Supplier analytics: from Scope 3 estimates to supplier data
For most companies, Scope 3 emissions are the largest part of the footprint and the least precise. Supplier analytics is how you change that: knowing which suppliers matter, what data they can give you, and how to turn spend-based Scope 3 estimates into supplier-specific figures you can stand behind.
Three ways to calculate purchased goods emissions
The GHG Protocol Scope 3 Standard describes several methods for Category 1 (purchased goods and services). In practice, most companies use a mix of three:
- Spend-based: money spent × an emission factor per unit of currency for that sector. Quick and complete, but it cannot reflect a supplier's own efficiency or energy mix.
- Average-data: physical quantity bought (tonnes of steel, litres of paint) × an industry-average factor. Better, but still generic.
- Supplier-specific: the supplier's own emissions allocated to what you buy, or a verified product footprint. The most accurate, and the only method that rewards suppliers who decarbonise.
The aim is not to replace everything at once. It is to move the right suppliers from the first method to the last, year by year.
Start with a Pareto view
Supplier lists run to hundreds or thousands of names, but emissions are rarely spread evenly. Rank suppliers by estimated emissions — not just spend — and you will usually find a small group responsible for most of Category 1. Those are the suppliers worth engaging first.
Ranking by emissions matters because spend and carbon do not move together. A modest steel or chemicals bill can carry far more emissions than a large software contract. A good analytics view shows both, side by side, and lets you filter by category, site and country.
Score suppliers on climate readiness
Once you know who matters, you need to know who is ready. A climate score combines a few observable signals:
- Do they measure and disclose Scope 1 and 2 emissions?
- Do they have a reduction target, and is it validated by the Science Based Targets initiative (SBTi)?
- Do they respond to CDP, and with what score?
- Can they provide product-level footprints or an EPD?
- How good is the data they actually sent you?
A score turns a long list into clear groups: suppliers to partner with, suppliers to nudge, and suppliers where an estimate will do for now. Weighting SBTi and CDP coverage by emissions — not by headcount of suppliers — tells you how much of your Scope 3 already sits with companies committed to reduce.
Run engagement like a funnel
Supplier engagement fails when it is a one-off e-mail with a spreadsheet attached. Treat it as a funnel and measure each step:
- Invited — suppliers added by hand or from a list.
- Signed in — they reached the supplier portal.
- Reported — they submitted emissions, targets or product data.
- Accepted — you reviewed the submission and it became a supplier factor.
Tracking drop-off at each stage shows where to act: a reminder for those who never signed in, a call for those who started but stalled, a data-quality conversation for those whose numbers did not pass review.
Track trajectories, not just snapshots
One year of supplier data tells you where a supplier stands. Several years tell you where it is heading. Plot each key supplier's emissions or intensity against its own target, and against the reduction your own target needs from the value chain. Suppliers ahead of the line are candidates for preferred status; those falling behind are candidates for a conversation, joint projects or, eventually, alternative sourcing.
Trajectories also help procurement. When a sourcing decision is close on price and quality, a supplier's verified emissions and credible target can tip the balance — and supplier analytics makes that information available at the moment the decision is made, not months later in a sustainability report.
Review before it counts
Supplier data is only valuable if it is credible. Before a supplier's figure replaces a spend-based estimate in your inventory, someone should check it: is the boundary right, is the allocation sensible, does it match last year's trajectory? In EKOTRACE, supplier submissions go through the same Entries & approvals flow as internal data, and only accepted figures become supplier factors. The evidence and review trail stay attached for your verifier.
How EKOTRACE supports supplier analytics
Under Value chain › Suppliers, EKOTRACE brings this together. Suppliers sign in to a portal with an e-mail and access code — no licence needed — and report once. You see the engagement funnel, climate scores, emissions-weighted SBTi and CDP coverage and each supplier's own trajectory. A published supplier product footprint from Product LCA can become that supplier's purchase factor automatically. See the Supplier Engagement page, or how this feeds your full Scope 1, 2 and 3 inventory.
Frequently asked questions
How many suppliers should we engage in year one?
Start with the group that covers most of your Category 1 emissions — often a few dozen — rather than everyone.
Do suppliers need to buy software?
Not with a supplier portal. They report through a secure link to your workspace and see only their own data.
Can we mix methods in one inventory?
Yes. The GHG Protocol expects a mix; what matters is disclosing which method covers what share.