Document:

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                                                                    EXHIBIT 4(e)

                     SECOND AMENDMENT TO SECOND AMENDED AND
                            RESTATED CREDIT AGREEMENT

     THIS SECOND AMENDMENT TO SECOND AMENDED AND RESTATED CREDIT AGREEMENT
(herein called this "Amendment"), dated as of January 24, 2000 is entered into
by and among the Borrowers party to the Credit Agreement (as hereinafter
defined), the Banks from time to time party to the Credit Agreement, the
Co-Agents as named therein and Citibank, N.A., as agent for the Banks (in such
capacity, the "Agent"). Except as otherwise defined or as the context requires,
terms defined in the Credit Agreement are used herein as therein defined.

                              W I T N E S S E T H:

     WHEREAS, The Williams Companies, Inc. ("TWC") and certain of its
Subsidiaries (TWC and such Subsidiaries, the "Borrowers") have entered into a
certain Second Amended and Restated Credit Agreement dated as of July 23, 1997
(the "1997 Credit Agreement") with the Banks, the Co-Agents and the Agent, which
agreement has been amended by an Amendment to Second Amended and Restated Credit
Agreement dated January 26, 1999 and letter agreements dated as of March 15,
1999, May 20, 1999 and September 27, 1999 (the 1997 Credit Agreement as so
amended the "Credit Agreement"); and

     WHEREAS, the Borrowers and the Banks now desire to amend the Credit
Agreement in certain respects, as hereinafter provided,

     NOW, THEREFORE, in consideration of the premises and the mutual agreements
herein contained, the Borrowers and the Banks hereby agree as follows:

     SECTION 1. Amendment of Section 1.01 of the Credit Agreement. Section 1.01
of the Credit Agreement is hereby amended as follows:

          (a) The definition of "Applicable Margin" in such Section 1.01 is
hereby amended and restated in its entirety to read as follows:

          "Applicable Margin" means as to any Eurodollar Rate Advance to any
     Borrower, the rate per annum set forth in Schedule XI under the heading
     "Applicable Margin" for the relevant Rating Category applicable to such
     Borrower from time to time. The Applicable Margin determined pursuant to
     this definition for any Eurodollar Rate Advance to any Borrower shall
     change when and as the relevant Rating Category applicable to such Borrower
     changes.

          (b) The definition of "Applicable WilTel Debt to EBITDA Ratio" in such
Section 1.01 is hereby deleted in its entirety.

<PAGE>   2

          (c) The definition of "Applicable WPL Debt to TNW Ratio" in such
Section 1.01 is hereby deleted in its entirety.

          (d) The definition of "Borrowers" in such Section 1.01 is amended and
restated to read in its entirety as follows:

          "Borrowers" means TWC, NWP, TGPL, and TGT.

          (e) The following definitions are added to such Section 1.01
immediately after the definition of "Business Day":

          "Cash Holdings" of any Person means the total investment of such
     Person at the time of determination in:

               (a) demand deposits and time deposits maturing within one year
          with a Bank (or other commercial banking institution of the stature
          referred to in clause (d)(i));

               (b) any note or other evidence of indebtedness, maturing not more
          than one year after such time, issued or guaranteed by the United
          States Government or by a government of another country which carries
          a long-term rating of Aaa by Moody's or AAA by S&P;

               (c) commercial paper, maturing not more than nine months from the
          date of issue, which is issued by

                   (i) a corporation (other than the affiliate of a Borrower)
               rated (x) A-1 by S&P, P-1 by Moody's, F-1 by Fitch or A by Duff
               and Phelps or (y) lower than set forth in clause (x) above,
               provided that the value of all such commercial paper shall not
               exceed 10% of the total value of all commercial paper comprising
               "Cash Holdings," or

                   (ii) any Bank (or its holding company) with a rating on its
               long-term unsecured debt of at least AA from S&P or Aa from
               Moody's;

               (d) any certificate of deposit or bankers acceptance, maturing
          not more than three years after such time, which is issued by either

                   (i) a commercial banking institution that is a member of the
               Federal Reserve System and has a combined capital and surplus and
               undivided profits of not less than $1,000,000,000, or

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                   (ii) any Bank with a rating on its long-term unsecured debt
               of at least AA by S&P or Aaa by Moody's;

               (e) notes or other evidences of indebtedness, maturing not more
          than three years after such time, issued by

                   (i) a corporation (other than an affiliate of a Borrower)
               rated AA by S&P or Aa by Moody's; or

                   (ii) any Bank (or its holding company) with a rating on its
               long-term unsecured debt of at least AA by S&P or Aaa by Moody's;
               or

               (f) any repurchase agreement entered into with any Bank (or other
          commercial banking institution of the stature referred to in clause
          (d)(i)) which

                   (i) is secured by a fully perfected security interest in any
               obligation of the type described in any of clauses (a) through
               (d);

                   (ii) has a market value at the time such repurchase
               agreement is entered into of not less than 100% of the repurchase
               obligation of such Bank (or other commercial banking institution)
               thereunder; and

               (g) money market preferred instruments by participation in a
          Dutch auction (or the equivalent) where the investment is rated no
          lower than Aa by Moody's or AA by S&P.

          "ChoiceSeat" means ChoiceSeat, L.L.C., a Cayman Islands limited
     liability company.

          (f) The definition of "Consolidated Net Worth" in such Section 1.01 is
amended and restated to read in its entirety as follows:

          "Consolidated Net Worth" of any Person means the Net Worth of such
     Person and its Subsidiaries on a Consolidated basis plus, in the case of
     TWC, the Designated Minority Interests to the extent not otherwise
     included; provided that, in no event shall the value ascribed to Designated
     Minority Interests exceed $511,700,000 in the aggregate.

          (g) The following definition is added to such Section 1.01 immediately
after the definition of "Debt":

          "Designated Minority Interests" of TWC means, as of any date of
     determination, the total of the minority interests in the following
     Subsidiaries of TWC: (i) El Furrial, (ii) PIGAP II, (iii) Nebraska Energy,
     (iv) Seminole, (v) WCG,

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     (vi) WilTel, (vii) ChoiceSeat, (viii) PowerTel, and (ix) other Consolidated
     Subsidiaries of TWC, as presented in its Consolidated balance sheet, in an
     amount not to exceed in the aggregate $9,000,000 for such other
     Consolidated Subsidiaries not referred to in clauses (i) through (viii);
     provided that minority interests which provide for a stated preferred
     cumulative return shall not be included in "Designated Minority Interests."

          (h) The following definition is added to such Section 1.01 immediately
after the definition of "EBITDA":

          "El Furrial" means WilPro Energy Services (El Furrial) Limited, a
     Cayman Islands corporation.

          (i) The following definitions are added to Section 1.01 immediately
after the definition of "Multiple Employer Plan":

          "Nebraska Energy" means Nebraska Energy, L.L.C., a Kansas limited
     liability company.

          "Net Debt" means for any Person, as of any date of determination, the
     excess of (x) the aggregate amount of all Debt of such Person and its
     Subsidiaries on a Consolidated basis over (y) the sum of the Cash Holdings
     of such Person and its Subsidiaries on a Consolidated basis.

          (j) The definition of "Permitted WCG Liens" in such Section 1.01 is
hereby deleted in its entirety.

          (k) The definition of "Permitted WHD Liens" in such Section 1.01 is
hereby deleted in its entirety.

          (l) The definition of "Permitted WilTel Liens" in such Section 1.01 is
hereby deleted in its entirety.

          (m) The definition of "Permitted WPL Liens" in such Section 1.01 is
hereby deleted in its entirety.

          (n) The following definition is added to such Section 1.01 immediately
after the definition of "Person":

          "PIGAP II" means WilPro Energy Services (PIGAP II) Limited, a Cayman
     Islands corporation.

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          (o) The following definition is added to such Section 1.01 immediately
after the definition of "Plan":

          "PowerTel" means PowerTel Limited, an Australian corporation.

          (p) The definition of "Sale and Lease-Back Transaction" in such
Section 1.01 is amended by deleting the proviso contained therein such that the
definition reads in its entirety as follows:

          Sale and Lease-Back Transaction" of any Person means any arrangement
     entered into by such Person or any Subsidiary of such Person, directly or
     indirectly, whereby such Person or any Subsidiary of such Person shall sell
     or transfer any property, whether now owned or hereafter acquired, and
     whereby such Person or any Subsidiary of such Person shall then or
     thereafter rent or lease as lessee such property or any part thereof or
     other property which such Person or any Subsidiary of such Person intends
     to use for substantially the same purpose or purposes as the property sold
     or transferred.

          (q) The following definition is added to such Section 1.01 immediately
after the definition of "Sale and Lease-Back Transaction":

          "Seminole" means Seminole Pipeline Company, a Delaware corporation.

          (r) The definition of "WilTel Debt to EBITDA Ratio" in such Section
1.01 is hereby deleted in its entirety.

          (s) The definition of "WilTel Pro Forma Income Statements" in such
Section 1.01 is hereby deleted in its entirety.

          (t) The definition of "WNG" in such Section 1.01 is deleted and
replaced in its entirety with the following:

          "WPC" means Williams Gas Pipelines Central, Inc., a Delaware
     corporation, formerly Williams Natural Gas Company.

          (u) The definition of "WPL Debt to TNW Ratio" in such Section 1.01 is
hereby deleted in its entirety.

     SECTION 2. Amendment of Section 3.02(a). Section 3.02(a) of the Credit
Agreement is hereby amended by deleting clause (iv) thereof.

     SECTION 3. Amendment of Section 3.03(iii)(a). Section 3.03(iii)(a) is
hereby amended by deleting clause (5) thereof.

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     SECTION 4. Deletion of Section 4.01(n). Section 4.01(n) of the Credit
Agreement is hereby deleted in its entirety.

     SECTION 5. Amendment of Section 5.01(b)(x). Section 5.01(b)(x) is hereby
amended and restated in its entirety to read as follows:

          (x) not more than 60 days (or 105 days in the case of the last fiscal
     quarter of a fiscal year of such Borrower) after the end of each fiscal
     quarter of such Borrower, a certificate of an authorized financial officer
     of such Borrower stating the respective ratings, if any, by each of S&P and
     Moody's of the senior unsecured long-term debt of such Borrower as of the
     last day of such quarter; and

     SECTION 6. Amendment of Section 5.02(a). Section 5.02(a) of the Credit
Agreement is hereby amended by deleting clauses (ii), (vi), (vii) and (viii)
thereof and replacing them with the following: "(ii) [Intentionally Deleted]";
"(vi) [Intentionally Deleted]"; "(vii) [Intentionally Deleted]"; and "(viii)
[Intentionally Deleted]", respectively.

     SECTION 7. Amendment of Section 5.02(b). Section 5.02(b) of the Credit
Agreement is hereby amended as follows:

          (a) Clause (i) of such Section 5.02(b) is hereby amended and restated
to read in its entirety as follows:

          (b) Debt. (i) In the case of TWC, permit the ratio of (A) the
     aggregate amount of Net Debt of TWC to (B) the sum of the Consolidated Net
     Worth of TWC plus Net Debt of TWC to exceed (1) 0.7 to 1.0 at any time
     during the period beginning on the date hereof through December 31, 2000,
     (2) 0.675 to 1.0 at any time during the period beginning on January 1, 2001
     through December 31, 2001, or (3) 0.65 to 1.0 at any time during the period
     beginning on January 1, 2002 through the term of this Agreement;

          (b) Clause (ii) of such Section 5.02(b) is hereby deleted in its
entirety and replaced with the following: "(ii) [Intentionally Deleted]."

          (c) Clause (iii) of such Section 5.02(b) is hereby amended by deleting
the words "and WHD" in the parenthetical occurring in the first line thereof.

     SECTION 8. Amendment of Section 5.02(c). Section 5.02(c) of the Credit
Agreement is hereby amended by deleting clauses (iv) and (vi) thereof and
replacing them with "(iv) [Intentionally Deleted]" and "(vi) [Intentionally
Deleted]," respectively

     SECTION 9. Amendment of Section 5.02(d). Section 5.02(d) of the Credit
Agreement is hereby amended as follows:

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          (a) The reference to "WNG" in the parenthetical beginning in the
     seventh line thereof is replaced with a reference to "WPC."

          (b) The word "and" is inserted in the ninth line thereof after the
     phrase "Exhibit E", the comma after the phrase "Exhibit E" in the twelfth
     line thereof is replaced with a period, and the ending phrase reading "and
     (4) any encumbrances and restrictions created in connection with any sale
     and lease-back of cushion gas by any Borrower or any Subsidiary of any
     Borrower or any sale and lease-back of inventory by WPL or any of its
     Subsidiaries (other than another Borrower)," together with the final
     period, are hereby deleted.

     SECTION 10. Amendment of Section 5.02(f). Section 5.02(f) of the Credit
Agreement is hereby amended as follows: the references to WilTel, WCG and WHD in
clause (1) in the fifth line of such Section 5.02(f) and in clause (2) in the
eighth line of such Section 5.02(f) are each deleted. References in such Section
to "WNG" are replaced by references to "WPC".

     SECTION 11. Amendment of Section 5.02(j). Section 5.02(j) is amended by
inserting the word "and" after the phrase "TGT and its Subsidiaries," in clause
(iv) thereof, and replacing the comma ending clause (v) with a period and
deleting clauses (vi) and (vii) thereof.

     SECTION 12. Amendments of Schedules III through VII. The following clauses
of Schedules III through VII are hereby deleted: clause (aa) of each of
Schedules III, IV and V; clause (bb) of Schedule VI and clause (j) of Schedule
VII.

     SECTION 13. Deletion of Schedule VIII. Schedule VIII is hereby deleted in
its entirety.

     SECTION 14. Withdrawal of WHD; Merger. Pursuant to a letter dated May 20,
1999 delivered to the Agent from Williams Holdings of Delaware, Inc. ("WHD"),
WHD has terminated, pursuant to Section 2.04(a) of the Credit Agreement, the
Commitments of the Banks to WHD in whole and has elected, pursuant to Section
2.04(b) of the Credit Agreement, to cease to be a Borrower under the Credit
Agreement, effective as of the date of such letter; provided that, pursuant to
Section 2.04(b) of the Credit Agreement, WHD remains a Borrower for purposes of
the definition of Majority Banks and for purposes of Sections 2.11, 2.14 and
8.04 thereof. WHD subsequently merged into TWC, such merger effective as of July
31, 1999 and, to the extent that WHD continues in its capacity as a Borrower
pursuant to Section 2.04(b) of the Credit Agreement, TWC assumed the obligations
of WHD.

     SECTION 15. To induce the Agent and the Banks to enter into this Amendment,
the Borrowers hereby reaffirm, as of the date hereof, their representations and
warranties contained in Article IV of the Credit Agreement (except to the extent
such representations and warranties relate solely to an earlier date) and
additionally represents and warrants as follows:

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          (a) Each Borrower is a duly organized or validly formed, validly
     existing and in good standing under the laws of the State of Delaware and
     has all corporate or limited liability company powers and all governmental
     licenses, authorizations, certificates, consents and approvals required to
     carry on its business as now conducted in all material respects, except for
     those licenses, authorizations, certificates, consents and approvals which
     the failure to have could not reasonably be expected to have a material
     adverse effect on the business, assets, condition or operation of such
     Borrower and its Subsidiaries taken as a whole. Each Subsidiary of the
     Borrower is duly organized or validly formed, validly existing and (if
     applicable) in good standing under the laws of its jurisdiction of
     incorporation or formation, except where the failure to be so organized,
     existing and in good standing could not reasonably be expected to have a
     material adverse effect on the business, assets, condition or operations of
     such Borrower and its Subsidiaries taken as a whole. Each Subsidiary of any
     Borrower has all corporate powers and all governmental licenses,
     authorizations, certificates, consents and approvals required to carry on
     its business as now conducted in all material respects, except for those
     licenses, authorizations, certificates, consents and approvals which the
     failure to have could not reasonably be expected to have a material adverse
     effect on the business, assets, condition or operation of such Borrower and
     its Subsidiaries taken as a whole.

          (b) The execution, delivery and performance by each Borrower of this
     Amendment and the consummation of the transactions contemplated by this
     Amendment are within such Borrower's corporate or limited liability company
     powers, have been duly authorized by all necessary corporate or limited
     liability company action, do not contravene (i) such Borrower's charter,
     by-laws or formation agreement or (ii) any law or any contractual
     restriction binding on or affecting such Borrower and will not result in or
     require the creation or imposition of any Lien.

          (c) No authorization or approval or other action by, and no notice to
     or filing with, any governmental authority or regulatory body is required
     for the due execution, delivery and performance by any Borrower of this
     Amendment or the consummation of the transactions contemplated by this
     Amendment.

          (d) This Amendment has been duly executed and delivered by each
     Borrower. This Amendment and the Credit Agreement as amended by this
     Amendment are the legal, valid and binding obligations of each Borrower
     enforceable against such Borrower in accordance with its terms, except as
     such enforceability may be limited by any applicable bankruptcy,
     insolvency, reorganization, moratorium or similar law affecting creditors'
     rights generally and by general principles of equity.

          (e) Except as set forth in the Public Filings, there is, as to each
     Borrower, no pending or, to the knowledge of each Borrower, threatened
     action or proceeding

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     affecting such Borrower or any material Subsidiary of such Borrower before
     any court, governmental agency or arbitrator, which could reasonably be
     expected to materially and adversely affect the financial condition or
     operations of such Borrower and its Subsidiaries taken as a whole or which
     purports to affect the legality, validity, binding effect or enforceability
     of this Amendment, the Credit Agreement or any Note. For the purposes of
     this Section, "Public Filings" shall mean each Borrower's respective annual
     reports on Form 10-K for the year ended December 31, 1998, and each
     Borrower's respective quarterly reports on Form 10-Q for the quarter ended
     September 30, 1999.

          (f) Upon giving effect to this Amendment, no event has occurred and is
     continuing which constitutes an Event of Default or which would constitute
     an Event of Default but for the requirement that notice be given or time
     elapse or both.

     SECTION 16. The effectiveness of this Amendment is conditioned upon receipt
by the Agent for the account of each Bank the participation and amendment fee
due such Bank pursuant to that certain updated information memorandum delivered
to the Banks in December, 1999 and receipt by the Agent of all the following
documents, each in form and substance satisfactory to the Agent:

          (a) Counterparts of this Amendment executed by each of the Borrowers,
     the Agent and the Majority Banks;

          (b) A certificate of the Secretary or Assistant Secretary of each
     Borrower as to (i) any changes (or the absence of changes) since January
     26, 1999 to its certificate of incorporation or certificate of formation
     and its by-laws or formation agreement as of the date hereof, (ii) the
     resolutions of the Borrower authorizing the execution of this Amendment and
     (iii) the names and true signatures of the officers authorized to execute
     this Amendment;

          (c) An opinion of William G. von Glahn, General Counsel of the
     Borrower, substantially in the form of Exhibit A hereto; and

          (d) Such other documents as the Agent shall have reasonably requested.

     SECTION 17. This Amendment shall be deemed to be an amendment to the Credit
Agreement, and the Credit Agreement, as amended hereby, is hereby ratified,
approved and confirmed in each and every respect. All references to the Credit
Agreement in any other document, instrument, agreement or writing shall
hereafter be deemed to refer to the Credit Agreement as amended hereby.

     SECTION 18. THIS AMENDMENT SHALL BE A CONTRACT MADE UNDER AND GOVERNED BY
THE INTERNAL LAWS OF THE STATE OF NEW YORK. Whenever possible each provision of
this Amendment shall be interpreted in such manner as to be effective and

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valid under applicable law, but if any provision of this Amendment shall be
prohibited by or invalid under applicable law, such provision shall be
ineffective to the extent of such prohibition or invalidity, without
invalidating the remainder of such provision or the remaining provisions of this
Amendment.

     SECTION 19. This Amendment may be executed in any number of counterparts,
all of which taken together shall constitute one and the same instrument, and
any party hereto may execute this Amendment by signing one or more counterparts.

     SECTION 20. This Amendment shall be binding upon each of the Borrowers, the
Agent and the Banks and their respective successors and assigns, and shall inure
to the benefit of each of the Borrowers, the Agent and the Banks and the
successors and assigns of the Banks.

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     IN WITNESS WHEREOF, the parties have caused this Amendment to be executed
by their respective officers thereunto duly authorized, as of the date first
above written.

                                       BORROWERS:

                                       THE WILLIAMS COMPANIES, INC.

                                       By:
                                          --------------------------------------
                                       Name: James G. Ivey
                                       Title: Treasurer

                                       TRANSCONTINENTAL GAS PIPE LINE
                                       CORPORATION

                                       By:
                                          --------------------------------------
                                       Name:
                                            ------------------------------------
                                       Title:
                                             -----------------------------------

                                       TEXAS GAS TRANSMISSION CORPORATION

                                       By:
                                          --------------------------------------
                                       Name:
                                            ------------------------------------
                                       Title:
                                             -----------------------------------

                                       NORTHWEST PIPELINE CORPORATION

                                       By:
                                          --------------------------------------
                                       Name:
                                            ------------------------------------
                                       Title:
                                             -----------------------------------

                                      S-1
<PAGE>   12

              [Signature page to Second Amendment to Second Amended
                         and Restated Credit Agreement]

                                       AGENT:

                                       CITIBANK, N.A.

                                       By:
                                          --------------------------------------
                                       Name:
                                            ------------------------------------
                                       Title:
                                             -----------------------------------

                                       BANKS:

                                       CITIBANK, N.A.

                                       By:
                                          --------------------------------------
                                       Name:
                                            ------------------------------------
                                       Title:
                                             -----------------------------------

                                      S-2
<PAGE>   13

              [Signature page to Second Amendment to Second Amended
                         and Restated Credit Agreement]

                                       THE CHASE MANHATTAN BANK

                                       By:
                                          --------------------------------------
                                       Name:
                                            ------------------------------------
                                       Title:
                                             -----------------------------------

                                      S-3
<PAGE>   14

              [Signature page to Second Amendment to Second Amended
                         and Restated Credit Agreement]

                                       SUNTRUST BANK, ATLANTA

                                       By:
                                          --------------------------------------
                                       Name:
                                            ------------------------------------
                                       Title:
                                             -----------------------------------

                                       By:
                                          --------------------------------------
                                       Name:
                                            ------------------------------------
                                       Title:
                                             -----------------------------------

                                      S-4
<PAGE>   15

              [Signature page to Second Amendment to Second Amended
                         and Restated Credit Agreement]

                                       CREDIT LYONNAIS NEW YORK BRANCH

                                       By:
                                          --------------------------------------
                                       Name:
                                            ------------------------------------
                                       Title:
                                             -----------------------------------

                                      S-5
<PAGE>   16

              [Signature page to Second Amendment to Second Amended
                         and Restated Credit Agreement]

                                       BANK OF AMERICA, N.A., FORMERLY BANK OF
                                       AMERICA NATIONAL TRUST AND SAVINGS
                                       ASSOCIATION AND NATIONSBANK, N.A.

                                       By:
                                          --------------------------------------
                                       Name:
                                            ------------------------------------
                                       Title:
                                             -----------------------------------

                                      S-6
<PAGE>   17

              [Signature page to Second Amendment to Second Amended
                         and Restated Credit Agreement]

                                       CIBC INC.

                                       By:
                                          --------------------------------------
                                       Name:
                                            ------------------------------------
                                       Title:
                                             -----------------------------------

                                      S-7
<PAGE>   18

              [Signature page to Second Amendment to Second Amended
                         and Restated Credit Agreement]

                                       BANK ONE, NA, FORMERLY KNOWN AS THE FIRS
                                       TNATIONAL BANK OF CHICAGO

                                       By:
                                          --------------------------------------
                                       Name:
                                            ------------------------------------
                                       Title:
                                             -----------------------------------

                                      S-8

<PAGE>   19

              [Signature page to Second Amendment to Second Amended
                         and Restated Credit Agreement]

                                       BANK OF MONTREAL

                                       By:
                                          --------------------------------------
                                       Name:
                                            ------------------------------------
                                       Title:
                                             -----------------------------------

                                      S-9
<PAGE>   20

              [Signature page to Second Amendment to Second Amended
                         and Restated Credit Agreement]

                                       THE BANK OF NEW YORK

                                       By:
                                          --------------------------------------
                                       Name:
                                            ------------------------------------
                                       Title:
                                             -----------------------------------

                                      S-10
<PAGE>   21

              [Signature page to Second Amendment to Second Amended
                         and Restated Credit Agreement]

                                       THE BANK OF NOVA SCOTIA

                                       By:
                                          --------------------------------------
                                       Name:
                                            ------------------------------------
                                       Title:
                                             -----------------------------------

                                      S-11

<PAGE>   22

              [Signature page to Second Amendment to Second Amended
                         and Restated Credit Agreement]

                                       BARCLAYS BANK PLC

                                       By:
                                          --------------------------------------
                                       Name:
                                            ------------------------------------
                                       Title:
                                             -----------------------------------

                                      S-12
<PAGE>   23

              [Signature page to Second Amendment to Second Amended
                         and Restated Credit Agreement]

                                       BANKBOSTON, N.A.

                                       By:
                                          --------------------------------------
                                       Name:
                                            ------------------------------------
                                       Title:
                                             -----------------------------------

                                      S-13
<PAGE>   24

              [Signature page to Second Amendment to Second Amended
                         and Restated Credit Agreement]

                                       THE FUJI BANK, LIMITED,

                                       By:
                                          --------------------------------------
                                       Name:
                                            ------------------------------------
                                       Title:
                                             -----------------------------------

                                      S-14
<PAGE>   25

              [Signature page to Second Amendment to Second Amended
                         and Restated Credit Agreement]

                                       MELLON BANK, N.A.

                                       By:
                                          --------------------------------------
                                       Name:
                                            ------------------------------------
                                       Title:
                                             -----------------------------------

                                      S-15
<PAGE>   26

              [Signature page to Second Amendment to Second Amended
                         and Restated Credit Agreement]

                                       MORGAN GUARANTY TRUST COMPANY OF
                                       NEW YORK

                                       By:
                                          --------------------------------------
                                       Name:
                                            ------------------------------------
                                       Title:
                                             -----------------------------------

                                      S-16
<PAGE>   27

              [Signature page to Second Amendment to Second Amended
                         and Restated Credit Agreement]

                                       ROYAL BANK OF CANADA

                                       By:
                                          --------------------------------------
                                       Name:
                                            ------------------------------------
                                       Title:
                                             -----------------------------------

                                      S-17

<PAGE>   28

              [Signature page to Second Amendment to Second Amended
                         and Restated Credit Agreement]

                                       SOCIETE GENERALE, SOUTHWEST AGENCY

                                       By:
                                          --------------------------------------
                                       Name:
                                            ------------------------------------
                                       Title:
                                             -----------------------------------

                                      S-18

<PAGE>   29

              [Signature page to Second Amendment to Second Amended
                         and Restated Credit Agreement]

                                       WELLS FARGO BANK, N.A.

                                       By:
                                          --------------------------------------
                                       Name:
                                            ------------------------------------
                                       Title:
                                             -----------------------------------

                                      S-19
<PAGE>   30

              [Signature page to Second Amendment to Second Amended
                         and Restated Credit Agreement]

                                       BANK OF OKLAHOMA, N.A.

                                       By:
                                          --------------------------------------
                                       Name:
                                            ------------------------------------
                                       Title:
                                             -----------------------------------

                                      S-20
<PAGE>   31

              [Signature page to Second Amendment to Second Amended
                         and Restated Credit Agreement]

                                       COMMERCE BANK, N.A.

                                       By:
                                          --------------------------------------
                                       Name:
                                            ------------------------------------
                                       Title:
                                             -----------------------------------

                                      S-21
<PAGE>   32

              [Signature page to Second Amendment to Second Amended
                         and Restated Credit Agreement]

                                       CREDIT AGRICOLE INDOSUEZ

                                       By:
                                          --------------------------------------
                                       Name:
                                            ------------------------------------
                                       Title:
                                             -----------------------------------

                                       By:
                                          --------------------------------------
                                       Name:
                                            ------------------------------------
                                       Title:
                                             -----------------------------------

                                      S-22
<PAGE>   33

              [Signature page to Second Amendment to Second Amended
                         and Restated Credit Agreement]

                                       THE INDUSTRIAL BANK OF JAPAN, LIMITED,
                                       NEW YORK BRANCH

                                       By:
                                          --------------------------------------
                                       Name:
                                            ------------------------------------
                                       Title:
                                             -----------------------------------

                                      S-23
<PAGE>   34

              [Signature page to Second Amendment to Second Amended
                         and Restated Credit Agreement]

                                       THE BANK OF TOKYO-MITSUBISHI, LTD.

                                       By:
                                          --------------------------------------
                                       Name:
                                            ------------------------------------
                                       Title:
                                             -----------------------------------

                                      S-24
<PAGE>   35

              [Signature page to Second Amendment to Second Amended
                         and Restated Credit Agreement]

                                       UBS AG, STAMFORD BRANCH

                                       By:
                                          --------------------------------------
                                       Name:
                                            ------------------------------------
                                       Title:
                                             -----------------------------------

                                       By:
                                          --------------------------------------
                                       Name:
                                            ------------------------------------
                                       Title:
                                             -----------------------------------

                                      S-25<PAGE>   1
                                                                    EXHIBIT 4(o)

                       WILLIAMS HOLDINGS OF DELAWARE, INC.

                          THE WILLIAMS COMPANIES, INC.

                                       AND

                                 CITIBANK, N.A.

                                     TRUSTEE

                          FIRST SUPPLEMENTAL INDENTURE

                            DATED AS OF JULY 31, 1999

                     SUPPLEMENTING THE INDENTURE DATED AS OF
                                FEBRUARY 1, 1996

<PAGE>   2

                          FIRST SUPPLEMENTAL INDENTURE

         FIRST SUPPLEMENTAL INDENTURE (the "First Supplemental Indenture"),
dated as of July 31, 1999, by and among Williams Holdings of Delaware, Inc.
("WHD"), a Delaware corporation, The Williams Companies, Inc. ("TWC"), a
Delaware corporation, and Citibank, N.A., as Trustee (the "Trustee").

                                   WITNESSETH:

         WHEREAS, WHD and the Trustee entered into an Indenture dated as of
February 1, 1996 (the "Indenture"), pursuant to which Indenture WHD has issued
certain 6 1/4% Senior Debentures due 2006 and Medium-Term Notes (6.40%-6.91%)
due 1999-2002 (collectively, the "Notes"); and

         WHEREAS, pursuant to an Agreement and Plan of Merger dated as of July
31, 1999, by and between WHD and TWC, WHD has been merged into TWC; and

         WHEREAS, Section 9.1 of the Indenture permits the Trustee and WHD to
enter into indentures supplemental to evidence succession of another person to
WHD and the assumption by such successor of the covenants and obligations of WHD
under the Indenture.

         NOW, THEREFORE, for and in consideration of the premises and the mutual
covenants contained herein and in the Indenture and for other good and valuable
consideration, the receipt and sufficiency of which are hereby acknowledged,
WHD, TWC, and the Trustee hereby agree as follows:

         Section 1. Definitions. Capitalized terms, which are used but not
defined herein, shall have the meanings ascribed to such terms in the Indenture.

         Section 2. Assumption of Certain Obligations.

         (a) TWC hereby expressly assumes (i) the due and punctual payment of
the principal of, premium, if any, on, interest on, and any additional amounts
payable under the Indenture in respect of, the Notes, and (ii) the performance
of all of the covenants provided for in the Indenture to be performed or
observed by WHD.

         (b) WHD and the Trustee hereby acknowledge that TWC shall succeed to,
and be substituted for, and may exercise every right and power of, WHD under the
Indenture with the same effect as if TWC had been named therein.

         Section 3. Effect of First Supplemental Indenture. From and after the
execution and delivery of this First Supplemental Indenture, the Indenture shall
be deemed to be modified as herein provided, but except as modified hereby, the
Indenture
<PAGE>   3

shall continue in full force and effect. The Indenture as modified hereby shall
be read, taken, and construed as one and the same instrument.

         Section 4. Notice. Any notice or communication by the Trustee to TWC is
duly given if in writing and delivered in person or by express mail service to
the address set forth below:

                           The Williams Companies, Inc.
                           One Williams Center
                           Tulsa, Oklahoma  74172
                           Attention:   Treasurer

         Section 5. Governing Law. This First Supplemental Indenture shall be
governed by and construed in accordance with the laws of the State of New York
(regardless of the laws that might otherwise govern under applicable principles
of conflicts of laws) as to all matters, including, without limitation, matters
of validity, construction, effect, performance, and remedies.

         Section 6. Counterparts. This First Supplemental Indenture may be
executed in any number of counterparts, each of which, when so executed and
delivered, shall be an original, but such counterparts shall together constitute
but one and the same instrument.

         IN WITNESS WHEREOF, each of WHD, TWC, and the Trustee has caused this
First Supplemental Indenture to be executed on its behalf by its duly authorized
officer and has caused its official seal to be impressed hereon and attested by
one of its duly authorized officers, all as of the day and year first above
written.

[SEAL]                              WILLIAMS HOLDINGS OF DELAWARE, INC.

Attest

/s/ SHAWNA L. GEHRES                By: /s/ JAMES G. IVEY
------------------------------         ----------------------------------------
Name:  Shawna L. Gehres             Name:  James G. Ivey
Title: Secretary                    Title: Treasurer

[SEAL]                              THE WILLIAMS COMPANIES, INC.

Attest

/s/ SHAWNA L. GEHRES                By: /s/ JAMES G. IVEY
------------------------------         ----------------------------------------
Name:  Shawna L. Gehres             Name:  James G. Ivey
Title: Secretary                    Title: Treasurer

<PAGE>   4

[SEAL]                              CITIBANK, N.A., AS TRUSTEE

Attest

/s/ NANCY FORTE                     By: /s/ WAFAA ORFY
------------------------------         ----------------------------------------
Name:    Nancy Forte                Name:    Wafaa Orfy
Title:   Trust Officer              Title:   Assistant Vice President

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00004-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00004-of-00352.parquet"}]]