California SB 253 Supplier Carbon Reporting Guide
This tool helps suppliers generate a GHG Protocol–aligned carbon emissions draft quickly, using only annual spend data.
Who this applies to (very important)
You may need to respond to SB 253–related requests if:
- You sell to California-based enterprises
- Your customer is subject to SB 253 climate disclosure rules
- You've been asked for Scope 1, Scope 2, or Scope 3 emissions (supplier data)
Even if your company is not based in California, SB 253 still affects you as part of your customer's value chain.
Why suppliers are suddenly being asked for this
SB 253 requires large companies operating in California to disclose full value-chain emissions. That means:
- They must collect emissions data from suppliers
- They will accept estimated, spend-based data from SMEs
- Silence or refusal creates procurement risk
Most suppliers are not expected to have perfect data—but they are expected to respond.
The common supplier problem
- SB 253 language is confusing and intimidating
- Consultants are expensive and slow
- Deadlines are short
- Guessing numbers can lead to rejection
You don't need an audit-grade report. You need a defensible draft that follows accepted standards.
How this tool helps (simple process)
1. Upload your annual spend or general ledger CSV
2. Expenses are classified into Scope 1, 2, and (optionally) key Scope 3 categories
3. Emissions are calculated using GHG Protocol–approved spend-based (EEIO) factors
4. You receive a professional PDF emissions draft suitable for supplier submission
No fuel logs or utility meter data required.
What you can generate
Choose based on what your customer requested:
Scope 1 & 2 Draft – $20
- Direct fuel and energy (Scope 1)
- Purchased electricity (Scope 2)
- Spend traceability table
- Methodology & scope boundary statement
- Supplier-ready PDF
Complete Draft (Scope 1, 2 & Top Scope 3) – $49
- Everything above, plus key Scope 3 categories (e.g. logistics, cloud services)
- Clearly disclosed assumptions
- Designed for SB 253–driven supplier requests
Is this acceptable for SB 253 supplier reporting?
Yes—for supplier data requests and questionnaires. This draft:
- Aligns with the GHG Protocol
- Uses recognized EEIO emission factors
- Clearly states assumptions and limitations
- Matches what California-regulated companies expect from suppliers
Note: This is not a statutory SB 253 filing. It is a supplier-facing emissions estimate, which is exactly what most SMEs are asked to provide.
Why suppliers choose this instead of consultants
- Fast: minutes, not months
- Affordable: $20–$49 vs thousands in consulting fees
- Clear: numbers + documented methodology
- Practical: built specifically for supplier responses
Most suppliers just need to respond correctly and on time.
Common questions
Does SB 253 apply directly to my company?
Maybe not—but it applies to your customer, which is why they're asking you.
Do I need California-specific activity data?
No. Spend-based estimates are commonly accepted for supplier disclosures.
Can this be updated later?
Yes. This draft provides a defensible baseline you can refine if needed.
Generate your SB 253 supplier carbon draft now
If a California-based customer has asked you for emissions data, don't delay your response. Upload your spend file and generate a compliant draft today.
Legal & Methodology Note: This report is an automated, spend-based emissions estimate generated in line with the GHG Protocol. It is intended for supplier disclosures related to SB 253 value-chain data requests. For statutory filings or audits, activity-based data and professional verification may be required.
