Supplier Emissions Data: How to Collect Scope 3 Data

You collect supplier emissions data by prioritizing the suppliers responsible for the largest estimated emissions, sending a specific request to the person who owns sustainability or environmental data at each company, and following up until you receive usable data or document a defensible estimate. You do not need primary emissions data from every supplier.

What is scope 3 supplier data, and how is it collected?

Scope 3 supplier data is the activity or emissions information you collect from companies you buy from, so purchased-goods and related Scope 3 categories are not based only on spend. Scope 3 data collection is the operating work of choosing which suppliers to ask, sending a specific request, following up, and deciding whether the return is usable.

That data usually includes some mix of:

• energy use, facility location, and production volume;
• supplier Scope 1 and 2 totals, with method and verification status;
• product-level or allocated emissions for a small set of key suppliers.

Scope 3 data collection is not a full corporate inventory. The inventory is your accounting file. The collection process is how primary numbers get into that file, or how you document a defensible estimate when the supplier cannot provide them.

Which suppliers should you prioritize first?

You do not need primary data from every supplier. Rank suppliers by estimated emissions contribution and improve data first for the activities that matter most.

• Emissions ranking: Use your Scope 3 screening inventory to identify the largest sources.
• Spend proxy: Use procurement spend when emissions estimates are unavailable, while documenting that spend may rank suppliers differently from emissions.
• Category risk: Prioritize raw materials, energy-intensive manufacturing, and transport-heavy categories even when spend is moderate.
• Batch in waves: Set a batch size your team can support and follow up before scaling.

Under the current SBTi Corporate Near-Term Criteria, Scope 3 targets must collectively cover at least 67% of total reported and excluded Scope 3 emissions when Scope 3 represents 40% or more of total emissions. That is a target-boundary rule, not a requirement to contact 67% of suppliers or collect primary data from all of them.

What data should you actually request?

Match the ask to supplier maturity. Start simple and deepen over reporting cycles. The following levels are a practical planning model, not an official GHG Protocol or SBTi taxonomy.

Tier	Ask	Best for
Level 1	Energy use, facility location, production volume	Suppliers with no emissions tracking
Level 2	Scope 1 and 2 totals, methodology, verification status	Suppliers with basic carbon accounting
Level 3	Product-level or allocated emissions, LCA data	Key strategic suppliers only

Provide a spreadsheet template with exact fields, reporting period, and deadline. Vague asks get ignored.

How should you frame the request?

Explain why you need the data, how it will be used, and what the supplier must do.

• Why you need it: Connect the request to a named climate target, accounting decision, customer requirement, or applicable disclosure obligation.
• Why it matters to them: Tie participation to sourcing decisions, annual requirements, or free tooling if you offer it.
• What exactly: Named fields, format, reporting year, and a specific due date.

How should you measure response?

There is no defensible universal response-rate benchmark for Scope 3 supplier campaigns. Define your denominator and track several outcomes separately:

• request delivered;
• supplier acknowledged;
• supplier submitted something;
• submission passed your acceptance criteria; and
• supplier progressed toward a target or reduction.

A high reply rate can still produce little usable data. Plan capacity around accepted outcomes and overdue next actions, not emails sent.

What follow-up cadence works?

The following is an example operating cadence. Shorten or extend it based on the deadline, supplier burden, and existing relationship.

1. Day 0: Initial request with template and deadline.
2. Day 14: Reminder to same contact.
3. Day 28: Alternate contact. Offer a 15-minute walkthrough call.
4. Day 42: Escalate through procurement or executive sponsors.
5. Day 56: Final notice. Non-response goes into supplier risk records.

A Senior SQE at a Fortune 100 life sciences company described the default failure mode: “You reach out 2, 3, 4, 5 times. Nobody responds. You just give up.” A defined cadence prevents that.

How do you run outreach alongside CDP, Watershed, or EcoVadis?

The disclosure platform and the outreach process do different jobs. CDP, Watershed, EcoVadis, and similar platforms can hold the request, questionnaire, or submitted data. Your team still needs an operating process for finding contacts, monitoring progress, following up, and escalating suppliers that stall.

Run a weekly status loop:

1. Export or sync the supplier list, platform status, questionnaire progress, deadline, and current contact.
2. Identify suppliers that have not connected, have made no progress, are overdue, or submitted data that failed review.
3. Contact the person from the last submission when that record is current. Find a new sustainability or environmental contact when the address bounces, the person has left, or the request remains untouched.
4. Pause routine reminders while a supplier is making progress. Resume them when progress stalls or the deadline approaches.
5. Stop the campaign only when the submission meets your acceptance criteria, not when the supplier merely replies or starts the questionnaire.
6. Record the accepted data, evidence, reviewer, and next reporting date in the system your emissions inventory uses.

This approach does not require replacing your carbon-accounting or assessment platform. It adds the contact and follow-up process that gets suppliers through it.

What should the supplier data tracker contain?

Keep one row per supplier and include enough information to determine the next action without searching through email. Download the supplier engagement campaign tracker (CSV) or use the fields below in your existing system.

Field	Why it matters
Supplier and stable ID	Prevents duplicate records after name changes
Estimated emissions and category	Sets priority and coverage
Requested data and reporting period	Makes completion testable
Primary and backup contacts	Supports replacement when a contact is stale
Delivery and platform status	Separates an undelivered request from a refusal
Questionnaire progress	Prevents reminders to suppliers actively completing it
Deadline and next action date	Keeps follow-up from depending on memory
Submission status and blocker	Distinguishes missing, received, returned, and accepted data
Evidence, reviewer, and review date	Preserves the audit trail

See How Do You Track a Supplier Sustainability Campaign? for the complete status model and weekly review process.

What do you do with non-responders?

You still need numbers for reporting. Document which suppliers gave primary data and which were estimated.

• Spend-based EEIO factors (most common fallback, accepted by GHG Protocol, CDP, and SBTi)
• Industry-average intensities when sector data exists
• Hybrid: Use primary data from responders to set category intensities for silent suppliers in the same category

Track the share of the inventory calculated with supplier-specific data and improve weak data in high-emitting activities over time. Preserve a consistent method or document recalculations so methodology changes are not mistaken for emissions reductions.

How does this work as a multi-year program?

One possible progression is:

• Year 1: Highest-emitting activities and priority suppliers. Level 1 or 2 data. Establish baselines.
• Year 2: Expand coverage. Upgrade Year 1 respondents to Level 2.
• Year 3+: Product-level data from key suppliers. Integrate into procurement decisions.

Frequently asked questions

Do you need to measure all of your suppliers’ emissions?

No. Your Scope 3 inventory must cover the relevant emissions sources, but that does not require primary data from every supplier. Prioritize high-emitting activities and use documented secondary estimates where supplier-specific data is unavailable. If you have an SBTi target, calculate its coverage under the current 67% collective Scope 3 target rule rather than treating that threshold as a data-request quota.

What if a supplier has never tracked emissions?

Start with Level 1 activity data (energy use, location, volume). It beats spend-based estimates and is a realistic first ask.

What is scope 3 product data exchange?

Scope 3 product data exchange is a product-level or allocated emissions request, not a company-total request. Ask for it only from key suppliers where a product carbon footprint or allocated figure will change a sourcing or design decision. For everyone else, company or facility activity data is the realistic first return.

Does CSRD change the urgency?

For companies that remain in scope, current ESRS requires climate disclosures when climate is material, including significant Scope 3 categories. The 2026 EU changes narrowed CSRD scope and limit information that an in-scope reporter can demand from protected smaller value-chain companies solely for CSRD reporting. CSRD creates duties for the reporting company, not a direct reporting duty for every supplier.

For the complete program around this data-collection work, see Scope 3 Supplier Engagement: How to Build and Run the Program.

Where Bridgecurrent fits

Bridgecurrent finds the sustainability or environmental contact at each supplier and runs the follow-up sequence until data comes back or the supplier is flagged for escalation. Book a 20-minute call and bring a supplier list. We will show you who we find at each one and how the open Scope 3 requests would move.