Duncan Energy Partners L.P. Sells Additional Units.

HOUSTON -- Duncan Energy Partners L.P. (NYSE:DEP) today announced that the underwriters of DEP's initial public offering have exercised their option to purchase an additional 1,950,000 common units at the initial offering price of $21.00 per common unit. Duncan Energy Partners will use all of the net proceeds from the sale of the additional common units, after deducting underwriting discounts and commissions, to redeem an equal number of common units from an affiliate of Enterprise Products Partners L.P. (NYSE:EPD). As a result of the transactions, the affiliate of Enterprise Products Partners L.P. will own an aggregate of 5,351,571 common units representing approximately 26.4 percent of the outstanding common units of Duncan Energy Partners. The consummation of these transactions is expected to occur Feb. 5, 2007, concurrently with the closing of the initial public offering.

A written prospectus for the offering may be obtained from: Lehman Brothers Inc., c/o ADP Financial Services, Integrated Distribution Services, 1155 Long Island Avenue, Edgewood, NY 11717 (Email: [e-mail]) (Fax: [phone]); or UBS Investment Bank, 299 Park Avenue, New York, NY 10171, Attention: Prospectus Department (Telephone: [phone]).

Duncan Energy Partners L.P. is a publicly traded energy partnership that provides midstream energy services, including gathering, transportation, marketing and storage of natural gas, in addition to transportation and storage of natural gas liquids (NGLs) and petrochemicals. DEP's assets, which are located primarily in the Gulf Coast region of Texas and Louisiana, include interests in more than 1,000 miles of natural gas pipelines with a transportation capacity of approximately 1 billion cubic feet per day; nearly 600 miles of NGL and petrochemical pipelines featuring access to the world's largest fractionation complex at Mont Belvieu, Texas; and 33 underground salt dome caverns with about 100 million barrels of NGL storage capacity.