# BYD and Geely expand Southeast Asian assembly lines to build regional export hubs

*Chinese electric vehicle manufacturers scale localized parts procurement across Thailand and Indonesia to meet ASEAN tariff thresholds.*

**Published:** August 28, 2026  
**By:** Lian Chen  
**Section:** Batteries & Electric Vehicles — China  
**Format:** Company Watch  

**Source:** https://eastasiabrief.com/batteries-ev/byd-geely-expand-southeast-asian-assembly-lines-build-regional-38  
**Publisher:** East Asia Brief (https://eastasiabrief.com/)

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## What to know

- The expansion centers on established industrial zones in Southeast Asia, notably the Eastern Economic Corridor in Thailand and the industrial clusters of West Java in Indonesia.
- BYD opened its passenger car manufacturing facility in Rayong Province, Thailand, with a planned annual nameplate capacity of 150,000 vehicles.
- Zhejiang Geely Holding Group is executing a dual-track strategy in the region through joint venture infrastructure and direct brand assembly.

![A man in a suit stands inside an automated vehicle assembly plant featuring robotic arms and car frames on a production line. (AI-generated image)](https://eastasiabrief.com/media/2026-08-28-de0db7051460.png)
*A man in a suit stands inside an automated vehicle assembly plant featuring robotic arms and car frames on a production line. (AI-generated image)*

BYD Company and Zhejiang Geely Holding Group are accelerating passenger vehicle assembly across manufacturing corridors in Thailand and Indonesia, transitioning preliminary knockdown kit operations into integrated production hubs. The capital expenditure drives by Chinese original equipment manufacturers reflect an operational pivot toward localized supply chain integration within the Association of Southeast Asian Nations. This strategic realignment responds directly to domestic value-addition mandates imposed by regional governments seeking to anchor component manufacturing within their borders.

The expansion centers on established industrial zones in Southeast Asia, notably the Eastern Economic Corridor in Thailand and the industrial clusters of West Java in Indonesia. Chinese manufacturers entered these territories initially through completely built-up vehicle imports supported by temporary import duty waivers and consumer subsidies. Under government subsidy frameworks such as Thailand's EV3.0 and EV3.5 packages, participating automakers committed to offsetting imported volumes with domestic assembly on a compensatory ratio. That policy deadline has forced automakers to activate full assembly facilities, move beyond semi-knocked-down assembly, and integrate localized pressing, welding, painting, and final assembly lines.

BYD opened its passenger car manufacturing facility in Rayong Province, Thailand, with a planned annual nameplate capacity of 150,000 vehicles. The complex encompasses complete vehicle production alongside dedicated facilities for battery pack integration using imported lithium iron phosphate cells. The Rayong plant serves as the production hub for right-hand-drive variants of the Dolphin hatchback, Atto 3 crossover, and Seal sedan, supplying the domestic Thai market and maritime export routes across the Asia-Pacific basin. BYD has structured its procurement operations to meet Thailand's local content requirements, engaging domestic stamping suppliers and harness manufacturers while preparing secondary phases for powertrain component fabrication.

Zhejiang Geely Holding Group is executing a dual-track strategy in the region through joint venture infrastructure and direct brand assembly. In Malaysia, Geely channels vehicle engineering and manufacturing operations through its partnership with Proton Holdings at the Tanjung Malim Automotive High-Tech Valley. In Indonesia, Geely is expanding manufacturing programs through local assembly contracts and dedicated facility plans to support commercial launch schedules for its multi-brand electric portfolio. At the same time, Geely's premium electric brand, Zeekr Intelligent Technology, and its smart Automobile joint venture with Mercedes-Benz Group have structured contract manufacturing and assembly agreements to serve right-hand-drive markets across Southeast Asia and Oceania.

The regional manufacturing buildup extends beyond BYD and Geely to encompass a broader cohort of Chinese automotive enterprises. SAIC Motor operates its passenger vehicle assembly facilities in Chonburi, Thailand, through a joint venture with Charoen Pokphand Group, while Great Wall Motor runs complete production lines at its converted facility in Rayong. In Indonesia, SAIC-GM-Wuling Automobile operates a manufacturing complex in Cikarang, West Java, producing compact electric vehicles such as the Air EV and BinguoEV. Hozon New Energy Automobile, which markets vehicles under the Neta brand, initiated commercial production at localized contract assembly facilities in both Bangkok, Thailand, and West Java, Indonesia.

To qualify for tariff exemptions under the ASEAN Free Trade Area agreements, automakers must demonstrate that vehicles manufactured in member states meet a Regional Value Content threshold of at least 40 percent. Achieving this origin criteria enables zero-tariff shipments across ASEAN signatories, including the Philippines, Vietnam, and Malaysia. For Chinese vehicle manufacturers, satisfying this rule requires building tier-one and tier-two supplier networks in Southeast Asia rather than relying entirely on sub-assemblies shipped directly from Chinese coastal factories.

Chinese automotive component suppliers have established operations alongside final vehicle assembly lines to support localization mandates. Battery manufacturers have led this industrial migration. Gotion High-Tech formed a joint venture with Thailand's PTT Group unit Nuovo Plus to assemble battery modules and packs in Rayong, while Contemporary Amperex Technology has deployed technology licensing and manufacturing partnerships across Indonesia and Thailand. SVOLT Energy Technology, an affiliate of Great Wall Motor, commissioned a battery module and pack assembly plant in Chonburi to supply regional assembly lines.

The localization process focuses primarily on structural stampings, seat assemblies, wiring harnesses, thermal management tubes, and low-voltage electrical systems. Tier-one suppliers, including Yanfeng Automotive Interiors, Minth Group, and Huafon Group, have purchased industrial land plots in Rayong, Chonburi, and Karawang to build local pressing and plastics facilities. For vehicle assemblers, sourcing high-cube, low-density parts within Southeast Asian industrial parks reduces maritime logistics expenses and shortens production lead times compared to shipping bulky interior panels and bumper systems from mainland China.

The local value additions in Thailand and Indonesia also function as a buffer against escalating trade barriers in Western markets. The United States maintains a 100 percent import tariff on Chinese electric vehicles under Section 301, while the European Commission has applied definitive countervailing duties ranging up to 35.3 percent on top of the standard 10 percent automotive tariff for battery electric vehicles shipped from China. Manufacturing right-hand-drive vehicles in Southeast Asia provides Chinese automakers with operational bases to export vehicles to Australia, New Zealand, the United Kingdom, South Africa, and Middle Eastern markets without triggering trade defense mechanisms specific to Chinese assembly plants.

The capital deployments in Southeast Asia carry operational trade-offs for participating automakers. Sourcing costs for specialized electrical steel, high-grade semiconductor modules, and battery active materials remain elevated across Southeast Asia due to the absence of domestic upstream chemical processing and precision fabrication plants. Automakers must import high-technology sub-components from China, Japan, or South Korea, which limits margin expansion on lower-priced vehicle models. Furthermore, production yields at newly commissioned assembly lines initially run below the efficiency benchmarks established at high-volume automotive plants in Shenzhen, Ningbo, or Guangzhou.

Vehicle price competition has intensified within Southeast Asian retail channels as localized assembly capacity comes online. In Thailand, introductory price reductions on locally assembled battery electric models have compressed dealer margins and forced legacy Japanese automakers to re-evaluate their regional production footprints. Japanese manufacturers, including Toyota Motor, Isuzu Motors, Honda Motor, and Mitsubishi Motors, hold entrenched market shares across Southeast Asia built on internal combustion engine utility vehicles and commercial pickup trucks. The entry of localized Chinese assembly lines has shifted consumer procurement trends in the entry-level and compact passenger vehicle categories.

The next phase of industrial policy implementation will shift government evaluations from vehicle assembly compliance to localized component verification. Thailand's Board of Investment and Excise Department have scheduled comprehensive audits of parts procurement manifests to verify that Chinese manufacturers fulfilled their EV3.0 production offset ratios. In Indonesia, the Ministry of Industry enforces progressive local content requirements that mandate electric four-wheelers to reach 60 percent local content to qualify for continued luxury sales tax exemptions.

## Impact map

| Event | Korea | China | Japan | Global impact |
| --- | --- | --- | --- | --- |
| ASEAN EV localization | battery cell supply competition | OEMs build offshore bases | legacy market share pressure | RHD vehicle supply reallocation |

## In this story

- **Companies:** BYD Company, Zhejiang Geely Holding Group, SAIC Motor, Great Wall Motor
- **Tickers:** 002594.SZ, 0175.HK, 600104.SS, 2333.HK
- **Exposed:** Contemporary Amperex Technology, Gotion High-Tech, Proton Holdings, Toyota Motor
- **Policy:** Subsidies, Tariffs, Economic Security
- **Impact:** Supply Chain, Capex, Pricing, Order Book

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Cite as: East Asia Brief, "BYD and Geely expand Southeast Asian assembly lines to build regional export hubs," August 28, 2026. https://eastasiabrief.com/batteries-ev/byd-geely-expand-southeast-asian-assembly-lines-build-regional-38