X0303 4 2010-10-29 0 0001379378 Duncan Energy Partners L.P. DEP 0001387800 Havens Joe 1100 LOUISIANA STREET SUITE 1000 HOUSTON TX 77002 1 0 0 0 Common Units Representing Limited Partnership Interests 2010-10-29 4 P 0 37500 31.2367 A 69697.7832 D Represents the weighted average purchase price. The Units were purchased at various prices ranging from $30.80 to $31.71. Financial information regarding the number of Units purchased at each price will be provided upon the request of the United States Securities and Exchange Commission staff, the issuer, or a security holder of the issuer. This number includes 144.0326 units that were acquired under the issuer's distribution reinvestment plan. The Power of Attorney under which this form was signed is on file with the Commission. /s/Wendi S. Bickett, Attorney-in-Fact on behalf of Joe Havens 2010-11-02