Duncan Energy Partners Declares Initial Quarterly Cash Distribution.

HOUSTON -- Duncan Energy Partners L.P. (NYSE:DEP) today announced that the board of directors of its general partner declared an initial quarterly cash distribution to partners of $0.40 per common unit, or $1.60 per unit on an annual basis. The initial distribution will be prorated for the portion of the fiscal quarter from the closing date of the initial public offering, beginning on February 5, 2007 to the end of the quarter on March 31, 2007, as described in the prospectus. The amount of the prorated distribution for the 55-day period is $0.244 per common unit and will be paid on May 9, 2007, to unitholders of record as of the close of business on April 30, 2007.

Duncan Energy Partners will announce its earnings for the first quarter of 2007 on Thursday, April 26, 2007, before the New York Stock Exchange opens for trading. The company will host a conference call at 2 p.m. CDT with analysts and investors to discuss first quarter earnings. The call will be broadcast live over the Internet and may be accessed at the company's website, www.deplp.com.

To access the webcast, participants should visit the "Investor Resources" section of the company's website at least fifteen minutes prior to the start of the conference call to download and install any necessary audio software. A replay of the webcast will be available for one week following the conference call and can be accessed one hour after the completion of the call.

Duncan Energy Partners L.P. is a publicly traded 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, 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.