high-powered solar facility incorporating a new energy storage technique using molten salt. To find out exactly what this technology is, KNAU’s Ryan Heinsius spoke with University of Arizona engineering professor Peiwen Li who specializes in renewables.