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UNDERWRITING AGREEMENT

Underwriting Agreement

UNDERWRITING AGREEMENT | Document Parties: WESTERN GAS PARTNERS LP | Anadarko Gathering Company, LLC | Anadarko Petroleum Corporation | Operating Partnership | Syndicate Department, Citigroup Global Markets Inc | UBS Financial Services, Inc | UBS Securities LLC, Citigroup Global Markets Inc, Credit Suisse Securities (USA) LLC | Western Gas Holdings, LLC | Western Gas Operating, LLC | Western Gas Parties | WESTERN GAS PARTNERS, LP | Western Gas Resources, Inc | WGR Holdings, LLC | WGR Operating, LP You are currently viewing:
This Underwriting Agreement involves

WESTERN GAS PARTNERS LP | Anadarko Gathering Company, LLC | Anadarko Petroleum Corporation | Operating Partnership | Syndicate Department, Citigroup Global Markets Inc | UBS Financial Services, Inc | UBS Securities LLC, Citigroup Global Markets Inc, Credit Suisse Securities (USA) LLC | Western Gas Holdings, LLC | Western Gas Operating, LLC | Western Gas Parties | WESTERN GAS PARTNERS, LP | Western Gas Resources, Inc | WGR Holdings, LLC | WGR Operating, LP

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Title: UNDERWRITING AGREEMENT
Governing Law: New York     Date: 5/14/2008
Law Firm: Vinson Elkins;Andrews Kurth    

UNDERWRITING AGREEMENT, Parties: western gas partners lp , anadarko gathering company  llc , anadarko petroleum corporation , operating partnership , syndicate department  citigroup global markets inc , ubs financial services  inc , ubs securities llc  citigroup global markets inc  credit suisse securities (usa) llc , western gas holdings  llc , western gas operating  llc , western gas parties , western gas partners  lp , western gas resources  inc , wgr holdings  llc , wgr operating  lp
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Execution Copy
WESTERN GAS PARTNERS, LP
18,750,000 Common Units
Representing Limited Partner Interests
Underwriting Agreement
May 8, 2008

 


 
Underwriting Agreement
May 8, 2008
UBS Securities LLC
Citigroup Global Markets Inc.
Credit Suisse Securities (USA) LLC
Morgan Stanley & Co. Incorporated
      as Managing Underwriters
c/o UBS Securities LLC
299 Park Avenue
New York, New York 10171-0026
Ladies and Gentlemen:
     Western Gas Partners, LP, a Delaware limited partnership (the “ Partnership ”), proposes to issue and sell to the underwriters named in Schedule A annexed hereto (the “ Underwriters ”), for whom UBS Securities LLC, Citigroup Global Markets Inc., Credit Suisse Securities (USA) LLC and Morgan Stanley & Co. Incorporated are acting as representatives (the “ Representatives ”), an aggregate of 18,750,000 common units (the “ Firm Units ”) representing limited partner interests in the Partnership (the “ Common Units ”). In addition, the Partnership proposes to grant to the Underwriters the option to purchase up to an additional 2,812,500 Common Units (the “ Additional Units ”), solely for the purpose of covering over-allotments. The Firm Units and the Additional Units are hereinafter collectively referred to as the “ Units .” The Units are described in the Prospectus, which is referred to below.
     This agreement (the “ Agreement ”) is to confirm the agreement among the Partnership, Anadarko Petroleum Corporation, a Delaware corporation (“ Anadarko ”), Western Gas Resources, Inc., a Delaware corporation (“ Western Gas ”), WGR Holdings, LLC, a Delaware limited liability company (“ Holdings ”), and Western Gas Holdings, LLC, a Delaware limited liability company (the “ General Partner ,” and together with the Partnership, Anadarko, Western Gas, and Holdings, the “ Western Gas Parties ”), on the one hand, and the Underwriters on the other hand, concerning the purchase of the Units from the Partnership by the Underwriters.
     The Western Gas Parties, together with Western Gas Operating, LLC, a Delaware limited liability company (“ Operating GP ”), WGR Operating, LP, a Delaware limited partnership (the “ Operating Partnership ”), Anadarko Gathering Company, LLC, a Delaware limited liability company (“ AGC ”), Pinnacle Gas Treating LLC, a Texas limited liability company (“ PGT ”), and MIGC LLC, a Delaware limited liability company (“ MIGC ”), are collectively referred to herein as the “ Western Gas Entities .” Each of Operating GP, the Operating Partnership, AGC, PGT and MIGC is sometimes hereinafter referred to herein as an “ Operating Subsidiary ,” and they are collectively referred to herein as the “ Operating Subsidiaries .” The Western Gas Entities, other than Anadarko and Western Gas, are collectively referred to herein as the “ Partnership Entities .”
     The Partnership hereby acknowledges that, in connection with the proposed offering of the Units (the “ Offering ”), it has requested UBS Financial Services, Inc. (the “ DUP Manager ”) to administer a directed unit program (the “ Directed Unit Program ”), under which up to

 


 
2,812,500 Firm Units, or 15.0% of the Firm Units to be purchased by the Underwriters (the “ Reserved Units ”), shall be reserved for sale by the DUP Manager at the initial public offering price to the officers, directors and employees of the General Partner and its affiliates, including Anadarko, and certain other persons having a relationship with the Partnership, as designated by the Partnership (the “ Directed Unit Participants ”), as part of the distribution of the Units by the Underwriters, subject to the terms of this Agreement, the applicable rules, regulations and interpretations of the Financial Industry Regulatory Authority (“ FINRA ”) and all other applicable laws, rules and regulations. The number of Units available for sale to the general public will be reduced to the extent that Directed Unit Participants purchase Reserved Units. The Underwriters may offer any Reserved Units not purchased by Directed Unit Participants to the general public on the same basis as the other Units being issued and sold hereunder. The Partnership has supplied the DUP Manager with the names, addresses and telephone numbers of the individuals or other entities that the Partnership has designated to be participants in the Directed Unit Program. It is understood that any number of those so designated to participate in the Directed Unit Program may decline to do so.
     The Partnership has prepared and filed, in accordance with the provisions of the Securities Act of 1933, as amended, and the rules and regulations thereunder (collectively, the “ Act ”), with the Securities and Exchange Commission (the “ Commission ”) a registration statement on Form S-1 (File No. 333-146700) under the Act, including a prospectus, relating to the Units. In addition, amendments to such registration statement have been prepared and filed with the Commission in accordance with the Act.
     Except where the context otherwise requires, “ Registration Statement ,” as used herein, means the registration statement on Form S-1 (File No. 333-146700), as amended at the time of such registration statement’s effectiveness for purposes of Section 11 of the Act, as such section applies to the respective Underwriters (the “ Effective Time ”), including (i) all documents filed as a part thereof, (ii) any information contained in a prospectus subsequently filed with the Commission pursuant to Rule 424(b) under the Act and deemed, pursuant to Rule 430A or Rule 430C under the Act, to be part of the registration statement at the Effective Time, and (iii) any additional registration statement filed pursuant to Rule 462(b) under the Act.
     The Partnership has furnished to the Representatives, for use by the Underwriters and by dealers in connection with the Offering, copies of one or more preliminary prospectuses relating to the Units. Except where the context otherwise requires, “ Preliminary Prospectus ,” as used herein, means each such preliminary prospectus, in the form so furnished.
     Except where the context otherwise requires, “ Prospectus ,” as used herein, means the prospectus relating to the Units, filed by the Partnership with the Commission pursuant to Rule 424(b) under the Act on or before the second business day after the date hereof (or such earlier time as may be required under the Act) or, if no such filing is required, the final prospectus included in the Registration Statement at the time it became effective under the Act, in each case in the form furnished by the Partnership to the Representatives for use by the Underwriters and by dealers in connection with the Offering.
     “ Permitted Free Writing Prospectuses ,” as used herein, means each document listed on

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Schedule B-1 attached hereto, each “road show” (as defined in Rule 433 under the Act), if any, related to the Offering contemplated hereby that is a “written communication” (as defined in Rule 405 under the Act) (each such road show, a “ Road Show ”) and any other “free writing prospectus” (as defined in Rule 405 under the Act) to which the Representatives provide their prior consent.
     “ Disclosure Package ,” as used herein, means any Preliminary Prospectus together with any combination of one or more of the Permitted Free Writing Prospectuses, if any, and the information set forth on Schedule B-2 attached hereto.
     As used in this Agreement, “ business day ” shall mean a day on which the New York Stock Exchange (the “ NYSE ”) is open for trading. The terms “herein,” “hereof,” “hereto,” “hereinafter” and similar terms, as used in this Agreement, shall in each case refer to this Agreement as a whole and not to any particular section, paragraph, sentence or other subdivision of this Agreement. The term “or,” as used herein, is not exclusive.
     The Partnership has prepared and filed, in accordance with Section 12 of the Securities Exchange Act of 1934, as amended, and the rules and regulations thereunder (collectively, the “ Exchange Act ”), with the Commission a registration statement on Form 8-A (File No. 001-34046) (as amended, the “ Exchange Act Registration Statement ”) under the Exchange Act to register, under Section 12(b) of the Exchange Act, the class of securities consisting of the Common Units.
     It is understood and agreed to by all parties that the Partnership was recently formed by Holdings and the General Partner to gather, treat and transport natural gas. The Partnership will initially indirectly own AGC, PGT and MIGC. Currently, Anadarko indirectly owns AGC, PGT and MIGC through its indirect ownership of WGR Asset Holding Company LLC (“ Asset Holdco ”). Prior to the date hereof, the following transactions (the “ Formation Transactions ”) occurred:
     1. Western Gas formed Asset Holdco and contributed $1,000 in exchange for all of the membership interests in Asset Holdco;
     2. Asset Holdco formed Holdings and contributed $4,000 in exchange for all of the membership interests in Holdings;
     3. Asset Holdco formed the General Partner and contributed $1,000 in exchange for all of the membership interests in the General Partner;
     4. The General Partner and Asset Holdco formed the Partnership and contributed $60 and $2,940, respectively, in exchange for a 2% general partner interest and a 98% limited partner interest in the Partnership, respectively;
     5. Asset Holdco contributed all of the membership interests in the General Partner and its 98% limited partner interest in the Partnership to Holdings;
     6. The Partnership formed Operating GP and contributed $1,000 in exchange for all

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of the membership interests in Operating GP;
     7. Operating GP and the Partnership formed the Operating Partnership and contributed $0.10 and $999.90, respectively, in exchange for a 0.01% general partner interest and a 99.99% limited partner interest in the Operating Partnership, respectively; and
     8. Asset Holdco distributed all of the membership interests in Holdings to Western Gas.
     It is further understood and agreed by all parties that the following transactions (the “ Offering Transactions ”) will occur substantially contemporaneously with the time of purchase (as defined in Section 2 hereof):
     1. Asset Holdco will distribute all of the membership interests in AGC, PGT and MIGC to Western Gas;
     2. Western Gas will contribute to the General Partner, on behalf of Holdings, a membership interest in AGC with a value equal to 2% of the equity value of the Partnership at the time of purchase (the “ GP Contribution Interest ”);
     3. Western Gas will contribute to Holdings all of the remaining membership interest in AGC and all of the membership interests in PGT and MIGC;
     4. The General Partner will contribute the GP Contribution Interest to the Partnership in exchange for (a) 1,083,115 general partner units representing a continuation of its 2.0% general partner interest in the Partnership and (b) the Incentive Distribution Rights (as defined in the Partnership Agreement, which is defined in Section 3(i) hereof);
     5. Holdings will contribute all of the remaining interest in AGC and all of the interests in PGT and MIGC to the Partnership in exchange for (a) 4,973,806 Common Units, (b) 26,536,306 subordinated units representing limited partner interests in the Partnership (the “ Subordinated Units ”), (c) the right to receive, upon the earlier to occur of the expiration of the Over-Allotment Option period or the exercise in full of the Over-Allotment Option, (1) a number of additional Common Units that is equal to the excess, if any, of (x) 2,812,500 over (y) the aggregate number of Common Units, if any, actually purchased by and issued to the Underwriters pursuant to the exercise of the Over-Allotment Option and (2) a reimbursement of pre-formation capital expenditures in an amount equal to the total amount of cash, if any, contributed by the Underwriters to the Partnership at the additional time(s) of purchase with respect to the Common Units purchased by and issued to the Underwriters pursuant to the exercise of the Over-Allotment Option (if the Over-Allotment Option is not exercised, the Common Units issuable pursuant to the right to receive additional Common Units described in this clause will, together with the Common Units described in clause (a) and the Subordinated Units described in clause (b), represent a 63.4% limited partner interest in the Partnership) and (d) the right to receive a distribution of $14.3 million as a reimbursement for certain pre-formation capital expenditures;

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     6. The Partnership will contribute all of the membership interests in AGC, PGT and MIGC to the Operating Partnership, of which 0.01% of such membership interests will be contributed on behalf of Operating GP;
     7. The public, through the Underwriters, will contribute $309.4 million in cash (the “ Offering Proceeds ”) to the Partnership in exchange for 18,7500,000 Common Units, which will, if the Over-Allotment Option is not exercised, represent a 34.6% limited partner interest in the Partnership;
     8. The Partnership will use the Offering Proceeds to (a) pay the Underwriters’ discounts and a structuring fee totaling approximately $20.1 million, (b) pay approximately $5.0 million of Offering expenses, (c) make a loan of $260.0 million to Anadarko in exchange for a 30-year note bearing interest at a fixed annual rate of 6.5% (the “ Note ”), (d) reimburse Anadarko for $14.3 million of capital expenditures it incurred with respect to the assets contributed to the Partnership and (e) provide $10.0 million for general partnership purposes;
     9. The 98% limited partner interest in the Partnership held by Holdings and the 2% general partner interest in the Partnership held by the General Partner will be redeemed and the initial capital contributions of Asset Holdco and the General Partner will thereupon be refunded, and any interest or other profit that may have resulted from the investment or other use of such capital contributions will be distributed to Holdings and the General Partner in proportion to such capital contributions.
     10. The Partnership will enter into a $30.0 million working capital facility with Anadarko as the lender (the “ Credit Facility ”); and
     11. The agreements of limited partnership and the limited liability company agreements of the Partnership Entities will be amended and restated to the extent necessary to reflect the foregoing transactions and any other transactions contemplated by the Contribution Agreements (as described below).
     If the Underwriters exercise the Over-Allotment Option, the Partnership will use the net proceeds of the sale of Additional Units to reimburse Anadarko for capital expenditures it incurred with respect to the assets contributed to the Partnership during the two-year period prior to the Offering. In connection with the Formation Transactions and the Offering Transactions (collectively, the “ Transactions ”), the parties to the Transactions have entered or will enter into various agreements, assignments, conveyances, contribution agreements and related documents (collectively, the “ Contribution Documents ”). Additionally, the Partnership, the General Partner and Anadarko will enter into an omnibus agreement to be dated as of the Closing Date (the “ Omnibus Agreement ”), the General Partner and Anadarko will enter into a services and secondment agreement to be dated as of the Closing Date (the “ Services Agreement ”) and the General Partner and Andarko will enter into a tax sharing agreement to be dated as of the Closing Date (the “ Tax Sharing Agreement ,” and together with the Contribution Documents, the Omnibus Agreement and the Services Agreement, the “ Transaction Documents ”). The Transaction Documents, the Operating Agreements (as defined below) and the Credit Facility are collectively referred to herein as the “ Operative Documents ”).

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     The Western Gas Parties and the Underwriters agree as follows:
     1.  Sale and Purchase . Upon the basis of the representations and warranties and subject to the terms and conditions set forth herein, the Partnership agrees to issue and sell to the respective Underwriters, the General Partner agrees to cause the Partnership to issue and sell to the respective Underwriters and each of the Underwriters, severally and not jointly, agrees to purchase from the Partnership, the number of Firm Units set forth opposite the name of such Underwriter in Schedule A attached hereto, subject to adjustment in accordance with Section 8 hereof, in each case at a purchase price of $15.51 per Unit. The Partnership is advised by the Representatives that the Underwriters intend (i) to make a public offering of their respective portions of the Firm Units as soon after the effective date of the Registration Statement as in the Representatives’ judgment is advisable and (ii) initially to offer the Firm Units upon the terms set forth in the Prospectus. The Representatives may from time to time increase or decrease the public offering price after the initial public offering to such extent as they may determine.
     In addition, the Partnership hereby grants to the several Underwriters the option (the “ Over-Allotment Option ”) to purchase, and upon the basis of the representations and warranties and subject to the terms and conditions set forth herein, in the event that the Underwriters sell more Common Units in the Offering than the number of Firm Units, the Underwriters shall have the right to purchase, severally and not jointly, from the Partnership, ratably in accordance with the number of Firm Units to be purchased by each of them, all or a portion of the Additional Units at the same purchase price per Unit to be paid by the Underwriters to the Partnership for the Firm Units. The Over-Allotment Option may be exercised by the Representatives on behalf of the several Underwriters at any time and from time to time on or before the thirtieth day following the date of the Prospectus, by written notice to the Partnership. Such notice shall set forth the aggregate number of Additional Units as to which the Over-Allotment Option is being exercised and the date and time when the Additional Units are to be delivered (any such date and time being referred to herein as an “ additional time of purchase ”); provided , however , that no additional time of purchase shall be earlier than the time of purchase (as defined in Section 2 hereof) nor earlier than the second business day after the date on which the Over-Allotment Option shall have been exercised nor later than the tenth business day after the date on which the Over-Allotment Option shall have been exercised. The number of Additional Units to be sold to each Underwriter shall be the number that bears the same proportion to the aggregate number of Additional Units being purchased as the number of Firm Units set forth opposite the name of such Underwriter in Schedule A attached hereto bears to the aggregate number of Firm Units, subject to such adjustments as the Representatives may determine are necessary to eliminate fractional Units and subject to adjustment in accordance with Section 8 hereof.
     2.  Payment and Delivery . Payment of the purchase price for the Firm Units shall be made to the Partnership by Federal Funds wire transfer against electronic delivery of the Firm Units in book entry form to the Representatives through the facilities of The Depository Trust Company (“ DTC ”) for the respective accounts of the Underwriters. Such payment and delivery shall be made at 9:00 A.M., Houston, Texas time, on May 14, 2008 (the “ Closing Date ”) (unless another time shall be agreed to by the Representatives and the Partnership or unless postponed in accordance with the provisions of Section 8 hereof). The time at which such payment and

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delivery are to be made is sometimes referred to herein as the “ time of purchase .” Electronic transfer of the Firm Units shall be made to the Representatives at the time of purchase in such names and in such denominations as they shall specify.
     Payment of the purchase price for the Additional Units shall be made at the additional time of purchase in the same manner as the payment for the Firm Units. Electronic transfer of the Additional Units shall be made to the Representatives at the additional time of purchase in such names and in such denominations as they shall specify.
     Delivery of the documents described in Section 6 hereof with respect to the purchase of the Firm Units and any purchase of Additional Units shall be made at the offices of Andrews Kurth LLP, 600 Travis, Suite 4200, Houston, Texas 77002, at 9:00 A.M., Houston, Texas time, on the Closing Date and the date of the closing of any purchase of Additional Units.
     3.  Representations and Warranties of the Western Gas Parties . Each of the Western Gas Parties, jointly and severally, represents, warrants to and agrees with each of the Underwriters that:
     (a)  Effectiveness of Registration Statement . The Registration Statement has heretofore become effective under the Act or, with respect to any registration statement to be filed to register the offer and sale of Units pursuant to Rule 462(b) under the Act, will be filed with the Commission and become effective under the Act no later than 10:00 P.M., New York City time, on the date of determination of the public offering price for the Units; no stop order of the Commission preventing or suspending the use of any Preliminary Prospectus, the Prospectus or any Permitted Free Writing Prospectus, or the effectiveness of the Registration Statement, has been issued, and no proceedings for such purpose have been instituted or, to the Partnership’s knowledge after due inquiry, are contemplated by the Commission; and the Exchange Act Registration Statement has become effective as provided in Section 12 of the Exchange Act.
     (b)  Compliance with Act; No Material Misstatements or Omissions . The Registration Statement complied when it became effective, complies as of the date hereof and, as amended or supplemented, will comply at the time of purchase, each additional time of purchase, if any, and at all times during which a prospectus is required by the Act to be delivered (whether physically or through compliance with Rule 172 under the Act or any similar rule) in connection with any sale of Units, in all material respects, with the requirements of the Act; the Registration Statement did not, as of the Effective Time, contain an untrue statement of a material fact or omit to state a material fact required to be stated therein or necessary to make the statements therein not misleading; each Preliminary Prospectus complied at the time it was filed with the Commission, and complies as of the date hereof, in all material respects, with the requirements of the Act; at no time during the period that begins on the earlier of the date of such Preliminary Prospectus and the date such Preliminary Prospectus was filed with the Commission and ends at the time of purchase did or will any Preliminary Prospectus, as then amended or supplemented, include an untrue statement of a material fact or omit to state a material fact necessary in order to make the statements therein, in light of the circumstances under which they were made, not misleading, and at no time during such period did or will any

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Preliminary Prospectus, as then amended or supplemented, together with any combination of one or more of the then-issued Permitted Free Writing Prospectuses, if any, include an untrue statement of a material fact or omit to state a material fact necessary in order to make the statements therein, in light of the circumstances under which they were made, not misleading; the Prospectus will comply, as of its date, the date that it is filed with the Commission, the time of purchase, each additional time of purchase, if any, and at all times during which a prospectus is required by the Act to be delivered (whether physically or through compliance with Rule 172 under the Act or any similar rule) in connection with any sale of Units, in all material respects, with the requirements of the Act (including, without limitation, Section 10(a) of the Act); at no time during the period that begins on the earlier of the date of the Prospectus and the date the Prospectus is filed with the Commission and ends at the later of the time of purchase, the latest additional time of purchase, if any, and the end of the period during which a prospectus is required by the Act to be delivered (whether physically or through compliance with Rule 172 under the Act or any similar rule) in connection with any sale of Units did or will the Prospectus, as then amended or supplemented, include an untrue statement of a material fact or omit to state a material fact necessary in order to make the statements therein, in light of the circumstances under which they were made, not misleading; at no time during the period that begins on the date of the earliest use of any Permitted Free Writing Prospectus and ends at the time of purchase did or will any Permitted Free Writing Prospectus include an untrue statement of a material fact or omit to state a material fact necessary in order to make the statements therein, in light of the circumstances under which they were made, not misleading, or conflict with the information contained in the Registration Statement, the Preliminary Prospectuses or the Prospectus; provided , however , that the Western Gas Parties make no representation or warranty in this Section 3(b) with respect to any statement contained in the Registration Statement, any Preliminary Prospectus, the Prospectus or any Permitted Free Writing Prospectus in reliance upon and in conformity with information specified in Section 10 hereof, furnished in writing by or on behalf of any Underwriter through the Representatives to the Partnership expressly for use in the Registration Statement, such Preliminary Prospectus, the Prospectus or such Permitted Free Writing Prospectus. To the extent required by Rule 433(d) under the Act, all Permitted Free Writing Prospectuses were preceded or accompanied by a statutory prospectus meeting the requirements of Section 10 of the Act.
     (c)  No Other Prospectus . Prior to the execution of this Agreement, the Partnership has not, directly or indirectly, offered or sold any Units by means of any “prospectus” (within the meaning of the Act) or used any “prospectus” (within the meaning of the Act) in connection with the offer or sale of the Units, in each case other than the Preliminary Prospectuses and the Permitted Free Writing Prospectuses, if any; the Partnership has not, directly or indirectly, prepared, used or referred to any Permitted Free Writing Prospectus except in compliance with Rules 164 and 433 under the Act; assuming that any such Permitted Free Writing Prospectus is accompanied or preceded by the most recent Preliminary Prospectus that contains a price range or the Prospectus, as the case may be, and that any such Permitted Free Writing Prospectus is so used or referred to after the Registration Statement was filed with the Commission (and after any such Permitted Free Writing Prospectus was, if required pursuant to Rule 433(d) under

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the Act, filed with the Commission), the use of or reference to any such Permitted Free Writing Prospectus by any Underwriter will satisfy the provisions of Rule 164 and Rule 433 (without reliance on subsection (b), (c) or (d) of Rule 164); each of the Preliminary Prospectuses is a prospectus that, other than by reason of Rule 433 or Rule 431 under the Act, satisfies the requirements of Section 10 of the Act, including a price range where required by rule; neither the Partnership nor the Underwriters are disqualified, by reason of subsection (f) or (g) of Rule 164 under the Act, from using, in connection with the offer and sale of the Units, a “free writing prospectus” (as defined in Rule 405 under the Act) pursuant to Rules 164 and 433 under the Act; the Partnership is not an “ineligible issuer” (as defined in Rule 405 under the Act) as of the eligibility determination date for purposes of Rules 164 and 433 under the Act with respect to the Offering contemplated hereby; the parties hereto agree and understand that the content of any and all “road shows” (as defined in Rule 433(h)(4) under the Act) related to the Offering contemplated hereby is solely the property of the Partnership; and the Partnership has caused there to be made available at least one version of a “ bona fide electronic road show” (as defined in Rule 433(h)(5) under the Act) in a manner such that, pursuant to Rule 433(d)(8)(ii) under the Act, the Partnership is not required, pursuant to Rule 433(d) under the Act, to file with the Commission any Road Show.
     (d)  Formation of the Western Gas Entities . Each of the Western Gas Entities has been duly formed and is validly existing as a limited partnership, limited liability company or corporation, as the case may be, and is in good standing under the laws of the State of Delaware or the State of Texas, as the case may be, with full partnership, limited liability company or corporate power and authority to own, lease and operate its properties and conduct its business as described in the Registration Statement, the Preliminary Prospectuses, the Prospectus and each Permitted Free Writing Prospectus and (i) in the case of the Western Gas Parties, to execute and deliver this Agreement and consummate the transactions contemplated hereby, (ii) in the case of the Partnership, to issue, sell and deliver the Units, (iii) in the case of the General Partner, to act as the general partner of the Partnership, and (iv) in the case of each Western Gas Entity that is a party to an Operative Document, to execute and deliver such Operative Document and consummate the transactions contemplated thereby.
     (e)  Foreign Qualification and Registration . Each of the Western Gas Entities is duly qualified to do business as a foreign limited partnership, limited liability company or corporation, as the case may be, and is in good standing in each jurisdiction where the ownership or lease of its properties or the conduct of its business requires such qualification (as set forth in Schedule C hereto), except for any failures to be so qualified and in good standing that would not, individually or in the aggregate, (i) have a material adverse effect on the business, assets, condition (financial or otherwise), results of operations or prospects of the Partnership Entities taken as a whole (a “ Material Adverse Effect ”) or (ii) subject the limited partners of the Partnership to any material liability or disability.
     (f)  Ownership of Western Gas . At the time of purchase and each additional time of purchase, after giving effect to the Transactions, Anadarko will directly and indirectly own all of the issued and outstanding shares of capital stock of Western Gas;

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such shares of capital stock will be duly authorized and validly issued; and Anadarko will own such shares of capital stock free and clear of all claims, liens, encumbrances, security interests, equities and charges (“ Liens ”).
     (g)  Ownership of Holdings . At the time of purchase and each additional time of purchase, after giving effect to the Transactions, Western Gas will own all of the issued and outstanding membership interests in Holdings; such membership interests will be duly authorized and validly issued in accordance with the limited liability company agreement of Holdings, as in effect at each such time (the “ Holdings LLC Agreement ”), fully paid (to the extent required by the Holdings LLC Agreement) and nonassessable (except as such nonassessability may be affected by Section 18-607 of the Delaware Limited Liability Company Act (the “ Delaware LLC Act ”)); and Western Gas will own such membership interests free and clear of all Liens.
     (h)  Ownership of the General Partner . At the time of purchase and each additional time of purchase, after giving effect to the Transactions, Holdings will own all of the issued and outstanding membership interests in the General Partner; such membership interests will be duly authorized and validly issued in accordance with the limited liability company agreement of the General Partner, as in effect at each such time (the “ General Partner LLC Agreement ”), fully paid (to the extent required by the General Partner LLC Agreement) and nonassessable (except as such nonassessability may be affected by Section 18-607 of the Delaware LLC Act); and Holdings will own such membership interests free and clear of all Liens.
     (i)  Ownership of General Partner Interest in the Partnership . At the time of purchase and each additional time of purchase, after giving effect to the Transactions, the General Partner will be the sole general partner of the Partnership, with a 2.0% general partner interest in the Partnership; such general partner interest will be duly authorized and validly issued in accordance with the agreement of limited partnership of the Partnership, as in effect at each such time (the “ Partnership Agreement ”); and the General Partner will own such general partner interest free and clear of all Liens, except for restrictions on transferability contained in the Partnership Agreement and as otherwise described in the Registration Statement (excluding the exhibits thereto), each Preliminary Prospectus and the Prospectus.
     (j)  Ownership of Sponsor Units . At the time of purchase, after giving effect to the Transactions and assuming that the Over-Allotment Option has not been exercised at such time of purchase, there will be 23,723,806 Common Units and 26,536,306 Subordinated Units outstanding; at the time of purchase, after giving effect to the Transactions and assuming that the Over-Allotment Option has not been exercised at such time of purchase, Holdings will own 4,973,806 Common Units, 26,536,306 Subordinated Units and the right to receive additional Common Units in an amount equal to 2,812,500 less the number of Additional Units, if any, purchased by the Underwriters pursuant to the exercise of the Over-Allotment Option (such Common Units and Subordinated Units and any Common Units issuable pursuant to the right to receive additional Common Units described in this clause being collectively referred to herein as the “ Sponsor Units ”); and at the time of purchase and after giving effect to the

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Transactions, the General Partner will own 1,083,115 general partner units and all of the Incentive Distribution Rights (as defined in the Partnership Agreement). On the 31 st day following the date of the Prospectus, there will be 26,536,306 Common Units and 26,536,306 Subordinated Units outstanding; on such day, Holdings will own the number of Common Units equal to 7,786,306 less the number of Additional Units, if any, purchased by the Underwriters pursuant to the exercise of the Over-Allotment Option and 26,536,306 Subordinated Units; and on such day, the General Partner will own 1,083,115 general partner units and all of the Incentive Distribution Rights. All of the Sponsor Units and the limited partner interests represented thereby and the Incentive Distribution Rights will be duly authorized and validly issued in accordance with the Partnership Agreement and will be fully paid (to the extent required by the Partnership Agreement) and nonassessable (except as such nonassessability may be affected by (i) matters described in the Registration Statement, the Preliminary Prospectus and the Prospectus under the caption “Risk Factors—Risks Inherent in an Investment in Us—Your liability may not be limited if a court finds that unitholder action constitutes control of our business,” “Risk Factors—Risks Inherent in an Investment in Us—Unitholders may have liability to repay distributions that were wrongfully distributed to them” and “The Partnership Agreement—Limited Liability” (and any similar information, if any, contained in any Permitted Free Writing Prospectus) and (ii) Sections 17-303 and 17-607 of the Delaware LP Act); and all of the Sponsor Units owned by Holdings and the Incentive Distribution Rights owned by the General Partner will be owned free and clear of all Liens, except with respect to the restrictions on transferability contained in the Partnership Agreement and as otherwise described in the Registration Statement (excluding the exhibits thereto), each Preliminary Prospectus and the Prospectus.
     (k)  Ownership of Operating GP . At the time of purchase and each additional time of purchase, after giving effect to the Transactions, the Partnership will own all of the issued and outstanding membership interests in Operating GP; such membership interests will be duly authorized and validly issued in accordance with the limited liability company agreement of Operating GP, as in effect at each such time (the “ Operating GP LLC Agreement ”), fully paid (to the extent required by the Operating GP LLC Agreement) and nonassessable (except as such nonassessability may be affected by Section 18-607 of the Delaware LLC Act); and the Partnership will own such membership interests free and clear of all Liens.
     (l)  Ownership of the Operating Partnership . At the time of purchase and each additional time of purchase, after giving effect to the Transactions, the Partnership will be the sole limited partner of the Operating Partnership, with a 99.99% limited partner interest in the Operating Partnership; such limited partner interest will be duly authorized and validly issued in accordance with the agreement of limited partnership of the Operating Partnership, as in effect at each such time (the “ Operating Partnership LP Agreement ”), fully paid (to the extent required by the Operating Partnership LP Agreement) and nonassessable (except as such nonassessability may be affected by Sections 17-303 and 17-607 of the Delaware LP Act); and the Partnership will own such limited partner interest free and clear of all Liens. At the time of purchase and each additional time of purchase, after giving effect to the Transactions, Operating GP will be the sole general partner of the Operating Partnership, with 0.01% general partner interest

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in the Operating Partnership; such general partner interest will be duly authorized and validly issued in accordance with the Operating Partnership LP Agreement; and the Partnership will own such general partner interest free and clear of all Liens.
     (m)  Ownership of AGC . At the time of purchase and each additional time of purchase, after giving effect to the Transactions, the Operating Partnership will own all of the issued and outstanding membership interests in AGC; such membership interests will be duly authorized and validly issued in accordance with the limited liability company agreement of AGC, as in effect at each such time (the “ AGC LLC Agreement ”), fully paid (to the extent required by the AGC LLC Agreement) and nonassessable (except as such nonassessability may be affected by Section 18-607 of the Delaware LLC Act); and the Operating Partnership will own such membership interests free and clear of all Liens.
     (n)  Ownership of PGT . At the time of purchase and each additional time of purchase, after giving effect to the Transactions, the Operating Partnership will own all of the issued and outstanding membership interests in PGT; such membership interests will be duly authorized and validly issued in accordance with the limited liability company agreement of PGT, as in effect at each such time (the “ PGT LLC Agreement ”), fully paid (to the extent required by the PGT LLC Agreement) and nonassessable (except as such nonassessability may be affected by 101.206 of the Texas Business Organizations Code (“ TBOC ”)); and the Operating Partnership will own such membership interests free and clear of all Liens.
     (o)  Ownership of MIGC . At the time of purchase and each additional time of purchase, after giving effect to the Transactions, the Operating Partnership will own all of the issued and outstanding membership interests in MIGC; such membership interests will be duly authorized and validly issued in accordance with the limited liability company agreement of MIGC, as in effect at each such time (the “ MIGC LLC Agreement ”), fully paid (to the extent required by the MIGC LLC Agreement) and nonassessable (except as such nonassessability may be affected by Section 18-607 of the Delaware LLC Act); and the Operating Partnership will own such membership interests free and clear of all Liens.
     (p)  No Other Subsidiaries . The Partnership has no other direct or indirect “subsidiaries” (as defined under the Act) other than the Operating Subsidiaries. Other than its ownership interest in the Operating Subsidiaries, the Partnership does not own, and at the time of purchase and each additional time of purchase will not own, directly or indirectly, any shares of stock, any other equity interests or any long-term debt securities of any corporation, partnership, limited liability company, joint venture, association or other entity, other than the Note. All equity interests in the Operating Subsidiaries have been issued in compliance with all applicable securities laws and were not issued in violation of any preemptive right, resale right, right of first refusal or similar right. No options, warrants or other rights to purchase, agreements or other obligations to issue or rights to convert any obligation into equity interests in any of the Operating Subsidiaries are outstanding.
     (q)  Valid Issuance of the Units . At the time of purchase and each additional

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time of purchase, the Units to be sold by the Partnership, and the limited partner interests represented thereby, will be duly authorized in accordance with the Partnership Agreement and, when issued and delivered to the Underwriters against payment therefor as provided herein, will be validly issued, fully paid (to the extent required under the Partnership Agreement) and nonassessable (except as such nonassessability may be affected by (i) matters described in the Registration Statement, the Preliminary Prospectus and the Prospectus under the caption “Risk Factors—Risks Inherent in an Investment in Us—Your liability may not be limited if a court finds that unitholder action constitutes control of our business,” “Risk Factors—Risks Inherent in an Investment in Us—Unitholders may have liability to repay distributions that were wrongfully distributed to them” and “The Partnership Agreement—Limited Liability” (and any similar information, if any, contained in any Permitted Free Writing Prospectus) and (ii) Sections 17-303 and 17-607 of the Delaware LP Act); other than the Sponsor Units and the Incentive Distribution Rights, the Units will be the only limited partner interests of the Partnership issued and outstanding at the time of purchase and each additional time of purchase; and the issuance and delivery of the Units against payment therefore as provided herein will not violate any restriction upon the transfer thereof or any preemptive right, resale right, right of first refusal or similar right pursuant to the Partnership’s certificate of limited partnership, the Partnership Agreement or any agreement or other instrument to which the Partnership, any of the Partnership Entities or any of their affiliates is a party or by which any of them or any of their respective properties may be bound or affected.
     (r)  Conformity of Securities to Description . The Units, when issued and delivered in accordance with the terms of the Partnership Agreement and against payment therefor as provided herein will conform, and the Sponsor Units, the general partner interest and the Incentive Distribution Rights conform, or when issued and delivered in accordance with the terms of the Partnership Agreement will conform, in all material respects to the descriptions thereof, if any, contained in the Registration Statement, the Preliminary Prospectuses, the Prospectus and each Permitted Free Writing Prospectus.
     (s)  Authority and Authorization . The Partnership has all requisite power and authority under the Partnership Agreement and the Delaware LP Act to issue, sell and deliver (i) the Units, in accordance with and upon the terms and conditions set forth in this Agreement, the Partnership Agreement, the Registration Statement, the Preliminary Prospectuses and the Prospectus, and (ii) the Sponsor Units, in accordance with the terms and conditions set forth in the Partnership Agreement and the Transaction Documents. At the time of purchase and each additional time of purchase, all partnership, limited liability company and corporate action, as the case may be, required to be taken by the Western Gas Entities or any of their partners, members or stockholders for the authorization, issuance, sale and delivery of the Units and the Sponsor Units, the consummation of the transactions (including the Transactions) contemplated by this Agreement and the execution and delivery of the Operative Documents shall have been validly taken.
     (t)  Authorization, Execution and Delivery of this Agreement . This Agreement has been duly authorized, executed and delivered by each of the Western Gas Parties.

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     (u)  Authorization, Execution, Delivery and Enforceability of Other Agreements . At or before the time of purchase:
     (i) The Holdings LLC Agreement will be duly authorized, executed and delivered by Western Gas and will be a valid and legally binding agreement of Western Gas, enforceable against Western Gas in accordance with its terms;
     (ii) The General Partner LLC Agreement will be duly authorized, executed and delivered by Holdings and will be a valid and legally binding agreement of Holdings, enforceable against Holdings in accordance with its terms;
     (iii) The Partnership Agreement will be duly authorized, executed and delivered by the General Partner and Holdings and will be a valid and legally binding agreement of the General Partner and Holdings, enforceable against both of them in accordance with its terms;
     (iv) The Operating GP LLC Agreement will be duly authorized, executed and delivered by the Partnership and will be a valid and legally binding agreement of the Partnership, enforceable against the Partnership in accordance with its terms;
     (v) The Operating Partnership LP Agreement will be duly authorized, executed and delivered by the Partnership and Operating GP and will be a valid and legally binding agreement of the Partnership and Operating GP, enforceable against both of them in accordance with its terms;
     (vi) The AGC LLC Agreement will be duly authorized, executed and delivered by the Operating Partnership and will be a valid and legally binding agreement of the Operating Partnership, enforceable against the Operating Partnership in accordance with its terms;
     (vii) The MIGC LLC Agreement will be duly authorized, executed and delivered by the Operating Partnership and will be a valid and legally binding agreement of the Operating Partnership, enforceable against the Operating Partnership in accordance with its terms;
     (viii) The PGT LLC Agreement (together with the Holdings LLC Agreement, the General Partner LLC Agreement, the Partnership Agreement, the Operating GP LLC Agreement, the Operating Partnership LP Agreement, the AGC LLC Agreement and the MIGC LLC Agreement, the “ Operating Agreements ”) will be duly authorized, executed and delivered by the Operating Partnership and will be a valid and legally binding agreement of the Operating Partnership, enforceable against the Operating Partnership in accordance with its terms;
     (ix) Each of the Contribution Documents will be duly authorized, executed and delivered by the parties thereto and will be a valid and legally

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binding agreement of each of the parties thereto, enforceable against each of such parties in accordance with its terms;
     (x) The Omnibus Agreement will be duly authorized, executed and delivered by the Partnership, the General Partner and Anadarko and will be a valid and legally binding agreement of each of them, enforceable against each of them in accordance with its terms;
     (xi) The Services Agreement will be duly authorized, executed and delivered by the General Partner and Anadarko and will be a valid and legally binding agreement of both of them, enforceable against both of them in accordance with its terms;
     (xii) The Tax Sharing Agreement will be duly authorized, executed and delivered by the General Partner and Anadarko and will be a valid and legally binding agreement of both of them, enforceable against both of them in accordance with its terms;
     (xiii) The Credit Facility will be duly authorized, executed and delivered by the Partnership and Anadarko and will be a valid and legally binding agreement of both of them, enforceable against both of them in accordance with its terms;
provided that, with respect to each agreement described in this Section 3(u) , the enforceability thereof may be limited by (A) bankruptcy, insolvency, fraudulent transfer, reorganization, moratorium and similar laws relating to or affecting creditors’ rights generally and by general principles of equity (regardless of whether such enforceability is considered in a proceeding in equity or at law); and (B) public policy, applicable laws relating to fiduciary duties and indemnification and an implied covenant of good faith and fair dealing.
     (v)  No Defaults . No Western Gas Entity is in breach or violation of or in default under (nor has any event occurred which, with notice, lapse of time or both, would result in any breach or violation of, constitute a default under or give the holder of any indebtedness (or a person acting on such holder’s behalf) the right to require the repurchase, redemption or repayment of all or a part of such indebtedness under) (i) its formation, governing or other organizational documents, (ii) any indenture, mortgage, deed of trust, bank loan, credit agreement or other evidence of indebtedness, or any license, lease, contract or other agreement or instrument to which it is a party or by which it or any of its properties may be bound or affected, (iii) any federal, state, local or foreign law, regulation or rule, (iv) any rule or regulation of any self-regulatory organization or other non-governmental regulatory authority (including, without limitation, the rules and regulations of the NYSE), or (v) any decree, judgment or order applicable to it or any of its properties, except in the case of clauses (ii) through (v) for any such breaches, violations or default that would not, individually or in the aggregate, have a Material Adverse Effect, affect the validity of the Units or prevent or materially interfere with the consummation of the transactions contemplated by this Agreement,

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including the Offering, and the other transactions (including, but not limited to, the Transactions) contemplated by the Registration Statement, the Preliminary Prospectuses, the Prospectus, any Permitted Free Writing Prospectus and the Operative Documents.
     (w)  No Conflicts . The execution, delivery and performance of this Agreement and the Operative Documents, the issuance and sale of the Units and the consummation of the transactions contemplated hereby and thereby (including, without limitation, the Transactions) will not conflict with, result in any breach or violation of, constitute a default under (or constitute any event which, with notice, lapse of time or both, would result in any breach or violation of, constitute a default under or give the holder of any indebtedness (or a person acting on such holder’s behalf) the right to require the repurchase, redemption or repayment of all or a part of such indebtedness under), or result in the creation or imposition of a Lien on any property or assets of any Western Gas Entity pursuant to (i) the formation, governing or other organizational documents of any of the Western Gas Entities, (ii) any indenture, mortgage, deed of trust, bank loan, credit agreement or other evidence of indebtedness, or any license, lease, contract or other agreement or instrument to which any of the Western Gas Entities is a party or by which any of the Western Gas Entities or any of their respective properties may be bound or affected, (iii) any federal, state, local or foreign law, regulation or rule, (iv) any rule or regulation of any self-regulatory organization or other non-governmental regulatory authority (including, without limitation, the rules and regulations of the NYSE), or (v) any decree, judgment or order applicable to any of the Western Gas Entities or any of their respective properties, except in the cases of clauses (ii) through (v) for any such conflicts, breaches, violations or defaults that would not, individually or in the aggregate, have a Material Adverse Effect, affect the validity of the Units or prevent or materially interfere with the consummation of the transactions contemplated by this Agreement, including the Offering, and the other transactions (including, but not limited to, the Transactions) contemplated by the Registration Statement, the Preliminary Prospectuses, the Prospectus, any Permitted Free Writing Prospectus and the Operative Documents.
     (x)  No Consents . No approval, authorization, consent or order of or filing with any federal, state, local or foreign governmental or regulatory commission, board, body, authority or agency, or of or with any self-regulatory organization or other non-governmental regulatory authority (including, without limitation, the NYSE), or approval of the security holders of the Western Gas Entities (each, a “ Consent ”), is required in connection with the issuance and sale of the Units, the execution, delivery and performance of the Operative Documents by the Western Gas Entities or the consummation by the Western Gas Entities of the transactions contemplated hereby or thereby (including, without limitation, the Transactions), other than (i) registration of the Units under the Act, which has been effected (or, with respect to any registration statement to be filed hereunder pursuant to Rule 462(b) under the Act, will be effected in accordance herewith), (ii) any necessary qualification under the securities or blue sky laws of the various jurisdictions in which the Units are being offered by the Underwriters, (iii) under the rules and regulations of FINRA and (iv) Consents that have been, or prior to the Closing Date will be, obtained.
     (y)  No Preemptive Rights, Registration Rights, Options or Other Rights .

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Except as described in the Registration Statement (excluding the exhibits thereto), each Preliminary Prospectus and the Prospectus, (i) no person has the right, contractual or otherwise, to cause the Partnership to issue or sell to it any Units or other equity interests of the Partnership, (ii) no person has any preemptive rights, resale rights, rights of first refusal or other rights to purchase any Units or other equity interests in the Partnership, (iii) no person has any resale rights in respect of any Units or other equity interests in the Partnership that would be required to be disclosed in the Registration Statement and are not so disclosed, (iv) no person has the right to act as an underwriter or as a financial advisor to the Partnership in connection with the Offering and (v) no person has the right, contractual or otherwise, to cause the Partnership to register under the Act any Units or other equity interests in the Partnership, or to include any Units or other equity interests in the Partnership in the Registration Statement or the Offering contemplated thereby.
     (z)  Permits . Each of the Partnership Entities has all necessary licenses, authorizations, consents and approvals (each, a “ Permit ”) and has made all necessary filings required under any applicable law, regulation or rule, and has obtained all necessary Permits from other persons, in order to conduct its business, except for such Permits that, if not obtained, would not, individually or in the aggregate, result in a Material Adverse Effect; and no Partnership Entity is in violation of or default under, or has received notice of any proceedings relating to the revocation or modification of, any such Permit or any federal, state, local or foreign law, regulation or rule or any decree, order or judgment applicable to such Partnership Entity, except for any such violations, defaults, revocations or modifications that would not, individually or in the aggregate, have a Material Adverse Effect.
     (aa)  Disclosure of Certain Items . All legal or governmental proceedings, affiliate transactions, off-balance sheet transactions, contracts, licenses, agreements, properties, leases or documents of a character required to be described in the Registration Statement, the Preliminary Prospectuses or the Prospectus or to be filed as an exhibit to the Registration Statement have been so described or filed as required; and the statements included in the Registration Statement, the Preliminary Prospectuses and the Prospectus under the headings “Our Cash Distribution Policy and Restrictions on Distributions,” “Provisions of our Partnership Agreement Relating to Cash Distributions,” “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Liquidity and Capital Resources,” “Business—Safety and Maintenance,” “Business—Regulation of Operations,” “Business—Environmental Matters,” “Business—Title to Properties and Rights of Way,” “Management,” “Certain Relationships and Related Party Transactions,” “Conflicts of Interest and Fiduciary Duties,” “Description of the Common Units,” “The Partnership Agreement,” “Material Tax Consequences” and “Underwriting” (and any similar information contained in each Permitted Free Writing Prospectus), insofar as they purport to summarize legal or governmental matters or proceedings or the terms of statutes, rules, regulations, agreements or documents, are fair and accurate summaries of such legal or governmental matters or proceedings, statutes, rules, regulations, agreements or documents.
     (bb)  Litigation . Except as described in the Registration Statement (excluding the exhibits thereto), each Preliminary Prospectus and the Prospectus, there are no

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actions, suits, claims, investigations or proceedings pending or, to the Western Gas Parties’ knowledge, threatened or contemplated to which the Western Gas Entities or any of their respective directors or officers is or would be a party or to which any of their respective properties is or would be subject at law or in equity, before or by any federal, state, local or foreign governmental or regulatory commission, board, body, authority or agency, or before or by any self-regulatory organization or other non-governmental regulatory authority (including, without limitation, the NYSE), except for any such actions, suits, claims, investigations or proceedings that would not, individually or in the aggregate, if resolved adversely to any Western Gas Entity, have a Material Adverse Effect, affect the validity of the Units or prevent or materially interfere with consummation of the transactions contemplated by this Agreement, including the Offering, and the other transactions (including, but not limited to, the Transactions) contemplated by the Registration Statement, the Preliminary Prospectuses, the Prospectus, any Permitted Free Writing Prospectus and the Operative Documents.
     (cc)  Independent Registered Public Accounting Firm . KPMG LLP, whose reports on the financial statements of certain of the Partnership Entities and the combined financial statements of Western Gas Partners Predecessor (as defined in such financial statements) are included in the Registration Statement, the Preliminary Prospectuses, the Prospectus and each Permitted Free Writing Prospectus containing an audit report, are independent registered public accountants as required by the Act and by the rules of the Public Company Accounting Oversight Board.
     (dd)  Financial Statements . The financial statements included in the Registration Statement, the Preliminary Prospectuses, the Prospectus and, if any, each Permitted Free Writing Prospectuses, together with the related notes and schedules, present fairly in all material respects the financial position of the Partnership, the General Partner, MIGC and Western Gas Partners Predecessor as of the dates indicated and the results of operations, cash flows and changes in parents’, partners’ or members’ equity, as the case may be, of the Partnership, the General Partner, MIGC and Western Gas Partners Predecessor for the periods specified; such financial statements have been prepared in compliance with the requirements of the Act and Exchange Act and in conformity with U.S. generally accepted accounting principles applied on a consistent basis during the periods involved; all pro forma financial statements or data included in the Registration Statement, the Preliminary Prospectuses, the Prospectus and each Permitted Free Writing Prospectus (excluding the pro forma information and assumptions set forth under the caption “Our Cash Distribution Policy and Restrictions on Distributions—Unaudited Pro Forma Available Cash for the Year Ended December 31, 2007” and in the related notes) comply with the requirements of the Act (including, without limitation, Regulations S-X and G under the Act), the Exchange Act, Item 10 under Regulation S-K and Financial Interpretation No. 46, and the assumptions used in the preparation of such pro forma financial statements and data are reasonable, the pro forma adjustments used therein are appropriate to give effect to the transactions or circumstances described therein and the pro forma adjustments have been properly applied to the historical amounts in the compilation of those statements and data; all other financial and statistical data contained in the Registration Statement, the Preliminary Prospectuses, the Prospectus and each Permitted Free Writing Prospectus are accurately and fairly presented and prepared on a

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basis consistent with the financial statements and books and records of the Western Gas Entities; the assumptions and forecasts underlying the pro forma information set forth under the captions “Our Cash Distribution Policy and Restrictions on Distributions—Partnership Statement of Estimated Adjusted EBITDA” and “Our Cash Distribution Policy and Restrictions on Distributions—Unaudited Pro Forma Available Cash for the Year Ended December 31, 2007” and in the related notes in the Registration Statement, the Preliminary Prospectuses and the Prospectus (and any similar information, if any, contained in any Permitted Free Writing Prospectus) are, in the informed judgment of management of the Partnership Entities, reasonable, and with respect to the pro forma information set forth under the caption “Our Cash Distribution Policy and Restrictions on Distributions—Unaudited Pro Forma Available Cash for the Year Ended December 31, 2007” and in the related notes, the pro forma adjustments used therein are appropriate to give effect to the transactions or circumstances described therein and the pro forma adjustments have been properly applied to the historical amounts in the compilation of those statements and data; there are no financial statements (historical or pro forma) that are required to be included in the Registration Statement, any Preliminary Prospectus or the Prospectus that are not so included as required; the Partnership Entities do not have any material liabilities or obligations, direct or contingent (including any off-balance sheet obligations), not described in the Registration Statement (excluding the exhibits thereto), each Preliminary Prospectus and the Prospectus; and all disclosures contained in the Registration Statement, the Preliminary Prospectuses, the Prospectus and each Permitted Free Writing Prospectus regarding “non-GAAP financial measures” (as such term is defined by the rules and regulations of the Commission) comply with Regulation G and Item 10 of Regulation S-K under the Act, to the extent applicable.
     (ee)  No Material Adverse Change . Subsequent to the respective dates as of which information is given in the Registration Statement, the Preliminary Prospectuses, the Prospectus and each Permitted Free Writing Prospectus, in each case excluding any amendments or supplements to the foregoing made after the execution of this Agreement, except as described in the Registration Statement (excluding the exhibits thereto), each Preliminary Prospectus and the Prospectus, there has not been (i) any material adverse change, or any developments that are reasonably likely to result in, individually or in the aggregate, a material adverse change, in the business, assets, management, condition (financial or otherwise), prospects or results of operations of the Partnership Entities (taken as a whole), (ii) any transaction that is material to the Partnership Entities (taken as a whole), (iii) any obligation or liability, direct or contingent (including any off-balance sheet obligations), incurred by any Partnership Entity that is material to the Partnership Entities (taken as a whole), (iv) any material change in the capitalization, ownership or outstanding indebtedness of any Partnership Entity or (v) any dividend or distribution of any kind declared, paid or made on the security interests of any Partnership Entity.
     (ff)  Lock-Up Agreement . The Partnership has obtained for the benefit of the Underwriters the agreement (a “ Lock-Up Agreement ”), in the form set forth as Exhibit A hereto, of (i) each director and “officer” (within the meaning of Rule 16a-1(f) under the Exchange Act) of the General Partner, (ii) each Directed Unit Participant who purchases in excess of $100,000 worth of Reserved Units pursuant to the Directed Unit Program, (iii) each holder of Sponsor Units and (iv) each other holder of Common Units named in Exhibit A-1 hereto.

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     (gg)  Investment Company . None of the Partnership Entities is, at no time during which a prospectus is required by the Act to be delivered (whether physically or through compliance with Rule 172 under the Act or any similar rule) in connection with any sale of Units will any of them be, nor, after giving effect to the Offering and sale of the Units and the application of the proceeds therefrom, will any of them be, an “investment company” or an entity “controlled” by an “investment company,” as such terms are defined in the Investment Company Act of 1940, as amended (the “ Investment Company Act ”).
     (hh)  Title to Properties . The Partnership Entities have good and marketable title to all real property and good title to all personal property described in the Registration Statement, the Preliminary Prospectuses, the Prospectus and each Permitted Free Writing Prospectus as being owned by any of them, free and clear of all Liens, except for Liens that would not materially interfere with the use of any such property for the conduct of their businesses and Liens described in the Registration Statement (excluding the exhibits thereto), each Preliminary Prospectus and the Prospectus. All property described in the Registration Statement, the Preliminary Prospectuses, the Prospectus and each Permitted Free Writing Prospectus as being held under lease by any Partnership Entity is held thereby under valid, subsisting and enforceable leases.
     (ii)  Rights-of-Way . Each Partnership Entity has such consents, easements, rights-of-way or licenses from any person (“ rights-of-way ”) as are necessary to enable it to conduct its business in the manner described in the Registration Statement, the Preliminary Prospectuses, the Prospectus and each Permitted Free Writing Prospectus, subject to such qualifications as may be set forth in the Registration Statement, each such Preliminary Prospectus, the Prospectus or each such Permitted Free Writing Prospectus, except for (i) qualifications, reservations and encumbrances that would not, individually or in the aggregate, have a Material Adverse Effect and (ii) such rights-of-way that, if not obtained, would not result in, individually or in the aggregate, a Material Adverse Effect; and, except as described in the Registration Statement (excluding the exhibits thereto), each Preliminary Prospectus and the Prospectus or as would not interfere with the operations of the Partnership Entities as conducted on the date hereof to such a material extent that the Representatives could reasonably conclude that proceeding with the Offering would be inadvisable, none of such rights-of-way contains any restriction that is materially burdensome to the Partnership Entities, taken as a whole.
     (jj)  Intellectual Property . The Partnership Entities own, or have obtained valid and enforceable licenses for or other rights to use, the inventions, patent applications, patents, trademarks (both registered and unregistered), tradenames, service names, copyrights, trade secrets and other proprietary information (collectively, “ Intellectual Property ”) described in the Registration Statement, the Preliminary Prospectuses, the Prospectus and, if any, each Permitted Free Writing Prospectus as being owned or licensed by them or that are necessary for the conduct of their respective businesses as currently conducted or as proposed to be conducted, except for any failures to own, license or have rights to such Intellectual Property that would not, individually or

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in the aggregate, have a Material Adverse Effect. The Western Gas Parties are unaware of any claim to the contrary or any challenge by any other person to the rights of any of the Partnership Entities with respect to any Intellectual Property. No Partnership Entity has infringed or is infringing the intellectual property of a third party or has received notice of a claim by a third party to the contrary.
     (kk)  Labor and Employment Matters . No Partnership Entity is engaged in any unfair labor practice, and no labor disputes with the employees of or to be seconded to any Partnership Entity exist or, to the knowledge of the Western Gas Parties after due inquiry, are imminent or threatened that would, individually or in the aggregate, have a Material Adverse Effect. To the knowledge of the Western Gas Parties: (i) there is (A) no unfair labor practice complaint pending or threatened against any Partnership Entity before the National Labor Relations Board, and no grievance or arbitration proceeding arising out of or under collective bargaining agreements pending or threatened, (B) no strike, labor dispute, slowdown or stoppage pending or threatened against any Partnership Entity and (C) no union representation dispute currently existing concerning the employees of or to be seconded to any Partnership Entity, (ii) no union organizing activities are currently taking place concerning the employees of or to be seconded to any Partnership Entity and (iii) there has been no violation of any federal, state, local or foreign law relating to discrimination in the hiring, promotion or pay of employees, any applicable wage or hour laws or any provision of the Employee Retirement Income Security Act of 1974, as amended (“ ERISA ”), or the rules and regulations promulgated thereunder concerning the employees of or to be seconded to any Partnership Entity.
     (ll)  Environmental Compliance . Except as described in the Registration Statement (excluding the exhibits thereto), each Preliminary Prospectus and the Prospectus, (i) each Partnership Entity and each of the properties, assets and operations of the Partnership Entities is in compliance with any and all applicable federal, state, local or foreign laws, statutes, ordinances, rules, regulations, orders, decrees, judgments, injunctions, permits, licenses, authorizations or other binding requirements, or common laws, relating to health, safety or the protection, cleanup or restoration of the environment or natural resources, including those relating to the distribution, processing, generation, treatment, storage, disposal, transportation, other handling or release or threatened release of Hazardous Materials (as defined below) (“ Environmental Laws ”), (ii) each Partnership Entity has received and is in compliance with all permits, licenses, authorizations or other approvals required under applicable Environmental Laws to conduct its business as it is currently being conducted, (iii) no Western Gas Entity has received written notice of any, and to the knowledge of the Western Gas Parties, after reasonable inquiry, there are no events, conditions or activities that could reasonably be expected to form the basis for any, actual or potential liability for the investigation or remediation of any disposal or release of hazardous or toxic substances or wastes, pollutants or contaminants, and (iv) no Western Gas Entity is subject to any pending or, to the knowledge of the Western Gas Parties, threatened actions, suits, demands, orders or proceedings against any Partnership Entity relating to any Environmental Laws (collectively, “ Proceedings ”), except for any (A) failures to comply with Environmental Laws or to receive or comply with required permits, licenses, authorizations or other approvals, (B) actual or potential liabilities or (C) Proceedings that would not, individually or in the aggregate, have a Material Adverse

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Effect. Except as described in the Registration Statement (excluding the exhibits thereto), each Preliminary Prospectus and the Prospectus, no Partnership Entity has entered into any agreement relating to any alleged violation of any Environmental Law or any actual or alleged release or threatened release or cleanup at any location of any Hazardous Materials (as defined below). Except as described in

 
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