EXHIBIT 4.3 TRUST PREFERRED SECURITIES GUARANTEE AGREEMENT AGL Resources Inc. Dated as of May ___, 2001 TABLE OF CONTENTS (continued) Page ARTICLE I DEFINITIONS AND INTERPRETATION SECTION 1.1 Definitions and Interpretation.............................................. 1 ARTICLE II TRUST INDENTURE ACT SECTION 2.1 Trust Indenture Act; Application............................................ 5 SECTION 2.2 Lists of Holders of Securities.............................................. 5 SECTION 2.3 Reports by the Guarantee Trustee............................................ 5 SECTION 2.4 Periodic Reports to Guarantee Trustee....................................... 5 SECTION 2.5 Evidence of Compliance with Conditions Precedent............................ 6 SECTION 2.6 Events of Default; Waiver................................................... 6 SECTION 2.7 Event of Default; Notice.................................................... 6 SECTION 2.8 Conflicting Interests....................................................... 7 ARTICLE III POWERS, DUTIES AND RIGHTS OF GUARANTEE TRUSTEE SECTION 3.1 Powers and Duties of the Guarantee Trustee.................................. 7 SECTION 3.2 Certain Rights of Guarantee Trustee......................................... 8 SECTION 3.3 Not Responsible for Recitals or Issuance of Guarantee....................... 10 ARTICLE IV GUARANTEE TRUSTEE SECTION 4.1 Guarantee Trustee; Eligibility.............................................. 11 SECTION 4.2 Appointment, Removal and Resignation of Guarantee Trustee................... 11 ARTICLE V GUARANTEE SECTION 5.1 Guarantee................................................................... 12 SECTION 5.2 Waiver of Notice and Demand................................................. 12 SECTION 5.3 Obligations Not Affected.................................................... 12 SECTION 5.4 Rights of Holders........................................................... 13 SECTION 5.5 Guarantee of Payment........................................................ 14 SECTION 5.6 Subrogation................................................................. 14 SECTION 5.7 Independent Obligations..................................................... 14 -i- TABLE OF CONTENTS (continued) Page ARTICLE VI LIMITATION OF TRANSACTIONS; SUBORDINATION SECTION 6.1 Limitation of Transactions.................................................. 14 SECTION 6.2 Ranking..................................................................... 15 ARTICLE VII TERMINATION SECTION 7.1 Termination................................................................. 15 ARTICLE VIII COMPENSATION AND EXPENSES OF GUARANTEE TRUSTEE ARTICLE IX INDEMNIFICATION SECTION 9.1 Exculpation................................................................. 16 SECTION 9.2 Indemnification............................................................. 16 ARTICLE X MISCELLANEOUS SECTION 10.1 Successors and Assigns...................................................... 17 SECTION 10.2 Amendments.................................................................. 17 SECTION 10.3 Notices..................................................................... 17 SECTION 10.4 Benefit..................................................................... 18 SECTION 10.5 Governing Law............................................................... 18 -ii- TRUST PREFERRED SECURITIES GUARANTEE AGREEMENT This Trust Preferred Securities Guarantee Agreement (the "Guarantee"), dated as of May ___, 2001, is executed and delivered by AGL Resources Inc., a Georgia corporation (the "Guarantor"), and The Bank of New York, a New York banking corporation, as trustee (the "Guarantee Trustee"), for the benefit of the Holders (as defined herein) from time to time of the Trust Preferred Securities (as defined herein) of AGL Capital Trust II, a Delaware statutory business trust (the "Trust"). WHEREAS, pursuant to an Amended and Restated Trust Agreement (the "Trust Agreement"), dated as of May ___, 2001, among the trustees of the Trust, AGL Capital Corporation, as sponsor, and the holders from time to time of undivided beneficial interests in the assets of the Trust, the Trust is issuing on the date hereof preferred securities, having an aggregate liquidation amount of $150,000,000, such Trust Preferred Securities being designated the _____% Trust Preferred Securities (the "Trust Preferred Securities"). WHEREAS, as incentive for the Holders to purchase the Trust Preferred Securities, the Guarantor desires irrevocably and unconditionally to agree, to the extent set forth in this Guarantee, to pay to the Holders the Guarantee Payments (as defined below). The Guarantor agrees to make certain other payments on the terms and conditions set forth herein. NOW, THEREFORE, in consideration of the purchase by each Holder, which purchase the Guarantor hereby acknowledges shall benefit the Guarantor, the Guarantor executes and delivers this Guarantee for the benefit of the Holders. ARTICLE I DEFINITIONS AND INTERPRETATION SECTION 1.1 Definitions and Interpretation ------------------------------ In this Guarantee, unless the context otherwise requires: (a) Capitalized terms used in this Guarantee but not defined in the preamble above have the respective meanings assigned to them in this Section 1.1; (b) Terms defined in the Trust Agreement as of the date of execution of this Guarantee have the same meaning when used in this Guarantee; (c) a term defined anywhere in this Guarantee has the same meaning throughout; 1 (d) all references to "the Guarantee" or "this Guarantee" are to this Trust Preferred Securities Guarantee as modified, supplemented or amended from time to time; (e) all references in this Guarantee to Articles and Sections are to Articles and Sections of this Guarantee, unless otherwise specified; (f) a term defined in the Trust Indenture Act has the same meaning when used in this Guarantee, unless otherwise defined in this Guarantee or unless the context otherwise requires; and (g) a reference to the singular includes the plural and vice versa. "Affiliate" has the same meaning as given to that term in Rule 405 --------- under the Securities Act of 1933, as amended, or any successor rule thereunder. "Business Day" means any day other than a Saturday or a Sunday, or a ------------ day on which banking institutions in The City of New York are authorized or required by law or executive order to close. "Common Securities" means the securities representing common undivided ----------------- beneficial interests in the assets of the Trust. "Corporate Trust Office" means the office of the Guarantee Trustee at ---------------------- which the corporate trust business of the Guarantee Trustee shall, at any particular time, be principally administered, which office at the date of execution of this Guarantee is located at 101 Barclay Street, 21 West, New York, New York 10286. "Covered Person" means any Holder or beneficial owner of Trust -------------- Preferred Securities. "Debentures" means the series of subordinated debt securities of AGL ---------- Capital Corporation designated the ______% Junior Subordinated Deferrable Interest Debentures due _________ 1, 2041 held by the Property Trustee of the Trust. "Event of Default" means a default by the Guarantor on any of its ---------------- payment or other obligations under this Guarantee. "Guarantee Payments" means the following payments or distributions, ------------------ without duplication, with respect to the Trust Preferred Securities, to the extent not paid or made by the Trust: (i) any accumulated and unpaid Distributions (as defined in the Trust Agreement) that are required to be paid on such Trust Preferred Securities to the extent the Trust has funds on hand legally available therefor at such time, (ii) the redemption price, including all accumulated and unpaid Distributions to the date of redemption (the "Redemption Price") to the extent the Trust has funds on hand legally available therefor at such time, with respect to any Trust Preferred 2 Securities called for redemption by the Trust, and (iii) upon a voluntary or involuntary termination and liquidation of the Trust (other than in connection with the distribution of Debentures to the Holders in exchange for Trust Preferred Securities as provided in the Trust Agreement), the lesser of (a) the aggregate of the liquidation amount and all accumulated and unpaid Distributions on the Trust Preferred Securities to the date of payment, to the extent the Trust has funds on hand legally available therefor, and (b) the amount of assets of the Trust remaining available for distribution to Holders in liquidation of the Trust. "Guarantee Trustee" means The Bank of New York, a New York banking ----------------- corporation, until a Successor Guarantee Trustee has been appointed and has accepted such appointment pursuant to the terms of this Guarantee and thereafter means each such Successor Guarantee Trustee. "Holder" shall mean any holder, as registered on the books and records ------ of the Trust, of any Trust Preferred Securities; provided, however, that, in determining whether the holders of the requisite percentage of Trust Preferred Securities have given any request, notice, consent or waiver hereunder, "Holder" shall not include the Guarantor or any Affiliate of the Guarantor. "Indemnified Person" means the Guarantee Trustee, any Affiliate of the ------------------ Guarantee Trustee, or any officers, directors, shareholders, members, partners, employees, representatives, nominees, custodians or agents of the Guarantee Trustee. "Indenture" means the Indenture dated as of May ___, 2001, among AGL --------- Resources Inc., AGL Capital Corporation (the "Debenture Issuer") and The Bank of New York, as trustee (the "Property Trustee"), pursuant to which the Debentures are to be issued to the Property Trustee of the Trust. "Indenture Event of Default" shall mean any event specified in Section -------------------------- 5.01 of the Indenture. "Majority in liquidation amount of the Trust Preferred Securities" ---------------------------------------------------------------- means, except as provided by the Trust Indenture Act, a vote by Holder(s) of more than 50% of the aggregate liquidation amount (including the stated amount that would be paid on redemption, liquidation or otherwise, plus accumulated and unpaid Distributions to the date upon which the voting percentages are determined) of all Trust Preferred Securities. "Officer's Certificate" means, with respect to any person, a --------------------- certificate signed by the Chairman, the Chief Executive Officer, the President, a Vice President, the Controller, the Secretary or an Assistant Secretary, the Treasurer or an Assistant Treasurer of the Guarantor. Any Officers' Certificate delivered with respect to compliance with a condition or covenant provided for in this Guarantee shall include: (a) a statement that each officer signing the Officers' Certificate has read the covenant or condition and the definitions relating thereto; 3 (b) a statement that each such officer has made such examination or investigation as, in such officer's opinion, is necessary to enable such officer to express an informed opinion as to whether or not such covenant or condition has been complied with; and (c) a statement as to whether, in the opinion of each such officer, such condition or covenant has been complied with. "Other Debentures" means all junior subordinated debentures issued by ---------------- the Guarantor or the Company from time to time and sold to trusts to be established by the Guarantor or the Company (if any), in each case similar to the Trust. "Other Guarantees" means all guarantees to be issued by the Guarantor ---------------- with respect to Trust Preferred Securities (if any) similar to the Trust Preferred Securities issued by other trusts to be established by the Guarantor or the Company (if any), in each case similar to the Trust. "Person" means a legal person, including any individual, corporation, ------ estate, partnership, joint venture, association, joint stock company, limited liability company, trust, unincorporated association, or government or any agency or political subdivision thereof, or any other entity of whatever nature. "Redemption Price" has the meaning provided therefor in the definition ---------------- of Guarantee Payments. "Responsible Officer" shall mean, when used with respect to the ------------------- Guarantee Trustee, any officer within the corporate trust office of the Guarantee Trustee, including any vice-president, any assistant vice-president, assistant secretary, assistant treasurer, trust officer or any other officer of the Guarantee Trustee who customarily performs functions similar to those performed by the Person who at the time shall be such officer, respectively, or to whom any corporate trust matter is referred because of such person's knowledge of and familiarity with the particular subject and who shall have direct responsibility for the administration of the Trust. "Successor Guarantee Trustee" means a successor Guarantee Trustee --------------------------- possessing the qualifications to act as Guarantee Trustee under Section 4.1. "Trust Indenture Act" means the Trust Indenture Act of 1939, as ------------------- amended. "Trust Securities" means the Common Securities and the Trust Preferred ---------------- Securities, collectively. 4 ARTICLE II TRUST INDENTURE ACT SECTION 2.1 Trust Indenture Act; Application -------------------------------- (a) This Guarantee is subject to the provisions of the Trust Indenture Act that are required to be part of this Guarantee and shall, to the extent applicable, be governed by such provisions; and (b) if and to the extent that any provision of this Guarantee limits, qualifies or conflicts with the duties imposed by Section 310 to 317, inclusive, of the Trust Indenture Act, such imposed duties shall control. SECTION 2.2 Lists of Holders of Securities ------------------------------ (a) The Guarantor shall provide the Guarantee Trustee (unless the Guarantee Trustee is otherwise the registrar of the Trust Preferred Securities) with a list, in such form as the Guarantee Trustee may reasonably require, of the names and addresses of the Holders ("List of Holders") as of such date, (i) not more than 15 days after each record date for payment of Distributions, and (ii) at any other time within 30 days of receipt by the Guarantor of a written request for a List of Holders as of a date not more than 15 days before such List of Holders is given to the Guarantee Trustee provided, that the Guarantor -------- shall not be obligated to provide such List of Holders at any time the List of Holders does not differ from the most recent List of Holders given to the Guarantee Trustee by the Guarantor. The Guarantee Trustee may destroy any List of Holders previously given to it on receipt of a new List of Holders. (b) The Guarantee Trustee shall comply with its obligations under Sections 311(a), 311(b) and Section 312(b) of the Trust Indenture Act. SECTION 2.3 Reports by the Guarantee Trustee -------------------------------- Within 60 days after July 15 of each year, commencing July 15, 2002, the Guarantee Trustee shall provide to the Holders such reports as are required by Section 313(a) of the Trust Indenture Act, if any, in the form and in the manner provided by Section 313 of the Trust Indenture Act. The Guarantee Trustee shall also comply with the other requirements of Section 313 of the Trust Indenture Act. SECTION 2.4 Periodic Reports to Guarantee Trustee ------------------------------------- The Guarantor shall provide to the Guarantee Trustee such documents, reports and information as required by Section 314 (if any) and the compliance certificate required by Section 314 of the Trust Indenture Act in the form, in the manner and at the times required by Section 314 of the Trust Indenture Act provided that such compliance certificate shall be delivered on or before 120 days after the end of each fiscal year of the Guarantor. Delivery of such reports, information and documents to the Guarantee Trustee is for informational purposes 5 only and the Guarantee Trustee's receipt of such shall not constitute constructive notice of any information contained therein or determinable from information contained therein, including the Guarantor's compliance with any of its covenants hereunder (as to which the Guarantee Trustee is entitled to rely exclusively on Officers' Certificates). Delivery of such reports, information and documents to the Trustee is for informational purposes only and the Trustee's receipt of such shall not constitute constructive notice of any information contained therein or determinable from information contained therein, including the Trust's compliance with any of its covenants hereunder (as to which the Trustee is entitled to rely exclusively on Officer's Certificates). SECTION 2.5 Evidence of Compliance with Conditions Precedent ------------------------------------------------ The Guarantor shall provide to the Guarantee Trustee such evidence of compliance with any conditions precedent, if any, provided for in this Guarantee that relate to any of the matters set forth in Section 314(c) of the Trust Indenture Act. Any certificate or opinion required to be given by an officer pursuant to Section 314(c)(1) may be given in the form of an Officers' Certificate. SECTION 2.6 Events of Default; Waiver ------------------------- The Holders of a Majority in liquidation amount of Trust Preferred Securities may, by vote, on behalf of all the Holders, waive any past Event of Default and its consequences. Upon such waiver, any such Event of Default shall cease to exist, and any Event of Default arising therefrom shall be deemed to have been cured, for every purpose of this Guarantee, but no such waiver shall extend to any subsequent or other default or Event of Default or impair any right consequent thereon. SECTION 2.7 Event of Default; Notice ------------------------ (a) The Guarantee Trustee shall, within 90 days after the occurrence of a default with respect to this Guarantee, mail by first class postage prepaid, to all Holders, notices of all defaults actually known to a Responsible Officer of the Guarantee Trustee, unless such defaults have been cured before the giving of such notice, provided, that, except in the case of default in the payment of any Guarantee Payment, the Guarantee Trustee shall be protected in withholding such notice if and so long as the board of directors, the executive committee, or a trust committee of directors and/or Responsible Officers of the Guarantee Trustee in good faith determines that the withholding of such notice is in the interests of the holders of the Trust Preferred Securities. (b) The Guarantee Trustee shall not be deemed to have knowledge of any Event of Default unless the Guarantee Trustee shall have received written notice from the Guarantor or a Holder, or a Responsible Officer of the Guarantee Trustee charged with the administration of the Trust Agreement shall have obtained actual knowledge, of such Event of Default. 6 SECTION 2.8 Conflicting Interests --------------------- The Trust Agreement shall be deemed to be specifically described in this Guarantee for the purposes of clause (i) of the first proviso contained in Section 310(b) of the Trust Indenture Act. ARTICLE III POWERS, DUTIES AND RIGHTS OF GUARANTEE TRUSTEE SECTION 3.1 Powers and Duties of the Guarantee Trustee ------------------------------------------ (a) This Guarantee shall be held by the Guarantee Trustee for the benefit of the Holders, and the Guarantee Trustee shall not transfer this Guarantee to any Person except a Holder exercising his or her rights pursuant to Section 5.4(b) or to a Successor Guarantee Trustee on acceptance by such Successor Guarantee Trustee of its appointment to act as Successor Guarantee Trustee. The right, title and interest of the Guarantee Trustee shall automatically vest in any Successor Guarantee Trustee, and such vesting and succession of title shall be effective whether or not conveyancing documents have been executed and delivered pursuant to the appointment of such Successor Guarantee Trustee. (b) If an Event of Default actually known to a Responsible Officer of the Guarantee Trustee has occurred and is continuing, the Guarantee Trustee shall enforce this Guarantee for the benefit of the Holders. (c) The Guarantee Trustee, before the occurrence of any Event of Default and after the curing of all Events of Default that may have occurred, shall undertake to perform only such duties as are specifically set forth in this Guarantee, and no implied covenants shall be read into this Guarantee against the Guarantee Trustee. In case an Event of Default has occurred (that has not been cured or waived pursuant to Section 2.6) and is actually known to a Responsible Officer of the Guarantee Trustee, the Guarantee Trustee shall exercise such of the rights and powers vested in it by this Guarantee, and use the same degree of care and skill in its exercise thereof, as a prudent person would exercise or use under the circumstances in the conduct of his or her own affairs. (d) No provision of this Guarantee shall be construed to relieve the Guarantee Trustee from liability for its own negligent action, its own negligent failure to act, or its own willful misconduct, except that: (i) prior to the occurrence of any Event of Default and after the curing or waiving of all such Events of Default that may have occurred: (A) the duties and obligations of the Guarantee Trustee shall be determined solely by the express provisions of this Guarantee, and the Guarantee Trustee shall not be liable except for the performance of such duties and obligations as are specifically set forth in this Guarantee, and no implied 7 covenants or obligations shall be read into this Guarantee against the Guarantee Trustee; and (B) in the absence of bad faith on the part of the Guarantee Trustee, the Guarantee Trustee may conclusively rely, as to the truth of the statements and the correctness of the opinions expressed therein, upon any certificates or opinions furnished to the Guarantee Trustee and conforming to the requirements of this Guarantee; but in the case of any such certificates or opinions that by any provision hereof are specifically required to be furnished to the Guarantee Trustee, the Guarantee Trustee shall be under a duty to examine the same to determine whether or not they conform to the requirements of this Guarantee. The Trustee shall not be bound to make any investigation into the facts or matters stated in any resolution, certificate, statement, instrument, opinion, report, notice, request, direction, consent, order, bond, debenture, note, other evidence of indebtedness or other paper or document, but the Trustee, in its discretion, may make such further inquiry or investigation into such facts or matters as it may see fit, and, if the Trustee shall determine to make such further inquiry or investigation, it shall be entitled to examine the books, records and premises of the Guarantor, personally or by agent or attorney at the sole cost of the Guarantor and shall incur no liability or additional liability of any kind by reason of such inquiry or investigation; (ii) the Guarantee Trustee shall not be liable for any error of judgment made in good faith by a Responsible Officer of the Guarantee Trustee, unless it shall be proved that the Guarantee Trustee was negligent in ascertaining the pertinent facts upon which such judgment was made; (iii) the Guarantee Trustee shall not be liable with respect to any action taken or omitted to be taken by it in good faith in accordance with the direction of the Holders of a Majority in liquidation amount of the Trust Preferred Securities relating to the time, method and place of conducting any proceeding for any remedy available to the Guarantee Trustee, or exercising any trust or power conferred upon the Guarantee Trustee under this Guarantee; and (iv) no provision of this Guarantee shall require the Guarantee Trustee to expend or risk its own funds or otherwise incur personal financial liability in the performance of any of its duties or in the exercise of any of its rights or powers, if the Guarantee Trustee shall have reasonable grounds for believing that the repayment of such funds or liability is not reasonably assured to it under the terms of this Guarantee or indemnity, reasonably satisfactory to the Guarantee Trustee, against such risk or liability is not reasonably assured to it. SECTION 3.2 Certain Rights of Guarantee Trustee ----------------------------------- (a) Subject to the provisions of Section 3.1: 8 (i) The Guarantee Trustee may conclusively rely, and shall be fully protected in acting or refraining from acting, upon any resolution, certificate, statement, instrument, opinion, report, notice, request, direction, consent, order, bond, debenture, note, other evidence of indebtedness or other paper or document believed by it to be genuine and to have been signed, sent or presented by the proper party or parties. (ii) Any direction or act of the Guarantor contemplated by this Guarantee may be sufficiently evidenced by an Officers' Certificate. (iii) Whenever, in the administration of this Guarantee, the Guarantee Trustee shall deem it desirable that a matter be proved or established before taking, suffering or omitting any action hereunder, the Guarantee Trustee (unless other evidence is herein specifically prescribed) may, in the absence of bad faith on its part, request and conclusively rely upon an Officers' Certificate which, upon receipt of such request, shall be promptly delivered by the Guarantor. (iv) The Guarantee Trustee shall have no duty to see to any recording, filing or registration of any instrument (or any rerecording, refiling or registration thereof). (v) The Guarantee Trustee may consult with counsel of its selection, and the advice or opinion of such counsel with respect to legal matters shall be full and complete authorization and protection in respect of any action taken, suffered or omitted by it hereunder in good faith and in accordance with such advice or opinion. Such counsel may be counsel to the Guarantor or any of its Affiliates and may include any of its employees. The Guarantee Trustee shall have the right at any time to seek instructions concerning the administration of this Guarantee from any court of competent jurisdiction. (vi) The Guarantee Trustee shall be under no obligation to exercise any of the rights or powers vested in it by this Guarantee at the request or direction of any Holder, unless such Holder shall have provided to the Guarantee Trustee such security and indemnity, reasonably satisfactory to the Guarantee Trustee, against the costs, expenses (including attorneys' fees and expenses and the expenses of the Guarantee Trustee's agents, nominees or custodians) and liabilities that might be incurred by it in complying with such request or direction, including such reasonable advances as may be requested by the Guarantee Trustee; provided that, nothing contained in this Section 3.2(a)(vi) shall be taken to relieve the Guarantee Trustee, upon the occurrence of an Event of Default, of its obligation to exercise the rights and powers vested in it by this Guarantee. (vii) The Guarantee Trustee shall not be bound to make any investigation into the facts or matters stated in any resolution, certificate, statement, instrument, opinion, report, notice, request, direction, consent, order, bond, debenture, note, other evidence of indebtedness or other paper or document, but the Guarantee Trustee, in its discretion, may make such further inquiry or investigation into such facts or matters as it may see fit. 9 (viii) The Guarantee Trustee may execute any of the trusts or powers hereunder or perform any duties hereunder either directly or by or through agents, nominees, custodians or attorneys, and the Guarantee Trustee shall not be responsible for any misconduct or negligence on the part of any agent or attorney appointed with due care by it hereunder. (ix) Any action taken by the Guarantee Trustee or its agents hereunder shall bind the Holders, and the signature of the Guarantee Trustee or its agents alone shall be sufficient and effective to perform any such action. No third party shall be required to inquire as to the authority of the Guarantee Trustee to so act or as to its compliance with any of the terms and provisions of this Guarantee, both of which shall be conclusively evidenced by the Guarantee Trustee's or its agent's taking such action. (x) Whenever in the administration of this Guarantee the Guarantee Trustee shall deem it desirable to receive instructions with respect to enforcing any remedy or right or taking any other action hereunder, the Guarantee Trustee (i) may request instructions from the Holders of a Majority in liquidation amount of the Trust Preferred Securities, (ii) may refrain from enforcing such remedy or right or taking such other action until such instructions are received, and (iii) shall be protected in conclusively relying on or acting in accordance with such instructions. (xi) The Guarantee Trustee shall not be liable for any action taken, suffered, or omitted to be taken by it in good faith, without negligence, and reasonably believed by it to be authorized or within the discretion or rights or powers conferred upon it by this Guarantee. (b) No provision of this Guarantee shall be deemed to impose any duty or obligation on the Guarantee Trustee to perform any act or acts or exercise any right, power, duty or obligation conferred or imposed on it in any jurisdiction in which it shall be illegal, or in which the Guarantee Trustee shall be unqualified or incompetent in accordance with applicable law, to perform any such act or acts or to exercise any such right, power, duty or obligation. No permissive power or authority available to the Guarantee Trustee shall be construed to be a duty. (c) Whether or not therein expressly so provided, every provision of this Guarantee relating to the conduct or affecting the liability of or affording protection to the Guarantee Trustee shall be subject to the provisions of this Section. SECTION 3.3 Not Responsible for Recitals or Issuance of Guarantee ----------------------------------------------------- The recitals contained in this Guarantee shall be taken as the statements of the Guarantor, and the Guarantee Trustee does not assume any responsibility for their correctness. The Guarantee Trustee makes no representation as to the validity or sufficiency of this Guarantee. 10 ARTICLE IV GUARANTEE TRUSTEE SECTION 4.1 Guarantee Trustee; Eligibility ------------------------------ (a) There shall at all times be a Guarantee Trustee which shall: (i) not be an Affiliate of the Guarantor; and (ii) be a corporation organized and doing business under the laws of the United States of America or any State or Territory thereof or of the District of Columbia, or a corporation or Person permitted by the Securities and Exchange Commission to act as an institutional trustee under the Trust Indenture Act, authorized under such laws to exercise corporate trust powers, having a combined capital and surplus of at least 50 million U.S. dollars ($50,000,000), and subject to supervision or examination by Federal, State, Territorial or District of Columbia authority. If such corporation publishes reports of condition at least annually, pursuant to law or to the requirements of the supervising or examining authority referred to above, then, for the purposes of this Section 4.1(a)(ii), the combined capital and surplus of such corporation shall be deemed to be its combined capital and surplus as set forth in its most recent report of condition so published. (b) If at any time the Guarantee Trustee shall cease to be eligible to so act under Section 4.1(a), the Guarantee Trustee shall immediately resign in the manner and with the effect set out in Section 4.2(c). (c) If the Guarantee Trustee has or shall acquire any "conflicting interest" within the meaning of Section 310(b) of the Trust Indenture Act, the Guarantee Trustee and Guarantor shall in all respects comply with the provisions of Section 310(b) of the Trust Indenture Act, subject to the penultimate paragraph thereof. SECTION 4.2 Appointment, Removal and Resignation of Guarantee Trustee --------------------------------------------------------- (a) Subject to Section 4.2(b), the Guarantee Trustee may be appointed or removed without cause at any time by the Guarantor except during an Event of Default. (b) The Guarantee Trustee shall not be removed in accordance with Section 4.2(a) until a Successor Guarantee Trustee has been appointed and has accepted such appointment by written instrument executed by such Successor Guarantee Trustee and delivered to the Guarantor. (c) The Guarantee Trustee shall hold office until a Successor Guarantee Trustee shall have been appointed or until its removal or resignation. The Guarantee Trustee may resign from office (without need for prior or subsequent accounting) by an instrument in writing executed by the Guarantee Trustee and delivered to the Guarantor, which resignation shall not take effect until a Successor Guarantee Trustee has been appointed and has accepted 11 such appointment by instrument in writing executed by such Successor Guarantee Trustee and delivered to the Guarantor and the resigning Guarantee Trustee. (d) If no Successor Guarantee Trustee shall have been appointed and accepted appointment as provided in this Section 4.2 within 60 days after delivery of an instrument of removal or resignation, the Guarantee Trustee resigning or being removed may petition any court of competent jurisdiction for appointment of a Successor Guarantee Trustee. Such court may thereupon, after prescribing such notice, if any, as it may deem proper, appoint a Successor Guarantee Trustee. (e) No Guarantee Trustee shall be liable for the acts or omissions to act of any Successor Guarantee Trustee. (f) Upon termination of this Guarantee or removal or resignation of the Guarantee Trustee pursuant to this Section 4.2, the Guarantor shall pay to the Guarantee Trustee all amounts due to the Guarantee Trustee accrued to the date of such termination, removal or resignation. ARTICLE V GUARANTEE SECTION 5.1 Guarantee --------- The Guarantor irrevocably and unconditionally agrees to pay in full to the Holders the Guarantee Payments (without duplication of amounts theretofore paid by the Trust), as and when due, regardless of any defense, right of set-off or counterclaim that the Trust may have or assert. The Guarantor's obligation to make a Guarantee Payment may be satisfied by direct payment of the required amounts by the Guarantor to the Holders or by causing the Trust to pay such amounts to the Holders. SECTION 5.2 Waiver of Notice and Demand --------------------------- The Guarantor hereby waives notice of acceptance of this Guarantee and of any liability to which it applies or may apply, presentment, demand for payment, any right to require a proceeding first against the Trust or any other Person before proceeding against the Guarantor, protest, notice of nonpayment, notice of dishonor, notice of redemption and all other notices and demands. SECTION 5.3 Obligations Not Affected ------------------------ The obligations, covenants, agreements and duties of the Guarantor under this Guarantee shall in no way be affected or impaired by reason of the happening from time to time of any of the following: 12 (a) the release or waiver, by operation of law or otherwise, of the performance or observance by the Trust of any express or implied agreement, covenant, term or condition relating to the Trust Preferred Securities to be performed or observed by the Trust; (b) the extension of time for the payment by the Trust of all or any portion of the Distributions, Redemption Price, Liquidation Distribution or any other sums payable under the terms of the Trust Preferred Securities or the extension of time for the performance of any other obligation under, arising out of, or in connection with, the Trust Preferred Securities (other than an extension of time for payment of Distributions, Redemption Price, Liquidation Distribution or other sum payable that results from the extension of any interest payment period on the Debentures permitted by the Indenture); (c) any failure, omission, delay or lack of diligence on the part of the Holders to enforce, assert or exercise any right, privilege, power or remedy conferred on the Holders pursuant to the terms of the Trust Preferred Securities, or any action on the part of the Trust granting indulgence or extension of any kind; (d) the voluntary or involuntary liquidation, dissolution, sale of any collateral, receivership, insolvency, bankruptcy, assignment for the benefit of creditors, reorganization, arrangement, composition or readjustment of debt of, or other similar proceedings affecting, the Trust or any of the assets of the Trust; (e) any invalidity of, or defect or deficiency in, the Trust Preferred Securities; (f) the settlement or compromise of any obligation guaranteed hereby or hereby incurred; or (g) any other circumstance whatsoever that might otherwise constitute a legal or equitable discharge or defense of a guarantor, it being the intent of this Section 5.3 that the obligations of the Guarantor with respect to the Guarantee Payments shall be absolute and unconditional under any and all circumstances. There shall be no obligation of the Holders to give notice to, or obtain consent of, the Guarantor with respect to the happening of any of the foregoing. SECTION 5.4 Rights of Holders ----------------- (a) The Holders of a Majority in liquidation amount of the Trust Preferred Securities have the right to direct the time, method and place of conducting any proceeding for any remedy available to the Guarantee Trustee in respect of this Guarantee or exercising any trust or power conferred upon the Guarantee Trustee under this Guarantee. (b) Any Holder may institute a legal proceeding directly against the Guarantor to enforce the Guarantee Trustee's rights under this Guarantee, without first instituting a legal proceeding against the Trust, the Guarantee Trustee or any other person or entity. 13 SECTION 5.5 Guarantee of Payment -------------------- This Guarantee creates a guarantee of payment and not of collection. SECTION 5.6 Subrogation ----------- The Guarantor shall be subrogated to all (if any) rights of the Holders against the Trust in respect of any amounts paid to such Holders by the Guarantor under this Guarantee; provided, however, that the Guarantor shall not (except to the extent required by mandatory provisions of law) be entitled to enforce or exercise any right that it may acquire by way of subrogation or any indemnity, reimbursement or other agreement, in all cases as a result of payment under this Guarantee, if, at the time of any such payment, any amounts are due and unpaid under this Guarantee. If any amount shall be paid to the Guarantor in violation of the preceding sentence, the Guarantor agrees to hold such amount in trust for the Holders and to pay over such amount to the Holders. SECTION 5.7 Independent Obligations ----------------------- The Guarantor acknowledges that its obligations hereunder are independent of the obligations of the Trust with respect to the Trust Preferred Securities, and that the Guarantor shall be liable as principal and as debtor hereunder to make Guarantee Payments pursuant to the terms of this Guarantee notwithstanding the occurrence of any event referred to in subsections (a) through (h), inclusive, of Section 5.3 hereof. ARTICLE VI LIMITATION OF TRANSACTIONS; SUBORDINATION SECTION 6.1 Limitation of Transactions -------------------------- So long as any Trust Preferred Securities remain outstanding, the Guarantor shall not (i) declare or pay any dividends or distributions on, or redeem, purchase, acquire or make a liquidation payment with respect to, any of the Guarantor's capital stock (which includes common and preferred stock) or (ii) make any payment of principal of or premium, if any, or interest on or repay, repurchase or redeem any debt securities of the Guarantor (including Other Debentures) that rank pari passu with or junior in right of payment to the Debentures or (iii) make any guarantee payments with respect to any guarantee by the Guarantor of the debt securities of any subsidiary of the Guarantor (including Other Guarantees) if such guarantee ranks pari passu with or junior in right of payment to the Debentures (other than (a) dividends or distributions in shares of, or options, warrants, rights to subscribe for or purchase shares of, common stock of the Guarantor, (b) any declaration of a dividend in connection with the implementation of a stockholders' rights plan, or the issuance of stock under any such plan in the future, or the redemption or repurchase of any such rights pursuant thereto, (c) payments under the Guarantee, (d) the purchase of fractional shares resulting from a reclassification of the Guarantor's capital stock, (e) the exchange or the conversion of one class, or series of the Guarantor's capital stock for another class or series of the Guarantor's capital stock, and (f) the 14 purchase of fractional interests in shares of the Guarantor's capital stock pursuant to the conversion or exchange provisions of such capital stock or the security being converted or exchanged) if at such time (1) there shall have occurred and be continuing an event of default under the Trust Agreement, (2) there shall have occurred and be continuing an Event of Default under the Indenture, (3) there shall have occurred and be continuing a payment default under the Trust Agreement or the Indenture, (4) if the Debentures are held by the Trust, the Guarantor shall be in default with respect to its payment of any obligations under this Guarantee, or (5) the Guarantor shall have given notice of its election of an Extended Interest Payment Period (as defined in the Indenture) and shall not have rescinded such notice, and such Extended Interest Payment Period, or any extension thereof, shall have commenced. SECTION 6.2 Ranking ------- This Guarantee will constitute an unsecured obligation of the Guarantor and will rank (i) subordinate and junior in right of payment to Senior Indebtedness (as defined in the Indenture assuming the Guarantor is an "obligor" as described therein, the term "Securities" means the Guarantee and the term "Company" means the Guarantor), to the same extent and in the same manner that the Debentures are subordinated to Senior Indebtedness pursuant to the Indenture, it being understood that the terms of Article XV of the Indenture shall apply to the obligations of the Guarantor under this Guarantee as if (x) such Article XV were set forth herein in full and (y) such obligations were substituted for the term "Securities" appearing in such Article XV, (ii) pari passu with the Debentures, the Other Debentures and with the most senior preferred or preference stock now or hereafter issued by the Guarantor and with any Other Guarantee (as defined herein) and any guarantee now or hereafter entered into by the Guarantor in respect of any preferred or preference stock of any Affiliate of the Guarantor, and (iii) senior to the Guarantor's common stock. ARTICLE VII TERMINATION SECTION 7.1 Termination ----------- This Guarantee shall terminate (i) upon full payment of the Redemption Price of all Trust Preferred Securities, (ii) upon the full payment of the amounts payable in accordance with the Trust Agreement, or (iii) the distribution of the Debentures to the Holders of all of the Trust Preferred Securities. Notwithstanding the foregoing, this Guarantee will continue to be effective or will be reinstated, as the case may be, if at any time any Holder must restore payment of any sums paid under the Trust Preferred Securities or under this Guarantee. ARTICLE VIII COMPENSATION AND EXPENSES OF GUARANTEE TRUSTEE The Guarantor covenants and agrees to pay to the Guarantee Trustee from time to time, and the Guarantee Trustee shall be entitled to, such compensation as shall be agreed to in writing between the Guarantor and the Guarantee Trustee (which shall not be limited by any provision of law in regard to the compensation of a trustee of an express trust), and the Guarantor will pay or reimburse the Guarantee Trustee upon its request for all reasonable expenses, 15 disbursements and advances incurred or made by the Guarantee Trustee in accordance with any of the provisions of this Guarantee (including the reasonable compensation and the expenses and disbursements of its counsel and of all persons not regularly in its employ) except any such expense, disbursement or advance as may arise from its negligence or bad faith. The Guarantor also covenants to indemnify each of the Guarantee Trustee (and its officers, agents, directors and employees) for, and to hold it harmless against, any and all loss, damage, claim, liability or expense including taxes (other than taxes based on the income of the Guarantee Trustee) incurred without negligence or bad faith on the part of the Guarantee Trustee and arising out of or in connection with the acceptance or administration of this guarantee, including the costs and expenses of defending itself against any claim of liability in the premises. The obligations of the Guarantor under this Article VIII to compensate and indemnify the Guarantee Trustee and to pay or reimburse the Guarantee Trustee for expenses, disbursements and advances shall be secured by a lien prior to that of the Trust Preferred Securities upon all property and funds held or collected by the Guarantee Trustee as such, except funds held in trust for the benefit of the holders of particular Trust Preferred Securities. The provisions of this Article shall survive the termination of this Guarantee. ARTICLE IX INDEMNIFICATION SECTION 9.1 Exculpation ----------- (a) No Indemnified Person shall be liable, responsible or accountable in damages or otherwise to the Guarantor or any Covered Person for any loss, damage or claim incurred by reason of any act or omission performed or omitted by such Indemnified Person in good faith in accordance with this Guarantee and in a manner that such Indemnified Person reasonably believed to be within the scope of the authority conferred on such Indemnified Person by this Guarantee or by law, except that an Indemnified Person shall be liable for any such loss, damage or claim incurred by reason of such Indemnified Person's negligence or willful misconduct with respect to such acts or omissions. (b) An Indemnified Person shall be fully protected in relying in good faith upon the records of the Guarantor and upon such information, opinions, reports or statements presented to the Guarantor by any Person as to matters the Indemnified Person reasonably believes are within such other Person's professional or expert competence and who has been selected with reasonable care by or on behalf of the Guarantor, including information, opinions, reports or statements as to the value and amount of the assets, liabilities, profits, losses, or any other facts pertinent to the existence and amount of assets from which Distributions to Holders might properly be paid. SECTION 9.2 Indemnification --------------- The Guarantor agrees to indemnify each Indemnified Person for, and to hold each Indemnified Person harmless against, any and all loss, liability, damage, claim or expense 16 incurred without negligence or bad faith on its part, arising out of or in connection with the acceptance or administration of the trust or trusts hereunder, including the costs and expenses (including reasonable legal fees and expenses) of defending itself against, or investigating, any claim or liability in connection with the exercise or performance of any of its powers or duties hereunder. The obligation to indemnify as set forth in this Section 9.2 shall survive the termination of this Guarantee. ARTICLE X MISCELLANEOUS SECTION 10.1 Successors and Assigns ---------------------- All guarantees and agreements contained in this Guarantee shall bind the successors, assigns, receivers, trustees and representatives of the Guarantor and shall inure to the benefit of the Holders then outstanding. SECTION 10.2 Amendments ---------- Except with respect to any changes that do not materially adversely affect the rights of Holders (in which case no consent of Holders will be required), this Guarantee may only be amended with the prior approval of the Holders of a Majority in liquidation amount of the Securities (including the stated amount that would be paid on redemption, liquidation or otherwise, plus accrued and unpaid Distributions to the date upon which the voting percentages are determined). The provisions of the Trust Agreement with respect to consents to amendments thereof (whether at a meeting or otherwise) shall apply to the giving of such approval. SECTION 10.3 Notices ------- All notices provided for in this Guarantee shall be in writing, duly signed by the party giving such notice, and shall be delivered, telecopied or mailed by first class mail, as follows: (a) If given to the Trust, in care of the Administrative Trustee at the Trust's mailing address set forth below (or such other address as the Trust may give notice of to the Holders and the Guarantee Trustee): AGL Capital Trust II c/o AGL Capital Corporation 2325-B Renaissance Drive Las Vegas, Nevada 89119 Attention: Paul R. Shlanta (b) If given to the Guarantee Trustee, at the Guarantee Trustee's mailing address set forth below (or such other address as the Guarantee Trustee may give notice of to the Holders and the Trust): 17 The Bank of New York 101 Barclay Street, 21 West New York, New York 10286 Attention: Corporate Trust Trustee Administration (c) If given to the Guarantor, at the Guarantor's mailing address set forth below (or such other address as the Guarantor may give notice of to the Holders of the Trust Preferred Securities and the Guarantee Trustee): AGL Resources Inc. 817 West Peachtree Street, N.W. Atlanta, Georgia 30308 Attention: Richard T. O'Brien (d) If given to any Holder of Trust Preferred Securities, at the address set forth on the books and records of the Trust. All such notices shall be deemed to have been given when received in person, telecopied with receipt confirmed, or mailed by first class mail, postage prepaid except that if a notice or other document is refused delivery or cannot be delivered because of a changed address of which no notice was given, such notice or other document shall be deemed to have been delivered on the date of such refusal or inability to deliver. SECTION 10.4 Benefit ------- This Guarantee is solely for the benefit of the Holders and, subject to Section 3.1(a), is not separately transferable from the Trust Preferred Securities. SECTION 10.5 Governing Law ------------- THIS GUARANTEE SHALL BE GOVERNED BY, AND CONSTRUED AND INTERPRETED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK, WITHOUT REGARD TO CONFLICTS OF LAWS PRINCIPLES THEREOF. 18 THIS GUARANTEE is executed as of the day and year first above written. AGL RESOURCES INC., as Guarantor By:____________________________________________________ Name: Donald P. Weinstein Title: Senior Vice President and Chief Financial Officer THE BANK OF NEW YORK, as Guarantee Trustee By:____________________________________________________ Name: Title: 19