Cloud Peak Energy Inc. Announces Full Exercise of Over-Allotment Option by Underwriters in Secondary Offering of Common Stock on Behalf of Selling Shareholders


December 21, 2010



Public Company Information:


GILLETTE, Wyo.--(BUSINESS WIRE)--Cloud Peak Energy Inc. (NYSE:CLD) announced today that the underwriters for the recently announced secondary offering of Cloud Peak Energy Inc. common stock on behalf of selling shareholders Rio Tinto Energy America Inc. and its affiliate have exercised their over-allotment option to purchase an additional 3,800,000 shares of Cloud Peak Energy Inc.’s common stock in full. The 29,400,000 shares of Cloud Peak Energy Inc., including the 3,800,000 shares subject to the over-allotment option, were sold at a price to the public of $19.50 per share by the selling shareholders.

The secondary offering, which closed on December 21, 2010, and the exercise of the over-allotment option, which also closed on December 21, 2010, resulted in the divestment of 100 percent of Rio Tinto’s holdings in Cloud Peak Energy. As a result of these transactions, Cloud Peak Energy Resources LLC is now a wholly owned subsidiary of Cloud Peak Energy Inc.

Credit Suisse Securities (USA) LLC, Morgan Stanley & Co. Incorporated, RBC Capital Markets, LLC and J.P. Morgan Securities LLC acted as joint book-running managers for the offering.

A shelf registration statement relating to the offering of the common shares has previously been filed with the U.S. Securities and Exchange Commission and has become effective. This press release shall not constitute an offer to sell or a solicitation of an offer to buy, nor shall there be any sale of these securities in any state or jurisdiction in which such an offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state or jurisdiction.

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.

Cautionary Note Regarding Forward-Looking Statements

This press release contains “forward-looking statements” within the meaning of the safe harbor provisions of Section 27A of the Securities Act and Section 21E of the Securities Exchange Act of 1934, as amended (the “Exchange Act”). Forward-looking statements are not statements of historical facts and often contain words such as “may,” “will,” “expect,” “believe,” “anticipate,” “plan,” “estimate,” “seek,” “could,” “should,” “intend,” “potential,” or words of similar meaning. Forward-looking statements are based on management’s current expectations or beliefs, as well as assumptions and estimates regarding our company, industry, economic conditions, government regulations and other factors. These statements are subject to significant risks, uncertainties and assumptions that are difficult to predict and could cause actual results to differ materially from those expressed or implied in the forward-looking statements. We make forward-looking statements based on currently available information, and we assume no obligation to, and expressly disclaim any obligation to, update or revise publicly any forward-looking statements made in this press release, whether as a result of new information, future events or otherwise, except as required by law.


Cloud Peak Energy Inc.
Karla Kimrey, 720-566-2932
Vice President, Investor Relations

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