Exhibit 99.9
JOINT FILING AGREEMENT
In accordance with Rule 13d-1(k) promulgated under the Securities Exchange Act of 1934, as amended, each of the undersigned does hereby consent and agree to the joint filing on behalf of each of them of a Statement on Schedule 13D and all amendments thereto with respect to the units representing limited partner interests in Duncan Energy Partners L.P. beneficially owned by each of them, as applicable, and to the inclusion of this Joint Filing Agreement as an exhibit thereto.
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| Dated: May 18, 2010 | RANDA DUNCAN WILLIAMS
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| | By: | /s/ Randa Duncan Williams | |
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| Dated: May 18, 2010 | The DD LLC TRUSTEES pursuant to the Dan Duncan LLC Voting Trust Agreement
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| | By: | /s/ Randa Duncan Williams | |
| | | Randa Duncan Williams | |
| | | Trustee | |
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| | | /s/ Ralph S. Cunningham | |
| | | Dr. Ralph S. Cunningham | |
| | | Trustee | |
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| | | /s/ Richard H. Bachmann | |
| | | Richard H. Bachmann | |
| | | Trustee | |
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| Dated: May 18, 2010 | The EPCO TRUSTEES pursuant to the EPCO, Inc. Voting Trust Agreement
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| | By: | /s/ Randa Duncan Williams | |
| | | Randa Duncan Williams | |
| | | Trustee | |
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| | | /s/ Ralph S. Cunningham | |
| | | Dr. Ralph S. Cunningham | |
| | | Trustee | |
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| | | /s/ Richard H. Bachmann | |
| | | Richard H. Bachmann | |
| | | Trustee | |
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Joint Filing Agreement Signature Page
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| Dated: May 18, 2010 | The ESTATE of DAN L. DUNCAN
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| | By: | /s/ Randa Duncan Williams | |
| | | Randa Duncan Williams | |
| | | Independent Co-Executor | |
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| | | /s/ Ralph S. Cunningham | |
| | | Dr. Ralph S. Cunningham | |
| | | Independent Co-Executor | |
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| | | /s/ Richard H. Bachmann | |
| | | Richard H. Bachmann | |
| | | Independent Co-Executor | |
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| Dated: May 18, 2010 | DD SECURITIES LLC
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| | By: | /s/ W. Randall Fowler | |
| | | W. Randall Fowler | |
| | | Executive Vice President, Chief Financial Officer and Treasurer | |
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| Dated: May 18, 2010 | ENTERPRISE PRODUCTS COMPANY
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| | By: | /s/ Richard H. Bachmann | |
| | | Richard H. Bachmann | |
| | | Chief Executive Officer, President and
Chief Legal Officer | |
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| Dated: May 18, 2010 | EPCO/FANTOME, LLC
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| | By: | /s/ Richard H. Bachmann | |
| | | Richard H. Bachmann | |
| | | Executive Vice President, Chief Legal Officer and Secretary | |
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| Dated: May 18, 2010 | EPCO HOLDINGS, INC
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| | By: | /s/ Richard H. Bachmann | |
| | | Richard H. Bachmann | |
| | | Executive Vice President, Chief Legal Officer and Secretary | |
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Joint Filing Agreement Signature Page
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| Dated: May 18, 2010 | DAN DUNCAN LLC
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| | By: | /s/ Richard H. Bachmann | |
| | | Richard H. Bachmann | |
| | | Executive Vice President, Chief Legal Officer and Secretary | |
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| Dated: May 18, 2010 | EPE HOLDINGS, LLC
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| | By: | Dan Duncan LLC, its sole member | |
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| | By: | /s/ Richard H. Bachmann | |
| | | Richard H. Bachmann | |
| | | Executive Vice President, Chief Legal Officer and Secretary | |
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| Dated: May 18, 2010 | ENTERPRISE GP HOLDINGS L.P.
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| | By: | EPE Holdings, LLC, its general partner | |
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| | By: | Dan Duncan LLC, its sole member | |
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| | By: | /s/ Richard H. Bachmann | |
| | | Richard H. Bachmann | |
| | | Executive Vice President, Chief Legal Officer and Secretary | |
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| Dated: May 18, 2010 | ENTERPRISE PRODUCTS GP, LLC
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| | By: | /s/ Richard H. Bachmann | |
| | | Richard H. Bachmann | |
| | | Executive Vice President, Chief Legal Officer and Secretary | |
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| Dated: May 18, 2010 | ENTERPRISE PRODUCTS PARTNERS L.P.
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| | By: | Enterprise Products GP, LLC, its general partner | |
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| | By: | /s/ Richard H. Bachmann | |
| | | Richard H. Bachmann | |
| | | Executive Vice President, Chief Legal Officer and Secretary | |
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| Dated: May 18, 2010 | ENTERPRISE PRODUCTS OLPGP, INC.
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| | By: | /s/ Richard H. Bachmann | |
| | | Richard H. Bachmann | |
| | | Executive Vice President, Chief Legal Officer and Secretary | |
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Joint Filing Agreement Signature Page
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| Dated: May 18, 2010 | | ENTERPRISE PRODUCTS OPERATING LLC | | |
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| | | By: Enterprise Products OLPGP, Inc., its sole manager | | |
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| | | By: | | /s/ Richard H. Bachmann Richard H. Bachmann | | |
| | | | | Executive Vice President, Chief Legal Officer and Secretary | | |
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| Dated: May 18, 2010 | | ENTERPRISE PRODUCTS GTM, LLC | | |
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| | | By: | | /s/ Darryl E. Smith Darryl E. Smith | | |
| | | | | Manager | | |
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| Dated: May 18, 2010 | | ENTERPRISE GTMGP, LLC | | |
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| | | By: | | /s/ Michael A. Creel Michael A. Creel | | |
| | | | | Executive Vice President and Chief Financial Officer | | |
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| Dated: May 18, 2010 | | ENTERPRISE GTM HOLDINGS L.P. | | |
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| | | By: Enterprise GTMGP, LLC, its general partner | | |
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| | | By: | | /s/ Michael A. Creel Michael A. Creel | | |
| | | | | Executive Vice President and Chief Financial Officer | | |
Joint Filing Agreement Signature Page
