Carbon Criteria in Procurement: How to Score Supplier Emissions in Your RFPs

Picture a category manager closing a resin tender with three similarly priced suppliers. Supplier A sends a verified product carbon footprint (PCF). Supplier B sends its corporate Scope 1 and 2 total. Supplier C sends nothing. On most scorecards today, C loses nothing for its silence, and A may even look worse because its number is real and complete.

That is the problem this guide solves. Companies' supply chain emissions were 26 times greater than their emissions from direct operations, according to a CDP and BCG analysis of 2023 data disclosed through CDP. Whoever signs the purchase order controls most of that footprint. Procurement is where Scope 3 targets either become real or stay on slides.

Why should procurement own carbon criteria in supplier selection?

Sourcing decisions lock in emissions for the length of a contract, and sustainability teams cannot renegotiate them afterwards. If carbon is not in the scorecard at award time, it will not be in the contract.

Supply chain leaders are reaching the same conclusion. At CDP's Supply Chain roundtable during New York Climate Week 2026, which CO2 AI attended, participants agreed that supplier emissions data has to inform decisions on supplier engagement, sourcing and product choices, not just feed the annual report. Data that never reaches an award decision is a reporting cost, not a lever.

Procurement also holds the levers that make suppliers respond. Participants pointed to three that work:

• Requirements built into the relationship. Supplier codes, contract addenda and business reviews. Buyers who used these reported high supplier response rates, with suppliers now expecting the annual request and preparing their data early.
• Positive incentives. Recognition, improved contract or payment terms and peer benchmarking can move suppliers as much as requirements do.
• One answer for many customers. Participation rises when suppliers can respond to several customers through a single submission, so align your request with formats suppliers already use rather than inventing your own.

The gap participants flagged sits inside the buying organisation: procurement and category teams often lack the confidence, the language or the internal incentives to raise carbon with suppliers. A scored criterion with clear, published rules fixes that. It turns "please send us your footprint" into a standard part of every tender, with the same weight in the negotiation as price, quality and delivery.

What supplier emissions data should procurement require in tenders?

Ask for the most specific data the supplier can credibly provide, and accept less specific data with a clear path to improve. The GHG Protocol lists four methods for Category 1 purchased goods and services, ordered by how specific they are to the supplier: supplier-specific, hybrid, average-data and spend-based.

Translate that hierarchy into four data maturity tiers your RFP can name explicitly:

• Tier 0. Spend-based estimate. What the supplier provides: Nothing; you estimate from spend and sector averages; GHG Protocol equivalent: Spend-based method; What it tells you: Category average, not this supplier; Suggested data-quality score: 0 of 3.
• Tier 1. Corporate footprint. What the supplier provides: Scope 1, 2 (and ideally 3) totals, allocated to your volumes; GHG Protocol equivalent: Closest to the hybrid method; What it tells you: Supplier's overall intensity, not your product; Suggested data-quality score: 1 of 3.
• Tier 2. Product-level PCF. What the supplier provides: Cradle-to-gate PCF calculated per the PACT Methodology; GHG Protocol equivalent: Supplier-specific method; What it tells you: Emissions of the product you actually buy; Suggested data-quality score: 2 of 3.
• Tier 3. Verified PCF. What the supplier provides: Tier 2 plus third-party verification; GHG Protocol equivalent: Supplier-specific method, assured; What it tells you: Same, with audit trail; Suggested data-quality score: 3 of 3.

Two cautions. First, the GHG Protocol itself warns that data collected from a supplier may be less accurate than industry-average data for a particular product, so tier is a proxy for quality, not proof. Second, check which PACT version a PCF follows. PACT launched Version 3 on 30 April 2025, with a five-level data quality rating and a verification approach that moves from calculation model verification to PCF Program verification from 2030.

A common question from carbon accounting teams: how do you even start when the procurement file has tens of thousands of lines and most suppliers have no data? Start at Tier 0 for the whole file, rank suppliers by estimated emissions, and only ask the top of the list for Tier 1 or 2 data. The real cost of supplier data collection sits in chasing the long tail, so do not start there.

What weight should carbon have in an RFP scorecard?

There is no standard number; the right weight depends on how much carbon differs between credible suppliers in the category. Choose one of three models and apply it consistently.

1. Gate. A pass or fail threshold, such as "a corporate footprint and a reduction target are required to bid". Simple, defensible, and good for categories where data maturity is low.
2. Weighted criterion. Carbon becomes a scored line next to cost, quality and delivery. Starting with a modest share and raising it as data matures limits the risk of awarding contracts on weak numbers. Treat any figure as an assumption to back-test on past tenders, not a benchmark.
3. Shadow carbon price. Convert each bid's estimated tonnes into money with your internal carbon price and add it to the total cost of ownership. This puts carbon in the currency procurement already uses, and works best in carbon-intensive categories such as steel, aluminium, chemicals and polymers.

Whatever you choose, split the carbon score into two sub-scores: data quality (the tier list above) and carbon performance (intensity per functional unit plus a credible reduction trajectory). Mixing them is what punishes honest suppliers.

How do you avoid penalising suppliers who disclose honestly?

Never let "no data" score better than "real data". The fix is a conservative default: when a supplier provides nothing, assign the Tier 0 spend-based estimate with a penalty uplift, so a disclosed number below that default always wins.

Four rules that keep the scorecard fair:

• Compare like with like. Score PCFs against PCFs for the same functional unit and system boundary. A corporate intensity and a cradle-to-gate PCF are different measurements.
• Reward the trajectory. Give points for a validated science-based target or a dated reduction plan, not only for today's number.
• Reward data improvement. Moving from Tier 1 to Tier 2 during the contract should earn credit at the next review.
• Stay proportionate with smaller suppliers. Under the revised ESRS framework, from financial years beginning on or after 1 January 2027, companies cannot require value chain undertakings with 1,000 employees or fewer to provide information beyond a short list of datapoints in Commission Delegated Regulation (EU) 2026/1560, when the request serves your own CSRD reporting. Ask your legal team how this applies to tender data requirements before you make Tier 2 mandatory for small suppliers.

How do carbon criteria connect to CSRD and SBTi supplier targets?

They are the same data used twice: once to choose suppliers, once to report and track targets. Building the scorecard on reporting-grade data saves you from collecting it again.

On reporting, the revised ESRS, Commission Delegated Regulation (EU) 2026/1563, were published in the Official Journal on 21 September 2026 and apply to financial years beginning on or after 1 January 2027. Your ESRS E1 Scope 3 figures improve every time a tender moves a supplier from Tier 0 to Tier 2.

On targets, the SBTi Corporate Near-Term Criteria V5.3.1 allow supplier engagement targets, which must be fulfilled within a maximum of five years of target submission, with suppliers setting science-based targets. The Corporate Net-Zero Standard V2.0, which takes effect from 1 February 2027, goes further, allowing targets to increase the share of tier 1 suppliers (based on emissions or spend) that are in transition or net-zero aligned. That is a metric only procurement can move, one award at a time.

Public buyers face an extra layer: Regulation (EU) 2024/1735 (Net-Zero Industry Act) introduces mandatory non-price criteria in public procurement of clean technologies, and Regulation (EU) 2024/1781 (Ecodesign for Sustainable Products Regulation) empowers the Commission to set mandatory green public procurement requirements through implementing acts. Suppliers will meet similar questions from public and private buyers alike.

Which contract clauses make carbon criteria stick?

• Data provision: an annual PCF or corporate footprint for contracted products, in a PACT-aligned format.
• Method change notice: the supplier flags any change in methodology, emission factors or boundaries, so year-on-year comparisons stay valid.
• Reduction trajectory: an agreed intensity pathway with review points.
• Verification rights: the right to request third-party verification or evidence for Tier 3 claims.
• Data use and confidentiality: what you may do with supplier data, and what you will not share.
• Incentives: volume, duration or price mechanisms that reward suppliers who beat the pathway.

How do you run a primary-data-first requirement at scale?

You need a supplier engagement platform as requesting and comparing PCFs across hundreds of suppliers breaks email workflows quickly.

The CO2 AI Supplier Engagement Hub helps procurement and sustainability teams request corporate footprints and PCFs from suppliers, review what comes back and feed accepted data into the Scope 3 inventory. Suppliers can join the free Product Ecosystem to share their carbon data with customers. For a CPG view of the commercial stakes, read why your carbon data determines your contracts.