Document:

Omnibus Agreement

 Exhibit 10.4 

 
  

 
 OMNIBUS AGREEMENT

 BY AND AMONG 
 WESTERN GAS EQUITY PARTNERS, LP 
 WESTERN GAS EQUITY HOLDINGS, LLC

 AND 
 ANADARKO PETROLEUM CORPORATION 
  

 
  

 OMNIBUS AGREEMENT 

This Omnibus Agreement (“Agreement”) is entered into on, and effective as of, the Closing Date (as defined herein), and
is by and among Western Gas Equity Partners, LP, a Delaware limited partnership (the “Partnership”), Western Gas Equity Holdings, LLC, a Delaware limited liability company (the “General Partner”), and Anadarko
Petroleum Corporation, a Delaware corporation (“Anadarko”). The above-named entities are sometimes referred to in this Agreement each as a “Party” and collectively as the “Parties.” 

R E C I T A L S: 
 The Parties desire by their execution of this Agreement to evidence their understanding, as more fully set forth in Article II of this Agreement, with respect to the agreement of Anadarko to provide or
cause to be provided, and the agreement of the Partnership to reimburse and compensate Anadarko for the provision of, certain general and administrative services. 
 In consideration of the premises, covenants, conditions, and agreements contained herein, and for other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the
Parties hereby agree as follows: 
 ARTICLE I 
 DEFINITIONS 
 1.1 Definitions. (a) Capitalized terms
used herein but not defined shall have the meanings given them in the Partnership Agreement. 
 (b) As used in this Agreement,
the following terms shall have the respective meanings set forth below: 
 “Administrative Fee” is defined in
Section 2.1(c). 
 “Affiliate” means, with respect to any Person, (a) any other Person directly or
indirectly controlling, controlled by or under common control with such Person, (b) any Person owning or controlling fifty percent (50%) or more of the voting interests of such Person, (c) any officer or director of such Person, or
(d) any Person who is an officer, director, trustee, or holder of fifty percent (50%) or more of the voting interest of any Person described in clauses (a) through (c). For purposes of this definition, the term “controls,”
“is controlled by” or “is under common control with” shall mean the possession, direct or indirect, of the power to direct or cause the direction of the management and policies of a Person, whether through the ownership of Voting
Securities, by contract or otherwise. 
 “Agreement” means this Omnibus Agreement, as it may be amended,
modified or supplemented from time to time in accordance with the terms hereof. 
 “Anadarko” is defined in the
preamble to this Agreement. 

  
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Equity Partners, LP 
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 “Anadarko Entities” means Anadarko and any other Person controlled by
Anadarko other than the Partnership Entities. For purposes of this definition, “control” means the possession, direct or indirect, of the power to direct or cause the direction of the management and policies of a Person, whether through
ownership of Voting Securities, by contract or otherwise. 
 “Change of Control” means, with respect to any
Person (the “Applicable Person”), any of the following events: (i) any sale, lease, exchange or other transfer (in one transaction or a series of related transactions) of all or substantially all of the Applicable Person’s
assets to any other Person, unless immediately following such sale, lease, exchange or other transfer such assets are owned, directly or indirectly, by the Applicable Person; (ii) the dissolution or liquidation of the Applicable Person;
(iii) the consolidation or merger of the Applicable Person with or into another Person pursuant to a transaction in which the outstanding Voting Securities of the Applicable Person are changed into or exchanged for cash, securities or other
property, other than any such transaction where (A) the outstanding Voting Securities of the Applicable Person are changed into or exchanged for Voting Securities of the surviving Person or its parent and (B) the holders of the Voting
Securities of the Applicable Person immediately prior to such transaction own, directly or indirectly, not less than a majority of the outstanding Voting Securities of the surviving Person or its parent immediately after such transaction; and
(iv) a “person” or “group” (within the meaning of Sections 13(d) or 14(d)(2) of the Exchange Act) other than Anadarko or any Affiliate of Anadarko becomes the “beneficial owner” (as defined in Rules 13d-3 and 13d-5
under the Exchange Act) of more than 50% of all of the then outstanding Voting Securities of the Applicable Person, other than in a merger or consolidation which would not constitute a Change of Control under clause (iii) above. 

“Closing Date” means the date of the closing of the initial public offering of Common Units. 

“CP Index” is defined in Section 2.1(c). 
 “General Partner” is defined in the preamble to this Agreement. 

“MLP Omnibus Agreement” means that certain Omnibus Agreement, dated as of May 14, 2008, by and among Western Gas
Partners, LP, Western Gas Holdings, LLC and Anadarko, as heretofore amended. 
 “Partnership” is defined in the
preamble to this Agreement. 
 “Partnership Agreement” means the First Amended and Restated Agreement of
Limited Partnership of the Partnership, dated as of the Closing Date, as such agreement is in effect on the Closing Date, to which reference is hereby made for all purposes of this Agreement. 

“Partnership Entities” means the General Partner and each member of the Partnership Group. 

“Partnership Group” means the Partnership and its Subsidiaries (other than Western Gas Partners, LP and its
Subsidiaries) treated as a single consolidated entity. 

  
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Equity Partners, LP 
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 “Party” and “Parties” are defined in the preamble to this
Agreement. 
 “Person” means an individual, corporation, partnership, joint venture, trust, limited liability
company, unincorporated organization or any other entity. 
 “Subsidiary” means, with respect to any Person,
(i) a corporation of which more than 50% of the voting power of shares entitled (without regard to the occurrence of any contingency) to vote in the election of directors or other governing body of such corporation is owned, directly or
indirectly, at the date of determination, by such Person, by one or more Subsidiaries of such Person or a combination thereof, (ii) a partnership (whether general or limited) in which such Person or a Subsidiary of such Person is, at the date
of determination, a general partner, but only if such Person, directly or indirectly through one or more Subsidiaries of such Person, or a combination thereof, controls such partnership on the date of determination, or (iii) any other Person
(other than a corporation or a partnership) in which such Person, one or more Subsidiaries of such Person, or a combination thereof, directly or indirectly, at the date of determination, has (A) at least a majority ownership interest or
(B) the power to elect or direct the election of a majority of the directors or other governing body of such Person. 

“Voting Securities” means securities of any class of a Person entitling the holders thereof to vote in the election of,
or to appoint, members of the board of directors or other similar governing body of the Person. 
 ARTICLE II 

SERVICES 

2.1 Provision of Services; Reimbursement and Administrative Fee. 

(a) Anadarko hereby agrees to cause the Anadarko Entities to continue to provide the Partnership Entities with certain general and
administrative services, such as legal, accounting, treasury, cash management, insurance, administrative and claims processing, risk management, health, safety and environmental, information technology, human resources, credit, payroll, internal
audit, tax, marketing and midstream. These general and administrative services shall be substantially identical in nature and quality to the services of such type previously provided by the Anadarko Entities to Western Gas Partners, LP and its
Subsidiaries pursuant to the MLP Omnibus Agreement. 
 (b) The Partnership Group hereby agrees to reimburse Anadarko for all
cash expenses and expenditures that the Anadarko Entities incur or payments they make on behalf of the Partnership Entities for the general and administrative services provided for in Section 2.1(a). 

(c) In addition to the reimbursement obligation described in Section 2.1(b), the Partnership shall pay Anadarko (or an Anadarko
Entity designated by Anadarko) an administrative fee (the “Administrative Fee”) of $250,000 per year (subject to adjustment as specified below), payable in arrears in equal quarterly installments on or before the 30th day following
the end of each fiscal quarter following the Closing Date (pro rated to account for any 

  
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Equity Partners, LP 
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partial quarterly period). On January 1, 2014 and each January 1st thereafter, the Administrative Fee shall be increased by the percentage increase in the Consumer Price Index – All
Urban Consumers, U.S. City Average, Not Seasonally Adjusted (the “CP Index”). In making such adjustment, the Administrative Fee shall be increased by the CP Index for the prior year period based on the most recent information
available from the U.S. Department of Labor. 
 2.2 Reimbursement for Publicly Traded Partnership Expenses. The
Partnership Entities hereby agree to reimburse Anadarko for all expenses and expenditures that the Anadarko Entities incur or payments that they make as a result of the Partnership’s becoming a publicly traded partnership, including (but not
limited to) expenses associated with annual and quarterly reporting; tax return and Schedule K-1 preparation and distribution expenses; Sarbanes-Oxley compliance expenses; expenses associated with listing on the New York Stock Exchange; independent
auditor fees; legal fees; investor relations expenses; and registrar and transfer agent fees. Furthermore, the Partnership Entities agree to reimburse Anadarko for any such expenses incurred on or before the Closing Date by the Anadarko Entities on
behalf of the Partnership Entities. 
 2.3 Reimbursement for Insurance. The Partnership Entities hereby agree to
reimburse Anadarko for all expenses that the Anadarko Entities incur or payments that they make on behalf of the Partnership Entities for insurance coverage with respect to the Partnership Assets. 

2.4 Reimbursement Procedures. On or before the fifth business day of each month, Anadarko shall send an invoice to the
General Partner for that amount of money associated with all expenses or expenditures incurred or payments made by the Anadarko Entities during the preceding month that are to be reimbursed by the Partnership Entities pursuant to Sections 2.1(b),
2.2 and 2.3 hereof. Where it is not reasonably practicable to determine the cost of such an expense, expenditure or payment, Anadarko or the applicable Anadarko Entity may make a good faith reasonable estimate of such expense, expenditure or payment
(and provided that any such estimates, other than with respect to benefit load, are “trued up” within 10 days of the end of each quarter based on the actual amount of the expenses, expenditures or payments in respect of which estimates
were made in the immediately preceding quarter). Subject to the parenthetical clause in the immediately preceding sentence, the Partnership Entities shall accept any estimate or benefit load described in this paragraph, provided that such estimate
is reasonable and made in good faith. The Partnership Entities shall pay such invoice within 30 days of receipt. 
 ARTICLE
III 
 MISCELLANEOUS 
 3.1 Accuracy of Recitals. The paragraphs contained in the recitals to this Agreement are incorporated in this Agreement by this reference, and the Parties to this Agreement acknowledge the
accuracy thereof. 

  
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Equity Partners, LP 
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 3.2 Choice of Law; Submission to Jurisdiction. This Agreement shall be subject
to and governed by the laws of the State of Texas. Each Party hereby submits to the jurisdiction of the state and federal courts in the State of Texas and to venue in Houston, Texas. 

3.3 Notices. Any notice, demand, or communication required or permitted under this Agreement shall be in writing and
delivered personally, by reputable courier, or by telecopier, and shall be deemed to have been duly given as of the date and time reflected on the delivery receipt if delivered personally or sent by reputable courier service, or on the automatic
telecopier receipt if sent by telecopier, addressed as follows: 
 If to Anadarko: 

Anadarko Petroleum Corporation 
 1201 Lake Robbins Drive 
 The Woodlands, Texas 77380 

Attn: General Counsel 
 Fax: 832-636-3214 
 If to the Partnership or the General Partner: 

Western Gas Equity Holdings, LLC 
 1201 Lake Robbins Drive 
 The Woodlands, Texas 77380 

Attn: President 

Fax: 832-636-6001 
 A Party may
change its address for the purposes of notices hereunder by giving notice to the other Party specifying such changed address in the manner specified in this Section 3.3. 
 3.4 Further Assurances. The Parties agree to execute such additional instruments, agreements and documents, and to take such other actions, as may be necessary to effect the purposes of this
Agreement. 
 3.5 Agreement. This Agreement constitutes the entire agreement of the Parties relating to the
matters contained herein, superseding all prior contracts or agreements, whether oral or written, relating to the matters contained herein. 
 3.6 Termination. This Agreement shall terminate upon a Change of Control of the General Partner or the Partnership, other than any Change of Control of the General Partner or the Partnership
that may be deemed to have occurred pursuant to clause (iv) of the definition of Change of Control solely as a result of a Change of Control of Anadarko. Notwithstanding any other provision of this Agreement, if the General Partner is removed
as general partner of the Partnership under circumstances where Cause does not exist and Common Units held by the General Partner and its Affiliates are not voted in favor of such removal, this Agreement may immediately thereupon be terminated by
Anadarko. 

  
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Equity Partners, LP 
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 3.7 Effect of Waiver or Consent. No waiver or consent, express or implied, by
any Party to or of any breach or default by any Person in the performance by such Person of its obligations hereunder shall be deemed or construed to be a consent or waiver to or of any other breach or default in the performance by such Person of
the same or any other obligations of such Person hereunder. Failure on the part of a Party to complain of any act of any Person or to declare any Person in default, irrespective of how long such failure continues, shall not constitute a waiver by
such Party of its rights hereunder until the applicable statute of limitations period has run. 
 3.8 Amendment or
Modification. This Agreement may be amended or modified from time to time only by the written agreement of all the Parties. Each such instrument shall be reduced to writing and shall be designated on its face an “Amendment” or an
“Addendum” to this Agreement. 
 3.9 Assignment; Third-Party Beneficiaries. No Party shall have the
right to assign its rights or obligations under this Agreement without the prior written consent of the other Parties. Each of the Parties hereto specifically intends that each entity comprising the Anadarko Entities and the Partnership Entities, as
applicable, whether or not a Party to this Agreement, shall be entitled to assert rights and remedies hereunder as third-party beneficiaries hereto with respect to those provisions of this Agreement affording a right, benefit or privilege to any
such entity. 
 3.10 Counterparts. This Agreement may be executed in any number of counterparts with the same
effect as if all signatory Parties had signed the same document. All counterparts shall be construed together and shall constitute one and the same instrument. 
 3.11 Severability. If any provision of this Agreement or the application thereof to any Person or circumstance shall be held invalid or unenforceable to any extent, the remainder of this
Agreement and the application of such provision to other Persons or circumstances shall not be affected thereby and shall be enforced to the greatest extent permitted by law. 
 3.12 Interpretation. In this Agreement, unless a clear contrary intention appears: (a) the singular includes the plural and vice versa; (b) reference to any Person includes such
Person’s successors and assigns but, in the case of any Party, only if such successors and assigns are permitted by this Agreement, and reference to a Person in a particular capacity excludes such Person in any other capacity;
(c) reference to any gender includes each other gender; (d) reference to any agreement (including this Agreement), document or instrument means such agreement, document, or instrument as amended or modified and in effect from time to time
in accordance with the terms thereof and, if applicable, the terms of this Agreement; (e) reference to any Section means such Section of this Agreement, and references in any Section or definition to any clause means such clause of such Section
or definition; (f) “hereunder,” “hereof,” “hereto” and words of similar import will be deemed references to this Agreement as a whole and not to any particular Section or other provision hereof or thereof;
(g) “including” (and with correlative meaning “include”) means including without limiting the generality of any description preceding such term; and (h) relative to the determination of any period of time,
“from” means “from and including,” “to” means “to but excluding” and “through” means “through and including.” 

  
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Equity Partners, LP 
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 3.13 Titles and Headings. Section titles and headings in this Agreement are
inserted for convenience of reference only and are not intended to be a part of, or to affect the meaning or interpretation of, this Agreement. 
 3.14 Relationship of the Parties. 
 (a) Nothing in this Agreement
shall cause any of the Anadarko Entities or the Partnership Entities to become members of any other partnership, joint venture, association, syndicate or other entity. Nothing in this Agreement shall cause any Partnership Entity to be considered an
Anadarko Entity, and vice versa. 
 (b) For purposes of this Agreement, no Partnership Entity shall be deemed to be an Affiliate
of the Anadarko Entities nor shall any Anadarko Entity be deemed to be an Affiliate of any the Partnership Entities. 

3.15 Binding Effect. This Agreement will be binding upon, and will inure to the benefit of, the Parties and their
respective successors, permitted assigns and legal representatives. 
 3.16 Time of the Essence. Time is of the
essence in the performance of this Agreement. 
 3.17 Delay or Partial Exercise Not Waiver. No failure or delay on
the part of any Party to exercise any right or remedy under this Agreement will operate as a waiver thereof; nor shall any single or partial exercise of any right or remedy under this Agreement preclude any other or further exercise thereof or the
exercise of any other right or remedy granted hereby or any related document. The waiver by either Party of a breach of any provisions of this Agreement will not constitute a waiver of a similar breach in the future or of any other breach or nullify
the effectiveness of such provision. 
 3.18 Withholding or Granting of Consent. Unless otherwise provided in this
Agreement, each Party may, with respect to any consent or approval that it is entitled to grant pursuant to this Agreement, grant or withhold such consent or approval in its sole and uncontrolled discretion, with or without cause, and subject to
such conditions as it shall deem appropriate. 
 3.19 Laws and Regulations. Notwithstanding any provision of this
Agreement to the contrary, no Party shall be required to take any act, or fail to take any act, under this Agreement if the effect thereof would be to cause such Party to be in violation of any applicable law, statute, rule or regulation.

 3.20 Negation of Rights of Limited Partners, Assignees and Third Parties. Except as set forth in
Section 3.9, the provisions of this Agreement are enforceable solely by the Parties, and no limited partner, member, or assignee of Anadarko, the Partnership, the General Partner or other Person shall have the right, separate and apart from
Anadarko, the Partnership or the General Partner, to enforce any provision of this Agreement or to compel any Party to comply with the terms of this Agreement. 

  
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Equity Partners, LP 
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 3.21 No Recourse Against Officers or Directors. For the avoidance of doubt,
the provisions of this Agreement shall not give rise to any right of recourse against any officer or director of any Anadarko Entity or any Partnership Entity. 
 3.22 Signatories Duly Authorized. Each of the signatories to this Agreement represents that he is duly authorized to execute this Agreement on behalf of the Party for which he is signing,
and that such signature is sufficient to bind the Party purportedly represented. 
 [Signature page
follows] 

  
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Equity Partners, LP 
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 IN WITNESS WHEREOF, the Parties have executed this Agreement on, and effective as of, the
Closing Date. 
  

			
	WESTERN GAS EQUITY PARTNERS, LP
		
	 By:
	 	WESTERN GAS EQUITY HOLDINGS, LLC, its general partner
		
	 By:
	 	/s/ Donald R. Sinclair
		 	 Name Donald R. Sinclair

		 	 Title: President and Chief Executive Officer

	
	WESTERN GAS EQUITY HOLDINGS, LLC
		
	 By:
	 	/s/ Donald R. Sinclair
		 	 Name: Donald R. Sinclair

		 	 Title: President and Chief Executive Officer

	
	ANADARKO PETROLEUM CORPORATION
		
	 By:
	 	/s/ Robert G. Gwin
		 	 Name: Robert G. Gwin

		 	 Title: Senior Vice President, Finance and Chief Financial Officer

 Signature Page–Omnibus Agreement of 

Western Gas Equity Partners, LPTax  Sharing Agreement

 Exhibit 10.5 
 TAX SHARING AGREEMENT 
 BY AND AMONG 

ANADARKO PETROLEUM CORPORATION 
 AND 
 WESTERN GAS EQUITY PARTNERS, LP 

December 12, 2012 

 TAX SHARING AGREEMENT 

BY AND AMONG 

ANADARKO PETROLEUM CORPORATION AND 
 WESTERN GAS EQUITY PARTNERS, LP 
 Tax Sharing Agreement (the
“Agreement”), dated this 12th day of December, 2012, by and among ANADARKO PETROLEUM CORPORATION (“Anadarko”), a Delaware corporation, and WESTERN GAS EQUITY PARTNERS, LP (the “Partnership”), a
Delaware limited partnership. 
 RECITALS 
 WHEREAS, Anadarko is the common parent of an affiliated group of corporations within the meaning of Section 1504(a) of the Code (as defined below), which currently files a consolidated federal income
tax return; 
 WHEREAS, the Partnership Group (as defined below) includes various entities that may be required to join with
Anadarko in the filing of a consolidated, combined or unitary state tax return; 
 WHEREAS, the Parties (as defined below) wish
to set forth the general principles under which they will allocate and share various Taxes (as defined below) and related liabilities; 
 WHEREAS, Anadarko, on behalf of itself and its present and future subsidiaries other than the Partnership Group (“Anadarko Group”), and the Partnership, on behalf of itself and its
present and future subsidiaries (the “Partnership Group”), are entering into this Agreement to provide for the allocation among the Anadarko Group and the Partnership Group of all responsibilities, liabilities and benefits relating
to any Tax for which a Combined Return (as defined below) is filed for a taxable period including or beginning on or after the Effective Date (as defined below) and to provide for certain other matters; 

NOW, THEREFORE, in consideration of the mutual agreements, provisions and covenants contained in this Agreement, and other good and
valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the Parties hereby agree as follows: 

ARTICLE I 

Definitions 
 1.1 Definitions. The following terms shall have the following meanings (such meanings to be equally applicable to both the singular and the plural forms of the terms defined): 

“Accounting Referee” is defined in Section 6.11 herein. 

“Anadarko Group” is defined in the Recitals to this Agreement. 

“Code” means the Internal Revenue Code of 1986, as amended, or any successor thereto, as in effect for the taxable
period in question. 

  
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 “Combined Group” means a group of corporations or other entities that files
a Combined Return. 
 “Combined Return” means any Tax Return (other than a Tax Return for U.S. federal income
taxes) filed on a consolidated, combined (including nexus combination, worldwide combination, domestic combination, line of business combination or any other form of combination) or unitary basis that includes activities of any member of the
Anadarko Group and any member of the Partnership Group. 
 “Effective Date” means 7:00 a.m., Central time, on
December 12, 2012. 
 “Final Determination” means the final resolution of any Tax (or other matter) for a
taxable period, including related interest or penalties, that, under applicable law, is not subject to further appeal, review or modification through proceedings or otherwise, including (i) by the expiration of a statute of limitations or a
period for the filing of claims for refunds, amending Tax Returns, appealing from adverse determinations or recovering any refund (including by offset), (ii) by a decision, judgment, decree or other order by a court of competent jurisdiction,
which has become final and unappealable, (iii) by a closing agreement, an accepted offer in compromise or a comparable agreement under laws of the particular Tax Authority, (iv) by execution of a form under the laws of a Tax Authority that
is comparable to an Internal Revenue Service Form 870 or 870-AD (excluding, however, with respect to a particular Tax Item for a particular taxable period any such form that reserves (whether by its terms or by operation of law) the right of the
taxpayer to file a claim for refund and/or the right of the Tax Authority to assert a further deficiency with respect to such Tax Item for such period) or (v) by any allowance of a refund or credit, but only after the expiration of all periods
during which such refund may be adjusted. 
 “Notice” is defined in Section 6.1 herein. 

“Partnership Group” is defined in the recitals to this Agreement. 

“Partnership Group Combined Tax Liability” means, with respect to any Tax, the Partnership Group’s liability for
such Tax owed with respect to a Combined Return for a taxable period, as determined under Section 3.2 of this Agreement. 

“Partnership Group Deposit” is defined in Section 3.4 herein. 

“Partnership Group Members” means those entities included in the Partnership Group. 

“Partnership Group Pro Forma Combined Return” means a pro forma Combined Return or other schedule prepared pursuant to
Section 3.2 of this Agreement. 
 “Party” means each of Anadarko and the Partnership, and solely for
purposes of this definition, “Anadarko” includes the Anadarko Group and the “Partnership” includes the Partnership Group. Each of Anadarko and the Partnership shall cause the Anadarko Group and the Partnership Group,
respectively, to comply with this Agreement. 

  
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 “Tax Attribute” means a Tax Item of a member of the Partnership Group
reflected on a Combined Return that is comparable to one or more of the following attributes with respect to a U.S. federal income tax consolidated tax return: a net operating loss, a net capital loss, an unused investment credit, an unused foreign
tax credit, an excess charitable contribution, a U.S. federal minimum tax credit or a U.S. federal general business credit (but not tax basis or earnings and profits). 
 “Tax Authority” means a domestic governmental authority (other than the United States) or any subdivision, agency, commission or authority thereof or any quasi-governmental or private
body having jurisdiction over the assessment, determination, collection or imposition of any Tax (excluding the U.S. Internal Revenue Service). 
 “Tax Controversy” means any audit, examination, dispute, suit, action, litigation or other judicial or administrative proceeding initiated by Anadarko or the Partnership or any Tax
Authority. 
 “Tax Item” means any item of income, gain, loss, deduction or credit, or other item reflected on
a Tax Return or any Tax Attribute. 
 “Tax Return” means any return, report, certificate, form or similar
statement or document (including any related or supporting information or schedule attached thereto and any information return, amended Tax Return, claim for refund or declaration of estimated tax) required to be supplied to, or filed with, a Tax
Authority in connection with the determination, assessment or collection of any Tax or the administration of any laws, regulations or administrative requirements relating to any Tax. 

“Taxes” means all forms of taxation, whenever created or imposed, and whether imposed by a domestic, local, municipal,
governmental, state, federation or other body, but excluding taxes imposed by the United States, and without limiting the generality of the foregoing, shall include net income, alternative or add-on minimum, gross income, sales, use, ad valorem,
gross receipts, value added, franchise, profits, license, transfer, recording, withholding, payroll, employment, excise, severance, stamp, occupation, premium, property, windfall profit, custom duty or other tax, governmental fee or like assessment
or charge of any kind whatsoever, together with any related interest, penalties or other additions to tax, or additional amounts imposed by any such Tax Authority. 
 “WES Tax Sharing Agreement” means that certain Tax Sharing Agreement, dated May 14, 2008, by and between Anadarko and Western Gas Partners, LP, a Delaware limited partnership.

 Any term used but not capitalized herein that is defined in the Code or in the Treasury Regulations thereunder shall, to the
extent required by the context of the provision at issue, have the meaning assigned to it in the Code or such regulation. 

  
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 ARTICLE II 
 Preparation and Filing of Tax Returns 
 2.1 Manner of Filing.

 (a) For periods that include the Effective Date and periods after the Effective Date, Anadarko shall have the sole and
exclusive responsibility for the preparation and filing of, and shall prepare and file, all Combined Returns or cause to be prepared and filed all Combined Returns. Anadarko shall be authorized to take any and all action necessary or incidental to
the preparation and filing of a Combined Return, including, without limitation, (i) making elections and adopting accounting methods, (ii) filing all extensions of time, including extensions of time for payment of tax, (iii) filing
claims for refund or credit or (iv) giving waivers or bonds. 
 (b) For periods that include the Effective Date and periods
after the Effective Date, the Partnership Group shall have the sole and exclusive responsibility for the preparation and filing of, and shall prepare and file or cause to be prepared and filed, all Tax Returns of the Partnership Group Members that
are not Combined Returns. 
 (c) Anadarko shall have sole discretion to include, or cause to be included, in a Combined Return
for any Tax any member of the Partnership Group for which inclusion in such Combined Return is elective; provided, however, that the Partnership Group Combined Tax Liability for any period shall not exceed the aggregate of (x) each such
elective Partnership Group Member’s liability for such Tax for such period, computed as if such Partnership Group Member were not included in such Combined Return and (y) the Partnership Group Combined Tax Liability calculated for the
Partnership Group Members for which inclusion is not elective. Anadarko shall provide pro forma Tax Returns pursuant to Section 3.5 of this Agreement to support the calculation of the amount of any decrease in the Partnership Group Combined Tax
Liability pursuant to this Section 2.1(c). 
 2.2 Franchise Tax Taxable Period. References to “taxable
period” for any franchise or other doing business Tax shall mean the taxable period during which the income, operations, assets or capital comprising the base of such Tax is measured, regardless of whether the right to do business for another
taxable period is obtained by the payment of such franchise Tax. 
 ARTICLE III 

Allocation of Taxes 
 3.1 Liability of the Partnership Group for Combined Taxes. For each Tax for each taxable period that includes or begins on or after the Effective Date and for which a Combined Return is
filed, the Partnership Group Members included in such Combined Return shall be liable to Anadarko for an amount equal to the Partnership Group Combined Tax Liability in respect of such Tax. To the extent that a Partnership Group Member is also
liable to Anadarko pursuant to the WES Tax Sharing Agreement with respect of such Tax, the liability of such Partnership Group Member pursuant to this Agreement shall be reduced by the amount paid to Anadarko by such Partnership Group Member
pursuant to the WES Tax Sharing Agreement with respect of such Tax for such taxable period. 

  
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 3.2 Partnership Group Combined Tax Liability. With respect to each Tax for
each taxable period that includes or begins on or after the Effective Date and for which a member of the Partnership Group is included in a Combined Return, the Partnership Group Combined Tax Liability for such Tax for such taxable period shall be
the Tax for such taxable period as determined on a Partnership Group Pro Forma Combined Return prepared: 
 (a) by including only
the Tax Items of the members of the Partnership Group that are included in the Combined Return and computing the liability of the Partnership Group Members for such Tax as if such Partnership Group Members were included in a separate consolidated or
unitary group; 
 (b) except as provided in Section 3.2(e) hereof, using all elections, accounting methods and conventions
used on the Combined Return for such period; 
 (c) applying the Tax rate in effect for the Combined Return of the Combined Group
for such taxable period; 
 (d) assuming that the Partnership Group elects not to carry back any net operating losses and

 (e) assuming that the Partnership Group’s utilization of any Tax Attribute carryforward or carryback is limited to the
Tax Attributes of the Partnership Group that would be available if the Partnership Group Combined Tax Liability for each taxable period ending after January 1, 2012 were determined in accordance with this Section 3.2. 

3.3 Preparation and Delivery of Pro Forma Tax Returns. Not later than 90 days following the date on which a Combined Return
is filed with the appropriate Tax Authority, Anadarko shall prepare and deliver to the Partnership the related Partnership Group Pro Forma Combined Return calculating the Partnership Group Combined Tax Liability attributable to the period covered by
such filed Combined Return. 
 3.4 Payment of Tax. Anadarko shall timely pay (or shall cause to be timely paid)
any Tax reflected on a Combined Return and hold the Partnership harmless for all liability for such Tax. In the event Anadarko is required to make an estimated payment or deposit of any Tax of any Combined Group which includes any member of the
Partnership Group, Anadarko shall calculate the portion, if any, of such estimated payment or deposit attributable to the Partnership Group using a methodology similar to that described in Section 3.2 (the “Partnership Group
Deposit”) and shall present such calculation to the Partnership. Within 5 days thereafter, the Partnership shall pay the Partnership Group Deposit to Anadarko. Within 30 days after delivery by Anadarko of a Partnership Group Pro Forma
Combined Return to the Partnership calculating the Partnership Group Combined Tax Liability with respect to a Combined Return, the Partnership shall pay to Anadarko such Partnership Group Combined Tax Liability less the amount of any Partnership
Group Deposit relating to the same Combined Return. 
 3.5 Subsequent Changes in Treatment of Tax Items. With
respect to any Combined Return for any taxable period beginning on or after the Effective Date, in the event of a change in the treatment of any Tax Item of any member of a Combined Group as a result of a Final Determination, within 30 days
following such Final Determination (i) Anadarko shall calculate 

  
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the change, if any, to the Partnership Group Combined Tax Liability resulting from such change, (ii) Anadarko shall pay any decrease in the Partnership Group Combined Tax Liability to the
Partnership and (iii) the Partnership shall pay any increase in the Partnership Group Combined Tax Liability to Anadarko. 

ARTICLE IV 

Control of Tax Proceedings; Cooperation and Exchange of Information 

4.1 Control of Proceedings. Except as provided in this Article IV, Anadarko shall have full responsibility and discretion
in handling, settling or contesting any Tax Controversy involving a Tax Return for which it has filing responsibility under this Agreement as well as all Tax Returns for all taxable periods ending before the Effective Date. The Partnership shall
have full responsibility and discretion in handling, settling or contesting any Tax Controversy involving a Tax Return for which it has filing responsibility under this Agreement. Except as otherwise provided in this Article IV, any costs incurred
in handling, settling or contesting any Tax Controversy shall be borne by the Party having full responsibility and discretion thereof. 
 4.2 Cooperation and Exchange of Information. 
 (a) Each Party shall
cooperate fully at such time and to the extent reasonably requested by any other Party in connection with the preparation and filing of any Tax Return or claim for refund, or the conduct of any audit, dispute, proceeding, suit or action concerning
any issues or other matters considered in this Agreement. Such cooperation shall include, without limitation, the following: (i) the retention and provision on demand of Tax Returns, books, records (including those concerning ownership and Tax
basis of property which a Party may possess), documentation or other information relating to the Tax Returns, including accompanying schedules, related workpapers and documents relating to rulings or other determinations by Taxing Authorities, until
the expiration of the applicable statute of limitations (giving effect to any extension, waiver or mitigation thereof); (ii) the provision of additional information, including an explanation of material provided under clause (i) of this
Section 4.2(a), to the extent such information is necessary or reasonably helpful in connection with the foregoing; (iii) the execution of any document that may be necessary or reasonably helpful in connection with the filing of a Tax
Return by Anadarko, the Partnership or of their respective subsidiaries, or in connection with any audit, dispute, proceeding, suit or action and (iv) such Party’s commercially reasonable efforts to obtain any documentation from a
governmental authority or a third party that may be necessary or reasonably helpful in connection with any of the foregoing. 

(b) Each Party shall make its employees and facilities available on a reasonable and mutually convenient basis in connection with any of
the foregoing matters. 
 (c) If any Party fails to provide any information requested pursuant to Section 4.2 hereof within
a reasonable period, as determined in good faith by the Party requesting the information, then the requesting Party shall have the right to engage a public accounting firm to gather such information, provided that 30 days’ prior written notice
is given to the unresponsive Party. If the unresponsive Party fails to provide the requested information within 30 days of receipt of such notice, then such unresponsive Party shall permit the requesting Party’s public

  
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accounting firm full access to all appropriate records or other information as reasonably necessary to comply with this Section 4.2 and shall reimburse the requesting Party or pay directly
all costs connected with the requesting Party’s engagement of the public accounting firm. 
 ARTICLE V 

Warranties and Representations; Payment Obligations 
 5.1 Warranties and Representations Relating to Actions of Anadarko and the Partnership. Each of Anadarko and the Partnership warrants and represents to the other that: 

(a) in the case of Anadarko, it is a corporation duly organized, validly existing and in good standing under the laws of the State of
Delaware and has all requisite power to carry out the transactions contemplated by this Agreement; 
 (b) in the case of the
Partnership, it is a limited partnership duly organized, validly existing and in good standing under the laws of the State of Delaware and has all requisite power to carry out the transactions contemplated by this Agreement; 

(c) it has duly and validly taken all action necessary to authorize the execution, delivery and performance of this Agreement and the
consummation of the transactions contemplated hereby; 
 (d) this Agreement has been duly executed and delivered by it and
constitutes its legal, valid and binding obligation enforceable in accordance with its terms subject, as to the enforcement of remedies, to (i) applicable bankruptcy, reorganization, insolvency, moratorium or other similar laws affecting the
enforcement of creditors’ rights generally from time to time in effect and (ii) general principles of equity, whether enforcement is sought in a proceeding at law or in equity and 

(e) the execution and delivery of this Agreement, the consummation of the transactions contemplated hereby or the compliance with any of
the provisions of this Agreement will not (i) conflict with or result in a breach of any provision of its certificate of incorporation, by-laws, certificate of limited partnership, limited partnership agreement or general partnership agreement,
as the case may be, (ii) breach, violate or result in a default under any of the terms of any agreement or other instrument or obligation to which it is a party or by which it or any of its properties or assets may be bound or
(iii) violate any order, writ, injunction, decree, statute, rule or regulation applicable to it or affecting any of its properties or assets. 
 5.2 Calculation of Payment Obligations. Except as otherwise provided under this Agreement, to the extent that the payor Party has a payment obligation to the payee Party pursuant to this
Agreement, the payee Party shall provide the payor Party with its calculation of the amount of such obligation. The documentation of such calculation shall provide sufficient detail to permit the payor Party to reasonably understand the calculation.
All payment obligations shall be made to the payee Party or to the appropriate Tax Authority as specified by the payee Party within 30 days after delivery by the payee Party to the payor Party of written notice of a payment obligation. Any disputes
with respect to payment obligations shall be resolved in accordance with Section 6.11 below. 

  
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 5.3 Prompt Performance. All actions required to be taken by any Party under
this Agreement shall be performed within the time prescribed for performance in this Agreement or if no period is prescribed, such actions shall be performed promptly. 
 5.4 Interest. Payments pursuant to this Agreement that are not made within the period prescribed therefor in this Agreement shall bear interest (compounded daily) from and including the date
immediately following the last date of such period through and including the date of payment at a rate equal to the U.S. federal short-term rate or rates established pursuant to Section 6621 of the Code for the period during which such payment
is due but unpaid. 
 5.5 Tax Records. The Parties to this Agreement hereby agree to retain and provide on proper
demand by any Tax Authority (subject to any applicable privileges) the books, records, documentation and other information relating to any Tax Return until the later of (i) the expiration of the applicable statute of limitations (giving effect
to any extension, waiver or mitigation thereof), (ii) the date specified in an applicable records retention agreement entered into with a Tax Authority, (iii) a Final Determination made with respect to such Tax Return and (iv) the
final resolution of any claim made under this Agreement for which such information is relevant. 
 5.6 Continuing
Covenants. Each Party agrees (i) not to take any action reasonably expected to result in a new or changed Tax Item that is detrimental to any other Party and (ii) to take any action reasonably requested by any other Party that
would reasonably be expected to result in a new or changed Tax Item that produces a benefit or avoids a detriment to such other Party; provided that such action does not result in any additional cost not fully compensated for by the requesting
Party. The Parties hereby acknowledge that the preceding sentence is not intended to limit, and therefore shall not apply to, the rights of the Parties with respect to matters otherwise covered by this Agreement. 

ARTICLE VI 

Miscellaneous Provisions 
 6.1 Notice. Any notice, demand, claim or other communication required or permitted to be given under this Agreement (a “Notice”) shall be in writing and may be personally
served provided a receipt is obtained therefor, or may be sent by certified mail return receipt requested postage prepaid, to the Parties at the following addresses (or at such other address as one Party may specify by notice to any other Party):

  

			
	Anadarko at:	  	Anadarko Petroleum Corporation
		  	1201 Lake Robbins Drive
		  	The Woodlands, Texas 77380
		  	Attention: General Counsel
		  	Fax: 832-636-3214
		
	Partnership at:	  	Western Gas Equity Partners, LP
		  	c/o Western Gas Equity Holdings, LLC
		  	1201 Lake Robbins Drive
		  	The Woodlands, Texas 77380
		  	Attention: President and Chief Executive Officer
		  	Fax: 832-636-9850

  
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 A Notice which is delivered personally shall be deemed given as of the date specified on the
written receipt therefor. A Notice mailed as provided herein shall be deemed given on the third business day following the date so mailed. Notification of a change of address may be given by any Party to another in the manner provided in this
Section 6.1 for providing a Notice. 
 6.2 Required Payments. Unless otherwise provided in this Agreement,
any payment of Tax required shall be due within 30 days of a Final Determination of the amount of such Tax. 
 6.3
Injunctions. The Parties acknowledge that irreparable damage would occur in the event that any of the provisions of this Agreement were not performed in accordance with its specific terms or were otherwise breached. The Parties hereto shall
be entitled to an injunction or injunctions to prevent breaches of the provisions of this Agreement and to enforce specifically the terms and provisions of this Agreement in any court having jurisdiction, such remedy being in addition to any other
remedy to which they may be entitled at law or in equity. 
 6.4 Further Assurances. Subject to the provisions
hereof, the Parties hereto shall make, execute, acknowledge and deliver such other instruments and documents, and take all such other actions, as may be reasonably required in order to effectuate the purposes of this Agreement and to consummate the
transactions contemplated hereby. Subject to the provisions hereof, each of the Parties shall, in connection with entering into this Agreement, perform its obligations hereunder and take any and all actions relating hereto, comply with all
applicable laws, regulations, orders and decrees, obtain all required consents and approvals and make all required filings with any governmental agency, other regulatory or administrative agency, commission or similar authority and promptly provide
the other Parties with all such information as such Parties may reasonably request in order to be able to comply with the provisions of this sentence. 
 6.5 Parties in Interest. Except as herein otherwise specifically provided, nothing in this Agreement expressed or implied is intended to confer any right or benefit upon any person, firm or
corporation other than the Parties and their respective successors and permitted assigns. 
 6.6 Setoff. Except as
provided by Section 2.1(c) of this Agreement, all payments to be made under this Agreement shall be made without setoff, counterclaim or withholding, all of which are expressly waived. 

6.7 Change of Law. If, due to any change in applicable law or regulations or the interpretation thereof by any court of law
or other governing body having jurisdiction subsequent to the date of this Agreement, performance of any provision of this Agreement or any transaction contemplated hereby shall become impracticable or impossible, the Parties hereto shall use their
best efforts to find and employ an alternative means to achieve the same or substantially the same result as that contemplated by such provision. 

  
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 6.8 Termination and Survival. Notwithstanding anything in this Agreement to
the contrary, this Agreement shall remain in effect and its provisions shall survive for the full period of all applicable statutes of limitation (giving effect to any extension, waiver or mitigation thereof) or until otherwise agreed to in writing
by Anadarko and the Partnership, or their successors. 
 6.9 Amendments; No Waivers. 

(a) Any provision of this Agreement may be amended or waived if, and only if, such amendment or waiver is in writing and signed, in the
case of an amendment, by Anadarko and the Partnership, or in the case of a waiver, by the Party against whom the waiver is to be effective. 
 (b) No failure or delay by any Party in exercising any right, power or privilege hereunder shall operate as a waiver thereof nor shall any single or partial exercise thereof preclude any other or further
exercise thereof or the exercise of any other right, power or privilege. 
 6.10 Governing Law and Interpretation.
This Agreement shall be governed by and construed in accordance with the laws of the State of Delaware applicable to agreements made and to be performed in the State of Delaware. 

6.11 Resolution of Certain Disputes. Any disagreement between the Parties with respect to any matter that is the subject of
this Agreement, including, without limitation, any disagreement with respect to any calculation or other determinations by Anadarko hereunder, which is not resolved by mutual agreement of the Parties, shall be resolved by a nationally recognized
independent accounting firm chosen by and mutually acceptable to the Parties hereto (an “Accounting Referee”). Such Accounting Referee shall be chosen by the Parties within fifteen (15) business days from the date on which one
Party serves written notice on another Party requesting the appointment of an Accounting Referee, provided that such notice specifically describes the calculations to be considered and resolved by the Accounting Referee. In the event the Parties
cannot agree on the selection of an Accounting Referee, then the Accounting Referee shall be any office or branch of the public accounting firm of KPMG LLP. The Accounting Referee shall resolve any such disagreements as specified in the notice
within 30 days of appointment; provided, however, that no Party shall be required to deliver any document or take any other action pursuant to this Section 6.11 if it determines that such action would result in the waiver of any legal privilege
or any detriment to its business. Any resolution of an issue submitted to the Accounting Referee shall be final and binding on the Parties hereto without further recourse. The Parties shall share the costs and fees of the Accounting Referee equally.

 6.12 Confidentiality. Except to the extent required to protect a Party’s interests in a Tax Controversy,
each Party shall hold and shall cause its consultants and advisors to hold in strict confidence, unless compelled to disclose by judicial or administrative process or, in the opinion of its counsel, by other requirements of law, all information
(other than any such information relating solely to the business or affairs of such Party) concerning another Party or its representatives pursuant to this Agreement (except to the extent that such information can be

  
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shown to have been (i) previously known by the Party to which it was furnished, (ii) in the public domain through no fault of such Party or (iii) later lawfully acquired from other
sources by the Party to which it was furnished), and each Party shall not release or disclose such information to any other person, except its auditors, attorneys, financial advisors, bankers and other consultants and advisors who shall be advised
of the provisions of this Agreement. Each Party shall be deemed to have satisfied its obligation to hold confidential information concerning or supplied by another Party if it exercises the same care as it takes to preserve confidentiality for its
own similar information. 
 6.13 Costs, Expenses and Attorneys’ Fees. Except as expressly set forth in this
Agreement, each Party shall bear its own costs and expenses incurred pursuant to this Agreement. In the event a Party to this Agreement brings an action or proceeding for the breach or enforcement of this Agreement, the prevailing party in such
action, proceeding or appeal, whether or not such action, proceeding or appeal proceeds to final judgment, shall be entitled to recover as an element of its costs, and not as damages, such reasonable attorneys’ fees as may be awarded in the
action, proceeding or appeal in addition to whatever other relief the prevailing party may be entitled. For purposes of this Section 6.13, the “prevailing party” shall be the Party who is entitled to recover its costs; a Party not
entitled to recover its costs shall not recover attorneys’ fees. No sum for attorneys’ fees shall be counted in calculating the amount of the judgment for purposes of determining whether a Party is entitled to recover its costs or
attorneys’ fees. 
 6.14 Counterparts. This Agreement may be executed in one or more counterparts, each of
which shall be deemed to be an original, but all of which together shall constitute one and the same instrument. 
 6.15
Severability. The Parties hereby agree that, if any provision of this Agreement should be adjudicated to be invalid or unenforceable, such provision shall be deemed deleted herefrom with respect, and only with respect, to the operation of
such provision in the particular jurisdiction in which such adjudication was made, and only to the extent of the invalidity, and any such invalidity or unenforceability in a particular jurisdiction shall not invalidate or render unenforceable such
provision in any other jurisdiction. All other remaining provisions of this Agreement shall remain in full force and effect for the particular jurisdiction and all other jurisdictions. 

6.16 Entire Agreement. 
 (a) This Agreement contains the entire agreement between the Parties with respect to the subject matter hereof and supersedes all other agreements, whether or not written, in respect of any Tax between
the Anadarko Group and the Partnership Group. 
 (b) In the event of any conflict or inconsistency between the provisions of this
Agreement and the provisions of any other agreement between the Anadarko Group and the Partnership Group, the provisions of this Agreement shall take precedence and to such extent shall be deemed to supersede such conflicting provisions under the
other agreement. 

  
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 6.17 Assignment. This Agreement is being entered into by Anadarko and the
Partnership on behalf of themselves and each member of the Anadarko Group and the Partnership Group. This Agreement shall constitute a direct obligation of each such member and shall be deemed to have been readopted and affirmed on behalf of any
entity that becomes a member of the Anadarko Group or the Partnership Group in the future. Each of Anadarko and the Partnership hereby guarantee the performance of all actions, agreements and obligations provided for under this Agreement of each
member of the Anadarko Group and the Partnership Group, respectively. Each of Anadarko and the Partnership shall, upon the written request of the other, cause any of their respective group members to formally execute this Agreement. This Agreement
shall be binding upon, and shall inure to the benefit of, the successors, assigns and persons controlling any of the entities bound hereby for so long as such successors, assigns or controlling persons are members of the Anadarko Group or the
Partnership Group or their successors and assigns. 
 6.18 Fair Meaning. This Agreement shall be construed in
accordance with its fair meaning and shall not be construed strictly against the drafter. 
 6.19 Titles and
Headings. Titles and headings to sections herein are inserted for the convenience of reference only and are not intended to be a part of or to affect the meaning or interpretation of this Agreement. 

6.20 Construction. In this Agreement, unless the context otherwise requires, the terms “herein,”
“hereof” and “hereunder” refer to this Agreement. 

  
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 IN WITNESS WHEREOF, the Parties hereto have executed and delivered this Agreement as of the
day and year first above written. 
  

			
	ANADARKO PETROLEUM CORPORATION
		
	By:	 	/s/ Robert G. Gwin
	Name:	 	Robert G. Gwin
	Title:	 	Senior Vice President, Finance and Chief Financial Officer
	
	WESTERN GAS EQUITY PARTNERS, LP
		
	By:	 	Western Gas Equity Holdings, LLC, its general partner
		
	By:	 	/s/ Donald R. Sinclair
	Name:	 	Donald R. Sinclair
	Title:	 	President and Chief Executive Officer

 Signature Page to Tax Sharing Agreement

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