Cloud Peak Energy CEO to Speak at 11th Annual Coaltrans USA Conference

Cloud Peak Energy Inc. (NYSE:CLD) announced that Colin Marshall, Cloud
Peak Energy′s President and Chief Executive Officer, will speak at the 11^th
Annual Coaltrans USA conference at 11:30 a.m. (EST) on Thursday,
February 3, 2011 in Miami, Florida.

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 the
third largest U.S. coal producer and the only pure-play Powder River
Basin (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.

Cloud Peak Energy Inc.

Karla Kimrey, 720-566-2932

Vice
President, Investor Relations