PTTEP Operations Overview

Core E&P Business Update Assets Transition in Thailand PTTEP G1/61 (Erawan) Delayed Site Access YY Starting producing below PSC volume Remediation Plan (accelerate ramp-up and uplift other fields) On track towards 1st gas in 2022 G2/61 (Bongkot) WHP Construction IIII Awarded drilling rig (ready to drill in Nov) GSA Finalized Stronger foothold in Malaysia SK410B Project • Under field development study reflecting larger gas discovery volume and CO2 management as per GHG aspiration target • FID target on track • Several petroleum prospects under study with additional drilling planned in 2022 SK438 Project Evaluating petroleum potential at Mak Yong-1, after gas discovery at Kulintang-1 (1st exploration well) in April 2021 PM407 Project Conducting 3D Seismic Reprocessing and preparing for exploration drilling campaign in 2022-2023 Potential Development Cluster in Sarawak, Malaysia and Installation (complete in Nov) Production boost in Oman Oman Block 61 Ramp up production to full capacity from 27 June 2021 • Gas: 1,500 MMSCFD Condensate: 69,000 BBL/D New volume in Algeria Algeria HBR Construction and commissioning on progress 1st oil production expected in 2H/2021 with capacity 10-13KBPD OMAN 14 Thailand Legend Producing Explorations Petroleum Discoveries South Sarawak Cluster SK309-311, SK314A, SK438, SK405B Bongkot Arthit PM415 Peninsular PM407 North Sarawak Cluster SK410B & SK417 ISK410B - SK417 Block H PFLNG2 Block K Sabah SK438 SK314A SK405B SK309/311 MLNG complex Sarawak

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