Cloud Peak Energy Executive to Speak at Barclays CEO Energy-Power Conference

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,
today announced that Colin Marshall, Cloud Peak Energy′s President and
Chief Executive Officer, will speak at the Barclays CEO Energy-Power
Conference at 3:05 p.m. (ET) on Thursday, September 6, 2012 in New York,
New York.

For additional investor information, please visit the investor relations
section of the Cloud Peak Energy web site: 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. Cloud Peak Energy also owns rights to
substantial undeveloped coal and complimentary surface assets in the
Northern PRB, further building the company′s long-term position to serve
Asian export and domestic customers. 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% of the nation′s electricity.

Cloud Peak Energy Inc.

Karla Kimrey, 720-566-2932

Vice
President, Investor Relations