Exhibit 5.2

                      [MARSHALL HILL CASSAS & de LIPKAU]

                              September 17, 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 III

Ladies and Gentlemen:

     We have acted as counsel to AGL Capital Corporation, a Nevada corporation
("AGL Capital"), 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, Inc. a Georgia
corporation ("AGL Resources"), AGL Capital and AGL Capital Trust III, formed
pursuant to a trust agreement executed by AGL Capital, as Sponsor, The Bank of
New York (Delaware), as Delaware Trustee, and the Administrative Trustees named
therein (the "Trust Agreement") and the filing of a Certificate of Trust with
the Delaware Secretary of State on August 21, 2001 (the "Trust").  The Trust
Agreement will be amended and restated and then qualified as an indenture under
the Trust Indenture Act of 1939.  Pursuant to the Registration Statement, AGL
Resources, AGL Capital and the Trust intend to register under the Securities Act
of 1933, as amended, any combination of (i) debt securities (the "Debt
Securities") to be issued by AGL Resources and/or AGL Capital; (ii) the Trust
Preferred Securities (as described in the Registration Statement) to be issued
by the Trust; and (iii) the Junior Subordinated Debentures (as described in the
Registration Statement) to be issued by AGL Capital.

     The proceeds of the Trust Preferred Securities will be invested in the
purchase by the Trust of the Junior Subordinated Debentures.  It is contemplated
that AGL Capital will have the right at any time to terminate the Trust and
cause the Junior Subordinated Debentures to be distributed to the holders of the
Trust Preferred Securities in liquidation of the Trust.  In addition, the Trust
automatically terminates on the first to occur of certain events, including
bankruptcy or dissolution, expiration of the term of the Trust, the entry of an
order for the dissolution of the Trust by a court and other events described in
the Registration Statement.

     The Registration Statement utilizes the shelf registration process.  The
Registration Statement and the prospectus which forms a part of it provides a
general description of the Trust Preferred Securities, the Debt Securities, the
Junior Subordinated Debentures and guarantees of the Debt Securities and the
Junior Subordinated Debentures.  Each time AGL Capital, AGL Resources and the
Trust sells any of the Trust Preferred Securities or Debt Securities, a
prospectus supplement will be provided and filed that will contain specific
information about the terms of that offering.


     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 matters set forth in the second and third from
the last paragraphs of this letter (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 copies of only the following
documents:

     (i)   the Registration Statement;

     (ii)  the Articles of Incorporation of AGL Capital as filed with the Nevada
           Secretary of State's Office on September 15, 2001;

     (iii) the Bylaws of AGL Capital as adopted by the Board of Directors of
           AGL Capital on September 25, 2000;

     (iv)  Unanimous Written Consent of the Board of Directors of AGL Capital
           dated as of August 23, 2001, authorizing and approving the
           Registration Statement, the formation of the Trust, and the issuance
           and sale of the Debt Securities and the Junior Subordinated
           Debentures by AGL Capital and matters related thereto;

     (v)   the Officer's Certificate of Paul R. Shlanta of AGL Capital dated
           September 17, 2001; and

     (vi)  the Certificate of Corporate Existence with respect to AGL Capital
           issued on August 22, 2001 by the Nevada Secretary of State.

     In making all of our examinations, we have assumed the legal capacity of
all natural persons, the genuineness of all signatures, the authenticity and
completeness 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 documents.  We also have assumed 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 the Registration Statement, in
the certificate of an officer of AGL Capital, item (iv) above, and in the
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 Nevada and
are duly qualified to practice law in that state.  We do not herein express any
opinion concerning any matter respecting or affected by any laws other than the
laws of the State of Nevada that are now


in effect and that, in the exercise of reasonable professional judgment, are
normally considered in transactions such as those contemplated by the issuance
and sale of the Debt Securities issued by AGL Capital (the "AGL Capital Debt
Securities") and the Junior Subordinated Debentures. 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, and assuming (a) that the Board of
Directors of AGL Resources, or a committee thereof, and the Board of Directors
of AGL Capital or duly constituted Pricing Committee thereof, duly authorizes by
proper corporate action the terms and issuance of the AGL Capital Debt
Securities and the guarantees thereof to be executed by AGL Resources, (b) the
indenture dated as of February 20, 2001, as supplemented and modified as
necessary (the "Debt Securities Indenture"), pursuant to which the AGL Capital
Debt Securities are issued has been duly qualified under the Trust Indenture Act
of 1939, as amended, and (c) the due execution, authentication, issuance and
delivery of the AGL Capital Debt Securities by AGL Capital upon payment of the
consideration therefor as provided in the Debt Securities Indenture and as
described in the Registration Statement and prospectus contained therein as
properly supplemented by a duly filed prospectus supplement, we are of the
opinion that the AGL Capital Debt Securities will constitute valid and binding
obligations of AGL Capital.

     Based upon and subject to the foregoing, and assuming (a) that the Board of
Directors of AGL Resources, or a committee thereof, and the Board of Directors
of AGL Capital or duly constituted Pricing Committee thereof duly authorizes by
proper corporate action the terms and issuance of the Junior Subordinated
Debentures and the guarantees thereof to be executed by AGL Resources, (b) the
indenture pursuant to which the Junior Subordinated Debentures are to be issued
(the "JSD Indenture") is properly drafted, executed, delivered and qualified
under the Trust Indenture Act of 1939, as amended, and (c) the due execution,
authentication, issuance and delivery of the Junior Subordinated Debentures by
AGL Capital upon payment of the consideration therefor as provided in the JSD
Indenture and as described in the Registration Statement and prospectus
contained therein as properly supplemented by a duly filed prospectus
supplement, we are of the opinion that the Junior Subordinated Debentures  will
constitute valid and binding obligations of AGL Capital.

     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.

                              MARSHALL HILL CASSAS & de LIPKAU


                              By /s/ John P. Fowler, Esq.
                                 ---------------------------------
                                    John P. Fowler, Esq.

JPF/lbe