BUYBACK: TPW: TrustPower Share Buyback

21 Jul 2010 10:39 am

TPW 21/07/2010 BUYBACK

REL: 1039 HRS TrustPower Limited

BUYBACK: TPW: TrustPower Share Buyback

TrustPower Building, Truman Lane, Te Maunga, Mount Maunganui Telephone (07) 574 4754 o Fax: (64 7) 574 4803

21 July 2010 Market Information Services Section New Zealand Exchange Limited

Wellington NOTICE TO NEW ZEALAND EXCHANGE LIMITED

For the purposes of Listing Rule 7.12.1 of the NZSX Listing Rules, this notice concerns those securities in TrustPower Limited ("TrustPower") that have been acquired on market by TrustPower on 20 July 2010. Details of the acquisition are as follows: a) Security Acquired Ordinary Shares ISIN NZTPWE0001S7 b) Number of securities acquired 7,129 c) Average consideration per security acquired $7.15 d) Payment type Cash Payment e) Not applicable f) Percentage of total securities acquired 0.002% g) Reason for acquisition Re-activation of a share buyback programme announced on 25 May 2010

h) Specific authority Director Resolution i) Any terms of the acquisition Not applicable j) Total number of ordinary shares after acquisition (including shares held as treasury stock) 315,751,872 k) Total number of ordinary shares in existence after acquisition and after deduction of treasury stock 315,320,351 l) Intentions for shares acquired Hold as Treasury Stock m) Date of acquisition 20 July 2010

Please contact me on (07) 574 4866 if you require further information.

Yours faithfully

Robert Farron Company Secretary End CA:00197470 For:TPW Type:BUYBACK Time:2010-07-21:10:39:19

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