Scope 1 vs Scope 2 Emissions: A Practical Guide for Indian Industries

A steel plant in Jharkhand burns 400,000 tonnes of coking coal per year. It also draws 120 million kWh from the state grid. Both activities produce carbon dioxide, but they fall into two completely different emission categories under India's Carbon Credit Trading Scheme. Treating them the same way will get your MRV report rejected.

Under the CCTS, your emission intensity target is measured in tCO2e per unit of production. But reaching that number requires you to calculate Scope 1 and Scope 2 emissions separately, using different methodologies, different emission factors, and different data sources. Getting this distinction wrong is one of the most common errors in first-time compliance submissions.

What Are Scope 1 Emissions?

Scope 1 covers direct GHG emissions from sources that your facility owns or controls. For Indian industrial entities under the CCTS, this typically includes three categories:

Fuel combustion: Burning coal, natural gas, diesel, furnace oil, pet coke, or biomass in boilers, kilns, furnaces, or generators. Each fuel has a specific emission factor defined by the IPCC Guidelines for National Greenhouse Gas Inventories. For example, bituminous coal emits approximately 2.42 tCO2 per tonne burned, while natural gas emits about 2.02 tCO2 per 1,000 cubic metres.

Process emissions: Chemical reactions that release CO2 as a byproduct of production, not combustion. In cement manufacturing, the calcination of limestone (CaCO3 to CaO + CO2) accounts for roughly 60% of total emissions. In aluminium smelting, the anode consumption process releases CO2. These process emissions exist regardless of your energy source.

Fugitive emissions: Leaks from equipment, flaring, or venting. In petroleum refining, fugitive emissions from valves, flanges, and compressor seals can be significant. In most other CCTS sectors, fugitive emissions are a smaller fraction but still need to be accounted for.

The key characteristic of Scope 1: these emissions happen at your facility. You have direct operational control over them, and reducing them typically requires changes to fuel mix, process technology, or operational efficiency.

What Are Scope 2 Emissions?

Scope 2 covers indirect emissions from purchased energy — primarily grid electricity, but also purchased steam or heat if applicable. Your facility did not burn the fuel, but it consumed the electricity that a power plant generated by burning coal or gas.

Under the CCTS, Scope 2 emissions are calculated using the CEA's CO2 Baseline Database for the Indian Power Sector. The latest weighted average grid emission factor (Version 21.0) is 0.710 tCO2/MWh for FY 2024-25, down from 0.727 tCO2/MWh in FY 2023-24.

The calculation is straightforward:

Scope 2 emissions (tCO2) = Electricity consumed (MWh) x Grid emission factor (tCO2/MWh)

For a facility consuming 100,000 MWh annually, Scope 2 emissions would be approximately 71,000 tCO2. That single number can represent 20-40% of total emissions for electricity-intensive sectors like chlor-alkali or aluminium smelting.

A critical nuance: if your facility has captive power generation (a coal-fired captive plant or a diesel generator), those emissions are Scope 1, not Scope 2. Only electricity purchased from the grid or a third-party generator counts as Scope 2.

Why the Split Matters for CCTS Compliance

You might wonder why it matters whether an emission is Scope 1 or Scope 2, as long as the total adds up. Three reasons:

Different reduction levers: Scope 1 reductions require capital-intensive changes — switching from pet coke to biomass, upgrading kiln efficiency, installing waste heat recovery. Scope 2 reductions can be achieved by purchasing renewable energy, installing rooftop solar, or signing power purchase agreements (PPAs) with wind or solar developers. Knowing where your emissions concentrate tells you where to invest.

BEE reporting requirements: The MRV forms (especially Form A and Form C) require you to report Scope 1 and Scope 2 separately with distinct calculation sheets. Each scope has different emission factor citations and verification procedures. An ACVA will reject a report that lumps them together.

Emission factor updates: CEA updates its grid emission factor annually. As India adds more renewable capacity, the grid factor drops. This means your Scope 2 emissions decrease automatically over time, even without operational changes. Understanding this trend helps you model your compliance trajectory. Between FY 2013-14 and FY 2024-25, the grid emission factor dropped from 0.82 to 0.71 tCO2/MWh — a 13% reduction that benefits every CCTS-obligated entity.

How to Calculate: A Step-by-Step Example

Consider a chlor-alkali plant producing 100,000 tonnes of caustic soda per year.

Scope 1 Calculation

The plant uses natural gas for its boilers (15 million cubic metres/year) and diesel for backup generators (200 kilolitres/year).

• Natural gas: 15,000,000 m3 x 2.02 kgCO2/m3 = 30,300 tCO2
• Diesel: 200 kL x 2,676 kgCO2/kL = 535 tCO2
• Process emissions (membrane cell): Negligible for chlor-alkali
• Total Scope 1: 30,835 tCO2

Scope 2 Calculation

The plant purchases 450,000 MWh from the grid annually. Chlor-alkali is extremely electricity-intensive due to the electrolysis process.

• Grid electricity: 450,000 MWh x 0.710 tCO2/MWh = 319,500 tCO2
• Total Scope 2: 319,500 tCO2

Emission Intensity

• Total emissions: 30,835 + 319,500 = 350,335 tCO2
• Production: 100,000 tonnes caustic soda
• Emission intensity: 3.50 tCO2e per tonne of caustic soda

In this example, Scope 2 accounts for 91% of total emissions. The reduction strategy here is clear: securing renewable energy procurement would have a far greater impact than optimizing boiler efficiency.

Common Mistakes to Avoid

Counting captive power as Scope 2: If you generate electricity on-site using a coal-fired captive plant, those emissions are Scope 1. Use the fuel's IPCC emission factor, not the CEA grid factor.

Using outdated emission factors: CEA publishes a new version of its CO2 Baseline Database annually. Using last year's grid factor instead of the current one will produce incorrect Scope 2 numbers. Always use the factor corresponding to your compliance year.

Ignoring process emissions: For cement and aluminium, process emissions can exceed combustion emissions. Omitting calcination CO2 in a cement plant's Scope 1 calculation will understate total emissions by 50% or more.

Double-counting renewable energy: If your facility has a rooftop solar installation, the electricity it generates does not go through the grid. It reduces your grid electricity purchase, which automatically reduces Scope 2. Do not subtract it again separately.

Mixing units: Emission factors come in different units — kgCO2/kWh, tCO2/MWh, kgCO2/GJ, tCO2/tonne of fuel. Ensure consistent unit conversion before multiplication. One MWh equals 1,000 kWh, and getting this conversion wrong scales the error across your entire calculation.

What This Means for Your Compliance Strategy

Once you know your Scope 1 and Scope 2 split, your reduction strategy becomes much clearer:

Scope 2-heavy facilities (chlor-alkali, aluminium, textiles): Prioritize renewable energy procurement. A 50 MW solar PPA at current rates can reduce Scope 2 by 15-20% and is often the most cost-effective pathway to meeting your emission intensity target.

Scope 1-heavy facilities (cement, iron and steel, petroleum refining): Focus on fuel switching, process efficiency, and waste heat recovery. These are capital-intensive but necessary. Cement plants switching from OPC to blended cements (PPC, PSC) can reduce process emissions by 10-15% through clinker factor reduction.

Balanced facilities (fertilizer, petrochemicals): You need a dual approach. Optimize both fuel consumption and electricity procurement. These facilities often benefit most from comprehensive emission intensity calculators that model the impact of changes across both scopes simultaneously.

The CCTS compliance journey starts with accurate measurement. Until you know your Scope 1 vs Scope 2 breakdown, you are making reduction decisions in the dark. Get the measurement right first, and the compliance strategy follows naturally.