How developed-market buyers collect credible emissions data from Thai suppliers — factors, primary data, and what CBAM and CSRD actually demand.

Thai Manufacturing: Scope 3 Carbon Reporting

Emissions data has moved from a sustainability team's nice-to-have to a procurement requirement. If you buy from Thailand and report under CSRD, SEC-style climate rules, or supply a retailer with a Scope 3 target, your Thai factory is now part of your carbon inventory.

What is actually being asked

Requirement	Who it hits	Data needed
CSRD / ESRS E1	EU-based or EU-listed buyers	Scope 3 category 1 purchased goods
CBAM	EU importers of steel, aluminium, cement, fertiliser, hydrogen	Embedded emissions per tonne, verified
Retailer Scope 3 targets	Suppliers to major chains	Product-level footprint, year-on-year reduction
Customer tenders	Industrial OEM buyers	Factory energy intensity, renewable share

Spend-based versus primary data

Most first inventories use spend-based factors: spend multiplied by an emission factor. It is fast and defensible as a starting point, but it makes a Thai supplier look identical to a European one, so it cannot show improvement. Primary data — actual kWh, fuel, and output per factory — is what auditors and CBAM want.

A practical data request to a Thai factory

Ask for twelve months of:

Grid electricity consumption in kWh and the utility bills behind it.
On-site fuel use: diesel, LPG, biomass, by volume.
Any renewable generation, including rooftop solar output and PPA documents.
Production output in the same period, in units or tonnes.
Process emissions for regulated processes such as plating or heat treatment.

Thailand's grid factor sits meaningfully below several regional alternatives, and rooftop solar is common in industrial estates. That combination often makes a Thai origin competitive on carbon, not just cost — but only if you can prove it.

Verification

For CBAM goods, expect verification by an accredited body and a per-tonne embedded emissions figure per installation. For voluntary reporting, an internal review plus retained utility bills is usually accepted. Either way, keep the evidence in the same document pack as your compliance certificates.

Reduction levers that are actually available

Rooftop solar on the factory, contractually documented.
Switching boiler fuel to biomass where legally permitted.
Shipping by sea and consolidating FCL rather than air freight — usually the single largest lever in the whole chain.
Reducing scrap; every rejected part carries full embodied emissions.

Frequently Asked Questions

Can I start with estimated data?

Yes. Spend-based estimates are an accepted starting point, but move strategic suppliers to primary data before any target or CBAM obligation bites.

Does CBAM apply to all goods from Thailand?

No. It covers specific sectors such as iron and steel, aluminium, cement, fertilisers, hydrogen and electricity. Check your HS codes against the current annex.

Is sea freight really lower carbon than air?

Substantially, per tonne-kilometre. Avoiding expedited air shipments is usually the cheapest emissions reduction available to an importer.

Who should own supplier emissions data collection?

Procurement, with sustainability providing the method. Data requests that arrive from outside the commercial relationship are routinely ignored.