EXHIBIT 8.1



                           [Letterhead of Davis Polk & Wardwell]


                                                     March 26, 1998


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

AES Trust II
c/o The AES Corporation
1001 North 19th Street
Arlington, Virginia 22209

Dear Ladies and Gentlemen:

     We have acted as counsel for The AES  Corporation  (the  "Company") and AES
Trust II (the "Trust") in connection with the Registration Statement on Form S-3
(the  "Registration  Statement")  filed by the  Company  and the Trust  with the
Securities and Exchange  Commission under the Securities Act of 1933, as amended
(the "Securities  Act"),  relating to the registration of the Trust's $2.75 Term
Convertible  Securities,  Series B,  liquidation  amount $50 per  security  (the
"TECONS") to be sold by certain  holders of such TECONS.  The TECONS were issued
pursuant to the  provisions  of the Amended and  Restated  Declaration  of Trust
dated as of October 29, 1997 (the "Declaration")  among the Company, as sponsor,
First Chicago  Delaware  Inc.,  The First  National Bank of Chicago,  William R.
Luraschi,  Barry J. Sharp and Willard Hoagland, as trustees,  and are guaranteed
by the Company to the extent  described in the  Preferred  Securities  Guarantee
Agreement dated as of October 29, 1997 (the "Guarantee"). The Trust has acquired
$309,278,400 aggregate principal amount of 5.50% Junior Subordinated Convertible
Debentures (the  "Debentures") with the proceeds from the sale of the TECONS and
the sale to the Company of the common  securities of the Trust.  The  Debentures
were issued pursuant to the provisions of the Subordinated Indenture dated as of
March 1, 1997  between the Company and The First  National  Bank of Chicago,  as
trustee, as supplemented by a Second Supplemental  Indenture dated as of October
29, 1997 (the Indenture as so  supplemented  is  hereinafter  referred to as the
"Indenture").  (The preceding  documents to be  collectively  referred to as the
"Offering Document")




The AES Corporation                                        March 26, 1998


     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 or advisable for the
purpose of rendering this opinion. In rendering our opinion, we have assumed the
accuracy of the Offering  Documents  and that the issuance of the TECONS will be
consummated in accordance with the terms therein.

     Our  opinion is based on the  Internal  Revenue  Code of 1986,  as amended,
administrative  pronouncements,  judicial  decisions,  and existing and proposed
Treasury  Regulations,  all as currently in effect,  any of which may be changed
subsequent  to the date of this letter,  thereby  potentially  affecting the tax
consequences  opined on herein.  Based on the  Foregoing,  and assuming that the
Trustees  will  conduct  the  affairs  of  the  Trust  in  accordance  with  the
Declaration, we hereby confirm our opinion that the Trust will be classified for
United  States  federal  income tax  purposes  as a grantor  trust and not as an
association taxable as a corporation.

     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   constituting  a  part  of  the
Registration Statement.

     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