2016 Coal Supply Agreement. “2016 Coal Supply Agreement” means the Four Corners 2016 Coal Supply Agreement dated as of December 30, 2013 by and among Navajo Mine Coal Company, LLC (as predecessor by merger to Purchaser), APS, Public Service Company of New Mexico, Salt River Project Agricultural and Improvement District, and Tucson Electric Power Company, as amended by Amendment No. 1 to Four Corners 2016 Coal Supply Agreement, dated as of June 30, 2016. Seller became a party to the 2016 Coal Supply Agreement by Amendment 1 thereto.