Cloud Peak Energy Inc. (NYSE:CLD) announced that Colin Marshall, Cloud Peak Energy’s President and Chief Executive Officer, will speak at the Howard Weil 40th Annual Energy Conference at 2:30 p.m. (CT) on Monday, March 26, 2012 in New Orleans, Louisiana.

For additional investor information, please visit the investor relations section of the Cloud Peak Energy website: www.cloudpeakenergy.com/investor-relations.

About Cloud Peak Energy®

Cloud Peak Energy Inc. (NYSE:CLD) is headquartered in Wyoming and is one of the largest U.S. coal producers 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 1,600 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.