A manufacturing company may have electricity bills for every facility, diesel records for generators and monthly production data. Yet, when a large customer asks for verified greenhouse gas emissions, the company may still be unable to provide a reliable answer.
The problem is usually not the absence of data. The problem is that information is spread across finance, production, procurement, maintenance, logistics, administration and human resources. Electricity is recorded in kilowatt-hours, fuel in litres, raw materials in tonnes, freight in kilometres and business travel in invoices. Unless this information is brought into one structured calculation system, the reported carbon footprint may remain incomplete.
A GHG Accounting Consultant in India helps organisations identify, calculate and report greenhouse gas emissions across Scope 1, Scope 2 and Scope 3. The objective is not only to prepare a final emissions number. The consultant must also establish the reporting boundary, validate activity data, select appropriate emission factors, document assumptions and create an evidence trail that can withstand customer review, BRSR assessment or independent verification.
For Indian manufacturers, exporters, listed companies, MSMEs and corporate groups, GHG accounting is increasingly becoming part of normal business reporting. Customers want supplier emissions data. Investors want climate-risk information. Listed entities require structured sustainability disclosures. Exporters may need product and facility-level carbon data. Companies announcing net-zero commitments need a measurable baseline.
A credible GHG inventory converts scattered operational records into a consistent, traceable and decision-ready emissions report.
Greenhouse gas accounting is the process of identifying, measuring, calculating and reporting emissions produced directly or indirectly by an organisation.
The final result is normally expressed in metric tonnes of carbon dioxide equivalent, written as tCO2e. Carbon dioxide equivalent allows different greenhouse gases to be presented in one common unit based on their relative climate impact.
A company may release carbon dioxide through fuel combustion, methane through waste or industrial processes and refrigerant gases through leakage from cooling equipment. Each gas has a different warming effect. GHG accounting converts these emissions into a comparable CO2e value.
A complete corporate GHG inventory should answer the following questions:
Without these controls, even a detailed carbon footprint report may contain material errors.
Corporate emissions are divided into 3 scopes to avoid confusion about ownership and responsibility.
Scope 1 covers direct emissions from sources owned or controlled by the organisation. Scope 2 covers emissions associated with purchased electricity, steam, heat or cooling. Scope 3 covers other indirect emissions occurring across the company’s value chain.
The 3 scopes should not be calculated separately without first establishing the organisational boundary. The same factory, vehicle, warehouse or leased facility may be treated differently depending on whether the company follows an operational-control, financial-control or equity-share approach.
Scope 1 emissions arise directly from sources controlled by the company.
For a manufacturing business, major Scope 1 sources may include boilers, furnaces, thermic fluid heaters, diesel generators, company-owned vehicles and industrial processes. Refrigerant leakage from air-conditioning and cooling equipment is also included.
A company operating 4 plants may have dozens of direct emission points. A single unit may contain 2 boilers, 3 diesel generators, 10 material-handling vehicles and more than 50 air-conditioning or refrigeration systems.
Typical Scope 1 sources include:
A common error is to calculate diesel and gas emissions while ignoring refrigerant leakage. Some refrigerants have a high global warming potential. Even a relatively small leakage quantity may create a material emission impact.
Maintenance records should therefore capture the type of refrigerant, opening stock, purchase quantity, recovery, disposal and refill quantity.
Scope 2 covers emissions resulting from purchased or acquired electricity, steam, heating and cooling.
For offices, warehouses, service businesses and light-manufacturing units, purchased electricity may represent the largest operational source of emissions.
The calculation normally begins with electricity consumption shown in monthly bills or meter records. Consumption is multiplied by an applicable electricity emission factor.
For example, a company with 5 facilities and 12 monthly electricity bills for each location may need to reconcile at least 60 records for one reporting year. If a factory has separate meters for production, utilities, accommodation and renewable power, the number of records may be much higher.
Scope 2 accounting should consider:
Electricity from renewable sources should not automatically be reported as zero-emission electricity. The company must review the contractual arrangement, certificate ownership, reporting boundary and applicable accounting method.
A sound report should also distinguish between location-based and market-based results where both methods are relevant.
Scope 3 includes indirect emissions from activities that are connected to the company but occur outside sources directly owned or controlled by it.
There are 15 recognised Scope 3 categories covering upstream and downstream activities. These categories may include purchased materials, capital goods, transportation, waste, employee travel, leased assets, product use and product end-of-life.
For many manufacturing companies, Scope 3 emissions may be significantly higher than Scope 1 and Scope 2 combined. Raw materials such as steel, aluminium, chemicals, plastics, cement and packaging can contribute heavily to the company’s value-chain footprint.
Scope 3 may include:
Scope 3 accounting is difficult because the information is often held by suppliers, transporters, employees, distributors and customers.
The first reporting year may require estimates. However, the company should create a 2-year or 3-year data-improvement plan so that major categories gradually move from financial estimates to physical and supplier-specific information.
A professional consultant does not begin by entering electricity and diesel figures into a spreadsheet. The first task is to understand why the company requires the inventory.
The reporting purpose may be BRSR disclosure, customer submission, ISO 14064 readiness, ESG rating improvement, net-zero planning, SBTi target development or export-related carbon reporting.
Each purpose may require a different level of detail.
A GHG accounting assignment generally includes:
The consultant should also clarify whether the inventory is being prepared for one legal entity, one plant, one business division or the entire corporate group.
Without this clarification, emissions may be double counted or omitted.
Boundary selection is one of the most important stages of GHG accounting.
A company may own 100% of one factory, hold 60% in a joint venture, operate a leased warehouse and outsource production to a contract manufacturer. The inventory must define which of these operations are included.
The 3 common consolidation approaches are:
Under the operational-control approach, the company normally reports 100% of emissions from operations where it has authority to introduce and implement operating policies.
The selected approach should be applied consistently across all sites and reporting years.
The company should also establish a base-year recalculation policy. Historical emissions may require recalculation when a major acquisition, divestment, outsourcing decision or methodology change affects comparability.
For example, if a business acquires 2 new factories that represent 25% of total production, comparing current-year emissions with the old base year without adjustment may produce a misleading reduction or increase.
GHG accounting is relevant to more businesses than only large listed corporations.
Listed entities may need emissions data for sustainability disclosures and assessment. Their suppliers may also receive detailed information requests because value-chain emissions form part of the customer’s Scope 3 inventory.
Exporters may be required to provide facility or product-level emission information to international customers. Companies participating in tenders may face climate and ESG questionnaires. Lenders and investors may ask for carbon-intensity data before financing an expansion project.
GHG accounting is commonly required by:
Even an MSME may need a GHG inventory when it supplies a large buyer that has committed to reducing Scope 3 emissions.
BRSR reporting requires companies to disclose environmental and sustainability information in a structured manner.
A reliable GHG inventory supports disclosures relating to Scope 1 emissions, Scope 2 emissions, emissions intensity, energy use and reduction initiatives.
The reporting team should not calculate emissions only at the end of the year. Data controls should operate monthly or quarterly so that errors can be corrected before annual reporting.
A BRSR-ready emissions file should normally contain:
Emissions intensity may be calculated against turnover, physical production or another relevant business metric. The selected denominator should remain consistent so that performance can be compared across reporting periods.
For example, absolute emissions may increase by 8% after a factory expansion, while emissions per tonne of production may reduce by 6%. Both figures are useful but they communicate different aspects of performance.
The GHG Protocol provides a widely recognised structure for corporate emissions accounting. It helps businesses define reporting boundaries, calculate Scope 1, Scope 2 and Scope 3 emissions and prepare consistent reports.
ISO 14064-1 provides requirements and guidance for quantification and reporting at the organisational level. It is commonly used when companies want stronger documentation, internal controls and independent verification readiness.
A company may use GHG Protocol principles while structuring the inventory to support ISO 14064 verification.
The main accounting principles are:
Completeness does not mean that every minor source must be measured with the same level of effort. It means that material sources should be included and exclusions should be justified.
A normal GHG accounting project may take between 6 and 14 weeks, depending on the number of facilities, availability of data and complexity of Scope 3 emissions.
The project begins with management, finance, sustainability and operations teams.
The consultant confirms the reporting purpose, period, included entities and required output.
Documents reviewed may include:
Each plant, office and warehouse is reviewed to identify potential emission sources.
The exercise covers boilers, generators, vehicles, electricity meters, cooling systems, process emissions, purchased materials, transport routes, waste streams and employee activities.
Missing a material source at this stage can affect the entire inventory.
Scope-wise data templates are issued to responsible departments.
A multi-location company may collect more than 500 records in one reporting cycle, including bills, logs, invoices and supplier data.
Common data sources include:
Data is checked for missing months, duplicate entries, inconsistent units and unusual changes.
For example, if electricity consumption falls by 30% while production increases by 20%, the consultant should investigate whether a meter, bill or facility has been excluded.
Activity data is multiplied by an appropriate emission factor.
The basic formula is:
GHG emissions = Activity data x Emission factor
Where required, the result is converted into CO2 equivalent using the applicable global warming potential.
Calculations are checked for unit conversion, factor selection and consistency.
A second-level review should examine material sources, high-value estimates and large year-on-year variations.
The final report should explain boundaries, methodology, assumptions, exclusions, data quality and scope-wise results.
Supporting documents are indexed so that an assessor or verifier can trace the reported number back to the original record.
Emission-factor selection can materially change the reported result.
A factor should match the activity type, unit, geography, fuel specification and reporting year as closely as reasonably possible.
The recommended hierarchy is:
The factor register should record the source, year, unit and reason for selection.
For example, using a kilogram-based factor with tonne-based activity data can overstate emissions by 1,000 times. Unit checks must therefore be built into the calculation workbook.
Scope 3 should begin with a screening exercise across all 15 categories.
The company should prioritise categories based on estimated emissions, financial value, customer interest, reduction opportunity and data availability.
Purchased materials can be calculated using physical quantities such as tonnes of steel or kilograms of plastic. When quantity data is unavailable, purchase value may be used, but the result will usually be less precise.
Freight calculations are more reliable when based on:
A supplier-engagement programme should focus first on the vendors contributing the largest emissions.
For example, 20 suppliers may account for 70% of the purchased-material footprint even when the company has more than 500 active vendors. Engaging the high-impact suppliers first is more practical than requesting detailed information from every supplier.
Many organisations prepare an inventory but still struggle during customer review or verification.
The most common problems include incomplete boundaries, missing refrigerants, incorrect factors and unsupported renewable-energy claims.
Other frequent errors are:
These errors can be avoided through clear ownership, standard templates and periodic internal review.
A manufacturing company operated 4 plants and 2 warehouses. Its customer requested Scope 1, Scope 2 and material Scope 3 emissions before renewing a long-term supply agreement.
The company had electricity and diesel records but had not previously prepared a corporate GHG inventory.
The first review identified 7 major data gaps:
The consulting team established operational control as the consolidation approach and prepared a central emissions-source register.
Approximately 480 monthly utility and fuel records were reconciled. The 15 Scope 3 categories were screened, after which purchased materials, transport, waste and business travel were identified as material.
The company collected physical data from 18 major suppliers and converted logistics information into tonne-kilometres. An emission-factor register and evidence index were created.
The final deliverables included:
The exercise showed that first-year GHG accounting is often a data-governance project. Once monthly responsibility is assigned to each department, the second-year inventory becomes faster and more reliable.
These terms are related but not identical.
GHG accounting is the process used to quantify emissions.
A corporate carbon footprint is the total emissions calculated for the organisation within a defined boundary and period.
A product carbon footprint calculates emissions connected to a specific product across defined life-cycle stages.
Net zero is a long-term reduction objective. It requires emissions reduction across relevant scopes and treatment of residual emissions according to the selected framework.
Buying offsets does not remove Scope 1 emissions from the gross corporate inventory. Offsets should normally be disclosed separately.
Similarly, GHG accounting does not automatically create carbon credits. A carbon-credit project requires an eligible methodology, baseline, monitoring process, validation and verification.
A professional engagement should create a reporting system, not only a final presentation.
Key deliverables may include:
The report should also identify the largest emission hotspots.
If 62% of total emissions arise from purchased steel and aluminium, replacing office lighting alone will not materially change the company’s overall footprint. Reduction planning must focus on the sources that drive the largest impact.
A GHG Accounting Consultant in India helps businesses convert operational, financial and supply-chain records into a structured Scope 1, Scope 2 and Scope 3 emissions inventory.
The value of the exercise goes beyond reporting. It helps the company understand where emissions arise, which data is unreliable, which suppliers require engagement and which reduction projects can produce measurable results.
Early implementation reduces the risk of customer rejection, reporting inconsistencies, unsupported climate claims and rushed year-end calculations.
A reliable inventory requires 5 basic elements:
Companies that build these controls early are better prepared for BRSR reporting, ISO 14064 verification, customer disclosures, ESG assessments, export requirements and long-term net-zero planning.
