Verification Preparation Before Year End: 4 Practical Tips

Verification Preparation Before Year End: 4 Practical Tips

Many companies leave emission inventory verification until year end. This situation both creates pressure on the team and extends the verification process. The year-end busyness of verification organizations makes scheduling appointments difficult and the process takes longer.

Verification tests the reliability of the system, not the accuracy of the calculation. Where did the data come from, how was it processed, what controls were applied? Providing clear answers to these questions speeds up the verification process and reduces finding risk.

In this article, we cover in detail four fundamental tips that systematize verification preparation. For each tip, we provide practical templates and checklists.

Tip 1: Organize data files

Raw data, calculation, and results should be in separate tabs. Formulas should be visible and traceable. The verifier should be able to start from any point and trace back to the source document.

Recommended file organization structure

Main folder structure:

• 00_Inventory_Report/
• 01_Raw_Data/
• 02_Calculation_Files/
• 03_Emission_Factors/
• 04_Supporting_Documents/
• 05_Internal_Control/
• 06_Verification_Communication/

01_Raw_Data subfolders:

• Energy_Bills/
• Fuel_Records/
• Production_Data/
• Transportation_Records/
• Waste_Reports/
• Business_Travel/

File naming standard: YYYY_CategoryCode_DataType_Version.xlsx Example: 2024_Scope2_Electricity_v3.xlsx

Calculation file tab structure:

1. Cover (inventory summary, date, version)
2. Raw Data (with source references)
3. Conversions (unit conversions, intermediate calculations)
4. Emission Factors (with source and year information)
5. Calculation (with visible formulas)
6. Results (summary tables)
7. Assumptions and Notes (list of all assumptions)

Traceability rules:

• No cell should contain "hard-coded" values (without source reference)
• Formulas should not be hidden
• Each row should have a source reference
• Intermediate calculations should not be deleted

Supporting files prepared for verifiers

• Organization boundary diagram (which facilities are included)
• Process flow diagram (emission sources)
• Data collection procedure
• Emission factor selection justification
• Recalculation policy

Tip 2: List emission factor sources

Which factor from which source, which year? This list should be ready. The verifier questions the selection rationale for each factor.

Emission factor documentation template

The following information should be recorded for each emission factor:

Factor hierarchy

GHG Protocol recommends the following hierarchy for factor selection:

1. Primary data: Specific factor from supplier or manufacturer
2. National factor: Turkey National Inventory Report (NIR) or official source
3. Regional factor: EU or regional databases
4. International factor: IPCC, DEFRA, EPA, IEA
5. Default value: IPCC default values as last resort

At each stage, if a higher-tier factor is not available, the reason is explained before moving to the lower tier.

Common factor errors

• Confusing location-based and market-based factors for electricity
• Confusing WTT (well-to-tank) and TTW (tank-to-wheel) factors
• Using factors from different years in the same inventory
• Inconsistent use of GWP reference (AR4, AR5, AR6)

Tip 3: Document exclusions

Which sources are excluded and why? Justifications should be clearly written. GHG Protocol requires exclusions to be justified.

GHG Protocol exclusion rules

GHG Protocol Corporate Standard allows exclusions under the following conditions:

De minimis:

• If a source accounts for less than 1% of total emissions, it can be excluded
• All exclusions combined should not exceed 5%
• Justification should be documented in all cases

Data unavailability:

• If data cannot be obtained with reasonable effort, it should be explained
• Data collection plan for future periods should be stated
• Estimated impact should be reported

Exclusion documentation template

Verifier expectations

Verifiers ask these questions:

• Where is the list of excluded sources?
• Has the estimated impact of each been calculated?
• How was the materiality threshold determined?
• Will they be included in scope in future periods?

Being prepared for these questions speeds up the verification process.

Tip 4: Run internal control process

Internal review should be conducted before verification. Having someone else check the file catches errors early. Internal control is like a "dress rehearsal" for external verification.

Internal review checklist

Data integrity checks:

• Does raw data match source documents?
• Are unit conversions correct?
• Are there errors in formulas?
• Does total = sum of sub-items?
• Does it make sense compared to last year?

Documentation checks:

• Is the source of each data item specified?
• Are emission factor references complete?
• Are assumptions documented?
• Are exclusions justified?
• Is organization boundary clearly defined?

Methodology checks:

• Is consolidation approach consistent?
• Scope 2: Is location-based and market-based distinction correct?
• Are Scope 3 categories correctly classified?
• Has base year recalculation policy been applied?

Format and presentation checks:

• Is report format compliant with standards?
• Are charts and tables consistent?
• Is rounding consistent?
• Are units clearly specified?

Timeline planning

Recommended timeline for verification:

Common findings from verifiers

According to our experience, the most frequently encountered verification findings are:

Major findings:

• Organization boundary not documented
• Exclusions not justified
• Emission factor source not specified
• Data trail cannot be followed (raw data → result)

Minor findings:

• Rounding inconsistency in some calculations
• Factor year doesn't match reporting year
• Small mathematical errors
• Missing explanations

Improvement recommendations:

• Conduct data quality assessment
• Add uncertainty analysis
• Develop recalculation policy

Preparing for site visit

If the verifier will conduct a site visit:

• Be ready to show meter readings
• Prepare fuel stock records
• Compile waste disposal documents
• Be ready to explain the data entry process
• Inform relevant personnel

Completing these steps before year end significantly facilitates the verification process and minimizes finding risk.