PT Medco Energi Internasional Tbk : MedcoEnergi Secures Concession Extension for Bualuang Oil Field in Thailand

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PT Medco Energi Internasional Tbk Tel +62-21 2995 3000 The Energy 53 rd Fl., SCBD Area Lot 11 A Fax +62-21 2995 3001 Jl. Jend. Sudirman, Jakarta 12190 https://www.medcoenergi.com Indonesia MedcoEnergi Secures Production Period Extension for Bualuang Oil Field in Thailand Jakarta, August 21, 2025 - PT Medco Energi Internasional Tbk ("MedcoEnergi") is pleased to announce that its subsidiaries, Medco Energi Thailand (Bualuang) Limited and Medco Energi Thailand (E&P) Limited, have received approval from the Government of Thailand for an extension of the production period for the Bualuang Oil Field (Block B8/38) in the Gulf of Thailand. The production period has been extended until October 23, 2035, allowing the Company to continue its operations and further strengthen its commitment to the region. The Company's long-term development plan aims to enhance Bualuang's production and maximize asset value through investment in facility debottlenecking, workovers, development drilling, and near-field exploration. Roberto Lorato Director & Chief Executive Officer of MedcoEnergi said, "We are proud to receive this extension, which underscores our commitment to operational excellence and sustainable development in Thailand, while rewarding our investment proposition." Anastasia Mustika, General Manager of Medco Energi Thailand added, "MedcoEnergi expresses its gratitude to the Government of Thailand, as well as to all stakeholders, including the Department of Mineral Fuels, local communities and contractors, for their support and collaboration in making this extension possible. This achievement reaffirms the Company's long-term commitment to responsible energy production." The Bualuang production period extension aligns with MedcoEnergi's strategic priorities to ensure sustainable growth and strengthen its position as a leading energy company in Southeast Asia. PT Medco Energi Internasional Tbk ("MedcoEnergi") is a leading Southeast Asian energy and natural resources company listed on the Indonesia Stock Exchange (MEDC-IDX). MedcoEnergi has three key business segments, Oil & Gas, Power and Copper Mining. MedcoEnergi explores for and produces oil and gas primarily in Indonesia. The Group operates gas, PV, geothermal and hydro power plants in Indonesia through Medco Power and has a non-consolidated interest in PT Amman Mineral Internasional Tbk which operates a large copper and gold mine. This document may contain projections, plans, strategies, policies and objectives of MedcoEnergi which should be treated as forward looking statements within the meaning of applicable law. Forward looking statements, by their nature, involve risks and uncertainties that could cause actual results to differ materially from those expressed or implied in these statements. The Company does not guarantee that any action taken in reliance on this document will bring specific results. For further information please call: Corporate Secretary | Investor Relations | Tel: (62-21) 2995 3000, Fax: (62-21) 2995 3001 Email: [email protected] | [email protected] Website: https://www.medcoenergi.com

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