Exhibit 99.1

KEYSPAN                                                                    NEWS
- -------------------------------------------------------------------------------
KeySpan Corporation                                       For Immediate Release


Contacts:  Investors                                           Media Relations
           George Laskaris                                      718.403.2503
           718.403.2526

                  KeySpan Announces Strong 1st Quarter Results
                  --------------------------------------------

                    Excellent Gas Performance Drives Results
           KeySpan/National Grid Transaction Moving Forward as Planned

Brooklyn,  New York, April 27, 2007 - KeySpan  Corporation (NYSE: KSE) announced
consolidated earnings of $213.4 million or $1.22 per share for the first quarter
of 2007,  as compared  to $208.0  million or $1.19 per share for the same period
last year.  These first quarter  favorable  results were primarily driven by the
strong  performance  in the gas  businesses  of New York,  Long  Island  and New
England as well as the Energy Services and Investments segments.

"We  are  extremely   pleased  with  our  strong  first  quarter  results  which
demonstrates  the strength of our core gas heating business which benefited from
strong customer demand," said Robert B. Catell,  Chairman and CEO. "In addition,
gas customer  growth is ahead of plan,  again  demonstrating  the organic growth
potential  in our  service  territories.  We are on track to achieve our goal of
adding  approximately  $50  million in new gross  profit  margin  for 2007.  Our
electric business reported lower results primarily due to increased  competition
in New York City as well as lower  hedging  gains  compared  to last year.  As a
result of our maintenance and upgrading  programs,  our gas and electric systems
performed very reliably during the winter heating season as we broke gas sendout
records in both our New York and Long Island service  territories.  In addition,
we continued to maintain our strong  financial  position  with our debt to total
capitalization ratio remaining below 50%."

The  previously  announced  acquisition of KeySpan by National Grid continues to
move forward as the required federal and state regulatory  filings and approvals
are progressing.  All federal and shareholder approvals have been received.  The
New York and New  Hampshire  state  regulatory  approvals  are the remaining two
necessary  to close the  transaction.  In both these  jurisdictions,  procedural
schedules  have been set and the cases are well  underway.  In New Hampshire the
parties have reached a settlement in principle, for approval of the transaction.
In addition,  the companies have reached an agreement with the Long Island Power
Authority to continue to operate its transmission  and distribution  system once
the transaction is approved.

"I am very encouraged by the settlement  reached in New Hampshire as well as the
recent agreement  National Grid and KeySpan reached with LIPA," said Mr. Catell.
"The  economies of scale and  increased  purchasing  power of National  Grid and
KeySpan will  generate  savings for gas and electric  consumers in New Hampshire





and to LIPA's customers on Long Island as well as provide  environmental benefit
through upgrades to our power plants.  Our integration teams have also been busy
developing the strategies and  organizational  structures  that will support the
combined  Company.  The process of selecting the senior  management  team is now
virtually   complete.   This  transaction  will  deliver  significant  value  to
shareholders and provide  benefits to customers of both companies.  I am looking
forward to KeySpan becoming an important part of one of the largest and foremost
energy companies in the world."

Segment Highlights

Results from continuing operations in 2007 and 2006 are reported on an Operating
Income basis as follows:



- ------------------------------------------------------ --------------------------- ----------------------------
        Operating Income / (Loss) [$ millions]                    1st Quarter 2007            1st Quarter 2006
        --------------------------------------                    ----------------            ----------------
- ------------------------------------------------------ --------------------------- ----------------------------
                                                                                                  
Gas Distribution                                                            402.5                        336.4
- ------------------------------------------------------ --------------------------- ----------------------------
Electric Services                                                            (1.5)                        65.0
- ------------------------------------------------------ --------------------------- ----------------------------
Energy Investments                                                            5.1                          3.0
- ------------------------------------------------------ --------------------------- ----------------------------
Energy Services                                                               1.4                         (0.4)
- ------------------------------------------------------ --------------------------- ----------------------------
Total Operating Segments                                                    407.5                        404.0
- ------------------------------------------------------ --------------------------- ----------------------------
Other                                                                        (8.0)                       (14.9)
                                                                             -----                       ------
- ------------------------------------------------------ --------------------------- ----------------------------
Total Operating Income                                                      399.5                        389.1
- ------------------------------------------------------ --------------------------- ----------------------------


Key Operating Income Drivers by Segment

o    The Gas Distribution  segment,  which serves New York City, Long Island and
     New England, reported operating income of $402.5 million in the quarter, an
     increase  of $66.1  million or 20%,  compared to the same period last year.
     These results benefited  primarily from increased  customer demand from the
     colder  weather,  new  customer  additions  and higher  sales in our "large
     volume" heating market. For the quarter,  weather was 3% colder than normal
     in all our  territories,  and 15% and 11% colder  than last year in our New
     York and New England  territories,  respectively.  The company continued to
     significantly  add customers as KeySpan completed  approximately  8,800 gas
     installations  during the quarter,  adding  approximately $9 million in new
     gross profit margin.  Net revenues for the quarter increased $71.7 million,
     partially offset by increased operating expenses of $5.6 million, primarily
     due to higher property taxes.

o    The Electric  Services  segment owns and operates  6650 MW of generation in
     the New York City and Long  Island  "load  pockets"  and  manages  the Long
     Island  Power  Authority's   transmission  and  distribution  system  under
     long-term  contracts.  This  segment  reported  an  operating  loss of $1.5
     million for the first quarter,  compared to operating income of $65 million
     for the same period last year. This reduction in operating  income reflects
     lower net energy and capacity revenues of $53.8 million from the Ravenswood
     generating  plant,  primarily from lower hedging gains in the energy market
     and the addition of 1000 MW of new  generation in the New York City market.
     The  energy  margins  in  2006  benefited  from  large  oil  to  gas  price


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     differentials  and the dual fuel  nature  of the  Ravenswood  plant.  These
     results also reflect an increase in operating  expenses of approximately $8
     million caused by higher generator overhaul costs. In addition, the segment
     realized an expected loss of $9.9 million on the financial  capacity  swap.
     KeySpan  entered  into a three year  financial  capacity  swap with  Morgan
     Stanley in 2006, which settles on a monthly basis.

o    The Energy  Investments  segment reported operating income of $5.1 million,
     compared to $3 million for the same period in 2006.  This segment  includes
     the Company's  complementary  assets in natural gas pipelines,  storage and
     other energy  related  investments  as well as production  and  development
     investments.  These results reflect higher earnings from TransGas,  the LNG
     trucking operations, due to the colder first quarter weather.

o    The Energy  Services  segment  achieved  operating  income of $1.4  million
     compared to a loss of $0.4 million  last year.  This  enhanced  performance
     reflects higher profits in our services and communications businesses. This
     segment  includes  companies that provide energy related  services to homes
     and businesses in the New York City and Boston metropolitan areas.

Financial Update

The Company was able to reduce interest  expense by approximately $5 million for
the quarter  compared to the same period last year. This reflects the success of
KeySpan's  interest rate risk mitigation  policy,  where over 90% of our debt is
now fixed, limiting our exposure to rising interest rates.

At the end of the first  quarter,  the  Company's  debt to total  capitalization
ratio  improved  to 48.6%,  as  compared to 48.9% for the same period last year,
reinforcing its "A" quality credit rating and low business risk profile.

The Company  declared a  quarterly  common  stock  dividend of $0.475 per share,
payable  May 1,  2007,  to  shareholders  of record as of April 18,  2007.  This
dividend payment reflects an annual increase of $0.04 per share, and is the 36th
consecutive period of paying a dividend as KeySpan. The new annual dividend rate
of $1.90 per share is supported by the Company's  strong cash flows and provides
a yield to shareholders of approximately 4.5%.

- --------------------------------------------------------------------------------
Investors  are  invited to listen to the  KeySpan  Corporation  2007 1st Quarter
Earnings Conference Call on:

Friday, April 27, 2007, at 10:30 AM (EST)

Live Dial-In Number: (800) 236-8506
International Dial Number: (719)457-2681

Replay will begin two hours after completion of the call until May 1, 2007
Replay Number: (888)203-1112
International Replay Number: (719)457-0820
Conference Call ID: 2244192

Audio webcast available at http://investor.keyspanenergy.com


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A member of the Standard & Poor's 500 Index,  KeySpan Corporation  (NYSE:KSE) is
the largest distributor of natural gas in the Northeast United States, operating
regulated gas utilities in New York,  Massachusetts  and New Hampshire,  serving
2.6 million customers.  These customer-focused  businesses are complemented by a
portfolio of service companies which offer energy-related products, services and
solutions to homes and businesses.

KeySpan is also the largest  electric  generator in New York State.  The Company
owns approximately  6,650 megawatts of generating  capacity,  providing power to
1.1 million  customers  of the Long Island  Power  Authority  on Long Island and
supplying  approximately  25  percent  of New York  City's  capacity  needs.  In
addition  to  these  assets,  KeySpan  has  strategic  investments  in  pipeline
transportation,  distribution and storage. KeySpan has headquarters in Brooklyn,
New England and Long Island.  For more information,  visit KeySpan's web site at
www.keyspanenergy.com.

Certain  statements  contained  herein  are  forward-looking  statements,  which
reflect  numerous  assumptions  and  estimates and involve a number of risks and
uncertainties.  For these statements, we claim the protection of the safe harbor
for  forward-looking  statements  provided by the Private Securities  Litigation
Reform Act of 1995. There are possible  developments that could cause our actual
results  to  differ   materially  from  those   forecasted  or  implied  in  the
forward-looking  statements.  You are cautioned  not to place undue  reliance on
these forward-looking statements,  which are current only as of the date of this
filing.  We  disclaim  any  intention  or  obligation  to update  or revise  any
forward-looking  statements,  whether  as a result  of new  information,  future
events or otherwise. Among the factors that could cause actual results to differ
materially are: general economic conditions,  especially in the Northeast United
States;  available  sources and costs of fuel;  volatility of energy prices in a
deregulated  market environment as well as in the source of natural gas and fuel
used to generate electricity;  potential write-down of the carrying value of our
investment in certain  unregulated  subsidiaries and natural gas properties when
natural gas prices are depressed or if we have significant downward revisions in
our estimated proved gas reserves; federal and state regulatory initiatives that
increase  competition,  threaten  cost and  investment  recovery and impact rate
structure;   our   ability  to   successfully   reduce   our  cost   structures;
implementation  of new  accounting  standards;  the  degree to which we  develop
unregulated business ventures,  as well as federal and state regulatory policies
affecting our ability to retain and operate those business ventures; our ability
to  identify  and make  complementary  acquisitions,  as well as the  successful
integration of those  acquisitions;  inflationary trends and interest rates; and
risks detailed from time to time in reports and other documents filed by us with
the Securities and Exchange Commission.


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                               KeySpan Corporation
                        Consolidated Statement of Income
- ---------------------------------------------------------------------------------------------------------
                                                                       Three Months Ended
                                                                             March 31,
(In Millions of Dollars, Except Per Share Amounts)                     2007                    2006
- ---------------------------------------------------------------------------------------------------------
                                                                                          
Revenues
     Gas Distribution                                                  $ 2,415.5                $ 2,180.1
     Electric Services                                                     384.4                    424.8
     Energy Services                                                        52.6                     48.4
     Energy Investments                                                     10.0                      7.8
                                                         ------------------------------------------------
Total Revenues                                                           2,862.5                  2,661.1
                                                         ------------------------------------------------
Operating Expenses
     Purchased gas for resale                                            1,672.7                  1,511.4
     Fuel and purchased power                                              128.2                    130.0
     Operations and maintenance                                            430.9                    406.0
     Depreciation, depletion and amortization                              112.3                    110.3
     Operating taxes                                                       122.6                    118.2
                                                         ------------------------------------------------
Total Operating Expenses                                                 2,466.7                  2,275.9
                                                         ------------------------------------------------
Income from equity investments                                               3.7                      3.4
Gain on sale of property                                                       -                      0.5
                                                         ------------------------------------------------
Operating Income                                                           399.5                    389.1
                                                         ------------------------------------------------
Other Income and (Deductions)
     Interest charges                                                      (61.6)                  (66.2)
     Other                                                                   8.2                    11.4
                                                         ------------------------------------------------
Total Other Income and (Deductions)                                        (53.4)                  (54.8)
                                                         ------------------------------------------------
Income Taxes
     Current                                                               177.2                   159.4
     Deferred                                                              (44.5)                  (33.1)
                                                         ------------------------------------------------
Total Income Taxes                                                         132.7                   126.3
                                                         ------------------------------------------------
Earnings for Common Stock                                              $   213.4                $  208.0
                                                         ================================================
                                                         ------------------------------------------------
Basic Earnings Per Share                                               $    1.22                $   1.19
                                                         ================================================
                                                         ------------------------------------------------
Diluted Earnings Per Share                                             $    1.21                $   1.18
                                                         ================================================
Average Common Shares Outstanding (000)                                  175,600                 174,704
Average Common Shares Outstanding - Diluted (000)                        176,855                 175,743
- ---------------------------------------------------------------------------------------------------------



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                               KeySpan Corporation
                               Segment Information
                        Three Months Ended March 31, 2007
                            (In Millions of Dollars)



                                                                                               Total
                                                Gas        Electric    Energy     Energy     Operating     Recon-         Total
                                           Distribution    Services   Services  Investments   Segments   ciliations   Consolidation
- ------------------------------------------------------------------------------------------------------------------------------------
                                                                                                    
 Unaffiliated Revenues                         2,415.5       384.4       52.6       10.0       2,862.5          -         2,862.5
 Intersegment Revenues                               -         3.9        2.1        1.3           7.3       (7.3)              -
                                           -----------------------------------------------------------------------------------------
                                               2,415.5       388.3       54.7       11.3       2,869.8       (7.3)        2,862.5
                                           -----------------------------------------------------------------------------------------

 Operation Expenses
 Purchased Gas                                 1,673.6         0.4          -          -       1,674.0       (1.3)        1,672.7

 Purchased Fuel                                      -       131.9          -        0.1         132.0       (3.8)          128.2

 Operations and Maintenance                      191.2       185.3       50.8        6.3         433.6       (2.7)          430.9

 Depreciation, Depletion and Amortization         79.9        25.1        2.1        2.2         109.3        3.0           112.3

 Operating Taxes                                  68.3        47.1        0.4        1.3         117.1        5.5           122.6

                                           -----------------------------------------------------------------------------------------
 Total  Operating Expenses                     2,013.0       389.8       53.3        9.9       2,466.0        0.7         2,466.7
                                           -----------------------------------------------------------------------------------------

 Income From Equity Investments                      -           -          -        3.7           3.7          -             3.7

                                           -----------------------------------------------------------------------------------------
 Operating Income                                402.5        (1.5)       1.4        5.1         407.5       (8.0)          399.5
                                           =========================================================================================




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                               KeySpan Corporation
                               Segment Information
                        Three Months Ended March 31, 2006
                            (In Millions of Dollars)





                                                                                               Total
                                                 Gas       Electric    Energy      Energy     Operating     Recon-         Total
                                            Distribution   Services   Services  Investments   Segments    ciliations   Consolidation
                                           -----------------------------------------------------------------------------------------
                                                                                                     
 Unaffiliated Revenues                         2,180.1       424.8       48.4         7.8      2,661.1           -         2,661.1
 Intersegment Revenues                               -           -        2.5         1.3          3.8        (3.8)              -
                                           -----------------------------------------------------------------------------------------
                                               2,180.1       424.8       50.9         9.1      2,664.9        (3.8)        2,661.1
                                           -----------------------------------------------------------------------------------------

 Operation Expenses
 Purchased Gas                                 1,512.6           -          -           -      1,512.6        (1.2)        1,511.4

 Purchased Fuel                                      -       130.0          -           -        130.0           -           130.0

 Operations and Maintenance                      190.4       155.3       48.9         6.7        401.3         4.7           406.0

 Depreciation, Depletion and Amortization         75.9        27.1        2.0         1.7        106.7         3.6           110.3

 Operating Taxes                                  64.8        47.4        0.4         1.3        113.9         4.3           118.2

                                           -----------------------------------------------------------------------------------------
 Total  Operating Expenses                     1,843.7       359.8       51.3         9.7      2,264.5        11.4         2,275.9
                                           -----------------------------------------------------------------------------------------

 Income From Equity Investments                      -           -          -         3.4          3.4           -             3.4

 Gain on Sale of Property                            -           -          -         0.2          0.2         0.3             0.5

                                           -----------------------------------------------------------------------------------------
 Operating Income                                336.4        65.0       (0.4)        3.0        404.0       (14.9)          389.1
                                           =========================================================================================




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