Templates8 min readUpdated May 2026

GHG Protocol Audit SOP: Ensure Emission Data Integrity

Having a well-structured audit checklist ghps is the single most important step you can take to ensure consistency, reduce errors, and save countless hours of repeated effort. Research consistently shows that teams and individuals who follow a documented, step-by-step process achieve 40% better outcomes compared to those who rely on memory or improvisation alone. Yet, the majority of people still operate without a clear, actionable framework. This comprehensive GHG Protocol Audit SOP: Ensure Emission Data Integrity template bridges that gap — giving you a battle-tested, ready-to-use guide that covers every critical step from start to finish, so nothing falls through the cracks.

Complete SOP & Checklist

Template Registry

Standard Operating Procedure

Registry ID: TR-AUDIT-CH

Standard Operating Procedure: Greenhouse Gas Protocol (GHGP) Audit

This Standard Operating Procedure (SOP) outlines the rigorous process for auditing Greenhouse Gas Protocol (GHGP) reporting. The objective of this audit is to ensure data integrity, verify adherence to the principles of relevance, completeness, consistency, transparency, and accuracy, and confirm that all Scope 1, 2, and 3 emissions are calculated in alignment with the World Resources Institute (WRI) and World Business Council for Sustainable Development (WBCSD) standards.

1. Governance and Organizational Boundary Verification

Confirm the chosen consolidation approach (Equity Share, Financial Control, or Operational Control).
Verify the organizational boundary map against current legal entity structures and organizational charts.
Document any exclusions of facilities or subsidiaries, ensuring they are justified with clear rationales.
Cross-check the list of legal entities included in the previous reporting cycle against the current cycle to ensure consistency.

2. Scope 1 (Direct Emissions) Audit

Reconcile fuel purchase invoices and delivery receipts against the fuel consumption ledger.
Verify emission factors used for mobile and stationary combustion (ensure they are the most recent versions, e.g., EPA, DEFRA, or IEA).
Check for the inclusion of fugitive emissions (refrigerants, HFCs, PFCs) and ensure that Global Warming Potential (GWP) values align with the latest IPCC Assessment Report.
Validate the methodology for calculating emissions from company-owned or controlled vehicles (fuel-based vs. distance-based).

3. Scope 2 (Indirect Energy Emissions) Audit

Verify electricity, steam, and heating/cooling invoices for all facilities within the organizational boundary.
Confirm that Location-Based and Market-Based calculations are both performed and clearly labeled.
Inspect Energy Attribute Certificates (EACs), Guarantees of Origin (GOs), or Power Purchase Agreements (PPAs) to ensure they meet the quality criteria (e.g., vintage, geography, and bundling).
Ensure that residual mix factors are applied correctly where specific supplier data is unavailable.

4. Scope 3 (Value Chain Emissions) Audit

Verify the categorization of all 15 Scope 3 categories; flag any categories marked as "not relevant" without documented support.
Audit data collection methods for "Purchased Goods and Services" (check spend-based vs. activity-based data accuracy).
Validate the primary data sources for "Upstream/Downstream Transportation" and "Business Travel" (e.g., travel agency reports vs. expense reimbursement logs).
Assess the rigor of estimations for categories involving secondary data or proxy industry averages.

5. Documentation and Quality Control

Confirm that all assumptions, conversion factors, and data gaps are documented in the internal audit trail.
Verify that any recalculations of base-year emissions are documented and explained (e.g., structural changes, divestments, or methodology improvements).
Perform a final sanity check of the emissions inventory against total production or revenue (intensity metric analysis).

Pro Tips & Pitfalls

Pro Tip: Maintain an "Audit Ready" file throughout the year. Do not wait until the end of the reporting period to collect utility bills or supplier emissions data.
Pitfall - Scope 2 Double Counting: A common error is claiming renewable energy attributes while simultaneously using a standard utility grid factor. Ensure your Market-Based calculation is distinct.
Pitfall - Outdated Factors: Using legacy emission factors (e.g., GWP values from the 2nd IPCC report) will lead to audit failure. Ensure you are referencing the latest available technical guidelines.
Pro Tip: Document your "Significant Threshold." If you exclude a minor source of emissions, ensure it is defined as immaterial and documented to avoid auditor findings.

Frequently Asked Questions (FAQ)

Q: How often should we conduct a baseline reassessment? A: You should trigger a baseline reassessment whenever there is a significant structural change in the company, such as a merger, acquisition, or divestiture, or if there is a major change in calculation methodology that significantly alters the base year profile.

Q: What constitutes a "significant" emission source? A: Significance is generally determined by your organization's materiality threshold. However, per the GHGP, you should include any source that exceeds 1-5% of your total emissions unless it is explicitly deemed non-contributory by the materiality policy.

Q: Can we use spend-based data for all of Scope 3? A: While spend-based data is acceptable under the GHGP for initial screenings, auditors prefer activity-based data (e.g., weight of material, distance traveled) as it is more accurate. Over-reliance on spend-based data can lead to lower data quality scores.

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