Accurate SECR calculations are an essential part of preparing a Streamlined Energy and Carbon Reporting report.
Qualifying businesses need to understand how much energy they consume, calculate the associated greenhouse gas emissions and present the information using appropriate reporting methods.
Although the calculations themselves can be straightforward, errors can occur when businesses use inconsistent units, incomplete energy data or incorrect emissions factors.
This guide explains how SECR calculations work, what information businesses need and how to approach the process in a structured way.
What Are SECR Calculations?
SECR calculations involve converting relevant energy consumption data into a consistent format and calculating the associated greenhouse gas emissions.
The process generally includes:
- Collecting energy consumption data.
- Converting the data into appropriate units.
- Applying the relevant emissions factors.
- Calculating greenhouse gas emissions.
- Determining an appropriate energy-intensity ratio.
- Reviewing and documenting the methodology.
The precise calculation requirements depend on the organisation’s reporting scope and circumstances.
What Energy Data Is Used for SECR Calculations?
Businesses should identify the energy sources relevant to their reporting obligations.
This may include:
- Electricity purchased and consumed.
- Gas used in buildings or operations.
- Transport fuel.
- Other relevant energy sources.
The information may come from:
- Utility bills.
- Meter readings.
- Supplier statements.
- Fuel records.
- Fleet management systems.
- Landlord or facilities-management records.
The objective is to establish a reliable record of the energy consumed during the relevant financial year.
Step 1: Collect and Review Energy Consumption Data
The first stage is to gather the available energy data and check that it covers the correct reporting period.
Businesses should review:
- Whether all relevant sites are included.
- Whether the figures cover the full financial year.
- Whether any bills or readings are missing.
- Whether estimated readings have been used.
- Whether the units are consistent.
- Whether energy consumption has changed significantly from the previous year.
Where data is incomplete, businesses may need to use appropriate estimates or obtain additional information.
Any assumptions should be documented so that the calculation process remains transparent.
Step 2: Convert Energy Data into Consistent Units
Energy consumption may be recorded in different units depending on the energy source and supplier.
For example:
- Electricity may be recorded in kilowatt-hours (kWh).
- Gas may be recorded in kWh or other units.
- Fuel may be recorded in litres.
- Other energy sources may require separate conversion methods.
Before calculating emissions, businesses should ensure that the data is expressed in the appropriate units for the relevant emissions factors.
Inconsistent units can lead to significant calculation errors, so this stage should be checked carefully.
Step 3: Apply the Correct Emissions Factors
Once the energy consumption data has been collected and standardised, the relevant emissions factors can be applied.
Government-published greenhouse gas conversion factors are generally used to calculate the emissions associated with energy consumption.
The calculation is typically:
Energy consumption × Relevant emissions factor = Greenhouse gas emissions
For example, if a business consumes a known quantity of electricity, the relevant electricity emissions factor can be applied to estimate the associated emissions.
The correct factor depends on the energy source, reporting year and applicable methodology.
Businesses should always use the appropriate conversion factors for the reporting period rather than relying on figures from a previous year without checking.
Step 4: Calculate Total Greenhouse Gas Emissions
After calculating emissions for each relevant energy source, the figures can be combined to establish the organisation’s total reported greenhouse gas emissions.
A simplified example might look like this:
| Energy source | Consumption | Emissions factor | Calculated emissions |
|---|---|---|---|
| Electricity | 100,000 kWh | Applicable factor | Calculated result |
| Gas | 50,000 kWh | Applicable factor | Calculated result |
| Transport fuel | 10,000 litres | Applicable factor | Calculated result |
Note: The figures above are illustrative only. Actual SECR calculations must use the appropriate conversion factors and reporting methodology for the relevant year.
The final report should clearly explain how the figures have been calculated.
Step 5: Determine the Energy-Intensity Ratio
SECR reporting generally requires an energy-intensity ratio.
This compares energy consumption against an appropriate business metric.
Depending on the organisation, this could be based on:
- Revenue.
- Floor area.
- Production output.
- Number of employees.
- Another relevant operational measure.
A simplified formula is:
Total energy consumption ÷ Relevant business metric = Energy-intensity ratio
For example, a business may calculate energy consumption per square metre of floor space or per unit of production.
The most appropriate ratio depends on the organisation’s activities and reporting circumstances.
Step 6: Review the Calculations
Before finalising the report, businesses should review the calculations for consistency and accuracy.
Useful checks include:
- Confirming that all relevant energy sources are included.
- Checking that the reporting period is correct.
- Reviewing unit conversions.
- Confirming that the correct emissions factors have been used.
- Checking arithmetic and totals.
- Comparing results with previous reporting periods.
- Investigating unusual changes in energy consumption.
- Confirming that the intensity ratio is calculated correctly.
A review process can help identify errors before the information is included in the annual report.
Common SECR Calculation Mistakes
Using the Wrong Reporting Year
Emissions factors can change, so businesses should use the appropriate factors for the relevant reporting period.
Mixing Energy Units
Combining kWh, litres and other units without appropriate conversion can produce inaccurate results.
Using Incomplete Data
Missing sites, bills or fuel records can lead to under-reporting.
Applying the Wrong Emissions Factor
Different energy sources require different factors, and the correct methodology should be used.
Failing to Document Estimates
Where estimates are necessary, businesses should record how they were calculated and why they were used.
Choosing an Unsuitable Intensity Ratio
The ratio should be relevant to the organisation’s activities and provide meaningful context for energy performance.
How Can Businesses Improve Their SECR Calculation Process?
A consistent process can make annual reporting more efficient.
Businesses should consider:
- Keeping energy records in a central location.
- Reviewing data regularly rather than only at year-end.
- Maintaining a record of reporting assumptions.
- Using consistent calculation methods.
- Reviewing changes in energy consumption.
- Keeping copies of the conversion factors used.
- Coordinating energy data collection with the annual reporting timetable.
These steps can reduce the risk of errors and make future reporting easier.
How CN Investments Can Help with SECR Calculations
SECR calculations require accurate data, appropriate emissions factors and a clear understanding of the reporting methodology.
At CN Investments, we support businesses with the practical aspects of SECR reporting, including reviewing relevant energy data, supporting emissions calculations and preparing clear reporting information.
We can also help businesses understand how their energy performance connects with wider energy-efficiency and carbon reduction objectives.
If you need support with SECR calculations, data collection or the preparation of your annual reporting information, contact CN Investments to discuss your requirements.
Conclusion
SECR calculations provide the foundation for accurate energy and carbon reporting. By collecting reliable data, using the correct units and emissions factors, and reviewing the results carefully, businesses can improve the quality and consistency of their reporting.
Preparing early and maintaining a structured calculation process can also help organisations identify energy-efficiency opportunities and support longer-term carbon reduction planning.
