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GHG Accounting

What is GHG Accounting

GHG Accounting provides a systematic approach to measuring and reporting greenhouse gas emissions across an organisation’s operations and value chain. Based on the GHG Protocol, it establishes a credible emissions baseline that supports climate strategy, sustainability reporting, regulatory compliance, carbon reduction initiatives, and informed business decision-making.

Before an organisation can credibly commit to reducing its carbon footprint, it must first know what that footprint actually is — with enough precision, consistency, and methodological rigour to be trusted by those who will scrutinise it.
GHG Accounting is the structured discipline of measuring, calculating, and documenting an organisation's greenhouse gas emissions across all relevant sources and scopes.
Built on the GHG Protocol Corporate Standard — the globally dominant methodology framework — it distinguishes between three categories of emission: Scope 1, which covers direct emissions from owned or controlled sources; Scope 2, which addresses emissions from purchased energy; and Scope 3, which accounts for the broader value chain — the emissions that occur because of what the organisation buys, sells, uses, and disposes of.
For most organisations, a thorough GHG accounting exercise reveals that Scope 3 dominates the footprint — and that meaningful climate progress requires engaging suppliers, rethinking product design, and influencing customer behaviour, not just optimising internal operations.
That insight alone — delivered clearly and quantitatively — justifies the exercise.

Key Requirements of GHG Accounting

Comprehensive GHG Accounting requires organisations to define reporting boundaries, identify emission sources, collect accurate activity data, apply recognised calculation methodologies, and document results transparently. A robust emissions inventory provides the reliable foundation for climate reporting, target setting, verification, and long-term decarbonisation strategies.

Organisational boundary-setting using either the equity share or operational control approach, with documented rationale for the chosen method
Systematic identification of every emission source across Scope 1, Scope 2, and all applicable Scope 3 categories relevant to the organisation's activities
Activity data collection covering fuel combustion, process emissions, refrigerant losses, purchased electricity, business travel, freight logistics, supply chain procurement, product use, and end-of-life treatment
Application of current, source-appropriate emission factors drawn from recognised databases including IPCC, IEA, DEFRA, or nationally published inventories
Both location-based and market-based Scope 2 calculations where renewable energy instruments such as RECs or PPAs are in place
Documented uncertainty assessment identifying the confidence range of calculated emissions across data sources
A methodology document recording all assumptions, boundaries, emission factors, and calculation approaches in a form that supports year-on-year replication
Third-party verification under ISO 14064-3 or ISAE 3410 for inventories subject to external assurance requirements

Advantages to company doing GHG Accounting

GHG Accounting provides a credible emissions baseline that supports climate commitments, regulatory compliance, ESG reporting, and science-based target setting. It helps organisations identify reduction opportunities, strengthen supply chain transparency, manage carbon-related risks, and make informed decisions for long-term decarbonisation.

A credible, methodology-grounded baseline that makes every subsequent climate commitment - targets, net-zero pledges, reduction programmes — defensible rather than aspirational
Visibility into where emissions actually concentrate across the value chain, enabling interventions that deliver real reductions rather than marginal operational tweaks
A prerequisite for CDP Disclosure, SBTi target-setting, sustainability reporting, and ESG rating assessments that cannot be fulfilled without a sound underlying inventory
Demonstrated compliance with mandatory GHG reporting regulations where these apply, including energy-intensive industry requirements and supply chain disclosure mandates
A quantitative basis for carbon reduction investment decisions, linking operational changes to measurable emissions outcomes
Supply chain intelligence that positions the organisation to respond credibly when corporate customers request Scope 3 emissions data from their suppliers
Exposure management for emerging carbon pricing mechanisms, enabling cost modelling of future regulatory scenarios
The foundation for carbon credit generation, offset procurement, and net-zero pathway planning

Role of Blue Sky in GHG Accounting consulting

Blue Sky provides end-to-end GHG Accounting consulting, supporting organisations with boundary setting, data collection, emissions calculation, Scope 1, 2, and 3 inventories, documentation, and reporting aligned with CDP, SBTi, and globally recognised GHG accounting standards.

Guide on Getting reliable activity data from across a manufacturing facility, a logistics network, or a distributed services operation requires structured processes, cross-functional cooperation, and an understanding of where data lives and how accurate it actually is.
Guide on boundary-setting that bring together finance, operations, procurement, and facilities teams to agree on scope and data sources.
Guide on data collection tools calibrated to the organisation's existing systems, calculate emissions using the most appropriate methodologies for each source category, and produce a documented, verifiable inventory that meets the standards required by CDP, SBTi, and third-party verifiers.
For organisations receiving Scope 3 data requests from their corporate customers, we guide to develop the specific category inventories needed — and help communicate findings in the formats buyers expect.
We support end to end in GHG Accounting Consulting projects including Data collection framework, training about Data collection, follow up & facilitation till GHG Accounting is done for scope of project.

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