EXHIBIT 5.1

                                  May 3, 2001


AGL Resources Inc.
817 West Peachtree Street, N.W.
Atlanta, Georgia  30308

     Re:  Registration Statement on Form S-3 of AGL Resources Inc., AGL Capital
          Corporation and AGL Capital Trust II

Ladies and Gentlemen:

     We have acted as counsel to AGL Resources Inc., a Georgia corporation ("AGL
Resources"), in connection with a Registration Statement on Form S-3 (the
"Registration Statement") and the filing thereof with the Securities and
Exchange Commission (the "Commission"), by AGL Resources, AGL Capital
Corporation ("AGL Capital") and AGL Capital Trust II (the "Trust"). Pursuant to
the Registration Statement, AGL Resources, AGL Capital and the Trust intend to
register under the Securities Act of 1933, as amended, (i) 6,000,000 of the
Trust's ___% Trust Preferred Securities, Liquidation Amount $25 per Preferred
Security (the "Preferred Securities"), (ii) $150,000,000 aggregate principal
amount of AGL Capital's ___% Junior Subordinated Debentures due 2041 (the
"Debentures") with AGL Resources as Guarantor under the Indenture to be entered
into by and among AGL Resources, AGL Capital and The Bank of New York, as
Trustee, and (iii) AGL Resources' guarantee of cash distributions and payments
on liquidation of the Trust or redemption of the Preferred Securities (the
"Guarantee").

     Our Opinion (as defined below) is furnished solely with regard to the
Registration Statement, pursuant to Item 16 of Form S-3 and Item 601(b)(5) of
Regulation S-K, may be relied upon only in connection with the Registration
Statement and may not otherwise be used, quoted or referred to by or filed with
any other person or entity without our prior written permission.  The only
opinion rendered consists of the matter set forth in numbered paragraph (1)
below (our "Opinion"), and no opinion is implied or to be inferred beyond such
matter.  Additionally, our Opinion is based on and subject to the
qualifications, limitations and exceptions set forth in this letter.

     In rendering our Opinion, we have examined such agreements, documents,
instruments and records as we deemed necessary or appropriate under the
circumstances for us to express our Opinion hereinafter set forth, including:
(i) the Registration Statement; (ii) the form of Indenture to be entered into by
and among AGL Resources, AGL Capital and The Bank of New York, as Trustee (the
"Indenture") and filed as an Exhibit to the Registration Statement; (iii) the
form of Amended and Restated Trust Agreement of the Trust (the "Declaration") to
be entered into among the administrative trustees named therein, The Bank of New
York, as property trustee, The Bank of New York (Delaware), as Delaware trustee,
and AGL Capital, as sponsor and filed as an Exhibit to the Registration
Statement; (iv) the form of the Debentures; (v) the form of Guarantee; and (vi)
minutes of proceedings of the Board of Directors of AGL Resources and AGL
Capital. In making all of our examinations, we assumed the legal capacity of all
natural


AGL Resources Inc.
May 3, 2001
Page 2

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persons, the genuineness of all signatures, the authenticity of all documents
submitted to us as originals, the conformity to the original documents of all
documents submitted to us as copies and the authenticity of the originals of
such latter documents, and the due execution and delivery of all documents by
any persons or entities where due execution and delivery by such persons or
entities is a prerequisite to the effectiveness of such documents.

     As to all questions of fact that are material to our Opinion, we have
relied upon the factual statements set forth in a certificate of an officer of
AGL Resources and certificates of various public officials.  We have not
independently verified or investigated, nor do we assume any responsibility for,
the factual accuracy or completeness of such factual statements.

     The members of this firm are admitted to the bar of the State of Georgia
and are duly qualified to practice law in that state.  Our Opinion is limited to
the laws of the State of Georgia and applicable federal laws that are in effect
on the date of this letter and that, in our professional judgment, are normally
applicable to transactions of the type contemplated herein.  We express no
opinion with regard to any matter which may be governed by the laws of any other
jurisdiction.  We express no opinion as to whether any court of any jurisdiction
will give effect to the governing law provision set forth in the Guarantee, but
have assumed, with your permission, hypothetically for purposes of our Opinion,
that if AGL Resources is brought before a proper court in the State of Georgia
to enforce rights under the Guarantee, such court will apply the substantive
laws of the State of Georgia, notwithstanding the governing law provision
contained in the Guarantee.  The opinion hereinafter set forth is based upon
pertinent laws and facts in existence as of the date hereof and we expressly
disclaim any obligation to advise you of any changes to such pertinent laws or
facts that may hereafter come to our attention.

     Based upon and subject to the foregoing, we are of the Opinion that:

          (1) The Guarantee has been duly authorized by AGL Resources, and when
     (i) the Declaration and Indenture have been qualified under the Trust
     Indenture Act of 1939, as amended, and (ii) the Guarantee is duly executed
     and delivered by AGL Resources and The Bank of New York, as trustee, and
     issued as contemplated by the Registration Statement, the Guarantee will
     constitute a valid, and binding obligation of AGL Resources, except as
     enforceability of AGL Resources' obligations may be limited by (a)
     bankruptcy, reorganization, insolvency, moratorium, fraudulent conveyance
     or transfer, or other laws or judicial decisions now or hereafter in effect
     relating to or affecting rights and remedies of creditors, (b) general
     principles of equity (regardless of whether considered in a proceeding at
     law or in equity) and matters of public policy, and (c) an implied covenant
     of good faith and fair dealing and potential unenforceability of certain
     provisions.


AGL Resources Inc.
May 3, 2001
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     We hereby consent to the filing of this letter as an exhibit to the
Registration Statement and to the reference to our firm under the heading "Legal
Matters" set forth in the Prospectus forming a part of the Registration
Statement.

                                    Very truly yours,

                                    /s/ Long Aldridge & Norman
                                    --------------------------
                                    Long Aldridge & Norman LLP