BYD’s Thailand factory opened in 2025 with a 150,000 units per year production capacity. It is the first Chinese EV manufacturer to build a major production facility outside of China. It is not in Europe, not in the United States, not in South America. It is in Rayong, Thailand.

That location choice is the whole story.

Southeast Asia is the world’s most consequential undecided automobile market. The region has 680 million people, rising incomes, rapidly expanding urban middle classes, and an existing auto market dominated so completely by Japanese manufacturers — Toyota, Honda, Mitsubishi, Isuzu — that the phrase “Japanese car” and “car” are practically synonymous across Thailand, Indonesia, Vietnam, and the Philippines.

That dominance is 50 years in the building. Toyota entered Thailand in 1962. Honda in Indonesia in 1971. Mitsubishi across the region through the 1970s and 1980s. They built not just dealership networks and manufacturing plants, but the entire supply chain infrastructure — local parts suppliers, mechanics trained on their systems, fuel distribution networks calibrated to their engines. This is lock-in at civilisational scale.

China’s EV push is the first genuine challenge to Japanese dominance in Southeast Asian automotive history. The winner of this transition — whoever controls the EV market in Southeast Asia over the next 30 years — controls the most important emerging auto market outside of China and India.

China’s EV cost advantage over Japanese, Korean, and European automakers is structural, not cyclical. It is the result of a decade of government subsidies (approximately CNY 200 billion in EV consumer and industry subsidies between 2010 and 2022, Ministry of Finance China), coordinated supply chain development (China processes approximately 60% of the world’s cobalt, 80% of battery cathode materials, and manufactures approximately 75% of global lithium-ion cells), and the learning curve effect of manufacturing at scale — BYD alone produced 3 million EVs in 2023, more than any other single manufacturer globally.

The result: BYD’s Atto 3 — a mid-size SUV with 420km range — retails in Thailand at approximately THB 1.3 million (~US$36,000). A comparable Toyota RAV4 (ICE) is approximately THB 1.4 million (~US$39,000). A Toyota RAV4 Hybrid is THB 1.7 million (~US$47,000). BYD is now price-competitive with Japanese ICE vehicles and significantly cheaper than comparable Japanese hybrids — in the middle of the market where the volume is.

This pricing was not possible three years ago. It is possible now because BYD’s battery cost has fallen approximately 80% since 2013 (BloombergNEF battery price survey). The technology trajectory continues downward.

Thailand is the most advanced. The Thai government’s 30/30 policy targets 30% of domestic vehicle production being EV by 2030. To attract manufacturing investment, Thailand offered a package of incentives — import duty reductions, subsidies of THB 70,000–150,000 per vehicle for qualifying domestic EV purchases, and corporate tax incentives for manufacturers. BYD responded with the Rayong factory (150,000 units/year, operational 2025). SAIC Motor (maker of MG branded vehicles) already had Thailand manufacturing presence and is expanding EV production. Great Wall Motor (GWM, Haval brand) built a factory in Rayong. Toyota is building hybrid and BEV production locally as a defensive response.

Thailand already has approximately 90,000 registered EVs (end 2024), up from 3,000 in 2021. Market share for Chinese EV brands in new EV sales: approximately 75–80% in 2024. This market has already changed.

Indonesia is more complex. Indonesia has the world’s largest nickel reserves — a critical battery material — and is leveraging this into a deliberate battery supply chain strategy. The government requires 40% local content for EV subsidies to apply, which is designed to force manufacturers to source Indonesian materials and build local battery supply chains rather than simply importing Chinese-made EVs. This creates friction for pure-import Chinese EV plays.

Wuling Motors (Chinese) has been present in Indonesia longest and has built the most local supply chain integration. BYD is entering through dealer partnerships. Hyundai opened the first EV manufacturing facility in Indonesia (in partnership with LG for batteries) in 2022. The Indonesian market is a three-way contest: China (Wuling, BYD), Korea (Hyundai), and domestic production ambitions centred on the NiKel Maju battery supply chain vision.

Vietnam is the VinFast story. VinFast — Vietnam’s domestic auto manufacturer, founded by Vingroup’s Pham Nhat Vuong — entered EV production in 2021 and listed on Nasdaq via SPAC in August 2023. VinFast produces EVs in Vietnam for the domestic market and has ambitions to export to the US and Europe. It faces the simultaneous challenge of competing with BYD in its home market while attempting to scale internationally. Current Vietnam EV market: VinFast and BYD together represent approximately 90%+ of the market. The VinFast vs BYD domestic competition will determine whether Vietnam develops an indigenous automotive industry or cedes to Chinese supply chain dominance.

China EV exports to Southeast Asia: US$5.8 billion in 2023, up approximately 3x from 2021 (China Passenger Car Association, CPCA data). The trajectory is steep.

Thailand’s EV registration growth: 3,000 units (2021) → 90,000+ units (2024). CAGR of approximately 210% per year over three years. This is adoption curve inflection, not linear growth.

Japanese displacement: Toyota, Honda, and Mitsubishi still sell approximately 80% of total passenger vehicles in Thailand and approximately 90% in Indonesia (ICE + hybrid combined). Their EV market share in Thailand new EV sales is under 10%. The Japanese have the installed base; the Chinese have the EV momentum. The 10-year question is whether installed base advantages (service networks, consumer trust, brand familiarity) can hold market share through an EV transition.

Inline math on BYD’s Thailand factory economics: 150,000 units/year at an average revenue per vehicle of US$30,000 = US$4.5B in annual revenue potential from one factory. Against investment of approximately US$500M in factory construction, the payback period on invested capital is approximately 3–4 years at 30% gross margins — faster than most automotive factory investments historically.

Here is the argument for Japanese automotive resilience in Southeast Asia, and it deserves serious engagement.

Charging infrastructure in Southeast Asia is genuinely inadequate outside of major city centres. Bangkok, Ho Chi Minh City, and Jakarta have emerging public charging networks — BYD dealerships include charging infrastructure, the government has mandated charging stations at highways and public buildings. But the average Thai or Indonesian town has zero public charging infrastructure.

For intercity driving — which is how Thais and Indonesians actually use their cars, not in European or Singaporean urban driving cycles — an EV with a 400km range and no available public charging outside major cities is a practical anxiety trigger. Toyota’s hybrids, which charge from regenerative braking with zero charging infrastructure requirement, solve the range anxiety problem without requiring charging infrastructure.

Toyota has publicly and privately stated that it believes hybrids will dominate Southeast Asia through the 2030s, with BEVs taking meaningful market share only in the 2030s as charging infrastructure matures. This is self-serving but not obviously wrong given current infrastructure reality.

Grid reliability is the constraint that the EV bull case in Indonesia and the Philippines must answer. Both countries have average electricity grid reliability below developed market standards — brownouts in provincial Indonesia are routine, and the Philippines’ Meralco grid faces demand spikes that result in load shedding. Charging an EV fleet reliably requires grid reliability that does not currently exist uniformly across these markets.

The auto market transition in Southeast Asia will be determined by three variables: charging infrastructure development speed, battery cost trajectory, and how quickly Japanese manufacturers can bring competitive BEV products to market at Chinese-competitive price points.

On infrastructure: Thailand is moving fastest, with explicit government targets and Chinese partnership involvement in charging network rollout. Indonesia is moving secondarily, focused on the battery supply chain rather than charging speed. Vietnam, Philippines, and Malaysia are earlier stages.

On battery cost: Bloomberg NEF projects EV price parity with comparable ICE vehicles (without subsidies) in most markets by 2027–2030. At that point, the financial rationale for buying ICE disappears — EVs become cheaper to buy, cheaper to fuel, and cheaper to maintain. The transition accelerates sharply at price parity.

On Japanese response: Toyota’s response has been hybrids (already competitive) + a BEV platform (bZ series) launching in 2025–2026. Honda has the e:NS2 and e:NP2 for Asia markets. Mitsubishi is partnering with Renault-Nissan on EV development. The Japanese have resources and brand equity. They are 3–5 years behind on BEV architecture, and 3–5 years in an exponential technology curve is significant.

The dealership network and charging network that Chinese manufacturers build in the next 5 years is the asset that will determine who owns the market in 2040. BYD opening in Thailand was not just about Thailand. It was about establishing the manufacturing and distribution infrastructure from which to contest every other Southeast Asian market.

The empire building has started. The map of who wins will be drawn at dealer signing ceremonies in provincial Thailand, in Jakarta shopping mall parking lot charging stations, and in Hanoi traffic lanes where the next generation of Vietnamese commuters decides what car to buy.

This article is published for editorial purposes. No affiliate relationship applies to this piece.