UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                   FORM 12b-25

                    UNDER THE SECURITIES EXCHANGE ACT OF 1934

                           NOTIFICATION OF LATE FILING


                             SEC File Number: 1-3571
                            CUSIP NUMBER : 542671102


(Check One):

/  / Form 10-K / / Form  11-K / / Form 20-F /x/ Form 10-Q / / Form  N-SAR 
     For Period Ended: June 30, 1998

/  / Transition Report on Form 10-K        /  / Transition Report on Form 10-Q
/  / Transition Report on Form 20-F        /  / Transition Report on Form N-SAR
/  / Transition Report on Form 11-K
       For the Transition Period Ended:

    Read Attached Instruction Sheet Before Preparing Form. Please Print or Type.

    Nothing in this form shall be  construed  to imply that the  Commission  has
verified any information contained herein.

     If the  notification  relates  to a portion of the  filing  checked  above,
identify the item(s) to which the notification relates:

                                     Part I
                             Registrant Information

    Full Name of Registrant:  Long Island Lighting Company

    Former Name if Applicable:  N/A

    Address of Principal Executive 
    Office (Street and Number): 333 Earle Ovington Blvd.

    City, State and Zip Code:  Uniondale, New York 11553

                                     Part II
                             Rule 12b-25 (b) and (c)

           If the subject report could not be filed without  unreasonable effort
or expense and the  registrant  seeks  relief  pursuant to Rule  12b-25(b),  the
following should be completed.
(Check box if appropriate)

   /x /        (a) The  reasons  described in  reasonable  detail in Part III of
               this form could not be eliminated without  unreasonable effort or
               expense;

   /x /        (b) The  subject annual report,  semi-annual  report,  transition
               report on Form 10-K,  Form 20-F,  11-K or Form N-SAR,  or portion
               thereof  will be filed on or before the  fifteenth  calendar  day
               following  the  prescribed  due date;  or the  subject  quarterly
               report or transition report on Form 10-Q, or portion thereof will
               be filed on or  before  the  fifth  calendar  day  following  the
               prescribed due date; and

    /  /       (c) The  accountant's  statement  or  other  exhibit  required by
               Rule 12b-25(c) has been attached if applicable.

                                    Part III
                                    Narrative

           State below in  reasonable  detail the reasons why Form 10-K and Form
10-KSB,  20-F,  11-K, 10-Q and Form 10-QSB,  N-SAR, or the transition  report or
portion thereof could not be filed within the prescribed period.

           On May 28,  1998,  all the common  stock of the Long Island  Lighting
Company (the  "Registrant")  was acquired by the Long Island Power Authority,  a
corporate municipal  instrumentality  and political  subdivision of the State of
New York (the "Authority")  through a merger transaction in which a wholly owned
subsidiary of the Authority  merged with and into the Registrant (the "Merger").
Immediately  prior to the Merger,  the Registrant  transferred all of its assets
employed in the conduct of its gas  distribution  business  and its  non-nuclear
electric  generating  business,  and all common assets used by the Registrant in
the  operation  and  management of its electric  transmission  and  distribution
business  and  its  gas  distribution  business  and  its  non-nuclear  electric
generation  business to  MarketSpan  Corporation  which then merged with KeySpan
Energy Corporation, the parent holding company of the Brooklyn Union Gas Company
(the "Disposition").

           As a result of the Merger and the  Disposition,  all employees of the
Registrant,  including  those with  responsibility  for financial  reporting and
accounting  matters,  left the  employ  of the  Registrant  and  began  work for
MarketSpan  Corporation.  Also,  following the Merger, the Registrant  dismissed
Ernst   &   Young   LLP   as   its    independent    auditors    and    retained
PricewaterhouseCoopers  LLP. Although,  the Registrant  believed that, under the
terms  of  a  management  services  agreement,  the  necessary  assistance  from
MarketSpan  Corporation's  employees  and  independent  auditors  would  be made
available  to  enable  the   Registrant  to  satisfy  its  financial   reporting
obligations on a timely basis,  such key personnel were not available within the
required  timeframe.  Such  personnel  were  apparently  required  to devote the
majority of their available time to the preparation of MarketSpan  Corporation's
financial reports.  The difficulties in obtaining  assistance were compounded by
the fact that as a result of the Merger and the Disposition  both the Registrant
and MarketSpan  Corporation were essentially  significantly  different  entities
than they were prior to the transactions,  further complicating their respective
reporting obligations.

           As a result of the  unavailability  of such necessary  assistance and
the  significant  change in the  character  and  operations  of the  Registrant,
including its transformation from a publicly-held corporation to one effectively
controlled by a political  subdivision  of the State of New York, the Registrant
has been unavoidably delayed in the preparation of certain financial and related
disclosures.  Consequently,  the  subject  report  could  not be  filed  without
unreasonable effort or expense.



                                     Part IV
                                Other Information

    (1) Name and  telephone  number  of  person  to  contact  in  regard to this
notification:

           David P. Warren                               (516)-222-7700
               (Name)                           (Area Code) (Telephone Number)

    (2) Have all other  periodic  reports  required under section 13 or 15(d) of
the Securities  Exchange Act of 1934 or section 30 of the Investment Company Act
of 1940  during the  preceding  12 months or for such  shorter  period  that the
registrant was required to file such report(s) been filed?  If the answer is no,
identify report(s). /x / Yes / / No

     (3) Is it anticipated that any significant  change in results of operations
from the corresponding  period for the last fiscal year will be reflected by the
earnings  statements to be included in the subject report or portion thereof?
 /x/ Yes / / No

    If so: attach an explanation of the anticipated change, both narratively and
quantitatively, and, if appropriate, state the reasons why a reasonable estimate
of the results cannot be made.

     The income  statement  information  reflecting the results of operations of
the  Registrant  for the  three-month  period ended June 30,  1998,  will differ
significantly  from the results for the three-month  period ended June 30, 1997,
for the following reasons:

           (i) A change in control of the Registrant took place on May 28, 1998,
as the  result of the Merger,  that resulted in the Authority gaining control of
the Registrant.

           (ii)   The   Authority   forwarded   the   Registrant   approximately
$4,949,000,000  in exchange for a promissory  note.  These proceeds were used by
the Registrant  primarily to: (i) acquire all of the then outstanding  shares of
common  stock of the  Registrant;  (ii)  redeem the then  outstanding  shares of
preferred stock of the Registrant; and (iii) defease certain debt obligations of
the Registrant. This fundamentally changed the capitalization of the Registrant,
and the related interest expense incurred.

           (iii) By reason of the Disposition,  the Registrant ceased operations
of its former gas business and fossil generation assets.

           (iv) The Registrant  reduced its electric rates for all its customers
approximately 20%.

           (v) The Registrant has  eliminated  the  amortization  related to its
regulatory assets and liabilities.

Due to the reasons described in Part III herein above, a reasonable  estimate of
the results cannot be made at this time.


                          Long Island Lighting Company
                  (Name of Registrant as specified in charter)

Has  caused  this  notification  to be signed on its  behalf by the  undersigned
thereunto duly authorized.



  Date: August 14, 1998            By: /s/ David P. Warren
                                       -------------------
                                       Name: David P. Warren
                                       Title: Chief Financial Officer