exv10w66






Exhibit 10.66




SUPPLEMENTAL INDENTURE




     Supplemental
Indenture (this “Supplemental Indenture”), dated as of August 10, 2010 is among
Targa MLP Capital LLC, a Delaware limited liability company (the “Guaranteeing Subsidiary”), Targa
Resources Partners LP, a Delaware limited partnership (“Targa Resources Partners”), and Targa
Resources Partners Finance Corporation (“Finance Corporation” and, together with Targa Resources
Partners, the “Issuers”), the other Guarantors (as defined in the Indenture referred to herein) and
U.S. Bank National Association, as trustee under the Indenture referred to below (the “Trustee”).



INTRODUCTION




     The Issuers have executed and delivered to the Trustee an indenture (the “Indenture”) dated as
of July 6, 2009 providing for the issuance of 111/4% Senior Notes due 2017 (the “Notes”).



     The Indenture provides that under certain circumstances the Guaranteeing Subsidiary shall
execute and deliver to the Trustee a supplemental indenture pursuant to which the Guaranteeing
Subsidiary shall unconditionally guarantee all of the Issuers’ Obligations under the Notes and the
Indenture (the “Note Guarantee”).



     Pursuant to Section 9.01 of the Indenture, the Trustee is authorized to execute and deliver
this Supplemental Indenture.



     NOW, THEREFORE, in consideration of the foregoing and for other good and valuable
consideration, the receipt of which is hereby acknowledged, the Guaranteeing Subsidiary and the
Trustee mutually agree for the equal and ratable benefit of the Holders of the Notes as follows:



     1. Capitalized Terms. Capitalized terms used herein without definition shall have the
meanings assigned to them in the Indenture.



     2. Agreement to Guarantee. The Guaranteeing Subsidiary hereby agrees to provide an
unconditional Guarantee on the terms and subject to the conditions set forth in the Indenture
including Article 10 thereof.



     3. No Recourse Against Others. No past, present or future director, officer,
employee, incorporator, stockholder or agent of the Guaranteeing Subsidiary, as such, shall have
any liability for any obligations of the Issuers or any Guaranteeing Subsidiary under the Notes,
any Note Guarantees, the Indenture or this Supplemental Indenture or for any claim based on, in
respect of, or by reason of, such obligations or their creation. Each Holder of the Notes by
accepting a Note waives and releases all such liability. The waiver and release are part of the
consideration for issuance of the Notes. Such waiver may not be effective to waive liabilities
under the federal securities laws and it is the view of the SEC that such a waiver is against
public policy.



     4. NEW YORK LAW TO GOVERN. THE LAW OF THE STATE OF NEW YORK SHALL GOVERN AND BE USED
TO CONSTRUE THIS SUPPLEMENTAL INDENTURE.



 









 





     5. Counterparts. The Parties may sign any number of copies of this Supplemental
Indenture. Each signed copy shall be an original, but all of them together represent the same
agreement.



     6. Effect of Headings. The Section headings herein are for convenience only and shall
not affect the construction hereof.



     7. The Trustee. The Trustee shall not be responsible in any manner whatsoever for or
in respect of the validity or sufficiency of this Supplemental Indenture or for or in respect of
the recitals contained herein, all of which recitals are made solely by the Guaranteeing Subsidiary
and the Issuers.



Signature pages follow.




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     IN WITNESS WHEREOF, the parties hereto have caused this Supplemental Indenture to be duly
executed and attested, all as of the date first above written.



	 	 	 	 	 

	 	 	TARGA MLP CAPITAL LLC
	 
	 	 	 	 
	 

	 	By:
	 	/s/ Matthew J. Meloy
	 	 	 	 	 
	 

	 	Name:
	 	Matthew J. Meloy
	 

	 	Title:
	 	Vice President — Finance and Treasurer
	 
	 	 	 	 
	 	 	TARGA RESOURCES PARTNERS LP
	 
	 	 	 	 
	 

	 	By:
	 	Targa Resources GP LLC,

its general partner
	 
	 	 	 	 
	 

	 	By:
	 	/s/ Matthew J. Meloy
	 	 	 	 	 
	 

	 	Name:
	 	Matthew J. Meloy
	 

	 	Title:
	 	Vice President — Finance and Treasurer
	 
	 	 	 	 
	 	 	TARGA RESOURCES PARTNERS FINANCE CORPORATION
	 
	 	 	 	 
	 

	 	By:
	 	/s/ Matthew J. Meloy
	 	 	 	 	 
	 

	 	Name:
	 	Matthew J. Meloy
	 

	 	Title:
	 	Vice President — Finance and Treasurer
	 
	 	 	 	 
	 	 	U.S. BANK NATIONAL ASSOCIATION,
	 	 	as Trustee
	 
	 	 	 	 
	 

	 	By:
	 	/s/ Steven A. Finklea
	 	 	 	 	 
	 

	 	 	 	Authorized Signatory







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