Scope 3 Category 1 Explained: Purchased Goods, Services and the Supplier Data Gate
Category 1, purchased goods and services, is usually the largest slice of a company's Scope 3 footprint and the one a buyer can only cut through its supply chain. That is why suppliers to majors like Shell are now asked for primary carbon data, and why a credible Scope 3 number has quietly become a condition of winning B2B contracts.
- Scope 3 Category 1, purchased goods and services, is the cradle-to-gate emissions of everything a company buys, and under the GHG Protocol it is the first and usually the largest of the fifteen Scope 3 categories.
- For manufacturers, Category 1 alone can exceed 60 percent of total emissions, and across sectors Scope 3 is typically 70 to 95 percent of a company's footprint, so a buyer cannot hit its targets without its suppliers.
- CDP reports that corporate supply chain emissions are on average about 26 times higher than a company's own operational emissions, which is why large buyers push carbon accounting down into their supply base.
- The buyer can only influence Category 1 through procurement, so reducing it means moving from spend-based estimates to supplier-specific primary data, and asking vendors for that data directly.
- For B2B suppliers the practical effect is a qualification gate: credible Scope 3 data is becoming a condition of being shortlisted, and a supplier that cannot answer the carbon question is easy to screen out.
The first, and usually the biggest, of fifteen categories
Under the GHG Protocol Corporate Value Chain (Scope 3) Standard, a company's indirect value-chain emissions are split into fifteen categories. Category 1, purchased goods and services, captures the upstream, cradle-to-gate emissions from the production of everything the company buys in a reporting year, up to the point of receipt, excluding anything already counted in categories 2 through 8.
In plain terms, it is the carbon embedded in the goods and services on a company's purchase ledger: the steel, cement, chemicals, equipment, logistics inputs, software and professional services it acquires. For most buyers it is the single largest Scope 3 category, and for manufacturers it alone can account for more than 60 percent of total emissions. That scale is exactly why it is the category procurement teams are told to attack first.
Purchased goods and services
All upstream emissions from producing the goods and services a company buys, from raw materials to outsourced services.
Cradle-to-gate boundary
Counts emissions across the product life cycle up to the point of receipt, excluding the buyer's own operations.
Usually the largest slice
For manufacturers Category 1 can exceed 60 percent of total emissions, making it the priority target.
Project 54Category 1 sits in the supply chain, so the buyer can only reach it through procurement.The only lever a buyer has is procurement
Scopes 1 and 2 are the emissions a company controls directly, its own fuel and its purchased electricity. Category 1 is different: the emissions physically happen inside the supplier's operations, not the buyer's. A buyer cannot retrofit a supplier's factory or switch its power contract. The only lever it has is the purchasing relationship, which is why the pressure travels down the chain to the people who can actually change the number.
The GHG Protocol allows four ways to calculate Category 1: supplier-specific, hybrid, average-data and spend-based. Spend-based and average-data methods use industry averages and need nothing from the supplier, but they are blunt and cannot show real reductions. Supplier-specific and hybrid methods require primary data collected from the supplier. As buyers move from spend-based estimates toward supplier-specific data, the request for a real carbon number lands squarely on the vendor's desk.
Not directly controllable
Category 1 emissions occur in the supplier's operations, so the buyer can only act through procurement.
Spend-based is blunt
Average and spend-based methods need no supplier input but cannot demonstrate genuine reductions.
Primary data shifts the ask
Supplier-specific and hybrid methods require primary data, so the buyer must ask the supplier for it.
Questionnaires, platforms and a widening data gate
Buyers acquire supplier carbon data through a stack of mechanisms: supplier codes and principles that set expectations, procurement questionnaires and platforms such as CDP Supply Chain and EcoVadis, and, for the largest emitters, direct decarbonisation roadmaps. Shell, for example, uses its Supplier Principles and supply-chain engagement to ask suppliers for primary carbon data, set ambitions and share performance, and had signed non-binding memoranda with several of its largest supply-chain emitters.
The data gate is still opening. CDP has found that only about 13 percent of businesses include climate-related requirements in supplier contracts and fewer than 6 percent require suppliers to disclose climate data, so the practice is far from universal. But it is tightening fast, and it works: suppliers were 52 percent more likely to cut their emissions when buyers offered financial incentives rather than training alone. For a vendor, the signal is simple: the questionnaires are getting harder, and being ready is becoming a differentiator.
Codes and questionnaires
Supplier principles, CDP Supply Chain and EcoVadis are the standard channels for requesting carbon data.
A 26x multiplier
CDP finds supply-chain emissions average about 26 times a company's operational emissions, so buyers must engage suppliers.
Still early, moving fast
Only about 13 percent of firms put climate terms in contracts today, but incentives make supplier reductions 52 percent more likely.
Carbon data is turning into B2B currency
Regulation is hardening the ask. Under the EU's CSRD and the ESRS E1 climate standard, in-scope companies must disclose how much of their Scope 3 is based on primary versus secondary data, which pushes buyers to collect real supplier figures rather than estimates. Science-based targets add to it: a company with an approved SBTi target for Scope 3 typically commits to a share of suppliers setting their own targets, turning a buyer's climate goal into a procurement requirement.
The result is that supplier carbon data has quietly become a commercial qualification, not a compliance footnote. When a major scores and shortlists vendors, a credible, primary Scope 3 number increasingly sits alongside price, quality and delivery as a gating criterion. Suppliers who can answer the carbon question keep their place on the tender list; those who cannot are the easiest line to cut. Carbon data, in effect, is becoming a form of B2B currency.
CSRD and ESRS E1
In-scope companies must report the primary-versus-secondary split of Scope 3, pushing buyers to collect real data.
Science-based targets
Approved SBTi Scope 3 targets usually require a share of suppliers to set their own targets.
A gating criterion
Credible supplier carbon data now sits alongside price, quality and delivery on the tender scorecard.
Turn the carbon question into a commercial asset
The defensive move is to be ready: produce a defensible Scope 1 and 2 number, start on your own Category 1, and be able to complete a CDP or EcoVadis questionnaire without scrambling. The methods matter less than having a credible, documented figure and a direction of travel; buyers are looking for competence and momentum, not perfection.
The offensive move is to make it a selling point. A supplier that can hand a buyer clean primary data, a reduction trajectory and a clear story removes friction from the buyer's own reporting and makes itself the low-risk choice. That is the Project 54 view: for energy and industrial vendors, carbon data is no longer a cost of compliance but a piece of commercial positioning, and the suppliers who treat it that way win the contracts that data-blind competitors lose.
Get a defensible number
A documented Scope 1 and 2 figure and a start on Category 1 beats a perfect but late one.
Answer the questionnaire
Be able to complete CDP or EcoVadis on request; readiness itself is a differentiator.
Make it a sales asset
Clean primary data and a reduction story make you the low-risk vendor on the shortlist.
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Where does your business sit on supplier carbon data today?
Frequently asked
The GHG Protocol splits Scope 3 into fifteen categories, eight upstream and seven downstream. Category 1 is purchased goods and services; others include capital goods (2), fuel and energy activities (3), transport, waste, business travel, commuting, use of sold products and end-of-life treatment. Category 1 is usually the largest for buyers.
Yes. Category 1 is the GHG Protocol's label for purchased goods and services: the upstream, cradle-to-gate emissions embedded in everything a company buys, up to the point of receipt.
Category 1 covers goods and services consumed in the reporting year, while Category 2 covers capital goods, the long-lived assets such as machinery, buildings and vehicles a company purchases. Both are upstream, but they are reported separately.
Not by default, but they are increasingly asked to provide primary emissions data so their buyer can calculate Category 1 accurately. See how that plays out in Shell's Scope 3 and sustainable procurement and what a sustainable procurement application actually asks for.
Spend-based methods estimate emissions from how much money is spent, using industry averages, and need no supplier input. Supplier-specific methods use primary data from the supplier itself, and are more accurate. The shift toward supplier-specific data is why buyers now ask vendors for real carbon numbers.
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