Exhibit 99.1

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


Contacts:    Investors                                      Media Relations
             George Laskaris                                  718.403.2503
             718.403.2526


              KeySpan Announces Increased Earnings Results for 2006
              -----------------------------------------------------
         National Grid and KeySpan Transaction Continues to Move Forward
                Company Raised Annual Dividend to $1.90 per Share

Brooklyn,  New  York,  February  22,  2007 -  KeySpan  Corporation  (NYSE:  KSE)
announced  consolidated  earnings of $434.2 million or $2.48 per share for 2006,
compared  to $388.0  million  or $2.28 per share  for  2005,  a 9%  increase  in
earnings per share. These results reflect strong operational  performance in the
face of a very warm winter and very cool  summer as well as the  addition of new
generation  capacity in the New York City market. In addition,  the 2006 results
include lower  interest and tax expense as well as  incremental  merger costs of
$27.1 million, primarily reflecting investment banking and other related fees.

For the quarter  ending  December 31, 2006,  consolidated  earnings  were $126.5
million or $0.72 per share, as compared to $114.8 million or $0.66 per share for
the same period last year,  a 9% increase in earnings per share.  These  results
were driven by lower  operating  expenses in the gas business,  as well as lower
consolidated tax expense.

"I am very pleased  with the results we were able to achieve in 2006",  said Mr.
Catell, Chairman and CEO. "Despite the extremely warm winter weather experienced
in both our heating  seasons,  the Company met its goal of achieving $50 million
in new gross profit margin in our gas business,  again  reinforcing the strength
of our marketing  program and  demonstrating the organic growth potential in our
service  territories.  Our  electric  business,  although  impacted by increased
competition  in the New York  City  market,  performed  exceptionally  well with
summer  plant  availability  in excess of 95%.  In  addition,  we  continued  to
maintain our strong  financial  position with increased cash flows and a debt to
total capitalization ratio of approximately 50%."

The  previously  announced  acquisition of KeySpan by National Grid continues to
move  forward.  National  Grid  and  KeySpan  have  received  all the  necessary
approvals,  except for the New York State Public Service  Commission and the New
Hampshire Public  Utilities  Commission.  Procedural  schedules have been set in
both states and the regulatory  proceedings  are well underway on the merger and
rate plans.

"I am very happy with the approval progress made during 2006 for our transaction
with National  Grid," said Mr. Catell.  "We are working very diligently with the
New York and New Hampshire state regulatory  commissions to receive approval for
this  transaction.  The integration  teams from both companies  continue to work





well together and have made  significant  progress in developing  organizational
structures  which will  complement  the strategies of the combined  entity.  The
selection of the senior  management  team is well  underway.  We look forward to
completing the transaction with National Grid by the middle of this year."

It should be noted the 2005 results  include a loss of $1.8 million or $0.01 per
share from  discontinued  operations,  representing  the sale of the  mechanical
contracting companies in the first half of 2005, and the non-cash charge of $6.6
million or $0.04 per share due to the change in  accounting  principle  from the
implementation of FIN 47 (Accounting for Conditional Asset Obligations).

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



- -------------------------------------------------------------- ------------ ------------- ------------ ------------
                                                                    4th           4th        YTD 2006     YTD 2005
           Operating Income / (Loss) [$ millions]                 Quarter       Quarter
           --------------------------------------                   2006          2005
- -------------------------------------------------------------- ------------ ------------- ------------ ------------
                                                                                                
Gas Distribution                                                     203.5         188.9        568.6        565.7
- -------------------------------------------------------------- ------------ ------------- ------------ ------------
Electric Services                                                     21.2          76.0        293.0        342.3
- -------------------------------------------------------------- ------------ ------------- ------------ ------------
Energy Investments                                                     4.1           4.0         15.5         20.6
- -------------------------------------------------------------- ------------ ------------- ------------ ------------
Energy Services                                                        0.8           4.0          5.3        (2.7)
- -------------------------------------------------------------- ------------ ------------- ------------ ------------
Total Operating Segments                                             229.6         272.9        882.4        925.9
- -------------------------------------------------------------- ------------ ------------- ------------ ------------
Other                                                                (34.4)         (9.8)       (54.9)       (18.1)
                                                                     ------         -----       ------       ------
- -------------------------------------------------------------- ------------ ------------- ------------ ------------
Total Operating Income                                               195.2         263.1        827.5        907.8
- -------------------------------------------------------------- ------------ ------------- ------------ ------------


2006 Weather
Operating  income  results for 2006 were  heavily  impacted by the very  unusual
winter and summer  weather we incurred.  In terms of heating  degree  days,  the
first and fourth quarter  heating  seasons were 15% and 20% warmer than the same
periods last year,  respectively,  while summer weather was 25% cooler than that
experienced in the prior year.

Key Operating Income Drivers by Segment

o    The Gas  Distribution  segment with 2.6 million  customers  serves New York
     City, Long Island and New England,  and reported  operating income for 2006
     of $568.6 million,  an increase of $2.9 million compared to last year. This
     increase was realized in spite of the  extremely  warm weather  noted above
     and lower customer usage due to the high gas price environment. These items
     reduced net revenues by $51.7 million  compared to 2005.  This decrease was
     offset by lower  operating  expenses of $54.7  million,  primarily due to a
     decrease in  uncollectibles.  It should be noted that these results include
     $57 million  from the weather  normalization  adjustments  and $9.1 million
     from  weather  hedges  put in  place.  The  Company  continued  to add  new
     customers as it completed 48,000 gas installations during 2006.

o    The Electric  Services  segment owns and operates  6,650MW of generation in
     the New York City and Long Island "load  pockets",  while also managing the
     Long Island Power  Authority's  transmission and distribution  system under
     long-term contracts. This segment reported operating income of $293 million
     for 2006, a decrease of $49.3 million, compared to 2005. These results were

                                       2




     heavily  impacted by the  addition of 1000MW of new  generation  in the New
     York City  market,  resulting  in a decrease in capacity  revenues of $80.5
     million compared to last year. In addition,  net energy revenues  decreased
     by $29.8 million  compared to last year,  due to a combination  of the cool
     summer weather noted earlier and the  additional  generation  capacity.  In
     terms of our LIPA  contracts,  operating  income  improved  by $11  million
     primarily  due to an increase in off system  sales and a reduction in plant
     overhaul  expenses.  In addition,  a $46.5  million  gain on the  financial
     capacity  swap was  recorded.  As reported in  previous  quarters,  KeySpan
     entered into a financial  capacity  transaction  with Morgan  Stanley for a
     three year period starting May 1, 2006, which settles on a monthly basis.

o    The Energy  Investments  segment reported operating income of $15.5 million
     for 2006,  compared to $20.6  million for 2005.  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  primarily  reflect  lower  earnings  from the
     Iroquois  gas  pipeline  system and from our LNG  trucking  operations.  It
     should  be noted  2005  results  included  the  earnings  from the  Premier
     Pipeline Company of Northern Ireland which was sold in 2005.

o    The Energy Services  segment  achieved an operating  profit of $5.3 million
     compared to a loss of $2.7 million  last year.  This  improved  performance
     reflects  higher  profits  and  operating  margins in our  engineering  and
     services  businesses  as well as in the Company's  fiber optic  operations.
     This segment  includes  companies that provide  energy related  services to
     homes and businesses in the New York City and Boston metropolitan areas.

Financial Update
During 2006, the Company  maintained its strong  financial  position.  Despite a
rising  interest  rate  environment,  the  Company  was able to reduce  interest
expenses  by $13.2  million to $256.1  million  compared to the same period last
year.  Resolution  of a New  York  City  tax  case  related  to  the  Ravenswood
generating  facility  resulted in half of this savings with the remaining coming
from improved capital  performance.  This is based on the Company's reduction of
outstanding  debt the past several years as well as the  refinancing  of debt to
lock in favorable interest rates.

At year end, the debt to  capitalization  ratio decreased to 49.9% from 50.7% at
the  end of 2005 on a GAAP  basis,  reinforcing  KeySpan's  "A"  quality  credit
rating.

In addition, cash flow from operations increased $655.3 million compared to last
year  due to  favorable  working  capital  requirements,  which  benefited  from
improved  collections  and  lower  priced  gas in  storage,  and from  lower tax
payments.

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 $51.6 million.

During the fourth quarter,  KeySpan's New York and Long Island gas  distribution
utilities issued $500 million in senior  unsecured notes in a private  placement
at a rate of 5.6%  with a  maturity  date of 2016.  The  proceeds  were  used to
replace current short term borrowings and for general working capital purposes.

                                       3




The Company declared an increased  quarterly common stock dividend of $0.475 per
share,  payable  February 1, 2007, to  shareholders  of record as of January 12,
2007.  This is the Company's third year of a dividend  increase,  as well as the
35th consecutive  quarter of paying a dividend,  building upon its long-standing
commitment of dividend  payments to its  shareholders.  The new annual  dividend
rate of $1.90 per share provides a yield of approximately 4.6%.

- --------------------------------------------------------------------------------
Investors  are  invited  to  listen  to the  KeySpan  Corporation  2006 Year End
Earnings Conference Call on:

Thursday, February 22, 2007, at  9:30 AM (EST)
Live Dial-in:  (800) 500-0311
International Dial-in: (719) 457-2698

Replay will begin two hours after completion of the call until 3/1/06
Replay Number: (888) 203-1112
International Replay Number: (719) 457-0820
Access Code: 2246531
The replay will begin two hours after the call.
Audio webcast available at http://investor.keyspanenergy.com
- --------------------------------------------------------------------------------

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  6,600 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: the occurrence of any event,  change or other circumstances that
could give rise to the termination of the major agreement with National Grid plc
or the  failure  of the  merger  to  close  for  any  reason;  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                    12-Months Ended
                                                                             December 31,                        December 31,
(In Millions of Dollars, Except Per Share Amounts)                    2006                 2005              2006             2005
- -----------------------------------------------------------------------------------------------------------------------------------
                                                                                                            
Revenues
     Gas Distribution                                             $ 1,413.8            $ 1,914.0       $ 5,062.6         $ 5,390.1
     Electric Services                                                446.0                553.9         1,880.6           2,042.7
     Energy Services                                                   55.6                 57.1           203.4             191.2
     Energy Investments                                                 8.8                 10.9            35.0              38.0
                                                          -------------------------------------------------------------------------
Total Revenues                                                      1,924.2              2,535.9         7,181.6           7,662.0
                                                          -------------------------------------------------------------------------
Operating Expenses
     Purchased gas for resale                                         918.8              1,391.2         3,331.5           3,597.3
     Fuel and purchased power                                         130.4                205.3           548.6             752.1
     Operations and maintenance                                       480.6                474.7         1,680.0           1,617.9
     Depreciation, depletion and amortization                         101.8                100.7           397.5             396.5
     Operating taxes                                                  101.1                104.0           411.2             407.1
                                                          -------------------------------------------------------------------------
Total Operating Expenses                                            1,732.7              2,275.9         6,368.8           6,770.9
                                                          -------------------------------------------------------------------------
Gain on sale of property                                                0.1                  0.5             1.6               1.6
Income from equity investments                                          3.6                  2.6            13.1              15.1
                                                          -------------------------------------------------------------------------
Operating Income                                                      195.2                263.1           827.5             907.8
                                                          -------------------------------------------------------------------------
Other Income and (Deductions)
     Interest charges                                                 (63.4)               (69.2)         (256.1)           (269.3)
     Sale of subsidiary stock                                             -                    -               -               4.1
     Cost of debt redemption                                              -                    -               -             (20.9)
     Minority interest                                                 (0.2)                (0.2)           (0.8)             (0.4)
     Other                                                             12.9                  7.0            39.1              16.6
                                                          -------------------------------------------------------------------------
Total Other Income and (Deductions)                                   (50.7)               (62.4)         (217.8)           (269.9)
                                                          -------------------------------------------------------------------------
Income Taxes
     Current                                                          (46.3)                86.6            57.9             206.6
     Deferred                                                          64.3                 (7.3)          117.6              32.7
                                                          -------------------------------------------------------------------------
Total Income Taxes                                                     18.0                 79.3           175.5             239.3
                                                          -------------------------------------------------------------------------
Earnings from Continuing Operations                                   126.5                121.4           434.2             398.6
                                                          -------------------------------------------------------------------------
Discontinued Operations
    Income (loss) from operations, net of tax                             -                    -               -              (4.1)
    Gain (loss) on disposal, net of tax                                   -                    -               -               2.3
                                                          -------------------------------------------------------------------------
    Loss from Discontinued Operations                                     -                    -               -              (1.8)
                                                          -------------------------------------------------------------------------
Cumulative Change in Accounting Principles, net of tax                    -                 (6.6)              -              (6.6)
                                                          -------------------------------------------------------------------------
Net Income                                                            126.5                114.8           434.2             390.2
Preferred stock dividend requirements                                     -                    -               -               2.2
                                                          -------------------------------------------------------------------------
Earnings for Common Stock                                         $   126.5            $   114.8       $   434.2         $   388.0
                                                          =========================================================================
Basic Earnings Per Share
  Continuing Operations, less preferred stock dividends           $    0.72            $    0.70       $    2.48         $    2.33
  Discontinued Operations                                                 -                    -               -             (0.01)
  Cumulative Change in Accounting Principles                              -                (0.04)              -             (0.04)
                                                          -------------------------------------------------------------------------
Basic Earnings Per Share                                          $    0.72            $    0.66       $    2.48         $    2.28
                                                          =========================================================================
Diluted Earnings Per Share
  Continuing Operations, less preferred stock dividends           $    0.71            $    0.69       $    2.46         $    2.32
  Discontinued Operations                                                 -                    -               -             (0.01)
  Cumulative Change in Accounting Principles                              -                (0.04)              -             (0.04)
                                                          -------------------------------------------------------------------------
Diluted Earnings Per Share                                        $    0.71            $    0.65       $    2.46         $    2.27
                                                          =========================================================================
Average Common Shares Outstanding (000)                             175,352              174,365         175,040           169,940
Average Common Shares Outstanding - Diluted (000)                   176,615              174,998         176,151           170,801
- -----------------------------------------------------------------------------------------------------------------------------------


                                       5






                               Segment Information
                      Twelve Months Ended December 31, 2006
                            (In Millions of Dollars)



                                                                                               Total
                                               Gas        Electric    Energy       Energy    Operating    Reconcili-       Total
                                           Distribution   Services   Investments   Services   Segments     ations      Consolidation
                                          ------------------------------------------------------------------------------------------
                                                                                                      
 Unaffiliated Revenues                        5,062.6     1,880.6       35.0         203.4      7,181.6          -          7,181.6
 Intersegment Revenues                              -           -        5.3           9.6         14.9      (14.9)               -
                                          ------------------------------------------------------------------------------------------
                                              5,062.6     1,880.6       40.3         213.0      7,196.5      (14.9)         7,181.6
                                          ------------------------------------------------------------------------------------------

 Operation Expenses
 Purchased Gas                                3,336.6         0.2          -             -      3,336.8       (5.3)         3,331.5

 Purchased Fuel                                     -       548.2        0.4             -        548.6          -            548.6

 Operations and Maintenance                     681.5       750.7       26.3         197.6      1,656.1       23.9          1,680.0

 Depreciation, Depletion & Amortization         266.7       102.2        7.3           8.3        384.5       13.0            397.5

 Operating Taxes                                209.2       186.8        4.2           1.8        402.0        9.2            411.2

                                          ------------------------------------------------------------------------------------------
 Total  Operating Expenses                    4,494.0     1,588.1        38.2        207.7      6,328.0       40.8          6,368.8
                                          ------------------------------------------------------------------------------------------

 Income From Equity Investments                     -           -        13.1            -         13.1          -             13.1

 Gain (Loss) on Sale of Assets                      -         0.5         0.3            -          0.8        0.8              1.6

                                          ------------------------------------------------------------------------------------------
 Operating Income                               568.6       293.0        15.5          5.3        882.4      (54.9)           827.5
                                          ==========================================================================================


                                       6









                               Segment Information
                      Twelve Months Ended December 31, 2005
                            (In Millions of Dollars)


                                                                                                Total
                                               Gas        Electric     Energy       Energy    Operating   Reconcili-       Total
                                          Distribution    Services   Investments   Services    Segments     ations     Consolidation
                                         -------------------------------------------------------------------------------------------
                                                                                                     
 Unaffiliated Revenues                        5,390.1      2,042.7        38.0       191.2     7,662.0          -          7,662.0
 Intersegment Revenues                              -          4.6         5.0        10.8        20.4      (20.4)               -
                                         -------------------------------------------------------------------------------------------
                                              5,390.1      2,047.3        43.0       202.0     7,682.4      (20.4)         7,662.0
                                         -------------------------------------------------------------------------------------------

 Operation Expenses
 Purchased Gas                                3,607.0         (0.2)          -           -     3,606.8       (9.5)         3,597.3

 Purchased Fuel                                     -        751.6         0.5           -       752.1           -           752.1

 Operations and Maintenance                     727.0        684.5        26.5       195.6     1,633.6       (15.7)        1,617.9

 Depreciation, Depletion & Amortization         277.0         91.7         6.8         7.6       383.1        13.4           396.5

 Operating Taxes                                213.5        178.6         3.8         1.5       397.4         9.7           407.1

                                         -------------------------------------------------------------------------------------------
 Total  Operating Expenses                    4,824.5       1,706.2       37.6       204.7     6,773.0        (2.1)        6,770.9
                                         -------------------------------------------------------------------------------------------

 Income From Equity Investments                     -            -        15.1           -        15.1           -            15.1

 Gain (Loss) on Sale of Property                  0.1          1.2         0.1           -         1.4         0.2             1.6

                                         -------------------------------------------------------------------------------------------
 Operating Income                               565.7        342.3        20.6        (2.7)      925.9       (18.1)          907.8
                                         ===========================================================================================


                                       7






                               Segment Information
                      Three Months Ended December 31, 2006
                            (In Millions of Dollars)


                                                                                            Total
                                    Gas          Electric        Energy       Energy       Operating      Reconcili-       Total
                               Distribution      Services     Investments     Services      Segments       ations      Consolidation
                               -----------------------------------------------------------------------------------------------------
                                                                                                      
 Unaffiliated Revenues             1,413.8          446.0           8.8           55.6         1,924.2           -          1,924.2
 Intersegment Revenues                   -              -           1.3            2.0             3.3        (3.3)               -
                               -----------------------------------------------------------------------------------------------------
                                   1,413.8          446.0          10.1           57.6         1,927.5        (3.3)         1,924.2
                               -----------------------------------------------------------------------------------------------------

 Operation Expenses
 Purchased Gas                       920.1              -             -              -           920.1        (1.3)           918.8

 Purchased Fuel                          -          130.3           0.1              -           130.4           -            130.4

 Operations and Maintenance          169.1          223.5           6.8           54.2           453.6        27.0            480.6

 Depreciation, Depletion &
  Amortization                        69.4           25.1           2.0            2.1            98.6         3.2            101.8

 Operating Taxes                      51.7           45.9           0.8            0.5            98.9         2.2            101.1

                               -----------------------------------------------------------------------------------------------------
 Total  Operating Expenses         1,210.3          424.8           9.7           56.8         1,701.6        31.1          1,732.7
                               -----------------------------------------------------------------------------------------------------

 Income From Equity Investments          -              -           3.6              -             3.6           -              3.6

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

                               -----------------------------------------------------------------------------------------------------
 Operating Income                    203.5           21.2           4.1            0.8           229.6       (34.4)           195.2
                               =====================================================================================================




                                       8







                               Segment Information
                      Three Months Ended December 31, 2005
                            (In Millions of Dollars)


                                                                                               Total
                                              Gas        Electric       Energy      Energy    Operating   Reconcili-       Total
                                          Distribution   Services     Investments   Services  Segments      ations     Consolidation
                                         -------------------------------------------------------------------------------------------
                                                                                                      
 Unaffiliated Revenues                       1,914.0        553.9          10.9       57.1     2,535.9           -          2,535.9
 Intersegment Revenues                             -            -           1.3        3.0         4.3        (4.3)               -
                                         -------------------------------------------------------------------------------------------
                                             1,914.0        553.9          12.2       60.1     2,540.2        (4.3)         2,535.9
                                         -------------------------------------------------------------------------------------------

 Operation Expenses
 Purchased Gas                               1,392.2          0.3             -          -     1,392.5        (1.3)         1,391.2

 Purchased Fuel                                    -        205.2           0.1          -       205.3           -            205.3

 Operations and Maintenance                    207.3        203.7           7.9       53.8       472.7         2.0            474.7

 Depreciation, Depletion & Amortization         69.6         24.1           1.9        1.9        97.5         3.2            100.7

 Operating Taxes                                56.1         44.7           0.9        0.4       102.1         1.9            104.0

                                         -------------------------------------------------------------------------------------------
 Total  Operating Expenses                   1,725.2        478.0          10.8       56.1     2,270.1         5.8          2,275.9
                                         -------------------------------------------------------------------------------------------

 Income From Equity Investments                    -            -           2.6          -         2.6           -              2.6

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

                                         -------------------------------------------------------------------------------------------
 Operating Income                              188.9         76.0           4.0        4.0       272.9        (9.8)           263.1
                                         ===========================================================================================



                                       9