[Unless this  certificate  is presented by an authorized  representative  of The
Depository Trust Company, a New York corporation  ("DTC"), to the Company or its
agent for registration of transfer,  exchange,  or payment,  and any certificate
issued  is  registered  in the name of Cede & Co.  or in such  other  name as is
requested  by an  authorized  representative  of DTC (and any payment is made to
Cede  &  Co.  or  to  such  other  entity  as  is  requested  by  an  authorized
representative  of DTC), ANY TRANSFER,  PLEDGE, OR OTHER USE HEREOF FOR VALUE OR
OTHERWISE  BY OR TO ANY PERSON IS  WRONGFUL  inasmuch  as the  registered  owner
hereof, Cede & Co., has an interest herein.]

      REGISTERED                          REGISTERED

                   Consolidated Edison Company of New York, Inc.
                     FLOATING RATE DEBENTURES, SERIES 1997 A

      INTEREST RATE           MATURITY DATE           CUSIP
      Floating Rate              June 15, 2002        209111 CU 5
      (Determined as
      described herein)


REGISTERED HOLDER: Cede & Co.


PRINCIPAL SUM: ONE HUNDRED FIFTY MILLION DOLLARS ($150,000,000)


CONSOLIDATED   EDISON  COMPANY  OF  NEW  YORK,  INC.,  a  New  York  corporation
(hereinafter called the "Company", which term includes any successor corporation
under  the  Indenture  hereinafter  referred  to),  for value  received,  hereby
promises to pay to the registered holder named above or registered  assigns,  on
the maturity date stated above,  unless  redeemed  prior thereto as  hereinafter
provided,  the principal sum stated above and to pay interest thereon, until the
date on which payment of such  principal sum has been made or duly provided for,
on March 15, June 15,  September 15 and  December 15 (each an "Interest  Payment
Date"),  commencing  September  15,  1997,  for  the  period  commencing  on and
including  the  immediately  preceding  Interest  Payment Date and ending on and
including  the day next  preceding  the  Interest  Payment  Date  (an  "Interest
Period"),  with the exception that the first  Interest  Period shall commence on
and include June 20, 1997 and end on and include  September  14, 1997.  Interest
will be paid to the registered holder of this Debenture at the close of business
on the last day of the month  preceding  the Interest  Payment  Date,  except as
otherwise provided in the Indenture.






                                          - 2 -



      This Debenture bears interest at a rate per annum, reset quarterly,  equal
to LIBOR (as defined below) plus 0.06000%,  as determined by The Chase Manhattan
Bank,  which has agreed to act as  calculation  agent for the  Debentures,  or a
successor  calculation agent appointed by the Company (the "Calculation Agent").
In no event, however, shall such rate exceed the maximum interest rate permitted
by applicable law. Upon the request of any person,  the  Calculation  Agent will
advise the person of the interest rate then in effect for the Debentures.

      "LIBOR",  with respect to an Interest Period, shall be the rate (expressed
as a  percentage  per  annum)  for  deposits  in  United  States  dollars  for a
three-month period beginning on the second London Banking Day (as defined below)
after the  Determination  Date (as defined  below) that appears on Telerate Page
3750 (as defined  below) as of 11:00 a.m.,  London  time,  on the  Determination
Date. If Telerate Page 3750 does not include such a rate or is  unavailable on a
Determination  Date,  LIBOR for the Interest Period shall be the arithmetic mean
of  the  rates  (expressed  as  a  percentage  per  annum)  for  deposits  in  a
Representative  Amount  (as  defined  below)  in  United  States  dollars  for a
three-month  period  beginning  on the  second  London  Banking  Day  after  the
Determination  Date that appears on Reuters  Screen LIBO Page (as defined below)
as of 11:00 a.m., London time, on the Determination Date. If Reuters Screen LIBO
Page does not include  two or more rates or is  unavailable  on a  Determination
Date, the Calculation  Agent will request the principal London office of each of
four  major  banks in the  London  interbank  market,  one of  which  may be the
Calculation  Agent or its affiliate,  selected by the  Calculation  Agent (after
consulting with the Company) to provide such bank's offered quotation (expressed
as a percentage per annum), as of approximately 11:00 a.m., London time, on such
Determination  Date, to prime banks in the London  interbank market for deposits
in a  Representative  Amount in United States  dollars for a three-month  period
beginning on the second London Banking Day after the  Determination  Date. If at
least two such offered quotations are so provided, LIBOR for the Interest Period
will  be the  arithmetic  mean  of such  quotations.  If  fewer  than  two  such
quotations  are so provided,  the  Calculation  Agent will request each of three
major banks in New York City, one of which may be the  Calculation  Agent or its
affiliate, selected by the Calculation Agent (after consulting with the Company)
to provide  such bank's  rate  (expressed  as a  percentage  per  annum),  as of
approximately  11:00 a.m., New York City time, on such  Determination  Date, for
loans in a  Representative  Amount in United States dollars to leading  European
banks for a three-month  period beginning on the second London Banking Day after
the  Determination  Date. If at least two such rates are so provided,  LIBOR for
the Interest Period will be the arithmetic mean of such rates. If fewer than two
such rates are so provided, then LIBOR for the Interest Period






                                           -3-



will be LIBOR in effect with respect to the immediately preceding Interest
Period.

      "Determination Date" with respect to an Interest Period will be the second
London Banking Day preceding the first day of the Interest Period.

      "London Banking Day" is any day in which dealings in United States dollars
are  transacted  or,  with  respect  to any  future  date,  are  expected  to be
transacted in the London interbank market.

      "Representative Amount" means a principal amount of not less than U.S.
$1,000,000 for a single transaction in the relevant market at the relevant time.

      "Telerate  Page 3750" means the display  designated  as "Page 3750" on the
Dow Jones Telerate  Service (or such other page as may replace Page 3750 on that
service).

      "Reuters Screen LIBO Page" means the display  designated as page "LIBO" on
The Reuters  Monitor  Money Rates Service (or such other page as may replace the
LIBO page on that service).

      Interest on the  Debentures  will be calculated on the basis of the actual
number of days for which  interest is payable in the Interest  Period divided by
360. All  percentages  resulting  from any  calculation in respect of Debentures
will be rounded to the nearest ten-thousandth of a percentage point.

      The  principal  of this  Debenture,  when  due and  payable,  shall,  upon
presentation  and  surrender  hereof,  be paid at the  principal  office  of the
Company. The interest on this Debenture,  when due and payable, shall be paid at
the principal office of the Company,  or at the option of the Company,  by check
mailed to the address of the registered  holder hereof or registered  assigns as
such address shall appear in the Security  Register.  All such payments shall be
made in such coin or currency of the United  States of America as at the time of
payment is legal tender for payment of public and private debts.

      This Debenture is one of a duly authorized series of an issue of unsecured
debt  securities  of the Company  designated  as its Floating  Rate  Debentures,
Series 1997 A  (hereinafter  called the  "Debentures"),  issued and to be issued
under an  Indenture  dated as of  December  1, 1990  between the Company and The
Chase  Manhattan Bank,  Trustee  (hereinafter  called the "Trustee",  which term
includes any successor trustee under the Indenture), as amended and supplemented
by the First Supplemental Indenture, dated






                                        -4-



as of March 6, 1996, between the Company and the Trustee (hereinafter called the
"Indenture").  Reference is made to the Indenture and any supplemental indenture
thereto for the  provisions  relating,  among other  things,  to the  respective
rights of the Company,  the Trustee and the holders of the  Debentures,  and the
terms on which the Debentures are, and are to be, authenticated and delivered.

      The  Company  may  redeem  the  Debentures,  in whole  or in part,  on any
Interest  Payment Date on or after June 15, 1999, at a price equal to 100.00% of
the principal amount of the Debentures to be redeemed, together with the accrued
interest to be paid on such  Debentures on such  Interest  Payment Date. If this
Debenture or any portion hereof is called for  redemption,  interest shall cease
to  accrue  on this  Debenture  or such  portion  hereof  on the date  fixed for
redemption.

      If an Event of Default (as defined in the  Indenture)  shall have occurred
and be continuing,  with respect to the Debentures,  the principal hereof may be
declared,  and upon such  declaration  shall  become,  due and  payable,  in the
manner,  with  such  effect  and  subject  to  the  conditions  provided  in the
Indenture.  Any such  declaration  may be  rescinded by holders of a majority in
principal  amount of the  outstanding  Debentures  if all Events of Default with
respect to the  Debentures  (other  than the non-  payment of  principal  of the
Debentures  which  shall have  become due by such  declaration)  shall have been
remedied.

The Indenture contains provisions  permitting the Company and the Trustee,  with
the consent of the holders of not less than a majority  in  aggregate  principal
amount of the Debentures at the time outstanding,  evidenced as in the Indenture
provided,  to  execute  supplemental  indentures  adding any  provisions  to the
Indenture or to any  supplemental  indenture with respect to the Debentures,  or
modifying in any manner the rights of the holders of the  Debentures;  provided,
however,  that no such  supplemental  indenture shall (i) extend the maturity of
any Debenture,  or reduce the principal amount thereof,  or the premium thereon,
if any, or reduce the rate or extend the time of payment of interest  thereon or
make the principal  thereof or premium,  if any, or interest  thereon payable in
any coin or currency  other than that in the  Debentures  provided,  without the
consent  of the  holder  of each  Debenture  so  affected,  or (ii)  reduce  the
aforesaid  principal amount of Debentures,  the holders of which are required to
consent to any such supplemental indenture without the consent of the holders of
all Debentures then outstanding.






                                        -5-



      The  Debentures  are  issuable  as  registered  Debentures  only,  in  the
denomination  of $1,000 and any  integral  multiples  of $1,000  approved by the
Company, such approval to be evidenced by the execution thereof.

      This Debenture is transferable  by the registered  holder hereof in person
or by his attorney duly authorized in writing on the books of the Company at the
office or agency to be maintained  by the Company for that purpose,  but only in
the  manner,  subject  to  the  limitations  and  upon  payment  of  any  tax or
governmental charge for which the Company may require  reimbursement as provided
in the Indenture,  and upon surrender and  cancellation of this Debenture.  Upon
any  registration  of transfer,  a new registered  Debenture or  Debentures,  of
authorized  denomination or denominations,  and in the same aggregate  principal
amount, will be issued to the transferee in exchange therefor.

      The Company,  the Trustee, any paying agent and any Security registrar may
deem and treat  the  registered  holder  hereof  as the  absolute  owner of this
Debenture  (whether or not this Debenture  shall be overdue and  notwithstanding
any notations of ownership or other writing hereon made by anyone other than the
Security registrar) for the purpose of receiving payment of or on account of the
principal  hereof and interest  due hereon as herein  provided and for all other
purposes,  and neither the Company nor the Trustee nor any paying  agent nor any
Security registrar shall be affected by any notice to the contrary.

      No recourse  shall be had for the payment of the  principal of or premium,
if any,  or  interest  on this  Debenture,  or for any claim  based  hereon,  or
otherwise in respect  hereof,  or based on or in respect of the Indenture or any
indenture  supplemental  thereto,  against any incorporator or against any past,
present or future  stockholder,  officer or member of the Board of Trustees,  as
such, of the Company, whether by virtue of any constitution,  statute or rule of
law, or by the  enforcement of any assessment or penalty or otherwise,  all such
liability being, by the acceptance  hereof and as part of the  consideration for
the issue hereof, expressly waived and released.

      This Debenture shall be deemed to be a contract made under the laws of the
State of New York,  and for all purposes  shall be construed in accordance  with
the laws of the State of New York.

      This Debenture shall not be entitled to any benefit under the Indenture or
be valid or obligatory for any purpose until the  certificate of  authentication
on the face hereof is manually signed by the Trustee.






                                        -6-

      IN WITNESS WHEREOF,  the Company has caused this Debenture to be signed by
the manual or facsimile  signatures of a Vice President and the Treasurer of the
Company,  and a  facsimile  of its  corporate  seal to be affixed or  reproduced
hereon.


            CONSOLIDATED EDISON COMPANY OF NEW YORK, INC.

By

                                    Vice President and Treasurer

By

                                    Senior Vice President
                                      and Chief Financial Officer


SEAL


TRUSTEE'S CERTIFICATE OF AUTHENTICATION
This is one of the Securities of the series  designated  herein issued under the
Indenture described herein.

                                   THE CHASE MANHATTAN BANK,
                                   as Trustee



By

                                   Authorized Officer