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The Asian Development Bank (ADB) signed a USD 350 million financing package with Gulf Renewable Energy Company Limited (GRE), a subsidiary of Thailand's Gulf Development Public Company Limited (GULF), to fund three renewable-energy projects: two solar-plus-battery energy storage system (BESS) plants totaling 126 MW with 151 MWh of storage, and a 68 MW solar power plant. ADB provided USD 75 million from its own ordinary capital resources and acted as sole mandated lead arranger and bookrunner, mobilizing a further USD 275 million from a DBS Bank B-loan, parallel loans from DEG, Development Finance Institute Canada and Export Finance Australia, and the ADB-administered Leading Asia's Private Infrastructure Fund 2 (LEAP 2). The projects are expected to cut an average of 191,550 tons of CO2 emissions annually, supporting Thailand's 2050 net-zero target.

Thailand's Board of Investment issued Notification No. Sor. 5/2568 (5/2025), dated 5 June 2025, amending the Schedule of Investment-Promoted Activities under BOI Notification No. 9/2565 across roughly 32 activity categories, including machinery and automotive, electrical appliances and electronics, metals and materials, public utilities, digital, and creative industries. The revision extends standard BOI tax and import-duty investment-promotion incentives to accumulator/battery-cell manufacturing activities within these categories, while discontinuing promoted status for metal-cutting activities (Category 5.4.10). The notification applies to investment- promotion applications submitted on or after 1 July 2025, and was later published in the Royal Gazette on 22 January 2026.

On 19 December 2023, the Thai Cabinet endorsed the second phase of the national electric-vehicle support programme ("EV 3.5") covering 2024-2027, following its approval by the National Electric Vehicle Policy Committee. The Excise Department published the implementing Notification on 28 December 2023; the regime entered into force on 1 January 2024. EV 3.5 combines (i) per-vehicle purchase subsidies of THB 50,000-100,000 for battery-electric passenger cars and pick-ups, (ii) a reduction in excise duty on BEV passenger cars priced ≤ THB 7 million from 8% to 2%, and (iii) up to 40% import-duty relief on Completely Built-Up (CBU) BEV passenger cars priced ≤ THB 2 million during 2024-2025. Participating OEMs must offset CBU imports with domestic Thai production at a 1:2 ratio by end-2026 and 1:3 by end-2027, or face clawback of the granted incentives. The package is the operational successor to EV 3.0 (2022-2023) and was designed to lock in the wave of Chinese-OEM gigafactory and assembly investment that EV 3.0 attracted (BYD Rayong, MG/SAIC, GAC AION, Great Wall Motor, NETA, Changan, Chery). By the August 2025 EV-Board meeting Thailand had logged > THB 137 billion in approved EV-supply-chain investment under the combined EV 3.0 + EV 3.5 envelope. EV 3.5 is the central instrument in Thailand's "EV Hub of ASEAN" industrial strategy and the principal regional competitor to Indonesia's nickel-anchored EV-cluster bid and Vietnam's Decree 182 investment-support fund.