Exhibit 99.1

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


Contacts:    Investors                                     Media Relations
             George Laskaris
             718.403.2526                                   718.403.2503


                  KeySpan Announces Strong 2nd Quarter Results
                  --------------------------------------------
        KeySpan/National Grid Transaction Receives New Hampshire Approval
                         Settlement Reached in New York
                           Pro-Rata Dividend Approved

Brooklyn,  New York, August 3, 2007 - KeySpan  Corporation (NYSE: KSE) announced
consolidated earnings of $52.2 million or $0.30 per share for the second quarter
of 2007,  as  compared  to $49.4  million or $0.28 per share for the same period
last year.  For the six month  period  ended  June 30,  2007,  KeySpan  reported
consolidated  earnings of $265.6 million or $1.51 per share,  compared to $257.4
million or $1.47 per share for the same period last year.

These  favorable  results for both the quarter and  year-to-date  reflect higher
operating  income,  primarily  driven  by the  strong  performance  of  the  gas
distribution  segment  and lower  expenses  associated  with the  National  Grid
transaction,  partially  offset by lower  earnings in the electric  segment.  In
addition,  2007 results  reflect higher  financing and tax expenses  compared to
2006,  which  benefited  from the  settlement  of certain  New York City and IRS
issues in the second quarter of 2006.

"I am pleased with the impressive  results and the excellent  performance of our
core gas distribution business,  which benefited from strong customer demand. We
continued to demonstrate the organic growth of our gas distribution  system with
the addition of approximately  18,500 gas installations on a year-to-date basis.
We are on track to achieving our goal of $50 million in additional  gross profit
margin in the gas business," said Robert B. Catell,  KeySpan  Chairman and Chief
Executive  Officer.  "Although  our electric  business  reported  lower  results
primarily  due to  increased  competition  in the  New  York  City  market,  our
generation plants are well maintained and ready to meet the increasing demand in
both the New York City and Long Island markets.  Our financial condition remains
strong with a 49.4% debt to total capitalization ratio".

The  previously  announced  acquisition of KeySpan by National Grid continues to
move  forward  as the  required  federal  and  state  regulatory  approvals  are
progressing.  All federal and  shareholder  approvals have been  received.  With
respect to state approvals,  on July 16, 2007 the New Hampshire Public Utilities
Commission approved National Grid's acquisition of KeySpan and the merger of the
two  companies.  New York State is the final  regulatory  approval  necessary to
close the transaction.  On July 9, 2007,  National Grid filed a "joint proposal"





reflecting an agreement with Staff of the New York Public Service Commission and
other  parties on the  acquisition  of KeySpan.  Based on the latest  procedural
schedule,  the New York  Commission is expected to act on the joint  proposal on
August 22nd.

"I am  pleased  with the  recent  approval  received  in New  Hampshire  and the
settlement reached in New York. With these two significant events, we are now in
the final stages of completing the merger and bringing  significant  benefits to
our customers in New York," said Mr. Catell. "We expect the transaction to close
shortly after the New York State Commission  approval is received.  The National
Grid-KeySpan  merger will  provide  more than $600 million in savings to our gas
customers  in New York City and Long Island over the next five years,  on top of
additional  savings that will be realized by the Long Island Power Authority and
National Grid's upstate New York gas and electric customers.  These savings will
provide base rate  stability to our  customers  through 2012. We look forward to
completing the  transaction  this month and becoming an important part of one of
the largest and most efficient energy companies in the world."



Segment Highlights


Results in 2007 and 2006 are reported on an Operating Income basis as follows:
- -------------------------------------------------------------------------------------------------------------------
                                                                   2nd           2nd           YTD        YTD
           Operating Income / (Loss) [$ millions]                Quarter       Quarter        2007        2006
                                                                  2007          2006
- -------------------------------------------------------------- ------------ ------------- ------------ ------------
                                                                                                
Gas Distribution                                                      61.4          39.5        464.0        376.0
- -------------------------------------------------------------- ------------ ------------- ------------ ------------
Electric Services                                                     44.3          62.4         42.8        127.3
- -------------------------------------------------------------- ------------ ------------- ------------ ------------
Energy Investments                                                     5.5           3.7         10.5          6.7
- -------------------------------------------------------------- ------------ ------------- ------------ ------------
Energy Services                                                        2.0           2.0          3.4          1.6
- -------------------------------------------------------------- ------------ ------------- ------------ ------------
Total Operating Segments                                             113.2         107.6        520.7        511.6
- -------------------------------------------------------------- ------------ ------------- ------------ ------------
Other                                                                 20.2          (0.1)        12.2        (15.0)
                                                                      ----          -----        ----        ------
- -------------------------------------------------------------- ------------ ------------- ------------ ------------
Total Operating Income                                               133.4         107.5        532.9        496.6
- -------------------------------------------------------------- ------------ ------------- ------------ ------------




Key Operating Income Drivers by Segment

o    The Gas Distribution  segment,  which serves New York City, Long Island and
     New England,  reported second quarter operating income of $61.4 million, an
     increase  of $21.9  million or 55% over the same  period  last  year.  This
     period benefited from increased demand, new customer additions and improved
     pricing in the interruptible market.

     Year-to-date  results of $464  million  were $88 million or 23% higher than
     last year,  again  benefiting  from  increased  customer  demand due to the
     colder  weather in the first half of the year,  new customer  additions and
     increased margins in our interruptible heating market. Net revenues for the
     year  increased  $97.4  million,  offset in part,  by $10 million in higher
     operating expenses.  Weather for the first half of the year was 4-5% colder
     than  normal in all our  territories,  and 18% and 9% colder than last year
     for our New York and New England service territories,  respectively. Due to
     our strong marketing efforts, the Company continued to add customers in the
     first  half  of  2007  as  KeySpan  completed   approximately   18,500  gas
     installations, ahead of plan, which should add approximately $20 million in
     new gross profit  margin.  This puts us on track to meeting our goal of $50
     million in new gross profit margin.


                                       2



o    The Electric Services segment owns and operates 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 operating income of $44.3 million for the second
     quarter, a decrease of $18.1 million from last year. This was due, in part,
     to lower net energy and capacity revenues of $7.6 million from the
     Ravenswood generating plant, resulting primarily from new generating
     capacity added in New York City and lower hedging gains. In addition, the
     realized gain on the financial capacity swap, entered into in May 2006, was
     an expected $3.2 million lower than last year. The remaining decrease in
     operating income reflects higher operation expenses.

     Year-to-date  results of $42.8  million were $84.5  million  lower than the
     same period last year.  This reduction in operating  income  reflects lower
     net energy and  capacity  revenues  of $61.1  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
     differentials  and  the  dual  fuel  nature  of the  Ravenswood  plant.  In
     addition,  the realized gain on the financial capacity swap was an expected
     $13.1  million lower than last year.  The  remaining  decrease in operating
     income reflects higher operation expenses.

o    The Energy  Investments  segment reported operating income of $10.5 million
     for the first half of 2007,  compared to $6.7 million in 2006. This segment
     includes  the  Company's  complementary  assets in natural  gas  pipelines,
     storage and other energy  related  investments as well as our Seneca Upshur
     gas exploration and production operations.  These results primarily reflect
     higher earnings from TransGas,  the LNG trucking operations,  due to colder
     weather in the first half of the year and from equity  investments  as well
     as lower expenses.

o    The Energy Services segment includes  companies that provide energy related
     services  to  homes  and  businesses  in  the  New  York  City  and  Boston
     metropolitan  areas.  This  segment  reported an  operating  profit of $3.4
     million for the first half of 2006,  as  compared  to $1.6  million for the
     same period last year. This improved performance reflects higher profits in
     our communications business as well as lower expenses.

o    The "Other"  category  reported an  increase in  operating  income of $20.3
     million for the second quarter and $27.2 million  year-to-date  compared to
     last year.  This was  primarily  due to a decrease  in costs at the holding
     company level  including  those  related to the National Grid  transaction,
     corporate  advertising and employee benefit costs that are not allocated to
     the KeySpan operating segments.


                                       3



Financial Update

The Company was able to keep  interest  expense  flat on a  year-to-date  basis,
excluding the one time benefit of $6 million  associated with the 2006 favorable
tax  resolution  associated  with our New York City  Ravenswood  facility.  This
reflects the  refinancing  efforts of the Company  over the past several  years.
This has resulted in a fixed to float debt ratio of over 90%.

At   the   end   of   the    second    quarter    of   2007,    the    Company's
debt-to-total-capitalization   was  49.4%,   reflecting  our  continued   strong
financial position.

As previously announced,  the Company declared a quarterly common stock dividend
of $0.475 per share,  payable  August 1, 2007, to  shareholders  of record as of
July 11, 2007.  This dividend  payment  reflects an annual increase of $0.04 per
share over last year's dividend, and is the Company's 37th consecutive period of
paying a dividend as  KeySpan.  The 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%.

Pro-Rata Dividend

In  anticipation  of the  close of the  transaction  between  National  Grid and
KeySpan,  the Board of Directors  approved the payment of a pro-rata dividend to
shareholders of record one business day prior to the transaction close date with
National  Grid.  The amount of such dividend will be based on the number of days
elapsed  between July 9, 2007  (ex-dividend  date),  up to but not including the
closing  date.  Assuming the merger  closes on August 24th, a pro-rata  dividend
payment of 23.7 cents per share will be made to KeySpan shareholders.


- --------------------------------------------------------------------------------

A member of the Standard & Poor's 500 Index,  KeySpan Corporation  (NYSE:KSE) is
the largest distributor of natural gas in the Northeast, operating regulated gas
utilities in New York,  Massachusetts,  and New Hampshire that serve 2.6 million
customers. These customer-focused  businesses are complemented by a portfolio of
service companies that offer energy-related products, services, and solutions to
homes and businesses. KeySpan is also the largest electric generator in New York
State, with approximately  6,650 megawatts of generating  capacity that provides
power to 1.1 million customers of the Long Island Power Authority (LIPA) on Long
Island and supplies  approximately 25 percent of New York City's capacity needs.
KeySpan also operates LIPA's transmission and distribution system under contract
to LIPA.  In addition to these  assets,  KeySpan has  strategic  investments  in
pipeline  transportation,  distribution,  storage,  and production.  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.


                                       4




                               KeySpan Corporation
                        Consolidated Statement of Income

- -----------------------------------------------------------------------------------------------------------------------------------
                                                                   Three Months Ended June 30,            Six Months Ended June 30,
(In Millions of Dollars, Except Per Share Amounts)                   2007                2006              2007              2006
- ----------------------------------------------------------------------------------------------- -----------------------------------
                                                                                                              
Revenues
     Gas Distribution                                             $ 1,011.1           $  873.2           $ 3,426.6       $ 3,053.3
     Electric Services                                                457.7              444.2               842.2           869.0
     Energy Services                                                   52.4               50.4               104.9            98.7
     Energy Investments                                                 9.2                9.9                19.2            17.8
                                                            ---------------- ------------------ ------------------- ---------------
Total Revenues                                                      1,530.4            1,377.7             4,392.9         4,038.8
                                                            ---------------- ------------------ ------------------- ---------------
Operating Expenses
     Purchased gas for resale                                         649.4              539.8             2,322.1         2,051.2
     Fuel and purchased power                                         138.1              115.7               266.3           245.7
     Operations and maintenance                                       411.4              420.6               842.3           826.7
     Depreciation, depletion and amortization                         104.6              101.2               216.9           211.4
     Operating taxes                                                   98.7               95.8               221.2           214.0
                                                            ---------------- ------------------ ------------------- ---------------
Total Operating Expenses                                            1,402.2            1,273.1             3,868.8         3,549.0
Income from equity investments                                          4.9                2.9                 8.5             6.3
Sale of assets                                                          0.3                  -                 0.3             0.5
                                                            ---------------- ------------------ ------------------- ---------------
Operating Income                                                      133.4              107.5               532.9           496.6
                                                            ---------------- ------------------ ------------------- ---------------
Other Income and (Deductions)
     Interest charges                                                 (69.6)             (59.4)             (131.1)         (125.6)
     Other                                                             18.3                6.2                26.4            17.6
                                                            ---------------- ------------------ ------------------- ---------------
Total Other Income and (Deductions)                                   (51.3)             (53.2)             (104.7)         (108.0)
                                                            ---------------- ------------------ ------------------- ---------------
Income Taxes
     Current                                                           63.7              (37.3)              240.9           122.2
     Deferred                                                         (33.8)              42.2               (78.3)            9.0
                                                            ---------------- ------------------ ------------------- ---------------
Total Income Taxes                                                     29.9                4.9               162.6           131.2
                                                            ---------------- ------------------ ------------------- ---------------

                                                            ---------------- ------------------ ------------------- ---------------
Earnings for Common Stock                                         $    52.2           $   49.4           $   265.6       $   257.4
                                                            ================ ================== =================== ===============

                                                            ---------------- ------------------ ------------------- ---------------
Basic Earnings Per Share                                          $    0.30           $   0.28           $    1.51       $    1.47
                                                            ================ ================== =================== ===============

                                                            ---------------- ------------------ ------------------- ---------------
Diluted Earnings Per Share                                        $    0.29           $   0.28           $    1.50       $    1.46
                                                            ================ ================== =================== ===============
Average Common Shares Outstanding (000)                             175,845            174,989             175,733         174,846
Average Common Shares Outstanding - Diluted (000)                   177,220            176,121             177,048         175,848
- ----------------------------------------------------------------------------------------------- -----------------------------------



                                       5





                        KeySpan Corporation
                        Segment Information
                   Six Months Ended June 30, 2007
                      (In Millions of Dollars)


                                                                                               Total
                                       Gas           Electric       Energy       Energy      Operating      Recon-         Total
                                   Distribution       Services     Services    Investments    Segments    ciliations   Consolidation
                                 ---------------------------------------------------------------------------------------------------
                                                                                                      
 Unaffiliated Revenues                 3,426.6          842.2         104.9         19.2       4,392.9            -         4,392.9
 Intersegment Revenues                       -            3.9           4.7          2.6          11.2        (11.2)              -
                                 ---------------------------------------------------------------------------------------------------
                                       3,426.6          846.1         109.6         21.8       4,404.1        (11.2)        4,392.9
                                 ---------------------------------------------------------------------------------------------------

 Operation Expenses
 Purchased Gas                         2,324.2            0.5             -            -       2,324.7         (2.6)        2,322.1

 Purchased Fuel                              -          269.8             -          0.4         270.2         (3.9)          266.3

 Operations and Maintenance              368.7          384.8         101.1         12.8         867.4        (25.1)          842.3

 Depreciation, Depletion and
  Amortization                           151.9           50.5           4.2          4.2         210.8          6.1           216.9

 Operating Taxes                         118.4           97.4           0.9          2.4         219.1          2.1           221.2

                                 ---------------------------------------------------------------------------------------------------
 Total  Operating Expenses             2,963.2          803.0         106.2         19.8       3,892.2        (23.4)        3,868.8
                                 ---------------------------------------------------------------------------------------------------

 Income From Equity Investments              -              -             -          8.5           8.5            -             8.5

 Gain (Loss) on Sale of Assets             0.6           (0.3)            -            -           0.3            -             0.3

                                 ---------------------------------------------------------------------------------------------------
 Operating Income                        464.0           42.8           3.4         10.5         520.7         12.2           532.9
                                 ===================================================================================================





                                       6




                               KeySpan Corporation
                               Segment Information
                         Six Months Ended June 30, 2006
                            (In Millions of Dollars)


                                                                                             Total
                                       Gas           Electric      Energy      Energy      Operating      Recon-           Total
                                   Distribution      Services     Services   Investments    Segments    ciliations     Consolidation
                                ----------------------------------------------------------------------------------------------------
                                                                                                      
 Unaffiliated Revenues                  3,053.3         869.0        98.7         17.8      4,038.8            -            4,038.8
 Intersegment Revenues                        -             -         4.7          2.6          7.3         (7.3)                 -
                                ----------------------------------------------------------------------------------------------------
                                        3,053.3         869.0       103.4         20.4      4,046.1         (7.3)           4,038.8
                                ----------------------------------------------------------------------------------------------------

 Operation Expenses
 Purchased Gas                          2,053.7           0.1           -            -      2,053.8         (2.6)           2,051.2

 Purchased Fuel                               -         245.4           -          0.2        245.6          0.1              245.7

 Operations and Maintenance               366.9         350.5        96.9         14.0        828.3         (1.6)             826.7

 Depreciation, Depletion and
  Amortization                            145.0          52.2         4.0          3.5        204.7          6.7              211.4

 Operating Taxes                          111.8          93.5         0.9          2.5        208.7          5.3              214.0

                                ----------------------------------------------------------------------------------------------------
 Total  Operating Expenses              2,677.4         741.7       101.8         20.2      3,541.1          7.9            3,549.0
                                ----------------------------------------------------------------------------------------------------

 Income From Equity Investments               -             -           -          6.3          6.3            -                6.3

 Gain (Loss) on Sale of Assets              0.1             -           -          0.2          0.3          0.2                0.5

                                ----------------------------------------------------------------------------------------------------
 Operating Income                         376.0         127.3         1.6          6.7        511.6        (15.0)             496.6
                                ====================================================================================================




                                       7




                               KeySpan Corporation
                               Segment Information
                        Three Months Ended June 30, 2007
                            (In Millions of Dollars)



                                                                                            Total
                                       Gas         Electric    Energy        Energy       Operating       Recon-           Total
                                  Distribution     Services    Services    Investments     Segments     ciliations     Consolidation
                                 ---------------------------------------------------------------------------------------------------
                                                                                                     
 Unaffiliated Revenues                1,011.1         457.7       52.4           9.2       1,530.4              -          1,530.4
 Intersegment Revenues                      -             -        2.5           1.3           3.8           (3.8)               -
                                 ---------------------------------------------------------------------------------------------------
                                      1,011.1         457.7       54.9          10.5       1,534.2           (3.8)         1,530.4
                                 ---------------------------------------------------------------------------------------------------

 Operation Expenses
 Purchased Gas                          650.7             -          -             -         650.7           (1.3)           649.4

 Purchased Fuel                             -         137.8          -           0.3         138.1              -            138.1

 Operations and Maintenance             177.5         199.6       50.4           6.5         434.0          (22.6)           411.4

 Depreciation, Depletion and
   Amortization                          72.1          25.4        2.0           2.0         101.5            3.1            104.6

 Operating Taxes                         50.0          50.3        0.5           1.1         101.9           (3.2)            98.7

                                 ---------------------------------------------------------------------------------------------------
 Total  Operating Expenses              950.3         413.1       52.9           9.9       1,426.2          (24.0)         1,402.2
                                 ---------------------------------------------------------------------------------------------------

 Income From Equity Investments             -             -          -           4.9           4.9              -              4.9

 Gain (Loss) on Sale of Assets            0.6         (0.3)          -             -           0.3              -              0.3

                                 ---------------------------------------------------------------------------------------------------
 Operating Income                        61.4          44.3        2.0           5.5         113.2           20.2            133.4
                                 ===================================================================================================




                                       8




                               KeySpan Corporation
                               Segment Information
                        Three Months Ended June 30, 2006
                            (In Millions of Dollars)


                                                                                            Total
                                       Gas         Electric      Energy       Energy      Operating      Recon-         Total
                                   Distribution    Services     Services    Investments    Segments    ciliations   Consolidation
                                 ---------------------------------------------------------------------------------------------------
                                                                                                   
 Unaffiliated Revenues                   873.2       444.2         50.4           9.9       1,377.7          -           1,377.7
 Intersegment Revenues                       -           -          2.2           1.3           3.5       (3.5)                -
                                 ---------------------------------------------------------------------------------------------------
                                         873.2       444.2         52.6          11.2       1,381.2       (3.5)          1,377.7
                                 ---------------------------------------------------------------------------------------------------

 Operation Expenses
 Purchased Gas                           541.1           -            -             -         541.1       (1.3)            539.8

 Purchased Fuel                              -       115.4            -           0.2         115.6        0.1             115.7

 Operations and Maintenance              176.5       195.2         48.1           7.4         427.2       (6.6)            420.6

 Depreciation, Depletion and
  Amortization                            69.1        25.1          2.0           1.8          98.0        3.2             101.2

 Operating Taxes                          47.0        46.1          0.5           1.0          94.6        1.2              95.8

                                 ---------------------------------------------------------------------------------------------------
 Total  Operating Expenses               833.7       381.8         50.6          10.4       1,276.5       (3.4)          1,273.1
                                 ---------------------------------------------------------------------------------------------------

 Income From Equity Investments              -           -            -           2.9           2.9          -               2.9

                                 ---------------------------------------------------------------------------------------------------
 Operating Income                         39.5        62.4          2.0           3.7         107.6       (0.1)            107.5
                                 ===================================================================================================




                                    9