Holding(s) in Company

RNS Number:8473O
International Power PLC
19 August 2003



Schedule 10 - Notification of Major Interests in Shares







1   Name of company:



International Power plc







2   Name of shareholder having a major interest:



Merrill Lynch Investment Managers Limited





3   Please state whether notification indicates that it is in respect of holding
of the shareholder named in 2 above or in respect of a non-beneficial interest
or in the case of an individual holder if it is a holding of that person's
spouse or children under the age of 18:



As above





4   Name of registered holder(s) and, if more than one holder, the number of
shares held by each of them:



Nutraco Nominees Limited                    71,303,045



Possfund Nominees Limited                      523,582



Britel Nominees Limited                        635,875



Merrill Lynch Pensions Nominees Limited



A/C NONCERT                                  7,945,338



Merrill Lynch Pensions Nominees Limited         5,000



Treasury of the Government

of the Isle of Man



A/C 5                                          784,569



Treasury of the Government

of the Isle of Man



A/C 10                                         346,776



Stamford Nominees



A/C CHARTY                                     195,100



Chase Nominees Limited                      11,519,261



Nortrust Nominees Limited                   11,029,504



Bank of New York Nominees Limited            4,246,563



Junction Nominees Limited                   13,294,457



State Street Nominees Limited                1,616,887



Morgan Nominees Limited                      1,026,775



Other Names                                  8,827,237







5   Number of shares/amount of stock acquired:



Not known





6   Percentage of issued class:



Not known





7   Number of shares/amount of stock disposed:



Not known





8   Percentage of issued class:



Not known





9   Class of security:



Ordinary shares of 50 pence each





10  Date of transaction:



Not known





11  Date company informed:



19 August 2003





12  Total holding following this notification:



133,299,969



13  Total percentage holding of issued class following this notification:



11.98%



14  Contact name for queries:



1.  Investors                             Grant Jones

2.  Media                               Aarti Singhal





15 Contact telephone number:



1.  44-207-320-8619

2.  44-207-320-8681





16  Name of company official responsible for making notification:



Stephen Ramsay - Company Secretary





17  Date of notification:



19 August 2003




                      This information is provided by RNS
            The company news service from the London Stock Exchange
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