Cloud Peak Energy Inc. Appoints Todd A. Myers as Head of Business Development

Gillette, WY, July 6, 2010 – Cloud Peak Energy Inc. (NYSE:CLD), the third-largest U.S. coal producer and the only pure-play Powder River Basin (PRB) coal company, announced that Todd A. Myers joined the company as Senior Vice President, Business Development on July 6, 2010. Myers has 14 years of experience with Westmoreland Coal Company and was most recently President of Westmoreland Coal Sales Company. Myers served in other senior leadership positions with Westmoreland in marketing and business development. Myers also spent five years with RDI Consulting, a leading consulting firm in the energy industry, where he led the environmental consulting practice. Myers earned his Bachelor of Arts in political science from Pennsylvania State University in University Park, Pennsylvania, and his Masters in International Management from the Thunderbird Graduate School of Global Management in Glendale, Arizona. President and Chief Executive Officer Colin Marshall said, "Todd brings a strong background in the coal industry and broader energy sector. We welcome Todd as a member of our senior management team and look forward to his leadership in helping shape and execute Cloud Peak Energy’s growth strategy."

About Cloud Peak Energy™

Cloud Peak Energy Inc. (NYSE:CLD) is headquartered in Wyoming and is the third largest U.S. coal producer and the only pure-play PRB coal company. As one of the safest coal producers in the nation, Cloud Peak Energy specializes in the production of low sulfur, subbituminous coal. The company owns and operates three surface coal mines in the PRB, the lowest cost major coal producing region in the nation. The Antelope and Cordero Rojo mines are located in Wyoming and the Spring Creek Mine is located near Decker, Montana. With approximately 1,500 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.