Five-Year Investment PlanBangkok, Thailand

16 December 2019

Forward-looking Information

The information, statements, forecasts and projections contained herein reflect the Company’s current views with respect to future events and financial performance. These views are based

on assumptions subject to various risks. No assurance is given that these future events will occur, or that the Company’s assumptions are correct. Actual results may differ materially from

those projected.

Petroleum Reserves Information

In this presentation, the Company discloses petroleum reserves that are not included in the Securities Exchange and Commission of Thailand (SEC) Annual Registration Statement Form 56-

1 under “Supplemental Information on Petroleum Exploration and Production Activities”. The reserves data contained in this presentation reflects the Company’s best estimates of its

reserves. While the Company periodically obtains an independent audit of a portion of its proved reserves, no independent qualified reserves evaluator or auditor was involved in the

preparation of reserves data disclosed in this presentation. Unless stated otherwise, reserves are stated at the Company’s gross basis.

This presentation may contain the terms “proved reserves” and “probable reserves”. Unless stated otherwise, the Company adopts similar description as defined by the Society of Petroleum

Engineers.

Proved Reserves - Proved reserves are defined as those quantities of petroleum which, by analysis of geological and engineering data, can be estimated with reasonable certainty to be

commercially recoverable, from a given date forward, from known reservoirs and under current economic conditions, operating methods, and government regulations.

Probable Reserves - Probable reserves are defined as those unproved reserves which analysis of geological and engineering data suggests are more likely than not to be recoverable.

Disclaimer

2

Investment StrategyFirst priority with business transition and resources discovery

3

Full Value Creation onExisting Assets

Ensuring Smooth Business Transition & Production Continuity

Pursue M&A in focus areas

Acceleration of Exploration Activities

New Business Opportunities

Deliver production volume as committed from 2022-2023

Maximize sales volume and ensure 1st gas for Block H in 2020

Maintain sales volume

Develop cluster with operational synergy and accelerate time to market for SK410B

G1/61 and G2/61 :

Newly Acquired Assets from Murphy :

Newly Acquired Assets from Partex :

Malaysia

MyanmarProve up gas potential in MD-7

Sustain plateau on legacy assets

Monetize development projects i.e. Mozambique Area 1 and Algeria HBR

Establish Gas to Power business in MyanmarFurther expand AI&Robotics ventures

Growing with “Coming Home to SEA” and “Strategic Alliance in ME”

HPO SVCGRC

Sustainable Development Framework

0

100

200

300

400

500

2019* 2020 2021 2022 2023 2024

Other SEA

Rest of World

Unit : KBOED450 464 467

348388 403

Thailand &MTJDA

Strong base volumes in South East AsiaFive –Year Plan : Sales Volume

71 : 29 67 : 33 69 : 31 67 : 33 67 : 33 71 : 29

Algeria HBR(Full phase)

Capacity 50-60 KBPD

Mozambique LNGCapacity 12.88 MTPA

Algeria HBR (phase l)Capacity 10-13 KBPD

Southwest Vietnam**Capacity 490 MMSCFD

Block HCapacity 270 MMSCFD

SK410B** Initial Capacity 300-500 MMSCFD

4

G2/61***Capacity 200 MMSCFD

(April 2022)

G1/61***Capacity 800 MMSCFD G2/61***

Capacity 700 MMSCFD(March 2023)

Note: * Closing forecast for FY2019** Subject to regulatory approval and FID timing*** According to Production Sharing Contracts signed on 25 February 2019

Product Mix (%)Gas : Liquid

Key Project Start-up

981 2,222 2,504 2,574 2,182 1,933 216

425 507 768

691 433 1,318

1,966 2,000

1,995 2,462

1,957 3,044

0

2,000

4,000

6,000

2019* 2020 2021 2022 2023 2024

Unit : MMUSD

4,613

5 Years (2020 – 2024)

5,559

OPEX

CAPEX(Producing projects*****)

CAPEX 14,239OPEX 10,380TOTAL 24,619

CAPEX(Dev & Pre-sanction projects****)

Note: * Closing forecast for FY2019** Subject to regulatory approval and FID timing*** According to Production Sharing Contracts signed on 25 February 2019**** Development & Pre-sanction projects include Mozambique LNG , Sabah H, Algeria HBR, SK410B and Southwest Vietnam***** Includes exploration and appraisal in all projects and head office CAPEX

Algeria HBR (Full phase)

Capacity 50-60 KBPD

Mozambique LNGCapacity 12.88 MTPA Algeria HBR (phase l)

Capacity 10-13 KBPD

Acquisitions5,011

5,337 5,335

4,323

Southwest Vietnam**Capacity 490 MMSCFD

Five –Year Plan : Investment PlanSupport current operations, business transitions and drive development projects for near term volume additions

Block HCapacity 270 MMSCFD

SK410B**Initial Capacity 300-500 MMSCFD

5

G2/61***Capacity 200 MMSCFD

(April 2022)

G1/61***Capacity 800 MMSCFD

G2/61***Capacity 700 MMSCFD

(March 2023)

Key Project Start-up

2 wellsin Mexico

1 wellin UAE

3 wellsin Myanmar

11 wellsin Malaysia

Exploration Plan in 2020

CAPEX281 MMUSD 343

MMUSD

2020 BudgetOPEX

62 MMUSD

Note: Excludes exploration activities of certain producing and pre development assets

Accelerate Exploration activities mainly in Malaysia

6

1 wellin Thailand

You can reach the Investor Relations team for more information and inquiry through the following channels:

http://www.pttep.com

Thank you and Q&A

+66 2 537 4000

IR@pttep.com

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