Customer Asked for Scope 3 Data? What UK Suppliers Should Send
Scope 3 Supplier Data Requests
Whether it arrived as a CDP Supply Chain survey, an EcoVadis form, or a plain email from procurement, your customer needs the same thing: structured emissions data for their Scope 3 Category 1 or 2 calculations. GreenKPO turns your activity data into a submission-ready response, usually within one working week.
What is your customer actually asking for?
A Scope 3 data request from a large customer is usually tied to their supply-chain emissions calculation, most commonly falling under "Category 1: Purchased Goods and Services" or "Category 2: Capital Goods." Which category actually applies depends on what you supply — goods, services, equipment or capital assets — so check the request rather than assuming. They need the emissions tied to what you supply them — not your entire company footprint, though some requests ask for both.
Usually mandatory: the carbon footprint of what you deliver to them (often as kg CO2e per unit or per £ spent), and a clear statement of your methodology. Usually optional but strengthens your response: your company-wide carbon intensity metrics, and evidence of reduction targets or initiatives. Some customers accept spend-based estimates; others expect product-specific, primary-data calculations — check which before you start.
Immediate checklist: what to gather before you reply
Most UK SMEs already have this scattered across finance, facilities and operations. Pull it together before drafting a response.
- Energy data — electricity and gas consumption at the facilities used to deliver this customer's goods or services
- Fuel and vehicle data — company vehicle or equipment fuel use relevant to this relationship
- Freight and logistics data — distances and modes used to deliver products to your customer
- Business travel records — employee travel connected to servicing the account, if relevant
- Emission factors — the current year's UK Government GHG conversion factors
- Reduction initiatives — any targets, completed projects or action plans worth including
Step-by-step: putting together your response
- 1. Read the request format carefully. Note whether it's a CDP survey, EcoVadis assessment, or a bespoke customer portal — each expects a slightly different structure.
- 2. Clarify the level of detail expected. Ask your procurement contact whether spend-based estimates are acceptable or whether they need product-specific primary data.
- 3. Collect your activity data. Gather energy, fuel, freight and travel records covering the relevant reporting period.
- 4. Apply UK Government conversion factors. Convert each activity into CO2e using the current year's published factors.
- 5. Structure your response. State your reporting boundary, present figures in the requested units, and explain any estimates or assumptions clearly.
- 6. Add your reduction story. Include any targets, completed initiatives or action plans — this often matters as much as the raw figure.
- 7. Submit ahead of deadline. Most requests give 2-6 weeks; if you need longer, contact your customer early rather than missing the date silently.
Common mistakes to avoid
- Guessing what level of detail is wanted — over-investing in detail your customer didn't ask for wastes time; under-delivering risks a rejected submission. Ask first.
- Ignoring the request entirely — a missed or unanswered Scope 3 request can affect contract renewals and preferred-supplier status.
- Reporting your whole company footprint when only relationship-specific data was needed — check exactly which category and boundary the request is targeting.
- Presenting estimates without labelling them — industry-average or spend-based figures are usually fine for a first response, but say so clearly.
- Skipping the methodology statement — a number with no boundary or calculation approach attached is hard for a customer's platform (CDP, EcoVadis) to score.
How GreenKPO removes the manual work
Most of the effort in answering a Scope 3 request goes into finding the right activity data, applying the correct UK conversion factors, and structuring the output the way CDP, EcoVadis or a customer portal expects. GreenKPO pulls in your energy, fuel and freight data, applies up-to-date UK Government emission factors, and generates a submission-ready breakdown with the methodology and source records attached — so you're not decoding technical guidance from scratch each time a new customer asks. It doesn't replace your judgement on boundary or scope decisions; it removes the calculation and formatting work behind them, so a first-time response takes days rather than weeks.
Common questions
- How quickly do I need to respond?
Deadlines typically range from 2-6 weeks. Check your request for the specific date, and contact your customer early if you need an extension — early engagement is viewed far better than silence. - What if I don't have detailed emissions data available?
Most customers accept reasonable estimates for initial responses, especially from smaller suppliers. Apply UK Government conversion factors to what you do have — energy bills, fuel receipts — and label which figures are estimated. - Do I need third-party verification?
Not usually for smaller suppliers, though some sectors or high-value relationships may require it. Check your specific request or ask your customer contact what level of assurance they expect. - Can I use industry average data instead of my actual emissions?
Yes, industry averages or spend-based estimates are often an acceptable starting point, particularly for your first response. State clearly that you've used averages, and consider building measurement capability for future cycles. - Will this be expensive to prepare?
Costs vary with business complexity, but most UK SMEs can complete an initial response with modest effort. The process often surfaces efficiency opportunities that offset the time invested.
Prepare your supplier emissions response today
Get your activity data collected, calculated with UK conversion factors, and structured into a submission your customer's platform can score — without weeks of decoding technical guidance.