International Power Announces Development Agreement for 220MW Geothermal Power Plant in Indonesia

LONDON, June 15, 2011 -

International Power (IPR), PT Supreme Energy (Supreme Energy)
and Marubeni Corporation have entered into a joint venture
agreement for the development of the Rantau Dedap geothermal
project located in South Sumatra Province.

This agreement follows the appointment of Supreme Energy as
winner of the concession tender and the award of the geothermal
mining licence.  

Supreme Energy, IPR-GDF SUEZ Asia and Marubeni Corporation
constitute a partnership that brings a strong combination of
technical skills, geothermal expertise and IPP development and
experience to the power sector in Indonesia.

Supreme Energy will negotiate the Power Purchase Agreement with
PLN before further progressing the development of the power
plant.

The 220MW project in the Rantau Dedap region, in which IPR has a
35% interest, is part of the Indonesian government’s second
10,000MW accelerated electricity development programme.  It
will contribute to meeting the rising need for electricity in the
country, using renewable energy resources.

International Power is one of the leading power developers in
Indonesia with 1,280MW of operating assets and 815MW of capacity
under construction in this market.

About International Power

International Power plc is a leading independent electricity
generating company with 70,196MW (gross) (41,550MW net) in
operation and a significant pipeline of 17,249MW (gross) (6,826MW
net) projects under construction as at 31 December 2010.
International Power is listed on the London Stock Exchange with
ticker symbol IPR. Company website: www.iprplc-gdfsuez.com
GDF SUEZ holds a 70% interest in International Power plc, further
information about the GDF SUEZ Group is available at:
www.gdfsuez.com

About Supreme Energy

Supreme Energy was formed in 2007 by professionals with
extensive experience and knowledge of the energy service business
in Indonesia who have been very active and directly involved in the
oil and gas industry in geothermal development and operations in
Indonesia for the past ten years.  Supreme Energy won the
rights to carry out preliminary feasibility studies in three of the
best geothermal areas in Indonesia and successfully secured the
mining licences in all three in competitive tenders.

International Power Press and Investor
Contact:

Richard Treacher, +44-207-320-8788

.