Electricity Generating PCL : 28 September 2017 Acquisition of additional interest in Darajat Geothermal Project in Indonesia

Energy for life

G R O U P

No. EGCO 110/606

Date: September 28, 2017

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ELECTRICITY GENERATING PUBLIC COMPANY LIMITED

222 EGCO Tower, 14th_ 15th Fl, Moo 5,

V 1blrnvad1 a,111ys1t Road, g

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T1mgsonghong, Laks1

Bangkok 10210. Thv1land Tel +M ID) 2996 599

Fax: +66 ID] 2955 0956-9 3

Attn: President of the Stock Exchange of Thailand

Subject: Acquisition of additional interest in Darajat Geothermal Project in Indonesia

The Electricity Generating Public Company Limited ("EGCO") would like to inform the Stock Exchange of Thailand that Star Energy Geothermal (Salak - Darajat) B.V. ("SEGSD"), the affiliate of EGCO (20.07% indirect ownership interest), Star Energy Group Holdings Pte. Ltd. and AC Energy Holdings, Inc. have entered into Share Sale and Purchase Agreements with PT Austindo Nusantara Jaya Tbk ("ANJ") on July 14, 2017 to acquire 95% share of PT Darajat Geothermal Indonesia ("DGI"). The share transfer was completed on September 27, 2017.

DGI holds the participating interest of 5% in Darajat Geothermal Project Unit 2 and Unit 3, which have total capacity of 216 MW. The transaction increases SEGSD's indirect ownership interest in Darajat Geothermal Project Unit 2 and 3 from 95% to 99.75% while SEGSD remains to hold 100% indirect ownership interest in Darajat Geothermal Project Unit 1.

This investment is in line with EGCO's strategic plan to expand its business in renewable power generation in South East Asia region and to enhance the company's growth in the long term.

The investment was not a connected transaction. Also, under the Stock Exchange of Thailand's requirements for notification on Acquisition and Disposal, the calculated transaction size based on criteria of net profit of EGCO's reviewed and consolidated financial statements as at June 30, 2017 is 0.12% which is less than the 15% threshold. Therefore, the transaction does not require disclosure under the rules, procedures and disclosure of information concerning the acquisition and disposition of assets of listed companies. However, the disclosure is disseminated in the case of the investment in a joint venture company with a proportion of 10% or more of its paid up capital.

Please be informed accordingly and kindly disseminate the information herein to investors .

Yours sincerely,

Chanin Chaonirattisai Director

Acting President

Corporate Secretary Division Tel. 02 998 5020-5