Thailand auto parts makers face EV transition as carbon rules reshape supplier competitiveness

Thai auto parts suppliers face rising pressure to retool for EV production while investing in renewable electricity, energy efficiency and carbon management. (Photo: iStock)

Thailand’s auto parts industry is facing a transition that is both technological and environmental, with each pressure reshaping what it means to remain competitive as a supplier.

The technological shift is already visible in the customer base. The Japanese OEMs that anchored Thailand’s auto supply chain for decades are reducing capacity, while Chinese EV manufacturers are building local production under the EV3 and EV3.5 incentive schemes.

At the same time, automakers are pushing greenhouse gas disclosure and reduction requirements deeper into their supplier networks, and the EU’s Carbon Border Adjustment Mechanism (CBAM) is beginning to raise the cost of carbon-intensive materials such as steel and aluminum.

For Thai suppliers, these pressures are arriving together. Retooling for EV components requires new equipment, production processes and technical capabilities, while decarbonization requires investment in renewable electricity, energy efficiency, carbon accounting and supplier engagement. Both demands are emerging as vehicle production slows and margins come under pressure.

“The automotive industry is entering a new phase where competitiveness is increasingly shaped by sustainability,” Sutheep Ratnabhas, President, Asia at Maxion Wheels and Vice President of the Electric Vehicle Association of Thailand (EVAT), said in written responses to RECCESSARY. He said quality, cost and delivery remain fundamental, but OEMs are increasingly evaluating manufacturers' energy sourcing and emissions reduction efforts alongside traditional supplier metrics.

Unlock the full article to explore three key takeaways:

1. Thailand’s major listed auto parts suppliers are cutting emissions, but renewable electricity access remains limited.
2. Maxion Wheels highlights the procurement gap: one of its Thailand plants reaches about 25% renewable electricity through 4.66 MW of on-site solar, while its three India plants reach 40–55% through off-site solar parks and wind procurement.
3. CBAM’s paid phase began in January 2026, and a proposed 2028 expansion could cover auto components including wheels, gearboxes and certain engines, giving Thai exporters a two-year window to cut embedded carbon in both power and materials.