SCOPE 1, 2 & 3
complete corporate accounting manual
A comprehensive executive and practitioner guide to defining, calculating, and disclosing corporate greenhouse gas emissions across operational boundaries and global supply chains.
1. The Three Scopes Core Concept
Greenhouse gas accounting categorizes all corporate emissions into three scopes to avoid double counting across entities and establish clear boundaries of responsibility. Understanding this distinction is vital for accurate carbon accounting, meeting statutory disclosure requirements, and building credible decarbonization roadmaps.
Scope 1 (Direct)
Emissions that physically emerge from smoke stacks, exhaust pipes, or facilities owned or directly leased by your business.
Scope 2 (Energy Indirect)
Emissions produced by utility power plants and thermal generators to create the electricity, heat, or cooling your facilities consume.
Scope 3 (Value Chain)
Emissions embedded in purchased goods, freight, flights, waste disposal, and downstream product usage by end customers.
2. Scope 1 Direct Combustion & Process Emissions
Scope 1 emissions represent direct releases under your operational custody:
- Captive Power & Heating: Diesel fuel consumed in standby generators, natural gas in factory furnaces, and coal in industrial boilers.
- Fleet Operations: Gasoline and diesel combusted in owned delivery trucks, commercial vans, and executive cars.
- Industrial Chemical Reactions: Process off-gassing from smelting, fertilizer synthesis, and cement manufacturing.
- Fugitive Refrigerant Losses: R-134a, R-410A, and other fluorinated gases escaping from data center and office air conditioning systems.
3. Scope 2 Purchased Energy & Steam
Scope 2 reflects the indirect footprint of energy bought from external grids. Best practice and regulatory standards require dual reporting:
Location-Based Method
Calculates emissions using regional grid averages (e.g., Central Electricity Authority in India, eGRID subregions in the US). This shows the physical carbon intensity of the grid you plug into.
Market-Based Method
Accounts for contractual renewable purchasing such as offsite solar PPAs, green tariffs, and Energy Attribute Certificates (I-RECs, Guarantees of Origin).
4. Scope 3 Upstream & Downstream Value Chain
Scope 3 comprises all indirect upstream and downstream impacts across 15 categories. For service and technology companies, Category 1 (Purchased Goods and Services) and Category 6 (Business Travel) typically dominate. For manufacturers, Category 1 raw materials and Category 11 (Use of Sold Products) represent the majority of emissions.
5. Step-by-Step Measurement Strategy
Step 1: Set Boundaries
Define operational vs financial control and identify all physical facilities, subsidiaries, and leased spaces.
Step 2: Collect Primary Activity Data
Gather utility bills, meter intervals, fuel receipts, flight manifests, and purchasing ledger line items.
Step 3: Apply Verified Factors
Multiply physical units by accredited factors (CEA, DEFRA, US EPA) to compute CO2 equivalent totals.
6. Statutory Reporting & Decarbonization
Accurate scope measurement is now required by law under SEBI BRSR Core in India, the EU Corporate Sustainability Reporting Directive (CSRD), and California SB 253. ZeroCarbon automates all three scopes with audit-grade precision.