EXHIBIT 5.1


                      [Davis Polk & Wardwell Letterhead]




                                       November 27, 1996

The AES Corporation
1001 North 19th Street
Arlington, Virginia  22209

Ladies and Gentlemen:

               We have acted as counsel in connection with the Company's
Registration Statement on Form S-3 (the "Registration Statement") filed with
the Securities and Exchange Commission pursuant to the Securities Act of 1933,
as amended, for the registration of the sale by the AES Corporation (the
"Company") from time to time of up to $750,000,000 aggregate principal amount
of senior debt securities, senior subordinated debt securities and junior
subordinated debt securities (collectively, the "Debt Securities"),
preferred stock, no par value, (the "Preferred Stock") of the Company,
common stock, par value $0.01 per share, (the "Common Stock") of the Company
and preferred securities (the "Preferred Securities") of AES Trust I, AES
Trust II and AES Trust III, each a statutory business trust created under the
Business Trust Act of the State of Delaware (each, a "Trust" and,
collectively, the "Trusts") and guarantees of the Preferred Securities by the
Company (the "Guarantees") and stock purchase contracts to purchase Common
Stock (the "Stock Purchase Contracts") and stock purchase units, each
representing ownership of a Stock Purchase Contract and Debt Securities or
debt obligations of third parties (the "Stock Purchase Units").  The senior
Debt Securities are to be issued pursuant to an Indenture (the "Senior Debt
Indenture") between the Company and The First National Bank of Chicago, as
trustee.  The senior subordinated Debt Securities are to be issued pursuant to
an Indenture dated as of July 1, 1996 (the "Senior Subordinated Debt
Indenture") between the Company and The First National Bank of Chicago, as
trustee.  The junior subordinated Debt Securities are to be issued pursuant to
an Indenture (the "Junior Subordinated Debt Indenture") between the Company
and The First National Bank of Chicago, as trustee.  The First National Bank
of Chicago in its capacity as trustee under the Senior Indenture, the
Subordinated Indenture and the Junior Subordinated Indenture is referred to
herein as the "Trustee" and the Senior Indenture, Subordinated Indenture and
Junior Subordinated Indenture are referred to herein collectively as the
"Indentures".

               We have examined originals or copies, certified or otherwise
identified to our satisfaction, of such documents, corporate records,
certificates of public officials and other instruments as we have deemed
necessary for the purposes of rendering this opinion.

               On the basis of the foregoing, we are of the opinion that:

               1.    When the Indentures and any supplemental indenture to be
         entered into in connection with the issuance of any Debt Security
         have been duly authorized, executed and delivered by the Trustee and
         the Company, the specific terms of a particular Debt Security have
         been duly authorized and established in accordance with the
         applicable Indenture and such Debt Security has been duly authorized,
         executed, authenticated, issued and delivered in accordance with the
         applicable Indenture and the applicable underwriting or other
         agreement, such Debt Security will constitute a valid and binding
         obligation of the Company, enforceable in accordance with its terms,
         except as (a) the enforceability thereof may be limited by
         bankruptcy, insolvency, reorganization, fraudulent transfer,
         moratorium or similar laws now or hereinafter in effect relating to
         or affecting the enforcement of creditors' rights generally and (b)
         the availability of equitable remedies may be limited by equitable
         principles of general applicability (regardless of whether considered
         in a proceeding at law or in equity).

               2.    Upon designation of the relative rights, preferences and
         limitations of any series of Preferred Stock by the Board of
         Directors of the Company and the proper filing with the Secretary of
         State of the State of Delaware of a Certificate of Designation
         relating to such series of Preferred Stock, all necessary corporate
         action on the part of the Company will have been taken to authorize
         the issuance and sale of such series of Preferred Stock proposed to
         be sold by the Company, and when such shares of Preferred Stock are
         issued and delivered in accordance with the applicable underwriting
         or other agreement, such shares of Preferred Stock will be validly
         issued, fully paid and non-assessable, enforceable in accordance with
         their terms, except as (a) the enforceability thereof may be limited
         by bankruptcy, insolvency, reorganization, fraudulent transfer,
         moratorium or similar laws now or hereinafter in effect relating to
         or affecting the enforcement of creditors' rights generally and (b)
         the availability of equitable remedies may be limited by equitable
         principles of general applicability (regardless of whether considered
         in a proceeding at law or in equity).

               3.  When all necessary corporate action on the part of the
         Company has been taken to authorize the issuance and sale of such
         shares of Common Stock proposed to be sold by the Company, and
         when such shares of Common Stock are issued and delivered in
         accordance with the applicable underwriting or other agreement,
         such shares of Common Stock will be validly issued, fully paid and
         non-assessable.


               4.    When the Guarantees have been duly authorized by the
         Company, the applicable Guarantee Agreement has been duly executed
         and delivered and the Preferred Securities have been duly issued and
         delivered by the applicable Trust as contemplated by the Registration
         Statement and any prospectus supplement relating thereto, the
         Guarantees will constitute valid and binding obligations of the
         Company, enforceable in accordance with their terms, except as (a) the
         enforceability thereof may be limited by bankruptcy, insolvency,
         reorganization, fraudulent transfer, moratorium or similar laws now
         or hereinafter in effect relating to or affecting the enforcement of
         creditors' rights generally and (b) the availability of equitable
         remedies may be limited by equitable principles of general
         applicability (regardless of whether considered in a proceeding at
         law or in equity).

               5.  When the Stock Purchase Units and Stock Purchase
         Contracts have been duly authorized by the Company, the applicable
         Purchase Contract Agreement and Pledge Agreement have been duly
         executed and delivered, the Stock Purchase Units and Stock Purchase
         Contracts will constitute valid and binding obligations of the
         Company, enforceable in accordance with their terms, except as (a)
         the enforceability thereof may be limited by bankruptcy,
         insolvency, reorganization, fraudulent transfer, moratorium or
         similar laws now or hereinafter in effect relating to or affecting
         the enforcement of creditors' rights generally and (b) the
         availability of equitable remedies may be limited by equitable
         principles of general applicability (regardless of whether
         considered in a proceeding at law or in equity).


               In connection with the opinions expressed above, we have
assumed that, at or prior to the time of the delivery of any such security,
(i) the Board of Directors shall have duly established the terms of such
security and duly authorized the issuance and sale of such security and such
authorization shall not have been modified or rescinded; (ii) the Registration
Statement shall have been declared effective and such effectiveness shall not
have been terminated or rescinded; and (iii) there shall not have occurred any
change in law affecting the validity or enforceability of such security.  We
have also assumed that none of the terms of any security to be established
subsequent to the date hereof, nor the issuance and delivery of such security,
nor the compliance by the Company with the terms of such security will violate
any applicable law or will result in a violation of any provision of any
instrument or agreement then binding upon the Company, or any restriction
imposed by any court or governmental body having jurisdiction over the Company.

               We are members of the Bar of the State of New York and the
foregoing opinion is limited to the laws of the State of New York, the federal
laws of the United States of America and the General Corporation Law of the
State of Delaware.

               We hereby consent to the filing of this opinion as an exhibit
to the Registration Statement.  In addition, we consent to the reference to us
under the caption "Legal Matters" in the prospectus.

               This opinion is rendered solely to you in connection with the
above matter.  This opinion may not be relied upon by you for any other
purpose or relied upon by or furnished to any other person without our prior
written consent.


                                       Very truly yours,

                                       /s/ Davis Polk & Wardwell
                                       ---------------------------
                                           Davis Polk & Wardwell