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 Hart Scott Rodino and CFIUS Clearance

Brooklyn,  New York, August 3, 2006 - KeySpan  Corporation (NYSE: KSE) announced
consolidated earnings of $49.4 million or $0.28 per share for the second quarter
of 2006,  as  compared  to $16.2  million or $0.10 per share for the same period
last year. These favorable  results reflect higher operating income from the gas
distribution segment, as well as lower financing and tax expenses.

For the six month  period  ended June 30, 2006,  KeySpan  reported  consolidated
earnings of $257.4  million or $1.47 per share,  compared  to $250.6  million or
$1.51  per share for the same  period  last  year.  These  year-to-date  results
reflect increased  electric  operating income as well as the lower financing and
tax expenses noted above,  partially  offsetting the impact on operating results
of the very warm weather  experienced  during the first  quarter of this year in
the gas distribution segment.

Discontinued  operations reflected a loss of $1.8 million or $0.01 per share for
the three and six months  ended June 30, 2005,  respectively  as a result of the
sale of KeySpan's mechanical contracting business during the first half of 2005.

"I  am  particularly  pleased  with  the  solid  performance  of  our  core  gas
distribution business. The Company continues to add new gas customers in all our
service  territories.  In  spite  of  the  current  relatively  high  gas  price
environment,  we are on track to achieving  our new  customer  growth in the gas
business,  with a goal  for 2006 of close to $50  million  in new  gross  profit
margin," said Robert B. Catell,  KeySpan  Chairman and Chief Executive  Officer.
"Our  electric  business  is in top form and  ready to meet the ever  increasing
electric demand experienced by both Long Island and New York City. Our financial
condition remains strong with a 47.3% 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  filings and approvals
are progressing. KeySpan and National Grid filed a joint merger application with
the Federal Energy Regulatory Commission on May 25th. The companies also cleared
review by the Federal Trade  Commission  under the  Hart-Scott-Rodino  Antitrust
Improvements  Act on July 10 and the  Committee  of  Foreign  Investment  in the
United States (CFIUS) on July 12. In addition,  the merger approval  request and
long term rate plans for KeySpan's two New York gas distribution  utilities were


                                       8





filed with the New York Public Service Commission on July 20 which would provide
more than $500  million in savings to New York  City,  Long  Island and  upstate
customers.  Filings with the New Hampshire Public  Utilities  Commission and the
State of New Jersey Board of Public  Utilities  are expected in the next several
weeks.

"I am  pleased  with the  progress  made by  KeySpan  and  National  Grid on the
transaction as we have received several approvals and have submitted  additional
filings," said Mr. Catell.  "The integration process commenced in April and both
companies   are  working  well   together  to  realize  the  potential  of  this
transaction.  We will work very closely with the state regulatory commissions to
receive approval for this transaction which will provide substantial benefits to
our customers and investors.  We look forward to completing the transaction next
year."

Segment Highlights
Results in 2006 and 2005 are reported on an Operating Income basis as follows:


- -------------------------------------------------------------------------------------------------------------------
                                                                   2nd           2nd          YTD          YTD
           Operating Income / (Loss) [$ millions]                Quarter       Quarter       2006         2005
           --------------------------------------                  2006          2005
- -------------------------------------------------------------- ------------ ------------- ------------ ------------
                                                                                                
Gas Distribution                                                      39.5          30.4        376.0        422.3
- -------------------------------------------------------------- ------------ ------------- ------------ ------------
Electric Services                                                     62.4          65.7        127.3        116.7
- -------------------------------------------------------------- ------------ ------------- ------------ ------------
Energy Investments                                                     3.7           5.5          6.7         11.9
- -------------------------------------------------------------- ------------ ------------- ------------ ------------
Energy Services                                                        2.0         (2.8)          1.6        (5.6)
- -------------------------------------------------------------- ------------ ------------- ------------ ------------
Total Operating Segments                                             107.6          98.8        511.6        545.3
- -------------------------------------------------------------- ------------ ------------- ------------ ------------
Other                                                                (0.1)           4.4       (15.0)        (3.4)
                                                                     -----           ---       ------        -----
- -------------------------------------------------------------- ------------ ------------- ------------ ------------
Total Operating Income                                               107.5         103.2        496.6        541.9
- -------------------------------------------------------------- ------------ ------------- ------------ ------------


Operating  income  for the  second  quarter of 2006  increased  $4.3  million or
approximately  4%, to $107.5 million,  compared to 2005. These results primarily
reflect  higher  earnings  from the gas  distribution  segment  from  higher net
revenues, offset by lower capacity and energy margins at the Ravenswood plant in
the electric  business.  For the first half of 2006,  operating income decreased
$45.3 million or 8%, to $496.6 million,  compared to $541.9 million for the same
period last year.  The main  driver of this  decrease  was the gas  distribution
business, which was impacted by the unusually warm weather in the first quarter.
This was  partially  offset  by the  electric  segment  which  benefited  from a
financial  capacity  swap gain.  Both the quarter and year to date  results also
benefited from enhanced profitability in the Energy Services segment.

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 $39.5 million, an
     increase of $9.1  million over the same period last year,  benefiting  from
     increased net gas revenues and improved pricing in the temperature  control
     market.

     Year-to-date  results of $376  million were $46.3  million  lower than last
     year,  due to weather in the first  quarter  which was 15% warmer than last
     year,  substantially  higher gas prices and higher operating  expenses.  In
     spite of these  conditions,  the Company  continued to add customers in the
     first  half  of  2006  as  KeySpan  completed   approximately   19,000  gas
     installations,  consistent with plan,  which should add  approximately  $19


                                       9





     million in new gross profit margin. Net revenues for the year decreased $33
     million,  as the  favorable  impact of load growth  additions was more than
     offset by lower  usage per  customer  resulting  from the warm  weather and
     higher gas prices. The favorable  operating results from the second quarter
     partially  offset the impact of weather in the first quarter.  In addition,
     operating  expenses  increased  $13.5  million,  primarily  due  to  higher
     employee benefit related expenses and a larger provision for  uncollectible
     accounts driven by the impact of higher gas prices.

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 $62.4  million for the second
     quarter, a decrease of $3.3 million,  due primarily to lower net energy and
     capacity revenues from the Ravenswood generating plant, resulting primarily
     from new generating  capacity added in New York City.  Earlier in the year,
     KeySpan  entered into a fixed for float  unforced  capacity  financial swap
     with Morgan Stanley for a three year period,  which is settled on a monthly
     basis.  KeySpan  realized a gain of $17.7 million on this swap  transaction
     for the quarter, which is reflected in the results for this segment.

     Year-to-date  results of $127.3  million were $10.6 million higher than the
     same period last year,  primarily  reflecting  the gain from the  financial
     capacity swap. The Ravenswood  generating  plant  experienced a decrease in
     net revenues of $1 million.

o    The Energy  Investments  segment reported  operating income of $6.7 million
     for the first half of 2006, compared to $11.9 million in 2005. 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
     lower  earnings  from  KeySpan's  investment  in the  Iroquois gas pipeline
     system.  In addition,  2005 results  include the earnings  from the Premier
     pipeline company which was sold in 2005.

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 $1.6
     million for the first half of 2006,  as compared to a loss of $5.6  million
     incurred in the same period last year. This improved  performance  reflects
     higher gross profit and operating  margins in the engineering  division and
     residential equipment installation and service contract business.

Financial Update

Despite a rising  interest  rate  environment,  the  Company  was able to reduce
interest  expenses in the second  quarter by $13.2 million to $59.4  compared to
the same period last year.  Part of this reduction was the result of a favorable
tax  resolution  with New York  City  regarding  income  taxes  relating  to the
Ravenswood  generating  facility.  As a result of the  settlement of this issue,
KeySpan  reversed  a  previously  recorded  $6  million  interest  reserve.  The
remaining benefit stems from the Company's reduction of debt outstanding. At the
end of the second  quarter of 2006,  the Company's  debt-to-total-capitalization
improved to 47.3% from 50.7% at year end 2005,  reflecting our continued  strong
financial position.


                                        10




In addition,  two issues were  resolved  with the IRS regarding tax returns from
1996 to 1999 for predecessor  companies.  As a result of this settlement and the
settlement with New York City,  KeySpan realized a tax benefit of $16 million in
the second quarter.

The Company  declared a  quarterly  common  stock  dividend of $0.465 per share,
payable  August 1, 2006,  to  shareholders  of record as of July 12, 2006.  This
dividend payment reflects an annual increase of $0.04 per share over last year's
dividend,  and is the Company's 33rd consecutive  period of paying a dividend as
KeySpan, as the company continues to build upon its long-standing  commitment of
dividend  payments to its  shareholders.  The annual  dividend rate of $1.86 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  2006 2nd Quarter
Earnings Conference Call on:

                   Thursday, August 3, 2006 at 10:30 AM (EST)
                   ------------------------------------------

Live Dial-In Number: 866-564-7444
International Dial-In Number: 719-234-0008

Replay  will begin two hours after the call ends until  8/7//06  Replay Dial In:
888-203-1112

International Replay: 719-457-0820
Conference ID:  5254836


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







                                       11






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.




                                       12



                               KeySpan Corporation
                        Consolidated Statement of Income


- ---------------------------------------------------------------------------------------------------------------------------
                                                              Three Months Ended June 30,        Six Months Ended June 30,
(In Millions of Dollars, Except Per Share Amounts)                 2006            2005             2006            2005
- ---------------------------------------------------------------------------------------------------------------------------
                                                                                                      
Revenues
     Gas Distribution                                            $  873.2        $  821.1        $ 3,053.3       $ 2,846.5
     Electric Services                                              444.2           468.5            869.0           869.1
     Energy Services                                                 50.4            44.2             98.7            88.6
     Energy Investments                                               9.9             8.7             17.8            18.8
                                                          -----------------------------------------------------------------
Total Revenues                                                    1,377.7         1,342.5          4,038.8         3,823.0
                                                          -----------------------------------------------------------------
Operating Expenses
     Purchased gas for resale                                       539.8           501.6          2,051.2         1,810.5
     Fuel and purchased power                                       115.7           159.2            245.7           292.3
     Operations and maintenance                                     420.6           391.8            826.7           779.0
     Depreciation, depletion and amortization                       101.2            97.5            211.4           203.6
     Operating taxes                                                 95.8            94.0            214.0           205.8
                                                          -----------------------------------------------------------------
Total Operating Expenses                                          1,273.1         1,244.1          3,549.0         3,291.2
Income from equity investments                                        2.9             4.7              6.3            10.0
Sale of assets                                                          -             0.1              0.5             0.1
                                                          -----------------------------------------------------------------
Operating Income                                                    107.5           103.2            496.6           541.9
                                                          -----------------------------------------------------------------
Other Income and (Deductions)
     Interest charges                                               (59.4)          (72.6)          (125.6)         (132.7)
     Gain on sale of investments                                        -               -                -             4.1
     Cost of debt redemption                                            -               -                -           (20.9)
     Other                                                            6.2             4.1             17.6            13.2
                                                          -----------------------------------------------------------------
Total Other Income and (Deductions)                                 (53.2)          (68.5)          (108.0)         (136.3)
                                                          -----------------------------------------------------------------
Income Taxes
     Current                                                        (37.3)           16.0            122.2           144.8
     Deferred                                                        42.2            (0.2)             9.0             6.2
                                                          -----------------------------------------------------------------
Total Income Taxes                                                    4.9            15.8            131.2           151.0
                                                          -----------------------------------------------------------------
Earnings from continuing operations                                  49.4            18.9            257.4           254.6
Discontinued Operations
    Income (loss) from discontinued operations, net of tax              -            (1.9)               -            (4.1)
    Gain on disposal, net of tax                                        -             0.1                -             2.3
                                                          -----------------------------------------------------------------
Loss from discontinued operations                                       -            (1.8)               -            (1.8)
                                                          -----------------------------------------------------------------
Net Income                                                           49.4            17.1            257.4           252.8
Preferred stock dividend requirements                                   -             0.9                -             2.2
                                                          -----------------------------------------------------------------
Earnings for Common Stock                                        $   49.4        $   16.2        $   257.4       $   250.6
                                                          =================================================================
Basic Earnings Per Share:
  Continuing Operations,
         less preferred stock dividends                          $   0.28        $   0.11        $    1.47       $    1.52
  Discontinued Operations                                               -           (0.01)               -           (0.01)
                                                          -----------------------------------------------------------------
Basic Earnings Per Share                                         $   0.28        $   0.10        $    1.47       $    1.51
                                                          =================================================================
Diluted Earnings Per Share
  Continuing Operations,
         less preferred stock dividends                          $   0.28        $   0.10        $    1.46       $    1.52
  Discontinued Operations                                               -           (0.01)               -           (0.01)
                                                          -----------------------------------------------------------------
Diluted Earnings Per Share                                       $   0.28        $   0.09        $    1.46       $    1.51
                                                          =================================================================
Average Common Shares Outstanding (000)                           174,989         169,933          174,846         165,529
Average Common Shares Outstanding - Diluted (000)                 176,121         170,878          175,848         166,507
- ---------------------------------------------------------------------------------------------------------------------------

                                       13




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


                                                                           Energy                  Total                   Total
                                                 Gas          Electric     Invest-    Energy     Operating    Reconci-    Consoli-
                                             Distribution     Services      ments     Services    Segments    liations    dation
                                           -----------------------------------------------------------------------------------------
                                                                                                     
 Unaffiliated Revenues                              873.2       444.2         9.9       50.4      1,377.7           -      1,377.7
 Intersegment Revenues                                  -           -         1.3        2.2          3.5        (3.5)           -
                                           -----------------------------------------------------------------------------------------
                                                    873.2       444.2        11.2       52.6      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         7.4       48.1        427.2        (6.6)       420.6

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

 Operating Taxes                                     47.0        46.1         1.0        0.5         94.6         1.2         95.8

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

 Income From Equity Investments                         -           -         2.9          -          2.9           -          2.9

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



                                       14




                               Segment Information
                        Three Months Ended June 30, 2005
                            (In Millions of Dollars)


                                                                          Energy                    Total                   Total
                                                 Gas         Electric     Invest-       Energy    Operating     Reconci-    Consoli-
                                            Distribution     Services      ments       Services    Segments     liations    dation
                                           -----------------------------------------------------------------------------------------
                                                                                                      
 Unaffiliated Revenues                             821.1        468.5        8.7           44.2     1,342.5            -    1,342.5
 Intersegment Revenues                                 -            -          -            3.7         3.7         (3.7)       0.0
                                           -----------------------------------------------------------------------------------------
                                                   821.1        468.5        8.7           47.9     1,346.2         (3.7)   1,342.5
                                           -----------------------------------------------------------------------------------------

 Operation Expenses
 Purchased Gas                                     501.6            -          -              -       501.6            -      501.6

 Purchased Fuel                                        -        159.0        0.1              -       159.2            -      159.2

 Operations and Maintenance                        175.2        176.6        5.2           48.3       405.3        (13.5)     391.8

 Depreciation, Depletion and Amortization           67.1         23.1        1.8            2.0        94.1          3.4       97.5

 Operating Taxes                                    46.6         44.1        0.9            0.4        92.0          2.0       94.0

                                           -----------------------------------------------------------------------------------------
 Total  Operating Expenses                         790.6        402.8        8.1           50.7     1,252.2         (8.1)   1,244.1
                                           -----------------------------------------------------------------------------------------

 Income From Equity Investments                        -            -        4.7              -         4.7            -        4.7

 Gain (Loss) on Sale of Assets                         -            -        0.1              -         0.1            -        0.1

                                           -----------------------------------------------------------------------------------------
 Operating Income                                   30.4         65.7        5.5           (2.8)       98.8          4.4      103.2
                                           =========================================================================================



                                       15





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


                                                                           Energy                  Total                     Total
                                                   Gas         Electric    Invest-    Energy      Operating    Reconci-     Consoli-
                                              Distribution     Services     ments    Services     Segments     liations      dation
                                             ---------------------------------------------------------------------------------------
                                                                                                      
 Unaffiliated Revenues                            3,053.3        869.0       17.8       98.7      4,038.8           -       4,038.8
 Intersegment Revenues                                  -            -        2.6        4.7          7.3        (7.3)            -
                                             ---------------------------------------------------------------------------------------
                                                  3,053.3        869.0       20.4      103.4      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       14.0       96.9        828.3        (1.6)        826.7

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

 Operating Taxes                                    111.8         93.5        2.5        0.9        208.7         5.3         214.0

                                             ---------------------------------------------------------------------------------------
 Total  Operating Expenses                        2,677.4        741.7       20.2      101.8      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        6.7        1.6        511.6       (15.0)        496.6
                                             =======================================================================================




                                       16






                               Segment Information
                         Six Months Ended June 30, 2005
                            (In Millions of Dollars)


                                                                            Energy                  Total                    Total
                                                   Gas         Electric     Invest-    Energy     Operating     Reconci-    Consoli-
                                              Distribution     Services     ments      Services   Segments      liations    dation
                                            ----------------------------------------------------------------------------------------
                                                                                                      
 Unaffiliated Revenues                            2,846.5        869.1       18.8        88.6      3,823.0           -      3,823.0
 Intersegment Revenues                                  -          4.6          -         6.3         10.9       (10.9)           -
                                            ----------------------------------------------------------------------------------------
                                                  2,846.5        873.6       18.8        94.9      3,833.8       (10.9)     3,823.0
                                            ----------------------------------------------------------------------------------------

 Operation Expenses
 Purchased Gas                                    1,815.1            -          -           -      1,815.1        (4.6)     1,810.5

 Purchased Fuel                                         -        291.9        0.3           -        292.3         0.0        292.3

 Operations and Maintenance                         356.9        330.2       11.7        95.8        794.7       (15.7)       779.0

 Depreciation, Depletion and Amortization           143.9         46.0        3.2         3.9        196.9         6.7        203.6

 Operating Taxes                                    108.4         88.8        1.8         0.8        199.7         6.1        205.8

                                            ----------------------------------------------------------------------------------------
 Total  Operating Expenses                        2,424.2        756.9       17.0       100.5      3,298.6        (7.5)     3,291.2
                                            ----------------------------------------------------------------------------------------

 Income From Equity Investments                         -            -       10.0           -         10.0           -         10.0

 Gain (Loss) on Sale of Assets                          -            -        0.1           -          0.1           -          0.1

                                            ----------------------------------------------------------------------------------------
 Operating Income                                   422.3        116.7       11.9        (5.6)       545.4        (3.4)       541.9
                                            ========================================================================================




                                       17