Thailand Rebuilt the Numbers Under Your Carbon Footprint — TGO’s New Emission Factors Bite on 1 October 2026

On 6 August 2026, MTEC and NSTDA put the Thailand National LCI Database online as a public website — 766 datasets, of which 563 are national-level, ISO-conformant and expert peer-reviewed, after two decades of quiet development. It is the most consequential Thai carbon-data event of the year, and almost nobody in the listed space has noticed.

The reason it matters is what sits on top of it. TGO’s replacement Carbon Footprint of Product (CFP) emission-factor file, published 6 July 2026, is built from that database re-run on Thailand’s 2022–24 grid mix. It becomes mandatory on 1 October 2026. And it is not a like-for-like refresh: the file shrank, some factors moved by more than 100%, and roughly 55 dyed-fabric factors were deleted outright.

If your numbers move because the factors moved rather than because your emissions moved, you have a restatement. And a restatement is judged not on the arithmetic but on how you explain it — in public, in English. That is where this stops being a technical footnote and starts costing points.

Thailand’s national LCI database just went public

The Thai National LCI Database is not new — it has been the substrate under Thai footprinting since 2006, maintained by TIIS (Technology and Informatics Institute for Sustainability) within MTEC/NSTDA, and every row of TGO’s CFP factor file cites it by name. What changed on 6 August is that it became publicly browsable at thainationallci.nstda.or.th.

For a disclosure team that matters in a specific way: the provenance of your emission factors is now checkable by anyone — a verifier, a rating analyst, an investor’s ESG desk. Provenance you could previously assert, you can now be held to. That is a net gain for firms with disciplined TGO-certified carbon accounting, and an exposure for firms that have been quietly running on generic global factors.

What becomes mandatory on 1 October

TGO’s new CFP file states its own commencement on page one, in a single line with no accompanying announcement notice and no transition clause:

The headline change is the grid. Thailand’s electricity factor was rebased from the 2016–18 generation mix to 2022–24, and it fell. Note the arithmetic: the CFP grid factor is exactly the CFO Scope 2 and Scope 3 figures added together, in both the old and new files — a useful internal check when you are reconciling two sets of numbers.

Two honest caveats, because they change who should care. First, CFP is a voluntary product certification, not a listed-company disclosure obligation — if you do not carry product labels, 1 October is not your deadline. Second, a factor falling 7% is a mild tailwind, not a compliance crisis. Nobody fails a verification because their number got smaller.

The CFO grid factor already moved — in January

The change that does touch your 56-1 One Report has already happened, and a surprising number of teams have not registered it. TGO announced the revised CFO grid factor on 26 November 2025; it took effect 1 January 2026, with permission to use the old factor only until 31 March 2026. That grace period expired four and a half months ago.

So any FY2026 organisational inventory should already be built on 0.4750 — and if your prior-year comparative still sits on 0.4999, your year-on-year Scope 2 movement contains a methodology change you have not disclosed. One further detail worth flagging to anyone buying renewables: TGO’s notice states the tabulated grid factors exclude renewable electricity backed by I-RECs. See our ESG regulatory tracker for the running list of live Thai deadlines.

Where the real disruption is: polymers, textiles, glass

Read past the electricity row and the picture inverts. The categories that dominate the file by count barely moved — truck transport is 188 of the 540 entries and changed by roughly 0.04%; fuels moved under 1.1%; several waste factors are identical to four decimal places. For a logistics or services footprint, the new database is functionally the old one.

The disruption is concentrated in materials, and it is violent in both directions:

kgCO₂e per kg. Eight further petrochemical factors are new to the file, including PET, PTA, phenol and bisphenol A.

Harder still: factors that no longer exist. The textile group fell from 79 entries to 24 — the dyed-fabric block covering CVC 70/30, TC 65/35 and cotton knits in light, medium and dark shades is simply gone. Glass fell from 23 entries to 7. If a certified product relied on a deleted factor, there is no drop-in replacement: you must source primary data or justify a substitute dataset. That is a materially harder problem than re-multiplying by 0.5562, and it is the conversation packaging, apparel and glass-intensive manufacturers should be having now, not in September.

A restatement is a disclosure problem, not a spreadsheet problem

Here is the part that decides whether this costs you anything. When a factor change moves your reported number, the number itself is not the disclosure — the explanation is. IFRS S2 expects you to say which measurement approach and inputs you used and to flag when they change. FTSE Russell does not ask: it reads what you publish, in public, and it reads it in อังกฤษ.

So consider what an analyst sees when your Scope 2 drops 5% year on year. If your English disclosure carries a clear note — factor rebased from the 2016–18 to the 2022–24 national grid mix, prior year restated, source TGO — that reads as methodological control, and control is what the governance and climate themes reward. If the note exists only in the Thai edition, or is rendered as a loose paraphrase, the analyst sees an unexplained movement in your emissions. That is not a neutral outcome; inconsistent data is scored as weak data.

This is the quiet cost of treating the English edition as a translation deliverable rather than a score-earning asset. Methodology notes are exactly the material that gets dropped, compressed or mistranslated first, because they read as boilerplate to anyone who is not scoring you on them. Our note on ESG translation risk covers how this shows up, and the clause-mapped bilingual One Report is how we stop it: every Thai clause and its English counterpart locked to the same terminology and the same numbers.

What to do before 1 October

One thing we will not tell you: that your existing certificates are now invalid. TGO has published no grandfathering rule and no restatement obligation for CFP, and the July 2022 file is still downloadable from its site. The natural reading is that 1 October binds submissions from that date forward, including renewals — but TGO has not said so in writing, and we are not going to assert it for you. If a certificate is close to renewal, put the question to the Low Carbon Business Certification Office in writing and keep the answer on file.

Emission factors are the least-scrutinised input in most inventories and the one that multiplies straight through every number you publish. Thailand has just replaced the whole set, made the underlying database public, and given nine months of notice. The companies that come out of this well will be the ones whose English disclosure explains the movement before anyone has to ask. See how TGO-certified carbon feeds your FTSE score → or start with your IFRS S1 & S2 bilingual readiness.

Sources: TGO Thai Carbon Label — Emission Factor CFP (6 July 2026, in force 1 October 2026) and Emission Factor CFO (Feb 2026); TGO Low Carbon Business Certification Office announcement on CFO grid electricity factors (26 November 2025); MTEC/NSTDA — Thailand National LCI Database launch (6 August 2026) and thainationallci.nstda.or.th. Factor values read directly from the TGO source files. Certification-round dates were not verifiable from a primary source and are deliberately not quoted here.