Holding(s) in Company

Scottish & Southern Energy PLC
20 March 2007



TR-1(i): notification of major interests in shares

1. Identity of the issuer or the underlying      Scottish & Southern Energy Plc
issuer of existing shares to which voting             --------------------
rights are attached(1):
-------------------------------

2. Reason for the notification (please tick the appropriate box or
boxes): n/a see additional information                                   -------
--------------------------------------------
An acquisition or disposal of voting rights                                
--------------------------------------------                            -------
An acquisition or disposal of financial instruments which may result       
in the acquisition of shares already issued to which voting rights are  -------
attached
--------------------------------------------
An event changing the breakdown of voting rights                           
--------------------------------------------                            -------
Other (please specify) Compliance with Transparency Directive              X
--------------------------------------------                            -------

3. Full name of person(s) subject to the        Capital Group International, Inc
notification obligation(1):                           --------------------
-------------------------------

4. Full name of shareholder(s) (if different
from 3.)(1):                                                --------------------
-------------------------------

5. Date of the transaction and date on which             15 March 2007
the threshold is crossed or reached(1):               --------------------
-------------------------------

6. Date on which issuer notified:                        16 March 2007
-------------------------------                       --------------------

7. Threshold(s) that is/are crossed or
reached:                                                                     3%
-------------------------------                             --------------------




8. Notified details:

A: Voting rights attached to shares

Class/   Situation previous to the   Resulting situation after the triggering
type of  Triggering transaction (1)  transaction(1)
shares
if
possible Number of     Number of     Number of     Number of voting     % of voting
using    Shares        Voting Rights shares        rights ix            rights
the ISIN               viii          Indirect      Direct Indirect xi   Direct Indirect
CODE                                               x

Ordinary  33,866,403    33,866,403    34,144,203           34,144,203           3.9615%
Shares


B: Financial Instruments

Resulting situation after the triggering transaction xii
Type of     Expiration Exercise/       Number of voting rights that may  % of
financial   date xiii  Conversion      be acquired if the instrument is  voting
instrument             Period/ Date    exercised/ converted.             rights
                       xiv
    N/A

Total (A+B)

Number of voting rights                 % of voting rights
34,144,203                              3.9615%



9. Chain of controlled undertakings through which the voting rights and/or the
financial instruments are effectively held, if applicable xv:


Proxy Voting:

9. Name of the proxy holder:

10. Number of voting rights proxy holder will cease to hold:

11. Date on which proxy holder will cease to hold voting rights:

                          
12. Additional information:

13. Contact name:

14. Contact telephone number:

Annex Notification of Major Interests in Shares

A: Identity of the person or legal entity subject to the notification obligation

Full name (including legal form for legal entities)         Capital Group
                                                          International, Inc

Contact address (registered office for legal          11100 Santa Monica Blvd.,
entities)                                                     15th Floor
                                                       Los Angeles, California
                                                                90025

Phone number                                                [phone]

Other useful information (at least legal
representative for legal persons)



B: Identity of the notifier, if applicable

Full Name                                                   Vivien Tan

Contact address                                              11100 Santa Monica
                                                             Blvd., 15th Floor
                                                                Los Angeles,
                                                              California 90025

Phone Number                                                   [phone]

Other useful information (e.g. functional relationship with   Fax: (213) 486 -
the person or legal entity subject to the notification              9698
obligation)
                                                                   Email:
                                                            [e-mail]

C: Additional Information



Notes to the Forms

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

(i) This form is to be sent to the issuer or underlying issuer and to be filed
with the competent authority.



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