October 31, 2008

Duncan Energy Partners Changes Payment Date for Quarterly Cash Distribution

Duncan Energy Partners L.P. (NYSE:DEP) today announced that it has changed the payment date for its third quarter 2008 cash distribution from November 11, 2008 to November 12, 2008 in recognition of the bank holiday commemorating Veterans Day. On October 15, 2008, Duncan Energy Partners announced that the board of directors of its general partner declared a cash distribution of $0.42 per common unit to partners for the third quarter of 2008, to be paid to unitholders of record at the close of business October 31, 2008.

Duncan Energy Partners 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 approximately 100 million barrels of NGL storage capacity.