Cloud Peak Energy Inc. (NYSE:CLD), one of the largest U.S. coal producers and the only pure-play Powder River Basin (PRB) coal company, plans to announce its third quarter 2011 financial results on October 27, 2011, after the markets close. A conference call with management is scheduled at 5:00 p.m. ET on October 27, 2011, to review the results and current business conditions. The call will be webcast live over the internet from the Company's website at www.cloudpeakenergy.com under “Investor Relations.” Participants should follow the instructions provided on the website for downloading and installing the audio applications necessary to join the webcast. Interested individuals also can access the live conference call via telephone at 866.770.7125 (domestic) or 617.213.8066 (international) and entering pass code 28966800. Following the live web cast, a replay will be available at the same URL on the company’s Web site for seven days. A telephonic replay will also be available approximately two hours after the call and can be accessed by dialing 888.286.8010 (domestic) or 617.801.6888 (international) and entering pass code 90412427. The telephonic replay will be available for seven days. About Cloud Peak Energy® Cloud Peak Energy Inc. (NYSE:CLD) is headquartered in Wyoming and is one of the largest coal producers in the United States. As one of the safest coal producers in the nation, Cloud Peak Energy specializes in the production of low sulfur, sub-bituminous coal. The company owns and operates three surface coal mines in the Powder River Basin, the lowest cost major coal producing region in the nation. The Antelope mine and Cordero Rojo mine are located in Wyoming and the Spring Creek mine is located near Decker, Montana. With approximately 1,550 employees, the company is widely recognized for its exemplary performance in its safety and environmental programs. Cloud Peak Energy is a sustainable fuel supplier for approximately 4 percent of the nation’s electricity.