SCOPE 1, 2 & 3
practical accounting formulas & industry examples
Step-by-step arithmetic and real-world calculation examples for Scope 1 direct, Scope 2 energy, and Scope 3 supply chain greenhouse gas emissions across Indian and multinational industry verticals.
1. Emissions Accounting Framework Overview
Every corporate activity translates into carbon dioxide equivalent (CO2e) through mathematical multiplication of physical activity data against verified emission factors. Here is how real companies calculate each tier.
2. Scope 1 Direct Examples & Calculations
Example A: Captive Diesel Generator (DG Set)
A corporate office consumes 12,000 litres of high-speed diesel in backup generators during grid outages.
Factor: 2.68 kg CO2e / litre diesel (DEFRA / CEA standard)
Calculation: 12,000 L × 2.68 kg CO2e/L = 32,160 kg = 32.16 tCO2e
Example B: Facility HVAC Refrigerant Loss (Fugitive)
Annual chiller maintenance tops up 45 kg of R-410A refrigerant gas lost to valve leakage.
GWP: 2,256 (IPCC AR6 100-year metric)
Calculation: 45 kg × 2,256 kg CO2e/kg = 101,520 kg = 101.52 tCO2e
3. Scope 2 Indirect Examples & Calculations
Example: Manufacturing Plant Grid Electricity (Location vs Market)
A manufacturing facility consumes 850,000 kWh of grid electricity over the financial year.
Location-Based Method
Factor: 0.716 kg CO2/kWh (CEA India v20.0)
850,000 × 0.716 = 608.6 tCO2e
Market-Based (With Green PPA)
Procured 500,000 kWh solar PPA (0.00 factor) + 350,000 kWh residual
350,000 × 0.716 = 250.6 tCO2e
4. Scope 3 Value Chain Examples
Category 6: Corporate Business Travel (Air travel)
Employees complete 120 domestic round-trip flights between Delhi and Bengaluru (approx. 3,480 km per round trip, totaling 417,600 passenger-km).
Factor: 0.155 kg CO2e / passenger-km (ICAO / DEFRA domestic aviation)
Calculation: 417,600 p-km × 0.155 = 64,728 kg = 64.73 tCO2e
Category 4: Inbound Logistics Freight
Hauling 250 metric tonnes of steel components over 800 km by heavy articulated road trucks.
Activity: 250 MT × 800 km = 200,000 tonne-km
Factor: 0.105 kg CO2e / tonne-km (Heavy rigid diesel truck)
Calculation: 200,000 t-km × 0.105 = 21,000 kg = 21.0 tCO2e
5. Sector Profiles: IT, Pharma & Manufacturing
Dominant Scopes: Scope 2 (office & server power) + Scope 3 Cat 1 (cloud AWS/Azure spend) and Cat 7 (employee commute/WFH).
Dominant Scopes: Scope 1 (boiler steam & solvent reactions) + Scope 2 (cleanrooms) + Scope 3 Cat 1 (active pharmaceutical ingredients).
Dominant Scopes: Scope 1 (furnaces & foundry heat) + Scope 3 Cat 1 (raw billets) and Cat 11 (vehicle tailpipe lifecycle).
6. Frequently Asked Questions
What is the difference between Scope 1 and Scope 2?
Scope 1 represents emissions that physically emerge on-site from equipment you own (such as burning diesel in a generator). Scope 2 represents emissions generated off-site by the electric utility generating the power your office or plant buys from the grid.
How does ZeroCarbon automate these calculations?
ZeroCarbon connects directly to utility billing APIs, ERP purchase ledgers, and logistics waybills, applying verified CEA, DEFRA, and IPCC factors deterministically with an immutable SHA-256 audit seal.