Customer asking for carbon footprint
Customer Carbon Footprint Requests
You likely already have most of the data needed — energy bills, fuel receipts, mileage logs. The challenge is knowing which data to use, scoping it correctly, and presenting it in a format your customer's procurement or sustainability team can actually accept. GreenKPO turns that same data into a GHG Protocol-aligned report, usually within one working week.
What is your customer actually asking for?
When a customer asks for a carbon footprint, they're usually working to their own reporting framework — compiling Scope 3 data for their climate disclosures, or assessing you against ESG or supplier sustainability criteria. Getting the boundary right matters: too narrow and you miss their requirement, too wide and you create reporting burden or expose commercially sensitive detail you didn't need to share.
Usually mandatory: your Scope 1 and 2 emissions, the organisational boundary (which entities and sites are included), and the reporting period. Usually optional but strengthens your response: specific Scope 3 categories tied to your relationship with the customer, normalised metrics, and a data quality statement.
Immediate checklist: what to gather before you reply
Most of this already exists in your finance and facilities records — you're pulling it together, not starting from zero.
- Organisational boundary — which legal entities, sites and operations are included
- Reporting period — the temporal boundary your calculation covers
- Energy data — utility bills with meter readings and consumption volumes for electricity and gas
- Transport data — fuel receipts, mileage logs and business travel records
- Refrigerant records — maintenance logs and top-up certificates, if relevant to your operations
- Emission factors — current UK Government GHG Conversion Factors for the relevant year
Step-by-step: putting together your response
- 1. Confirm the boundary your customer needs. Ask directly rather than assuming — some want Scope 1 and 2 only, others need specific Scope 3 categories tied to your relationship.
- 2. Gather your source data. Pull energy bills, fuel receipts, mileage logs and refrigerant records for the defined reporting period.
- 3. Apply UK Government emission factors. Convert each activity into tCO2e using the current year's published conversion factors.
- 4. Total by scope and source category. Keep Scope 1 and 2 separate, and break down each by source where possible.
- 5. Add normalised metrics. Emissions per employee, per square metre, or per unit of revenue give your customer a comparable figure.
- 6. Document your methodology. Note your boundary, the factors and sources used, and any estimation methods applied.
- 7. Present it professionally. Open with an executive summary — total figure, period and scope — then the detailed breakdown.
Common mistakes to avoid
- Scoping too narrow or too wide — under-reporting misses the requirement; over-reporting can expose commercially sensitive detail or create reporting burden for future years.
- Skipping the boundary statement — a total with no stated organisational or temporal boundary is hard for a customer to use in their own calculations.
- Relying on estimates without saying so — customers expect figures based on actual consumption data; undisclosed estimates undermine confidence if queried.
- Losing the source documents — every data point in your calculation should trace back to a verifiable bill, receipt or record.
- Sending a number with no context — no normalised metric and no methodology note makes the figure hard to compare or trust.
How GreenKPO removes the manual work
Most of the effort in producing a customer-ready carbon footprint goes into finding the right source documents, applying the correct emission factors, and structuring the output the way GHG Protocol reporting expects. GreenKPO pulls in your energy, fuel and travel data, applies up-to-date UK Government emission factors, and generates a scoped, evidenced report with the underlying calculations attached — so you can hand it to a customer or auditor without reassembling it from spreadsheets. It doesn't set your boundary or methodology decisions for you; it removes the calculation and evidence-gathering work behind them, so a request like this takes days rather than weeks.
Common questions
- Do I need to include Scope 3 emissions?
Only if your customer specifically asks for it. Focusing on Scope 1 and 2 gives a robust baseline for most supplier carbon footprint requests, since these scopes are within your direct control and easier to measure accurately. - What if some of my data is estimated rather than measured?
That's fine as long as you say so. Note what percentage of your figure is based on primary versus estimated data — transparency builds more confidence than presenting estimates as definitive. - Which standard should my calculation follow?
The GHG Protocol Corporate Standard is the expected baseline for most UK customer requests, and it's what UK Government emission factors are designed to support. - Does my customer need the full backup documentation immediately?
Usually not upfront, but they expect it to exist. Keep source documents — bills, receipts, logs — ready in case it's requested later. - Can I reuse this footprint for future customer requests?
Yes — once you have a baseline with proper methodology and evidence trails, subsequent requests are largely a matter of updating the reporting period rather than starting again.
Related data-source guides
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Get your customer-ready carbon footprint report
We'll work with your existing energy, fuel and travel data to produce a GHG Protocol-aligned report — typically delivered within 10 working days.