SemGroup® and SemGas® are registered trademarks of SemGroup Corporation.About Exterran Exterran Holdings, Inc. is a global market leader in full service natural gas compression and a premier provider of operations, maintenance, service and equipment for oil and gas production, processing and transportation applications. Exterran Holdings serves customers across the energy spectrum--from producers to transporters to processors to storage owners. Headquartered in Houston, Texas, Exterran has more than 10,000 employees and operates in approximately 30 countries. For more information, visit www.exterran.com. Forward-Looking Statements Certain matters contained in this Press Release include “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. SemGroup and Exterran each make these forward-looking statements in reliance on the safe harbor protections provided under the Private Securities Litigation Reform Act of 1995. All statements, other than statements of historical fact, included in this Press Release are forward-looking statements, including but not limited to: expectations regarding industry prospects and future economic and market conditions; statements relating to the new plant and equipment, including the expected capacity and features of the new plant; and each company’s operational and financial strategies and ability to successfully effect those strategies. Although SemGroup and Exterran each believe that the expectations reflected in these forward-looking statements are reasonable, neither company can assure you that these expectations will prove to be correct. These forward-looking statements are subject to certain known and unknown risks and uncertainties, as well as assumptions that could cause actual results to differ materially from those reflected in these forward-looking statements. Factors that might cause actual results to differ include, but are not limited to: SemGroup’s ability to comply with the covenants contained in and maintain certain financial ratios required by its credit facilities; the possibility that SemGroup’s hedging activities may result in losses or may have a negative impact on its financial results; conditions in the oil and natural gas industry, including any sustained reduction in demand for the petroleum products SemGroup gathers, transports, processes and stores; SemGroup’s ability to obtain new sources of supply of petroleum products; Exterran’s ability to timely and cost-effectively execute larger projects; either company’s failure to comply with new or existing environmental laws or regulations or cross border laws or regulations; changes in safety, health, environmental and other regulations; the possibility that the construction or acquisition of new assets may not result in the corresponding anticipated revenue increases for SemGroup; any future impairment to SemGroup’s goodwill resulting from the loss of customers or business; changes in currency exchange rates; and the risks and uncertainties of doing business outside of the U.S., including political and economic instability and changes in local governmental laws, regulations and policies. These forward-looking statements are also affected by the risk factors, forward-looking statements and challenges and uncertainties described in each company’s Annual Report on Form 10-K for the year ended December 31, 2010, as well as those discussed from time to time in each company’s respective documents and reports filed with the SEC.