Carbon accounting is entering a more demanding phase.
For many companies, greenhouse gas emissions data now supports sustainability reporting, net-zero targets, procurement decisions, investor communication, climate-risk assessments, customer questionnaires, and assurance readiness. This means emissions calculations can no longer sit in disconnected spreadsheets with limited evidence and unclear ownership.
The GHG Protocol Scope 2 and Scope 3 updates are important because they may influence how companies account for purchased electricity, renewable energy instruments, value-chain emissions, supplier data, and emissions-reduction claims. Companies that prepare early will be better placed to respond when revised guidance becomes operational.
The issue is not only technical. It is strategic. Carbon accounting is becoming part of business control, data governance, procurement maturity, and corporate credibility.
Carbon accounting used to be a specialist sustainability task. It is now part of the wider operating system of responsible business.
Emissions data supports:
The Greenhouse Gas Protocol Corporate Standard remains one of the most widely used foundations for corporate emissions inventories. It provides requirements and guidance for companies preparing corporate-level greenhouse gas inventories and supports consistency and transparency in emissions accounting.
As reporting expectations increase, companies need stronger controls over the way emissions data is collected, calculated, reviewed, and disclosed.
A weak emissions inventory can affect more than the sustainability report. It can undermine target validation, customer trust, financing conversations, procurement eligibility, and assurance outcomes.
A carbon inventory usually divides emissions into three scopes.
Emissions Scope | What It Covers | Common Examples |
Scope 1 | Direct emissions from sources owned or controlled by the company | Fuel combustion, company vehicles, boilers, generators, refrigerant leakage |
Scope 2 | Indirect emissions from purchased or acquired electricity, steam, heat, and cooling | Electricity used in offices, factories, warehouses, malls, hotels, data centres, and production sites |
Scope 3 | Other indirect emissions across the company’s value chain | Purchased goods, capital goods, logistics, business travel, employee commuting, product use, waste, leased assets, investments |
Scope 2 and Scope 3 are often the most difficult areas for companies because they depend on external data, contractual instruments, supplier information, value-chain assumptions, and consistent calculation methods.
This is why the GHG Protocol Scope 2 and Scope 3 updates matter. They may affect the technical foundation of corporate emissions reporting.
Scope 2 emissions are connected with purchased electricity and other forms of purchased energy. The current Scope 2 Guidance allows companies to report using two methods:
Method | Meaning |
Location-based method | Uses average emissions intensity of grids where electricity consumption occurs. |
Market-based method | Reflects emissions from electricity that companies have contractually purchased, including instruments such as renewable energy certificates where quality criteria are met. |
This dual reporting approach was designed to improve transparency around both grid emissions and contractual energy choices.
However, the electricity system has changed significantly. More companies are buying renewable energy certificates, entering power-purchase agreements, setting 24/7 clean-energy targets, and making claims about renewable electricity use.
The central question is whether annual matching of electricity consumption with certificates is enough to support credible claims, or whether companies should move toward more granular approaches that consider when and where electricity is consumed and generated.
This debate has created strong views across business, technology, energy, investor, and sustainability communities.
Companies often use annual matching to compare total electricity consumption during a year with renewable energy certificates or contracted clean electricity over the same period.
A more granular approach would look at time and location more closely.
Approach | What It Means | Why It Matters |
Annual matching | Electricity consumption over a year is matched with renewable energy certificates or contracted clean power over the year. | Easier to implement but may not reflect actual grid conditions when electricity is consumed. |
Hourly matching | Electricity consumption is matched with clean electricity generation on an hourly basis. | Gives a more precise view of clean-energy use but may increase complexity and cost. |
Location matching | Electricity claims are connected more closely with the grid or market where consumption occurs. | Helps assess whether clean-energy claims are relevant to the electricity system used by the company. |
Consequential or impact accounting | Focuses on the broader emissions impact of electricity-sector actions outside the corporate inventory. | Can support investment decisions but needs clear separation from inventory accounting. |
Companies should not wait for the final revised guidance before improving their data systems. Even if the final position differs from current proposals, stronger electricity data, contract documentation, and certificate tracking will remain valuable.
Some companies may be tempted to wait until revised standards are finalised. That would be a mistake.
Most preparation work will remain useful regardless of the final technical outcome. Companies can already improve:
Carbon accounting updates usually create pressure where companies have weak underlying systems. A company with strong data architecture can adapt more easily.
A mature carbon accounting system should be able to answer four questions:
Question | Why It Matters |
Where did the data come from? | Supports traceability and assurance. |
How was it calculated? | Supports consistency and comparability. |
Who reviewed it? | Supports governance and internal control. |
What changed from last year? | Supports management analysis and progress tracking. |
A reliable system does not depend only on software. It depends on process design, evidence quality, ownership, methodology, and review discipline.
Companies should confirm which entities, facilities, joint ventures, subsidiaries, leased assets, and operational activities are included in the inventory.
Boundary decisions should be documented clearly. Questions to ask include:
Scope 2 data should be reviewed carefully because electricity accounting is central to the current revision debate.
Companies should assess:
Companies with multiple facilities should consider whether site-level data is available and whether annual consumption can be broken down by location, provider, and tariff.
Renewable-energy certificates, guarantees of origin, I-RECs, power-purchase agreements, and green tariffs should be documented with care.
Evidence should show:
This documentation supports market-based Scope 2 reporting and strengthens claims around renewable electricity.
Companies should screen all 15 Scope 3 categories and identify which categories are relevant and material. The screening should consider:
The result should be a documented Scope 3 relevance assessment.
Supplier data is often one of the weakest parts of carbon accounting. Companies should introduce structured supplier templates and prioritise high-emission suppliers.
A supplier data request may include:
Not every supplier needs the same level of detail. The request should be proportionate to the supplier’s materiality and the company’s reporting needs.
Emission factors should be controlled. Companies should document:
Uncontrolled emission-factor changes can create unexplained movements in reported emissions.
Carbon calculations should be reviewed in the same way that important management information is reviewed. Controls may include:
These controls become especially important where emissions data is used for external reporting, target validation, customer submissions, or assurance.
Science-based targets depend on credible emissions inventories.
If a company’s Scope 1, Scope 2, or Scope 3 baseline is weak, its target-setting process becomes fragile. Base-year errors can affect target ambition, progress tracking, and future validation.
The SBTi Corporate Net-Zero Standard Version 2.0 increases the need for implementation evidence, annual progress tracking, and credible emissions data. This makes carbon accounting readiness essential for companies preparing or renewing targets.
Companies should align:
A single controlled emissions-data system is better than separate files for every reporting purpose.
IFRS S2 requires companies applying the standard to disclose information about climate-related risks and opportunities that could reasonably affect their prospects.
Greenhouse gas emissions are a key part of climate disclosure because they help users understand a company’s exposure to transition risk, emissions intensity, target progress, and strategic resilience.
A company preparing for IFRS S2 should ensure that emissions data is:
Carbon accounting is therefore a disclosure-control issue, not just a technical calculation.
They refer to ongoing review and revision activity around the GHG Protocol’s Scope 2 Guidance and wider corporate carbon accounting guidance, including issues related to electricity emissions accounting, renewable-energy instruments, consequential methods, and value-chain emissions data.
Scope 2 accounting is being reviewed because electricity markets and corporate renewable-energy claims have evolved. Stakeholders are debating whether current annual matching approaches provide enough transparency, or whether more granular time- and location-based approaches are needed.
Location-based reporting uses average grid emissions factors for where electricity is consumed. Market-based reporting reflects emissions from electricity that companies have contractually purchased, including qualifying renewable-energy instruments.
Scope 3 depends on value-chain data outside the company’s direct control. It may require supplier information, customer-use assumptions, logistics data, spend records, product data, and emission factors.
No. Companies should strengthen data systems now. Better electricity data, supplier engagement, evidence files, calculation controls, and audit trails will remain useful under any revised guidance.
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