Your UK Customer Asked for Emissions Data – Here's How to Respond
Customer Emissions Data Requests
A customer is asking for emissions data — here's exactly what to send
Most UK suppliers still respond to these requests with a mix of old bills, guesswork and a rushed email. GreenKPO turns the same request into a structured, evidenced emissions submission your customer can actually use — usually within one working week.
What is your customer actually asking for?
When a customer asks for emissions data, they're almost always working to their own reporting cycle — completing a Scope 3 inventory, running a supplier assessment, or preparing for mandatory climate disclosures. They need your figures to plug a gap in their own calculations, so the request is rarely as open-ended as it first looks.
Usually mandatory: the reporting period, which scopes are included (most often Scope 1 and 2), your total emissions in tCO2e, and the organisational boundary. Usually optional but strengthens your response: relevant Scope 3 categories, a data quality statement, and third-party verification.
Immediate checklist: what to gather before you reply
Before drafting anything, pull together the following. Having this in hand first means you write the response once, rather than going back and forth with your customer.
- Reporting period — confirm whether it's financial year, calendar year, or a custom period the customer has specified
- Scopes required — clarify with the customer if it's not stated; don't assume Scope 3 is wanted unless asked
- Source data — energy bills, fuel receipts, mileage logs and travel records for the period
- Emission factors — the current UK Government GHG Conversion Factors for the relevant year
- Calculation records — the spreadsheets or workings behind each total, kept for your audit trail
- Data quality notes — any gaps, estimates or assumptions made, stated clearly rather than hidden
Step-by-step: putting together your response
- 1. Clarify the request. Confirm reporting period, scopes and format directly with the customer if any of it is unclear — this prevents rework later.
- 2. Collect your source data. Gather energy bills, fuel receipts and mileage or travel records covering the full reporting period.
- 3. Apply current UK conversion factors. Use the correct year's Government GHG Conversion Factors and note which version you used.
- 4. Calculate and total by scope. Keep Scope 1 and Scope 2 separate, and label any Scope 3 figures as estimates if included.
- 5. Quality-check your figures. Look for data gaps or anomalies, and check totals against the previous period where possible.
- 6. Add context. Note any significant changes from previous periods and mention reduction initiatives already under way.
- 7. Send it promptly. Aim to respond within two weeks; if you need longer, say so early and share interim figures if you have them.
Common mistakes to avoid
- Guessing the reporting period — sending data on your own financial year when the customer needs calendar year figures causes rework for both sides.
- Assuming Scope 3 is wanted — most customers only need Scope 1 and 2; calculating Scope 3 unprompted wastes time and can delay your response.
- Hiding data gaps — undisclosed estimates or missing periods undermine trust more than a clearly labelled limitation would.
- Using outdated conversion factors — UK Government factors update annually; using the wrong year's version is an easy error to catch and an easy one to avoid.
- Sending figures with no audit trail — a total with no calculation record behind it can't be defended if the customer or their assurance provider asks a follow-up question.
How GreenKPO removes the manual work
Most of the effort in answering an emissions data request goes into finding the right bills, applying the correct year's conversion factors, and building a response your customer won't send back with questions. GreenKPO pulls in your utility and fuel data, applies up-to-date UK Government emission factors, and generates a submission-ready breakdown by scope — with the underlying calculations and source records attached, so you can point to evidence if anyone asks. It doesn't replace your judgement on boundary or methodology decisions; it removes the spreadsheet work behind them, so a request like this takes days rather than weeks.
Common questions
- What if I don't have complete data for the reporting period?
Communicate any data gaps transparently and use reasonable estimation methods where necessary. Document your assumptions and calculation approach clearly — most UK customers accept estimated data provided the methodology is sound and limitations are disclosed. - Should I include employee commuting in my emissions data?
Employee commuting is a Scope 3 emission that most customers won't require unless they've specifically asked for comprehensive value chain data. Focus on Scope 1 and 2 unless directed otherwise. - How often will customers request updated emissions data?
Most UK organisations update their carbon data annually, so expect annual requests from established customers. Establishing a routine reporting process makes each subsequent request much faster to answer. - Do I need third-party verification of my figures?
Not always, but some UK customers preparing assured sustainability reports will explicitly require it. Independent verification adds credibility and is worth considering for significant customer relationships. - How quickly should I respond?
Aim for within two weeks where possible, since customers are often working to their own reporting deadlines. If you need longer, say so early and share interim figures if you have them.
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Prepare the emissions data your customer requested
Get your reporting period, scope breakdown, calculations and supporting evidence pulled together — without building a spreadsheet from scratch. Typical turnaround is 5-10 working days.