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.
                          6.90% DEBENTURES, SERIES 1998 D

      INTEREST RATE              MATURITY DATE              CUSIP
      6.90% per annum            October 1, 2028            209111 DA 8


REGISTERED HOLDER: Cede & Co.

PRINCIPAL SUM: SEVENTY FIVE MILLION DOLLARS ($75,000,000)

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  from
September  29,  1998,  or from the most recent  interest  payment  date to which
interest  has been duly paid or provided  for,  on April 1, 1999 and  thereafter
semi-annually on April 1 and October 1 in each year, at the interest rate stated
above,  until the date on which  payment of such  principal sum has been made or
duly provided for. The interest so payable on any interest  payment date will be
paid to the person in whose name this  Debenture is  registered  at the close of
business on the fifteenth day of the calendar  month next preceding the interest
payment date, except as otherwise provided in the Indenture.

      The  principal of and  premium,  if any, on 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.





                                       - 2 -

      This Debenture is one of a duly authorized series of an issue of unsecured
debt securities of the Company designated as its 6.90% Debentures, Series 1998 D
(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 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,  as a whole at any time, or in part
from time to time,  on or after  October 1, 2008,  at the  following  redemption
prices  (expressed as a percentage of the principal  amount of the Debentures to
be redeemed) together with unpaid interest accrued thereon to the date fixed for
redemption, if redeemed during the twelve-month period beginning on October 1,

                      Redemption                                Redemption
Year                    Price              Year                   Price
2008                  103.311%             2014                 101.324%
2009                  102.980%             2015                 100.993%
2010                  102.649%             2016                 100.662%
2011                  102.318%             2017                 100.331%
2012                  101.987%             2018 and thereafter  100.000%
2013                  101.656%

     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.







                                        -3-

      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 the premium thereon, 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.

      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 premium, if any, 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 and 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.






                                        -4-


      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.

      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

                                    Executive 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