Document:

EX-10.1

 Exhibit 10.1 

Execution Version 

WILLIAMS PARTNERS L.P. 

289,277,117 Common Units 

Representing Limited Partner Interests 

Common Unit Issuance Agreement 

January 9, 2017 
 WPZ GP LLC 

One Williams Center 
 Tulsa, Oklahoma 74172-0172 

Attention: Donald R. Chappel 
 Reference is made
to the Partnership’s First Amended and Restated Agreement of Limited Partnership, dated as of August 3, 2010, as amended (the “Partnership Agreement”). Williams Partners L.P., a Delaware limited partnership (the
“Partnership”), proposes, upon the terms stated herein, to (a) issue 289,000,000 common units (the “WPZ Interest Restructuring Common Units”) representing limited partner interests in the Partnership (the
“Common Units”) to WPZ GP LLC, a Delaware limited liability company and the general partner of the Partnership (the “General Partner”), in consideration for (i) the General Partner’s permanent waiver of
any and all obligations of the Partnership and rights of the General Partner and its Affiliates under the Partnership Agreement with respect to the Incentive Distribution Rights (as defined in the Partnership Agreement and as referred to herein as
the “IDRs”) (the “IDR Waiver”) and (ii) the conversion of the General Partner Interest (as defined in the Partnership Agreement) into a non-economic general partner
interest in the Partnership (the “Non-Economic WPZ General Partner Interest”) (such conversion and issuance, together, the “WPZ General Partner Interest Recapitalization”) and
(b) issue 277,117 Common Units (the “Cash Purchase Common Units”) to the General Partner in exchange for the General Partner’s contribution to the Partnership of cash in an amount equal to $10,000,000 (the “Cash
Purchase Common Unit Purchase Price” and such issuance, together with the IDR Waiver and the WPZ General Partner Interest Recapitalization, the “WPZ Interest Restructuring”). The IDR Waiver and the WPZ General Partner
Interest Recapitalization will be effected pursuant to Amendment No. 8 to the Partnership Agreement, attached hereto as Exhibit I, to be dated as of the date hereof (the “Partnership Agreement Amendment”). 

This is to confirm the agreement between the Partnership and the General Partner concerning the WPZ Interest Restructuring. Capitalized terms
used but not defined herein will have the meanings given to them in the Partnership Agreement. 
 1. Representations, Warranties and
Agreements. 
 (a) The Partnership represents and warrants to, and agrees with, the General Partner that: 

(i) The Partnership has been duly formed and is validly existing in good standing as a limited partnership under the Delaware Revised Uniform
Limited Partnership Act (the “Delaware Act”) with full limited partnership power and authority necessary to enter into, execute and deliver this Agreement. 

 (ii) As of the Closing Date (as defined in Section 4), the WPZ Interest Restructuring
Common Units and the Cash Purchase Common Units will be duly authorized and, when issued and delivered to the General Partner in accordance with the terms hereof, will be validly issued, fully paid (to the extent required by the Partnership
Agreement), and non-assessable (except as such non-assessability may be affected by Sections 17-303, 17-607 and 17-804 of the Delaware Act). 
 (iii) The Partnership has all requisite limited partnership power and
authority to issue and deliver the WPZ Interest Restructuring Common Units and the Cash Purchase Common Units in accordance with and upon the terms set forth in this Agreement and the Partnership Agreement and to perform its obligations under this
Agreement. 
 (iv) This Agreement has been duly executed and delivered by the Partnership and, assuming its due execution and delivery by
the General Partner, this Agreement constitutes a legal, valid and binding obligation of the Partnership, enforceable against it in accordance with its terms, except as such enforceability may be limited by applicable bankruptcy, insolvency,
fraudulent transfer, reorganization, moratorium and similar Laws (as defined below) relating to or affecting creditors’ rights generally and to legal principles of general applicability governing the availability of equitable remedies,
including principles of good faith and fair dealing (regardless of whether such enforceability is considered in a proceeding in equity or at law) (collectively, “Enforceability Exceptions”). 

(v) The execution, delivery and performance of this Agreement and the consummation of the transactions contemplated by this Agreement
(collectively, the “Transactions”), including each of the transactions contemplated by Section 2, do not and will not (i) constitute a breach or violation of, or result in a default (or an event that, with notice or
lapse of time or both, would become a default) under, or result in the termination or in a right of termination or cancellation of, or accelerate the performance required by, any note, bond, mortgage, indenture, deed of trust, license, franchise,
lease, contract, agreement, joint venture or other instrument or obligation to which the Partnership or any of its Subsidiaries is a party or by which the Partnership or any of its Subsidiaries or properties is subject or bound that is material to
the Partnership and its Subsidiaries, taken as a whole, (ii) constitute a breach or violation of, or a default under the Partnership Agreement, (iii) contravene or conflict with or constitute a violation of any provision of any law
(statutory, common, or otherwise), constitution, treaty, convention, ordinance, equitable principle, code, rule, regulation, order, writ, injunction, decree, or ruling (“Law”) binding upon or applicable to the Partnership or any of
its Subsidiaries, or (iv) result in the creation of any liens or other encumbrances on any of the Partnership’s (or any of its Subsidiaries’) assets. 

(vi) Except for the fees payable by the Partnership to Evercore Group L.L.C., no action has been taken by or on behalf of the Partnership that
would give rise to any valid claim against any party hereto for a brokerage commission, finder’s fee or other like payment with respect to the matters contemplated hereby. 

  
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 (vii) Subject to required filings under federal and state securities Laws and compliance with the
rules and regulations of the New York Stock Exchange (the “NYSE”), neither the execution and delivery by the Partnership of this Agreement nor the consummation by the Partnership of the transactions contemplated hereby do or will
require any registrations, qualifications, designations, declarations or filings with, or the obtaining of any permit, authorization, consent, waiver or approval of, or the giving of any notice to, in each case, any governmental authority, third
party or other person. 
 (viii) Assuming the accuracy of the representations and warranties of the Investor contained in this Agreement,
the Partnership is not required to register the WPZ Interest Restructuring Common Units or the Cash Purchase Common Units under the Securities Act in connection with the issuance of the WPZ Interest Restructuring Common Units and the Cash Purchase
Common Units to the General Partner. 
 (b) The General Partner represents and warrants to, and agrees with, the Partnership that: 

(i) The General Partner has been duly formed and is validly existing in good standing as a limited liability company under the Laws of its
jurisdiction of formation, with all limited liability company power and authority necessary to own or hold its properties and conduct the business in which it is engaged, in each case in all material respects. 

(ii) The General Partner is an “accredited investor,” as such term is defined in Rule 501(a) of Regulation D promulgated under
the Securities Act of 1933, as amended (the “Securities Act”), and the investment by the General Partner in the Partnership is for its own account and not for the account of others, for investment purposes. The WPZ Interest Restructuring
Common Units and the Cash Purchase Common Units are being acquired for investment and with no intention of distributing or reselling such WPZ Interest Restructuring Common Units or the Cash Purchase Common Units or any portion thereof or interest
therein in any transaction which would be a violation of the securities Laws of the United States of America or any state or foreign country or jurisdiction. 

(iii) The General Partner has been given reasonable access to full and fair disclosure of all material information regarding the Partnership,
the WPZ Interest Restructuring Common Units, and the Cash Purchase Common Units, including reasonable access to the books and records of the Partnership. The General Partner acknowledges and agrees that it has been provided, to its full
satisfaction, with the opportunity to ask questions concerning the terms and conditions of an investment in the Partnership and has knowingly and voluntarily elected instead to rely solely on its own investigation. 

(iv) The General Partner understands that the WPZ Interest Restructuring Common Units and the Cash Purchase Common Units are “restricted
securities” and have not been registered under the Securities Act or any applicable state securities Laws. The General Partner acknowledges that the WPZ Interest Restructuring Common Units and the Cash Purchase Common Units will bear a
restrictive legend to that effect. The General Partner acknowledges and agrees that it must bear the economic risk of this investment indefinitely, that the WPZ Interest Restructuring Common Units and the Cash Purchase Common Units issued to the

  
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General Partner hereunder may not be sold or transferred or offered for sale or transfer by it without registration under the Securities Act and any applicable state securities or Blue Sky Laws
or the availability of exemptions therefrom, and that the Partnership has no present intention of registering the resale of any of such WPZ Interest Restructuring Common Units or the Cash Purchase Common Units. 

(v) The General Partner has such knowledge, sophistication and experience in business and financial matters so as to be capable of evaluating
the merits and risks of the prospective investment in the WPZ Interest Restructuring Common Units and the Cash Purchase Common Units, and has so evaluated the merits and risks of such investment. The General Partner is able to bear the economic risk
of an investment in the WPZ Interest Restructuring Common Units and the Cash Purchase Common Units and, at the present time and in the foreseeable future, is able to afford a complete loss of such investment. 

(vi) The General Partner understands that the WPZ Interest Restructuring Common Units and the Cash Purchase Common Units are being offered and
issued to the General Partner in reliance upon specific exemptions from the registration requirements of United States federal and state securities Laws and that the Partnership is relying upon the truth and accuracy of, and the General
Partner’s compliance with, the representations, warranties, agreements, acknowledgments and understandings, which are true, correct and complete, of the General Partner set forth herein in order to determine the availability of such exemptions
and the eligibility of the General Partner to acquire the WPZ Interest Restructuring Common Units and the Cash Purchase Common Units. 

(vii) The General Partner has all requisite limited liability company power and authority to execute and deliver this Agreement and to perform
its obligations hereunder in accordance with and upon the terms set forth in this Agreement. 
 (viii) This Agreement has been duly executed
and delivered by the General Partner and, assuming its due execution and delivery by the Partnership, this Agreement constitutes a legal, valid and binding obligation of the General Partner, enforceable against it in accordance with its terms,
subject to Enforceability Exceptions. 
 (ix) Subject to required filings under federal and state securities Laws and compliance with the
rules and regulations of the NYSE, the execution, delivery and performance of this Agreement and the consummation of the Transactions do not and will not (i) constitute a breach or violation of, or result in a default (or an event that, with
notice or lapse of time or both, would become a default) under, or result in the termination or in a right of termination or cancellation of, or accelerate the performance required by, any note, bond, mortgage, indenture, deed of trust, license,
franchise, lease, contract, agreement, joint venture or other instrument or obligation to which the General Partner, The Williams Companies, Inc. (“WMB”) or any of its Subsidiaries (other than the Partnership) or properties is a party or
by which the General Partner, WMB or any of its Subsidiaries (other than the Partnership) or properties is subject or bound that is material to the General Partner, WMB and its Subsidiaries, taken as a whole, (ii) constitute a breach or
violation of, or a default under the organizational documents of the General Partner, (iii) contravene or conflict with or constitute a violation of any provision of any Law binding upon or applicable to the General Partner, or (iv) result
in the creation of any liens or other encumbrances on any of the General Partner’s assets. 

  
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 (x) Excluding fees payable to Morgan Stanley & Co. LLC, no action has been taken by or
on behalf of the General Partner that would give rise to any valid claim against any party hereto for a brokerage commission, finder’s fee or other like payment with respect to the matters contemplated hereby. 

(xi) Neither the execution and delivery by the General Partner of this Agreement nor the consummation by General Partner of the transactions
contemplated hereby do or will require any registrations, qualifications, designations, declarations or filings with, or the obtaining of any permit, authorization, consent, waiver or approval of, or the giving of any notice to, in each case, any
governmental authority, third party or other person. 
 (xii) As of January 6, 2017, (A) the General Partner owns beneficially and of
record, and has good and valid title to, the General Partner Interest and all of the IDRs and (B) the General Partner and its Affiliates own, beneficially or of record, the following Partnership Interests: 346,639,534 Common Units and
16,314,835 Class B Units in the Partnership. Upon the consummation of the WPZ General Partner Interest Recapitalization in accordance with the terms of this Agreement, the General Partner or its Affiliates will own beneficially and of record
the Non-Economic WPZ General Partner Interest, the IDRs, the WPZ Interest Restructuring Common Units and the Cash Purchase Common Units. Except for any rights under the Partnership Agreement, the General
Partner’s rights under this Agreement, and WMB’s and Williams Gas Pipeline Company, LLC’s (the “Investor”) rights under the Common Unit Purchase Agreement, dated as of the date hereof, between the WMB, the Investor
and the Partnership (the “CUPA”), no Affiliate of the General Partner has any written or oral agreement, option or warrant or similar right for the purchase or acquisition of Partnership Interests. 

2. WPZ Interest Restructuring. Effective as of the Closing: 

(a) The Partnership is hereby issuing the WPZ Interest Restructuring Common Units to the General Partner as consideration for the IDR Waiver
and the WPZ General Partner Interest Recapitalization pursuant to the Partnership Agreement Amendment contemplated by Section 2(b), and the performance by the General Partner of its other obligations hereunder, and the General Partner
hereby accepts the WPZ Interest Restructuring Common Units from the Partnership. 
 (b) The General Partner is hereby contributing cash in
an amount equal to the Cash Purchase Common Unit Purchase Price to the Partnership, and in exchange therefore the Partnership is hereby issuing to the General Partner the Cash Purchase Common Units. 

(c) The General Partner is executing and delivering to the Partnership and causing to be adopted the Partnership Agreement Amendment in order
to reflect the IDR Waiver and the WPZ General Partner Interest Recapitalization. 

  
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 3. Intended Tax Treatment and Tax Opinion. 

(a) The Parties intend that the WPZ Interest Restructuring will be treated for U.S. federal income tax purposes as set forth below in this
Section 3(a) (the “Intended Tax Treatment”). Each party shall, and shall cause its controlled Affiliates to, file all tax returns and other reports consistent with the Intended Tax Treatment, unless required by Law to do
otherwise. 
 (i) The WPZ Interest Restructuring should be treated as either (A) a transaction described in
Section 721 of the Code in a manner consistent with Revenue Ruling 84-52, 1984-1 C.B. 157 or (B) a readjustment of partnership items among existing partners of
a partnership not involving a sale or exchange. As a result, no gain or loss should be recognized by the Partnership or existing owners of Common Units, other than the General Partner or its Affiliates, except, in the case of the existing owners of
Common Units, to the extent any gain is recognized as a result of the WPZ Interest Restructuring causing a decrease in their share of Partnership liabilities under Section 752 of the Code. 

(ii) The WPZ Interest Restructuring should result in an adjustment to the capital accounts of the Partnership’s partners
and the carrying values of the Partnership’s properties in accordance with Treasury Regulation Section 1.704-1(b)(2)(iv)(f). 

(b) The Partnership has received the opinion of Andrews Kurth Kenyon LLP dated as of the date hereof that the WPZ Interest Restructuring
should receive the Intended Tax Treatment (the “Tax Opinion”). Such opinion is based upon, among other things, the representations set forth in the “Tax Opinion Certificate” attached as Exhibit II hereto. 

(c) Each party represents that it is not aware of any fact that is in existence on the date hereof or may reasonably be expected to occur on
or prior to the Closing, or has taken or agreed to take any action, that would reasonably be expected to prevent or impede (i) the WPZ Interest Restructuring from qualifying for the Intended Tax Treatment or (ii) the representations in the
Tax Opinion Certificate from being true and correct on the date hereof or on the Closing Date. 
 (d) Each party agrees to use its
reasonable best efforts to cause the WPZ Interest Restructuring to qualify for the Intended Tax Treatment, including by not taking or failing to take any action which action or failure to act such party knows is reasonably likely to prevent such
qualification. 
 (e) The General Partner will use its reasonable best efforts to cause the amount of Partnership liabilities allocable
under Section 752 of the Code to each existing WPZ Common Unit owner, other than the General Partner or its Affiliates, following the WPZ Interest Restructuring and any related issuances of Common Units to equal or exceed the amount of
Partnership liabilities allocable under Section 752 of the Code to such WPZ Common Unit owner as of the year ended December 31, 2016. 

4. The Closing. Upon the terms of this Agreement, the closing of the Transactions (the “Closing”) shall occur on the
date hereof simultaneously with the execution and delivery of this Agreement (“Closing Date”). 
 5. Further
Assurances. Subject to the terms of this Agreement, each party will use commercially reasonable efforts in good faith to take, or cause to be taken, all actions, and to do, 

  
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or cause to be done, all things necessary, proper, desirable or advisable under applicable Laws, so as to enable consummation of the matters contemplated hereby, including obtaining any third
party approval that is required to be obtained by the party in connection with the Transactions and the other matters contemplated by this Agreement, and using commercially reasonable efforts to lift or rescind any injunction or restraining order or
other order adversely affecting the ability of the parties to consummate the matters contemplated hereby, and using commercially reasonable efforts to defend any litigation seeking to enjoin, prevent or delay the consummation of the matters
contemplated hereby or seeking material damages, and each party will cooperate fully with the other parties to that end, and will furnish to the other parties copies of all correspondence, filings and communications between it and its Affiliates, on
the one hand, and any governmental authority, on the other hand, with respect to the matters contemplated hereby. 
 6. Notices. All
statements, requests, notices and agreements hereunder shall be in writing. Any such statements, requests, notices or agreements shall take effect upon receipt thereof if delivered or sent by registered or certified mail, return receipt requested,
and addressed to the intended recipient as set forth below: 
 if to the General Partner, to: 

WPZ GP LLC 
 One Williams Center

 Tulsa, Oklahoma 74172-0172 

			
	Attention:	  	Peter S. Burgess

 with a copy, that shall not constitute notice, to: 

Gibson, Dunn & Crutcher LLP 

1801 California Street 
 Suite
4200 
 Denver, Colorado 80202-2642 

			
	Attention:	  	Steven Talley

 if to the Partnership, to: 

WPZ GP LLC 
 One Williams Center

 Tulsa, Oklahoma 74172-0172 

			
	Attention:	  	Peter S. Burgess
		  	H. Brent Austin, Chairman of the Conflicts Committee

 with a copy, that shall not constitute notice, to: 

Gibson, Dunn & Crutcher LLP 

1801 California Street 
 Suite
4200 
 Denver, Colorado 80202-2642 

			
	Attention:	  	Steven Talley

  
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 and 

Baker Botts L.L.P. 
 910 Louisiana
Street 
 Houston, Texas 77002 

			
	Attention:	  	Joshua Davidson

 7. Amendment; Waiver of Compliance. (a) this Agreement may be amended or modified from time to
time and (b) any failure of any of the parties to comply with any obligation, covenant, agreement or condition in this Agreement may be waived by the party or parties entitled to the benefits thereof, in each case only by the written agreement
of all the parties hereto; provided, however, that the Partnership may not, without the prior approval of the conflicts committee of the board of directors of the General Partner, agree to any amendment or modification of this
Agreement; provided, further, that any such waiver or failure to insist upon strict compliance with such obligation, covenant, agreement or condition shall not operate as a waiver of, or estoppel with respect to, any subsequent or
other failure. 
 8. Assignment. This Agreement shall be binding upon, and inure solely to the benefit of, the General Partner and
the Partnership, and their respective heirs, executors, administrators, successors and assigns, and no other person shall acquire or have any right under or by virtue of this Agreement. This Agreement shall not be assignable by any party hereto,
except with the prior written consent of the other parties hereto. Any attempted assignment or transfer in violation of this Agreement shall be null, void and ineffective. 

9. Entire Agreement. This Agreement, the CUPA, the Partnership Agreement and the Partnership Agreement Amendment constitute the entire
agreement between the Partnership and the General Partner with respect to the subject matter hereof and supersede all prior agreements and understandings (whether written or oral) between the Partnership and the General Partner, with respect to the
subject matter hereof. 
 10. Governing Law. This Agreement shall be governed by and construed in accordance with the Laws of the
State of Delaware. 
 11. Counterparts. This Agreement may be executed by any one or more of the parties hereto in any number of
counterparts, each of which shall be deemed to be an original, but all such counterparts shall together constitute one and the same instrument. 

If the foregoing correctly sets forth the agreement between the General Partner and the Partnership, please indicate your acceptance in the
space provided for that purpose on the following page. 
 [Signature page follows] 

  
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 IN WITNESS WHEREOF, the parties hereto, through their duly authorized officers, have executed this Agreement as
of the day and year set forth above. 
  

					
	WPZ GP LLC
		
	By:	 	 /s/ Ted T. Timmermans

		 	Name:	 	Ted T. Timmermans
		 	Title:	 	Vice President, Controller & Chief Accounting Officer
	
	Williams Partners L.P.
		
		 	By:  WPZ GP LLC
		 	its general partner
		
	By:	 	 /s/ Peter S. Burgess

		 	Name:	 	Peter S. Burgess
		 	Title:	 	Treasurer

 Common Unit Issuance Agreement 

 Exhibit I 

Partnership Agreement Amendment 

See attached 

  
 Exhibit I 

 Amendment No. 8 

to 
 First Amended and
Restated Agreement of Limited Partnership 
 of Williams Partners L.P. 

This Amendment No. 8, dated January 9, 2017 (this “Amendment”), to the First Amended and Restated Agreement of Limited
Partnership, dated as of August 3, 2010, as amended (the “Partnership Agreement”), of Williams Partners L.P., a Delaware limited partnership (the “Partnership”), is entered into and effectuated by WPZ GP LLC, a Delaware
limited liability company and the general partner of the Partnership (the “General Partner”), pursuant to authority granted to it in Article XIII of the Partnership Agreement. Unless otherwise indicated, capitalized terms used but not
defined herein are used as defined in the Partnership Agreement. 
 WHEREAS, Section 13.1(d) of the Partnership Agreement provides that the
General Partner, without the approval of any Partner, may amend any provision of the Partnership Agreement to reflect a change that the General Partner determines does not adversely affect the Limited Partners (including any particular class of
Partnership Interests as compared to other classes of Partnership Interests) in any material respect; 
 WHEREAS, concurrently herewith, the
Partnership and the General Partner are entering into a Common Unit Issuance Agreement, pursuant to which the Partnership is issuing common units representing limited partner interests in the Partnership to the General Partner in consideration for
(a)(i) the General Partner’s permanent waiver of any and all obligations of the Partnership and rights of the General Partner and its Affiliates under this Agreement with respect to the Incentive Distribution Rights (the “IDR Waiver”)
and (ii) the conversion of the General Partner Interest into a non-economic general partner interest in the Partnership (such conversion the “WPZ General Partner Interest Recapitalization”) and
(b) the General Partner’s contribution to the Partnership of cash in an amount equal to $10,000,000 (such contribution and issuance, together with the IDR Waiver and the WPZ General Partner Interest Recapitalization, the “WPZ Interest
Restructuring”); 
 WHEREAS, in connection herewith, the Partnership, The Williams Companies, Inc., a Delaware corporation
(“WMB”) and Williams Gas Pipeline Company, LLC, a Delaware limited liability company (the “Investor”), are entering into a Common Unit Purchase Agreement, pursuant to which the Partnership has agreed to issue and
sell common units representing limited partner interests in the Partnership to the Investor, subject to certain conditions; 
 WHEREAS, the
WPZ Interest Restructuring is being effected pursuant to this Amendment; 
 WHEREAS, the Conflicts Committee of the board of directors of
the General Partner has approved this Amendment and the WPZ Interest Restructuring; and 
 WHEREAS, acting pursuant to Section 13.1(d)(i) of
the Partnership Agreement, the General Partner has determined that the following amendment to the Partnership Agreement does not adversely affect the Limited Partners (including any particular class of Partnership Interests as compared to other
classes of Partnership Interests) in any material respect; 

 NOW THEREFORE, the General Partner does hereby amend the Partnership Agreement as follows: 

1. Section 1.1 of the Partnership Agreement is hereby amended to add the following definitions: 

“2017 Common Unit Issuance Agreement” means the Common Unit Issuance Agreement, dated January 9, 2017, between the
Partnership and the General Partner, pursuant to which the Partnership issued (a) 289,000,000 Common Units to the General Partner in consideration for the permanent waiver of any and all obligations of the Partnership and rights of the General
Partner and its Affiliates under this Agreement with respect to the Incentive Distribution Rights from and after the Incentive Distribution Rights Waiver Date and the conversion of the General Partner Interest into a
non-economic general partner interest in the Partnership and (b) 277,117 Common Units to the General Partner in exchange for the General Partner’s contribution to the Partnership of cash in an amount
equal to $10,000,000. 
 “Aggregate Quantity of IDR Waiver Common Units” is defined in Section 5.11(a). 

“IDR Waiver Common Unit” has the meaning assigned to such term in Section 5.11(a). 

“Incentive Distribution Rights Waiver Date” means January 9, 2017. 

2. Section 1.1 of the Partnership Agreement is hereby amended to delete the following defined terms and their respective definitions: 

“Aggregate Quantity of IDR Reset Common Units”. 

“IDR Reset Common Unit”. 

“IDR Reset Election”. 

“Notional General Partner Units”. 

“Reset MQD”. 

“Reset Notice”. 

3. Section 1.1 is hereby amended to delete and replace the following definitions in their entirety as set forth below: 

“General Partner Interest” means the non-economic management interest of the General
Partner in the Partnership (in its capacity as a general partner without reference to any Limited Partner Interest held by it), and includes any and all benefits to which a General Partner is 

  
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entitled as provided in this Agreement, together with all obligations of a General Partner to comply with the terms and provisions of this Agreement. The General Partner Interest does not include
any rights to receive distributions of Available Cash from Operating Surplus or Capital Surplus or upon the liquidation or winding-up of the Partnership. 

“Percentage Interest” means as of any date of determination (a) as to any Unitholder with respect to Units, the product
obtained by multiplying (i) 100% less the percentage applicable to clause (b) below by (ii) the quotient obtained by dividing (A) the number of Units held by such Unitholder by (B) the total number of Outstanding Units, and
(b) as to the holders of other Partnership Interests issued by the Partnership in accordance with Section 5.6, the percentage established as a part of such issuance. The Percentage Interest with respect to the Incentive Distribution Rights
and the General Partner Interest shall at all times be zero. 
 “Remaining Net Positive Adjustments” means as of the end of
any taxable period, (i) with respect to the Unitholders holding Common Units or Subordinated Units, the excess of (a) the Net Positive Adjustments of the Unitholders holding Common Units or Subordinated Units as of the end of such period
over (b) the sum of those Partners’ Share of Additional Book Basis Derivative Items for each prior taxable period and (ii) with respect to the holders of Incentive Distribution Rights, the excess of (a) the Net Positive
Adjustments of the holders of Incentive Distribution Rights as of the end of such period over (b) the sum of the Share of Additional Book Basis Derivative Items of the holders of the Incentive Distribution Rights for each prior taxable period.

 “Share of Additional Book Basis Derivative Items” means in connection with any allocation of Additional Book Basis
Derivative Items for any taxable period, (i) with respect to the Unitholders holding Common Units or Subordinated Units, the amount that bears the same ratio to such Additional Book Basis Derivative Items as the Unitholders’ Remaining Net
Positive Adjustments as of the end of such taxable period bears to the Aggregate Remaining Net Positive Adjustments as of that time and (ii) with respect to the Partners holding Incentive Distribution Rights, the amount that bears the same
ratio to such Additional Book Basis Derivative Items as the Remaining Net Positive Adjustments of the Partners holding the Incentive Distribution Rights as of the end of such period bears to the Aggregate Remaining Net Positive Adjustments as of
that time. 
 4. Section 4.6 of the Partnership Agreement is hereby amended by adding to Section 4.6 a new subsection (d) as
follows: 
 “(d) For purposes of clarification, the conversion of the General Partner Interest into a
non-economic general partner interest in the Partnership as of the Incentive Distribution Rights Waiver Date is not a transfer of the General Partner Interest subject to this Section 4.6.” 

  
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 5. Section 4.7 of the Partnership Agreement is hereby amended and restated in its entirety as
follows: 
 “Section 4.7 Transfer of Incentive Distribution Rights. Prior to June 30, 2020, a holder of
Incentive Distribution Rights may only transfer any or all of the Incentive Distribution Rights held by such holder without any consent of the Unitholders to (a) an Affiliate of such holder (other than an individual), or (b) another Person
(other than an individual) in connection with (i) the merger or consolidation of such holder of Incentive Distribution Rights with or into such other Person, (ii) the transfer by such holder of all or substantially all of its assets to
such other Person, (iii) the sale of all the ownership interests in such holder or (iv) the pledge, encumbrance, hypothecation or mortgage of the Incentive Distribution Rights in favor a Person providing bona fide debt financing to such
holder as security or collateral for such debt financing and the transfer of Incentive Distribution Rights in connection with the exercise of any remedy of such Person in connection therewith, provided, that such holder entered into such debt
financing transaction in good faith for a valid purpose other than the intent to circumvent the restrictions on transfer of Incentive Distribution Rights that would otherwise have applied. Any other transfer of the Incentive Distribution Rights
prior to June 30, 2020 shall require the prior approval of holders of at least a majority of the Outstanding Common Units (excluding Common Units held by the General Partner and its Affiliates). On or after June 30, 2020, the General
Partner or any other holder of Incentive Distribution Rights may transfer any or all of its Incentive Distribution Rights without Unitholder approval. Notwithstanding anything herein to the contrary, (i) the transfer of Common Units issued
pursuant to Section 5.11 shall not be treated as a transfer of all or any part of the Incentive Distribution Rights, (ii) neither the waiver of rights to payment under the Incentive Distribution Rights following the Incentive Distribution
Rights Waiver Date, the issuance of the IDR Waiver Common Units in consideration therefore nor the transfer of any IDR Waiver Common Unit shall be treated as a transfer of all or any part of the Incentive Distribution Rights and (iii) no
transfer of Incentive Distribution Rights to another Person shall be permitted unless the transferee agrees to be bound by the provisions of this Agreement; provided, that no such agreement shall be required for the pledge, encumbrance,
hypothecation or mortgage of the incentive distribution rights.” 
 6. Section 5.2 of the Partnership Agreement is hereby amended and
restated in its entirety as follows: 
 “Section 5.2 Contributions by the General Partner and its Affiliates.

 (a) On the Closing Date and pursuant to the Contribution Agreement: (i) the General Partner shall contribute to the
Partnership, as a Capital Contribution, the GP Interest (as defined in the Contribution Agreement), in exchange for (A) a continuation of its General Partner Interest equal to a 2% Percentage Interest (after giving effect to any exercise of the
Over-Allotment Option and the Deferred Issuance and Distribution), subject to all of the rights, privileges and duties of the General Partner under this Agreement, and (B) the Incentive Distribution Rights; (ii) Chesapeake Holdings shall
contribute to the Partnership, as a Capital Contribution, the Holdings LP Interest (as defined in the Contribution Agreement) in exchange for 23,913,061 Common Units and 34,538,061 Subordinated Units; (iii) GIP-A shall contribute to the
Partnership, as a Capital Contribution, the GIP-A LP Interest (as defined in the Contribution Agreement) 

  
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in exchange for 7,287,810 Common Units, 12,144,753 Subordinated Units and the right to receive 35.1633907% of the Deferred Issuance and Distribution; (iv) GIP-B shall contribute to the
Partnership, as a Capital Contribution, the GIP-B LP Interest (as defined in the Contribution Agreement) in exchange for 2,826,853 Common Units, 4,710,802 Subordinated Units and the right to receive 13.6394516% of the Deferred Issuance and
Distribution; and (v) GIP-C shall contribute to the Partnership, as a Capital Contribution, the GIP-C LP Interest (as defined in the Contribution Agreement) in exchange for 10,610,898 Common Units, 17,682,506 Subordinated Units and the right to
receive 51.1971577% of the Deferred Issuance and Distribution. 
 (b) Except as set forth in Section 12.8, the General
Partner shall not be obligated to make any additional Capital Contributions to the Partnership. 
 7. Section 5.11 of the Partnership
Agreement is hereby amended and restated in its entirety as follows: 
 “Section 5.11 Issuance of Common Units in
Connection with Waiver of Incentive Distribution Rights. 
 In consideration for the permanent waiver of any and all
obligations of the Partnership and rights of the General Partner and its Affiliates under this Agreement with respect to the Incentive Distribution Rights from and after the Incentive Distribution Rights Waiver Date and the conversion of the General
Partner Interest into a non-economic general partner interest in the Partnership, the General Partner shall be issued 289,000,000 Common Units pursuant to the 2017 Common Unit Issuance Agreement (the
“IDR Waiver Common Units”). The total number of IDR Waiver Common Units issued pursuant to the 2017 Common Unit Issuance Agreement is referred to herein as the “Aggregate Quantity of IDR Waiver Common
Units.” 
 8. Section 5.12(h) of the Partnership Agreement is hereby amended by deleting and replacing the text “(other
than Common Units, the Subordinated Class C Units being issued pursuant to the Subscription Agreement and any additional General Partner Interest pursuant to Section 5.2(b))” with the text “(other than Common Units and the
Subordinated Class C Units being issued pursuant to the Subscription Agreement)”. 
 9. Sections 6.1(d)(x)(B) and (C) of the
Partnership Agreement are hereby amended and restated in their entirety as follows: 
 “(B) With respect to the
adjustment to the Carrying Value of Partnership property pursuant to Section 5.5(d) that occurs upon the date of issuance of the IDR Waiver Common Units pursuant to Section 5.11 (and, if necessary, with respect to any later events triggering
such an adjustment to such Carrying Value), after the application of Section 6.1(d)(x)(A), any Unrealized Gains and Unrealized Losses shall be allocated among the Partners in a manner that to the nearest extent possible results in the Capital
Accounts maintained with respect to such IDR Waiver Common Units issued pursuant to Section 5.11 equaling the product of (A) the Aggregate Quantity of IDR Waiver 

  
 5 

 
Common Units and (B) the Per Unit Capital Amount for an Initial Common Unit. As a result of the events on the date of issuance of the IDR Waiver Common Units, the holders of the General
Partner Interest and the Incentive Distribution Rights shall be deemed for federal income tax purposes to have contributed the economic aspects of the General Partner Interest and the Incentive Distribution Rights for the IDR Waiver Common Units and
shall have thereafter no capital account in the General Partner Interest or the Incentive Distribution Rights. 
 (C) With
respect to any taxable period during which an IDR Waiver Common Unit is transferred to any Person who is not an Affiliate of the transferor, all or a portion of the remaining items of Partnership gross income or gain for such taxable period shall be
allocated 100% to the transferor Partner of such transferred IDR Waiver Common Unit until such transferor Partner has been allocated an amount of gross income or gain that increases the Capital Account maintained with respect to such transferred IDR
Waiver Common Unit to an amount equal to the Per Unit Capital Amount for an Initial Common Unit. A holder shall not be permitted to transfer an IDR Waiver Common Unit (other than a transfer to an Affiliate of the transferor) if the balance in the
Capital Account maintained with respect to such IDR Waiver Common Unit is not equal to the Per Unit Capital Amount for an Initial Common Unit after giving effect to the allocations under Section 6.1(d)(x)(B) and this Section 6.1(d)(x)(C).” 

10. Section 6.5 of the Partnership Agreement is hereby amended and restated in its entirety as follows: 

“Distributions of Available Cash from Capital Surplus. Available Cash that is deemed to be Capital Surplus pursuant
to the provisions of Section 6.3(a) shall be distributed 100% to the Unitholders, Pro Rata.” 
 11. Section 6.8 of the Partnership
Agreement is hereby amended and restated in its entirety as follows: 
 “Section 6.8 Special Provisions Relating
to the Holders of Incentive Distribution Rights. Notwithstanding anything to the contrary set forth in this Agreement, the holder of the Incentive Distribution Rights with respect to such Incentive Distribution Rights (a) shall
possess the rights and obligations provided in this Agreement with respect to a Limited Partner pursuant to Article III and Article VII, (b) irrevocably waives (on behalf of itself and its successors and assigns) its entitlement, if any, to
vote on any matters requiring the approval or vote of the holders of Outstanding Units, except as required by law, (c) irrevocably waives (on behalf of itself and its successors and assigns) its entitlement, if any, to any distributions and
(d) shall not be allocated items of income, gain, loss or deduction or Unrealized Gains or Unrealized Losses. This Section 6.8, including the waivers referenced herein, shall be binding upon the holder of the Incentive Distribution Rights
and its successors and assigns with respect to such Incentive Distribution Rights.” 

  
 6 

 12. Article VI of the Partnership Agreement is hereby amended by adding a new Section 6.13
as follows: 
 “Section 6.13. Special Provision with Respect to Incentive Distribution Rights and the General
Partner Interest. Notwithstanding anything in this Article VI or elsewhere in this Agreement to the contrary, following the Incentive Distribution Rights Waiver Date (i) no portion of any Partnership item, including the Partnership’s
items of income, gain, loss, deduction, Unrealized Gain or Unrealized Loss, shall be allocated with respect to the Incentive Distribution Rights under this Agreement for any period after such date, including under Section 6.1, Section 6.2
or otherwise and (ii) no further distributions shall be made with respect to the Incentive Distribution Rights or the General Partner Interest under this Agreement, including under Section 6.3, Section 6.4, Section 6.5,
Section 12.4 or otherwise.” 
 13. Section 15.1(a) of the Partnership Agreement is hereby amended by deleting and replacing the
text “80%” with the text “85%”. 
 14. Except as hereby amended, the Partnership Agreement shall remain in full force
and effect. 
 15. This Amendment shall be governed by, and interpreted in accordance with, the laws of the State of Delaware, all rights
and remedies being governed by such laws without regard to principles of conflicts of laws. 
 16. Each provision of this Amendment shall be
considered severable and if for any reason any provision or provisions herein are determined to be invalid, unenforceable or illegal under any existing or future law, such invalidity, unenforceability or illegality shall not impair the operation of
or affect those provisions of this Amendment that are valid, enforceable and legal. 
 [Signature Page Follows] 

  
 7 

 IN WITNESS WHEREOF, this Amendment has been executed as of the date first written above.

  

			
	GENERAL PARTNER:
	
	WPZ GP LLC
		
	By:	 	  

	Name:	 	Ted T. Timmermans
	Title:	 	Vice President, Controller & Chief Accounting Officer

 Exhibit II 

Tax Opinion Certificate 

See attached 

  
 Exhibit II 

 WILLIAMS PARTNERS L.P. 

WPZ GP LLC 

ONE WILLIAMS CENTER 

TULSA, OK 74172 

January 9, 2017 
 Andrews Kurth Kenyon LLP

 600 Travis, Suite 4200 
 Houston, Texas 77002 

Tax Opinion Certificate 
 Ladies and Gentlemen:

 You have acted as special tax counsel to Williams Partners L.P., a Delaware limited partnership (the “Partnership”), in
connection with (a) the issuance of 289,000,000 Common Units to WPZ GP LLC, a Delaware limited liability company and the general partner of the Partnership (the “General Partner”), in exchange for (i) the permanent waiver
by the General Partner of all rights to distributions and otherwise with respect to the Incentive Distribution Rights (as defined in the Partnership’s First Amended and Restated Agreement of Limited Partnership, dated as of August 3, 2010,
as amended (the “Partnership Agreement”)) (the “IDR Waiver”) and (ii) the conversion of the General Partner Interest (as defined in the Partnership Agreement) into a
non-economic general partner interest in the Partnership (such conversion, the “WPZ General Partner Interest Recapitalization”) and (b) the issuance of 277,117 Common Units to the General
Partner in exchange for the General Partner’s contribution to the Partnership of cash in an amount equal to $10,000,000 (such issuance and contribution, together with the IDR Waiver and the WPZ General Partner Interest Recapitalization, the
“WPZ Interest Restructuring”). Terms not otherwise defined herein shall have the meanings ascribed to them in the Common Unit Issuance Agreement between the Partnership and the General Partner to be dated as of the date hereof (the
“Common Unit Issuance Agreement”) or the Partnership Agreement. 
 In your capacity as special tax counsel to the
Partnership in connection with the WPZ Interest Restructuring, you will render certain opinions regarding United States federal income tax matters. We hereby make the following representations to you in connection with your rendering of those
opinions: 
 (a) neither the Partnership nor Williams Partners Operating LLC (“Operating LLC”), a Delaware limited
liability company, has elected or will elect to be treated as an association or corporation; 
 (b) the Partnership has been and will be
operated in accordance with (i) all applicable partnership statutes, and (ii) the Partnership Agreement; 
 (c) Operating LLC has
been and will be operated in accordance with (i) all applicable limited liability company statutes, and (ii) the limited liability company agreement of Operating LLC; 

 Andrews Kurth Kenyon LLP 

January 9, 2017 
 Page 11 

 

 (d) for each taxable year, more than 90% of the gross income of the Partnership has been and
will be income from the exploration, development, mining or production, processing, refining, transportation (including pipelines transporting gas, oil, or products thereof), storage or marketing of any mineral or natural resource, including oil,
gas or products thereof which come from either a crude oil refinery or a natural gas processing facility, or other items of income as to which counsel has opined or will opine are “qualifying income” within the meaning of Section 7704(d)
of the Internal Revenue Code; 
 (e) the WPZ Interest Restructuring will be effected pursuant to and in accordance with all relevant
provisions of the Common Unit Issuance Agreement and Amendment No. 8 to the Partnership Agreement, to be dated as of the date hereof (the “Partnership Agreement Amendment”); 

(f) the adjustments to the value of the Partnership’s property required to be made pursuant to Section 5.5(d)(i) of the Partnership
Agreement are being made principally for a substantial business purpose of causing the Capital Accounts of the Partners to properly reflect the intended rights of the Partners on liquidation of the Partnership; and 

(g) for each taxable period, the Partnership has allocated its items of income, gain, loss, deduction and credit among its Partners in
accordance with the Partnership Agreement, and the General Partner has taken, and will take, positions in filing all tax returns of the Partnership (including information returns to unitholders) that are required for federal income tax purposes
intended to preserve the uniformity of Units. 
 We hereby acknowledge that we have made these representations to you, that you will rely
upon them in issuing the opinions, and that they are true and correct in all material respects. 
  

			
	WILLIAMS PARTNERS L.P.
		
	By:	 	WPZ GP LLC
		 	Its General Partner
		
	By:	 	  

	Name:	 	Anthony W. Rackley
	Title:	 	Assistant Treasurer
	
	WPZ GP LLC
		
	By:	 	  

	Name:	 	Anthony W. Rackley
	Title:	 	Assistant TreasurerEX-10.2

 Exhibit 10.2 

Execution Version 

WILLIAMS PARTNERS L.P. 

Common Unit Purchase Agreement 

January 9, 2017 
 The Williams Companies,
Inc. 
 Williams Gas Pipeline Company, LLC 
 One Williams Center

 Tulsa, Oklahoma 74172-0172 
 Attention: Donald R. Chappel

 Williams Partners L.P., a Delaware limited partnership (the “Partnership”), proposes, subject to the terms and
conditions stated herein, to issue and sell to The Williams Companies, Inc., a Delaware corporation (“WMB”), through its wholly-owned subsidiary, Williams Gas Pipeline Company, LLC, a Delaware limited liability company (the
“Investor”), the number of common units representing limited partner interests in the Partnership (the “Common Units”) as calculated pursuant to Section 2(b) hereof (the “Investor Units”). 

This is to confirm the agreement among the Partnership, WMB and the Investor concerning the purchase of the Investor Units from the
Partnership by the Investor. Capitalized terms used but not defined herein will have the meanings given to them in the Partnership’s First Amended and Restated Agreement of Limited Partnership, dated as of August 3, 2010, as amended (the
“Partnership Agreement”). 
 1. Representations, Warranties and Agreements. 

(a) The Partnership represents and warrants to, and agrees with, WMB and the Investor that: 

(i) The Partnership has been duly formed and is validly existing in good standing as a limited partnership under the Delaware Revised Uniform
Limited Partnership Act (the “Delaware Act”) with full limited partnership power and authority necessary to enter into, execute and deliver this Agreement. 

(ii) As of the Closing Date (as defined in Section 4), the Investor Units will be duly authorized and, when issued and delivered to the
Investor against payment therefor in accordance with the terms hereof, will be validly issued, fully paid (to the extent required by the Partnership Agreement), and non-assessable (except as such
non-assessability may be affected by Sections 17-303, 17-607 and 17-804 of the Delaware Act). 

(iii) The Partnership has all requisite limited partnership power and authority to issue, sell and deliver the Investor Units in accordance
with and upon the terms set forth in this Agreement and the Partnership Agreement and to perform its obligations under this Agreement. 

 (iv) This Agreement has been duly executed and delivered by the Partnership and, assuming its due
execution and delivery by the Investor, this Agreement constitutes a legal, valid and binding obligation of the Partnership, enforceable against it in accordance with its terms, except as such enforceability may be limited by applicable bankruptcy,
insolvency, fraudulent transfer, reorganization, moratorium and similar Laws (as defined below) relating to or affecting creditors’ rights generally and to legal principles of general applicability governing the availability of equitable
remedies, including principles of good faith and fair dealing (regardless of whether such enforceability is considered in a proceeding in equity or at law) (collectively, “Enforceability Exceptions”). 

(v) The execution, delivery and performance of this Agreement and the consummation of the transactions contemplated by this Agreement
(collectively, the “Transactions”), including each of the transactions contemplated by Section 2, do not and will not (i) constitute a breach or violation of, or result in a default (or an event that, with notice or lapse
of time or both, would become a default) under, or result in the termination or in a right of termination or cancellation of, or accelerate the performance required by, any note, bond, mortgage, indenture, deed of trust, license, franchise, lease,
contract, agreement, joint venture or other instrument or obligation to which the Partnership or any of its Subsidiaries is a party or by which the Partnership or any of its Subsidiaries or properties is subject or bound that is material to the
Partnership and its Subsidiaries, taken as a whole, (ii) constitute a breach or violation of, or a default under the Partnership Agreement, (iii) contravene or conflict with or constitute a violation of any provision of any law (statutory,
common, or otherwise), constitution, treaty, convention, ordinance, equitable principle, code, rule, regulation, order, writ, injunction, decree, or ruling (“Law”) binding upon or applicable to the Partnership or any of its
Subsidiaries, or (iv) result in the creation of any liens or other encumbrances on any of the Partnership’s (or any of its Subsidiaries’) assets. 

(vi) Except for the fees payable by the Partnership to Evercore Group L.L.C., no action has been taken by or on behalf of the Partnership that
would give rise to any valid claim against any party hereto for a brokerage commission, finder’s fee or other like payment with respect to the matters contemplated hereby. 

(vii) Subject to required filings under federal and state securities Laws and compliance with the rules and regulations of the New York Stock
Exchange (the “NYSE”), neither the execution and delivery by the Partnership of this Agreement nor the consummation by the Partnership of the transactions contemplated hereby do or will require any registrations, qualifications,
designations, declarations or filings with, or the obtaining of any permit, authorization, consent, waiver or approval of, or the giving of any notice to, in each case, any governmental authority, third party or other person. 

(viii) Assuming the accuracy of the representations and warranties of the Investor contained in this Agreement, the Partnership is not
required to register the Investor Units under the Securities Act in connection with the sale of the Investor Units to the Investor. 
 (b)
WMB and the Investor represent and warrant to, and agree with, the Partnership that: 
 (i) Each of WMB and the Investor has been duly
formed and is validly existing in good standing as a corporation and limited liability company, respectively, under the Laws of its jurisdiction of formation, with all corporate or limited liability company power and authority necessary to own or
hold its properties and conduct the business in which it is engaged, in each case in all material respects. 

  
 2 

 (ii) Investor is an “accredited investor,” as such term is defined in Rule 501(a) of
Regulation D promulgated under the Securities Act of 1933, as amended (the “Securities Act”), and the investment by the Investor in the Partnership is for its own account and not for the account of others, for investment purposes.
The Investor Units are being acquired for investment and with no intention of distributing or reselling such Investor Units or any portion thereof or interest therein in any transaction which would be a violation of the securities Laws of the United
States of America or any state or foreign country or jurisdiction. 
 (iii) Investor has been given reasonable access to, full and fair
disclosure of all material information regarding the Partnership and the Investor Units, including reasonable access to the books and records of the Partnership. Investor acknowledges and agrees that it has been provided, to its full satisfaction,
with the opportunity to ask questions concerning the terms and conditions of an investment in the Partnership and has knowingly and voluntarily elected instead to rely solely on its own investigation. 

(iv) Investor understands that the Investor Units are “restricted securities” and have not been registered under the Securities Act
or any applicable state securities Laws. Investor acknowledges that the Investor Units will bear a restrictive legend to that effect. Investor acknowledges and agrees that the Investor must bear the economic risk of this investment indefinitely,
that the Investor Units purchased by the Investor hereunder may not be sold or transferred or offered for sale or transfer by it without registration under the Securities Act and any applicable state securities or Blue Sky Laws or the availability
of exemptions therefrom, and that the Partnership has no present intention of registering the resale of any of such Investor Units. 
 (v)
Investor has such knowledge, sophistication and experience in business and financial matters so as to be capable of evaluating the merits and risks of the prospective investment in the Investor Units, and has so evaluated the merits and risks of
such investment. The Investor is able to bear the economic risk of an investment in the Investor Units and, at the present time and in the foreseeable future, is able to afford a complete loss of such investment. 

(vi) Investor understands that the Investor Units are being offered and sold to the Investor in reliance upon specific exemptions from the
registration requirements of United States federal and state securities Laws and that the Partnership is relying upon the truth and accuracy of, and Investor’s compliance with, the representations, warranties, agreements, acknowledgments and
understandings, which are true, correct and complete, of the Investor set forth herein in order to determine the availability of such exemptions and the eligibility of the Investor to acquire the Investor Units. 

  
 3 

 (vii) WMB and Investor have a substantive pre-existing
relationship with the Partnership. Neither WMB nor the Investor was identified or contacted through any marketing by the Partnership. 

(viii) WMB and the Investor each has all requisite corporate or limited liability company power and authority to execute and deliver this
Agreement and to perform its respective obligations hereunder in accordance with and upon the terms and conditions set forth in this Agreement. 

(ix) This Agreement has been duly executed and delivered by WMB and the Investor and, assuming its due execution and delivery by the
Partnership, this Agreement constitutes a legal, valid and binding obligation of each of WMB and the Investor, enforceable against such Person in accordance with its terms, subject to Enforceability Exceptions. 

(x) The execution, delivery and performance of this Agreement and the consummation of the Transactions do not and will not (i) constitute
a breach or violation of, or result in a default (or an event that, with notice or lapse of time or both, would become a default) under, or result in the termination or in a right of termination or cancellation of, or accelerate the performance
required by, any note, bond, mortgage, indenture, deed of trust, license, franchise, lease, contract, agreement, joint venture or other instrument or obligation to which WMB or the Investor is a party or by which WMB or the Investor or their
properties is subject or bound that is material to WMB or the Investor, (ii) constitute a breach or violation of, or a default under the organizational documents of WMB or the Investor, (iii) contravene or conflict with or constitute a
violation of any provision of any Law binding upon or applicable to WMB or the Investor, or (iv) result in the creation of any liens or other encumbrances on any of WMB’s or the Investor’ assets. 

(xi) Excluding fees payable to Morgan Stanley & Co. LLC, no action has been taken by or on behalf of WMB or the Investor that would
give rise to any valid claim against any party hereto for a brokerage commission, finder’s fee or other like payment with respect to the matters contemplated hereby. 

(xii) Subject to required filings under federal and state securities Laws and compliance with the rules and regulations of the NYSE, neither
the execution and delivery by WMB or the Investor of this Agreement nor the consummation by WMB or the Investor of the transactions contemplated hereby do or will require any registrations, qualifications, designations, declarations or filings with,
or the obtaining of any permit, authorization, consent, waiver or approval of, or the giving of any notice to, in each case, any governmental authority, third party or other person. 

(xiii) As of January 6, 2017, WMB, the Investor and their Affiliates own, beneficially or of record, the following Partnership Interests:
354,234,855 Common Units, 16,690,016 Class B Units, the General Partner Interests and all the IDRs in WPZ. Except for any rights under the Partnership Agreement, WMB and the Investor’s rights under this Agreement, and the General
Partner’s rights under the Common Unit Issuance Agreement, dated as of the date hereof, between the General Partner and the Partnership (the “CUIA”), no Affiliate of the General Partner has any written or oral agreement, option
or warrant or similar right for the purchase or acquisition of Partnership Interests. 

  
 4 

 2. Purchase and Sale. 

(a) WMB shall use its commercially reasonable efforts to consummate an offering (to be registered under the Securities Act) of WMB’s
common stock (the “WMB Common Stock”) on or prior to 4:00 p.m., New York City time, on January 16, 2017 (the “Outside Date”) at a public offering price per share of at least $29.60 (the “Minimum Share
Price”) and with net proceeds (inclusive of the net proceeds from the Option Exercise (as defined below), if any) of up to $3,000,000,000 (the “WMB Common Stock Offering”). 

(b) Subject to the terms and conditions set forth herein, the Partnership agrees to sell the Investor Units to the Investor, and the Investor
agrees to purchase the Investor Units for cash from the Partnership, at a purchase price equal to $36.08586 per Common Unit, which is equal to the five-day volume-weighted average price of WPZ Common Units for
the period ending the day preceding the date hereof, less a discount of 6.5% per Common Unit (the “Investor Unit Issuance Price”). The number of Investor Units to be purchased hereunder shall be equal to (i) the net proceeds
from the WMB Common Stock Offering, after giving effect to the underwriting commissions and discounts with respect thereto and other offering expenses as specified in the prospectus filed with the SEC relating to the WMB Common Stock Offering, up to
$3,000,000,000 (inclusive of the net proceeds, if any, of the Option Exercise) divided by (ii) the Investor Unit Issuance Price, with such quotient rounded down to the nearest whole number. Subject to the prior sentence, in the event that the
underwriters in the WMB Common Stock Offering (the “Underwriters”) exercise their option to purchase additional shares of WMB Common Stock pursuant to the underwriting agreement entered into between WMB and the Underwriters in
connection with the WMB Common Stock Offering (the “Option Exercise”), the Partnership agrees to sell to the Investor, and the Investor agrees to purchase from the Partnership, at the Investor Unit Issuance Price, such additional
number of Investor Units (“Option Exercise Investor Units”) equal to (i) the net proceeds from the Option Exercise, after giving effect to the underwriting commissions and discounts with respect thereto, divided by
(ii) the Investor Unit Issuance Price, with such quotient rounded down to the nearest whole number. The aggregate cash consideration to be paid by the Investor for the Investor Units (as adjusted pursuant to Section 3(b)) is referred to as the
“Cash Consideration.” 
 3. Distribution Adjustment. 

(a) Within ten business days following the announcement of the applicable quarterly distribution, the Investor shall prepare and deliver, or
cause to be prepared and delivered, to the Partnership a statement of its calculation, in reasonable detail, of the amount of the upward adjustment, if any, to the Cash Consideration determined by this Section 3(a) (the “Distribution
Adjustment”). The Distribution Adjustment shall be equal to the sum of: 
 (i) If the Closing occurs prior to or on the record date
for a distribution by the Partnership of Available Cash pursuant to Section 6.3 of the Partnership Agreement with respect to a calendar quarter prior to the calendar quarter in which the Closing occurs, the product of (a) the amount of
such distribution to each Common Unit multiplied by (b) the number of Investor Units to be purchased hereunder at Closing; and 

  
 5 

 (ii) With respect to any distribution by the Partnership of Available Cash pursuant to
Section 6.3 of the Partnership Agreement with respect to the calendar quarter in which the Closing occurs, the product of (a) the product of (1) the amount of such distribution to each Common Unit multiplied by (2) the number of
Investor Units to be purchased hereunder at Closing multiplied by (b) a fraction, (1) the numerator of which is the number of days commencing with the first day of such quarter and ending on the Closing Date and (2) the denominator of
which is the total number of days in such quarter. 
 (b) The Cash Consideration shall be adjusted upward by the Distribution Adjustment and
the Investor shall pay to the Partnership, by wire or interbank transfer of immediately available funds to an account specified in writing by the Partnership, an amount in cash equal to the unpaid amount of the Distribution Adjustment on the date of
each respective distribution by the Partnership in Section 3(a). 
 4. Delivery and Payment for the Investor Units on the Closing
Date. Delivery of and payment for the Investor Units shall be made on or about 10:00 a.m., New York City time, on the WMB Common Stock Offering Closing Date, and with respect to the Option Exercise Investor Units, if applicable, the date of
settlement of the WMB Common Stock issued and sold pursuant to the Option Exercise, or at such other date and time as may be mutually agreed by the Partnership and the Investor (each such date and time of delivery and payment for the Investor Units
being herein called, the “Closing Date”). Delivery of the Investor Units shall be made to the Investor against payment by the Investor of the Cash Consideration (as adjusted pursuant to Section 3(b)) to or upon the order of the
Partnership by wire transfer payable in same-day funds to an account specified by the Partnership. 

5. Conditions of Investor’s Obligations. The obligations of the Investor to effect the Transactions hereunder at the applicable
Closing shall be subject to the conditions, except as waived by the Investor in its sole discretion, that: (i) all representations and warranties and other statements of the Partnership herein are, at and as of the Closing Date, true and
correct in all material respects, (ii) the WMB Common Stock Offering Shall have been consummated at a public offering price per share of WMB Common Stock greater than or equal to the Minimum Share Price, and (iii) no order shall have been
entered and remained in effect in any action or proceeding before any federal, foreign, state or provincial court or governmental agency or other federal, foreign, state or provincial regulatory or administrative agency or commission that would
prevent or make illegal the consummation of the transactions. 
 6. Conditions of the Partnership’s Obligations. The obligations
of the Partnership to effect the Transactions hereunder at the Closing shall be subject to the conditions, except as waived by the Partnership in its sole discretion, that: (i) all representations and warranties and other statements of the
Investor herein are, at and as of the Closing Date, true and correct, except where the failure of such representations and warranties to be true and correct would not have, individually or in the aggregate, a material and adverse effect on the
Partnership and its Subsidiaries, taken as a whole, or hinder or materially delay the ability of the parties to consummate the Proposed Transaction (including by requiring the Partnership to register the Investor Units under the Securities

  
 6 

 
Act in connection with the sale of the Investor Units to the Investor), (ii) the WMB Common Stock Offering Shall have been consummated, and (iii) no order shall have been entered and
remained in effect in any action or proceeding before any federal, foreign, state or provincial court or governmental agency or other federal, foreign, state or provincial regulatory or administrative agency or commission that would prevent or make
illegal the consummation of the transactions. 
 7. Termination. Either party may terminate this Agreement at any time on or after
the Outside Date if the WMB Common Stock Offering has not been consummated by the Outside Date, provided that neither WMB nor Investor shall be entitled to terminate this Agreement pursuant to this Section 7 if there has been a material breach
of any of their obligations under Section 2 hereof. 
 8. Further Assurances. Subject to the terms and conditions of this
Agreement, each party will use commercially reasonable efforts in good faith to take, or cause to be taken, all actions, and to do, or cause to be done, all things necessary, proper, desirable or advisable under applicable Laws, so as to enable
consummation of the matters contemplated hereby, including obtaining any third party approval that is required to be obtained by the party in connection with the Transactions and the other matters contemplated by this Agreement, and using
commercially reasonable efforts to lift or rescind any injunction or restraining order or other order adversely affecting the ability of the parties to consummate the matters contemplated hereby, and using commercially reasonable efforts to defend
any litigation seeking to enjoin, prevent or delay the consummation of the matters contemplated hereby or seeking material damages, and each party will cooperate fully with the other parties to that end, and will furnish to the other parties copies
of all correspondence, filings and communications between it and its Affiliates, on the one hand, and any governmental authority, on the other hand, with respect to the matters contemplated hereby. 

9. Notices. All statements, requests, notices and agreements hereunder shall be in writing. Any such statements, requests, notices or
agreements shall take effect upon receipt thereof if delivered or sent by registered or certified mail, return receipt requested, and addressed to the intended recipient as set forth below: 

if to WMB or the Investor, to: 
 WPZ GP LLC 

One Williams Center 
 Tulsa,
Oklahoma 74172-0172 
 Attention:      Peter S. Burgess 

with a copy, that shall not constitute notice, to: 

Gibson, Dunn & Crutcher LLP 

1801 California Street 
 Suite
4200 
 Denver, Colorado 80202-2642 

Attention:      Steven Talley 

  
 7 

 if to the Partnership, to: 

WPZ GP LLC 
 One Williams Center

 Tulsa, Oklahoma 74172-0172 

Attention:      Peter S. Burgess 

                      H. Brent
Austin, Chairman of the Conflicts Committee 
 with a copy, that shall not constitute notice, to: 

Gibson, Dunn & Crutcher LLP 

1801 California Street 
 Suite
4200 
 Denver, Colorado 80202-2642 

Attention:      Steven Talley 

and 
 Baker Botts L.L.P. 

910 Louisiana Street 
 Houston,
Texas 77002 
 Attention:      Joshua Davidson 

10. Amendment; Waiver of Compliance. (a) this Agreement may be amended or modified from time to time and (b) any failure of
any of the parties to comply with any obligation, covenant, agreement or condition in this Agreement may be waived by the party or parties entitled to the benefits thereof, in each case only by the written agreement of all the parties hereto;
provided, however, that the Partnership may not, without the prior approval of the conflicts committee of the board of directors of the General Partner, agree to any amendment or modification of this Agreement; provided,
further, that any such waiver or failure to insist upon strict compliance with such obligation, covenant, agreement or condition shall not operate as a waiver of, or estoppel with respect to, any subsequent or other failure. 

11. Assignment. This Agreement shall be binding upon, and inure solely to the benefit of, the Investor and the Partnership, and their
respective heirs, executors, administrators, successors and assigns, and no other person shall acquire or have any right under or by virtue of this Agreement. This Agreement shall not be assignable by any party hereto, except with the prior written
consent of the other parties hereto. Any attempted assignment or transfer in violation of this Agreement shall be null, void and ineffective. 

12. Entire Agreement. This Agreement, the CUIA, the Partnership Agreement and Amendment No. 8 to the Partnership Agreement
(attached to the CUIA as Exhibit I) constitute the entire agreement between the Partnership, WMB and the Investor with respect to the subject matter hereof and supersede all prior agreements and understandings (whether written or oral)
between the Partnership, WMB and the Investor, with respect to the subject matter hereof. 
 13. Governing Law. This Agreement shall
be governed by and construed in accordance with the Laws of the State of Delaware. 

  
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 14. Counterparts. This Agreement may be executed by any one or more of the parties hereto
in any number of counterparts, each of which shall be deemed to be an original, but all such counterparts shall together constitute one and the same instrument. 

If the foregoing correctly sets forth the agreement between WMB, the Investor and the Partnership, please indicate your acceptance in the
space provided for that purpose on the following page. 
 [Signature page follows] 

  
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 IN WITNESS WHEREOF, the parties hereto, through their duly authorized officers, have executed this Agreement as
of the day and year set forth above. 
  

					
	The Williams Companies, Inc.
		
	By:	 	 /s/ Peter S. Burgess

		 	Name:	 	Peter S. Burgess
		 	Title:	 	Vice President Treasury & Insurance, Treasurer
	
	Williams Gas Pipeline Company, LLC
		
	By:	 	 /s/ Anthony W. Rackley

		 	Name:	 	Anthony W. Rackley
		 	Title:	 	Vice President Tax and Assistant Treasurer
	
	Williams Partners L.P.
		
		 	By:  WPZ GP LLC
		 	its general partner
		
	By:	 	 /s/ Ted T. Timmermans

		 	Name:	 	Ted T. Timmermans
		 	Title:	 	Vice President, Controller & Chief Accounting Officer

 [Common Unit Purchase Agreement]

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