Cloud Peak Energy Inc. filed a noticed of winning bidder for the sale of substantially all the assets in the US Bankruptcy Court on August 16, 2019. As per the notice, auction held on August 15, 2019 and Navajo Transitional Energy Company, LLC has been selected as the winning bidder and Aspen Coal & Energy, LLC as the backup bidder. Sale hearing will be held on August 19, 2019.