Press Release Details

SEAL BEACH, Calif. (May 25, 2007) – Clean Energy Fuels, Corp. (NASDAQ: CLNE) today announced the pricing of its initial public offering of 10,000,000 shares of its common stock at a price to the public of $12.00 per share.

The net proceeds to the Company from this offering of approximately $108.8 million is expected to be used to build an LNG liquefaction plant and CNG and LNG fueling stations, to finance the purchase of natural gas vehicles by the Company's customers, and for general corporate purposes. Selling stockholders have granted the underwriters a 30-day option to purchase up to an additional 1,500,000 shares of common stock to cover over-allotments, if any. The Company expects to close the offering on May 31, 2007. Following the closing, the shares will trade on the NASDAQ Global Market under the symbol "CLNE."

W.R. Hambrecht + Co., LLC led the offering, which was made through WR Hambrecht + Co's OpenIPO auction-based process. Simmons & Company International, Susquehanna Financial Group, LLP, and NBF Securities (USA) Corp. acted as co-managers of the offering.

Copies of the final prospectus relating to the offering may be obtained from WR Hambrecht + Co at www.wrhambrecht.com by writing to P.O. Box 677, Berwyn, PA 19132, or by calling 1-800-673-6476. Clean Energy is the leading provider of natural gas as an alternative fuel for vehicle fleets in the United States and Canada, offering a comprehensive solution to enable vehicle fleets to run on natural gas as an alternative to gasoline or diesel.

This press release shall not constitute an offer to sell or a solicitation of an offer to buy any securities of the Company, nor will 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.

This release contains forward-looking statements relating to future events and the Company's expectations regarding the offering and its use of proceeds. Although the Company believes that such expectations are reasonable, it can give no assurance that such expectations will provide to be correct. Except as required by law, including U.S. securities laws and rules of the SEC, the Company does not plan to publicly update or revise any forward-looking statements, whether as a result of any new information, future events or otherwise. Before you invest in the Company's stock, you should read the section entitled "Risk Factors" in the prospectus relating to the offering.

Contact:

John Mills/Ina McGuinness
ICR, Inc.
310 954 1100

Richard Wheeler, CFO
Clean Energy Fuels, Inc.
562 493 2804