CEA Grid Emission Factors Explained: What Every Compliance Team Needs to Know

Your Scope 2 emission number hinges on a single value: the CEA grid emission factor. Use the wrong version, and your entire emission intensity calculation shifts. Use it correctly, and you have a verifiable, ACVA-ready Scope 2 figure that will hold up under scrutiny.

The Central Electricity Authority (CEA) publishes the CO2 Baseline Database for the Indian Power Sector annually. The latest release (Version 21.0, November 2025) covers data up to FY 2024-25. This database is the authoritative source for Scope 2 emission calculations under both the CCTS and SEBI's BRSR reporting framework.

Yet most compliance teams treat this factor as just a number to plug in. Understanding what the factor actually represents, how it is calculated, and why it changes year over year gives you better control over your emission intensity trajectory.

What the Grid Emission Factor Represents

The grid emission factor expresses the average CO2 emissions per unit of electricity delivered by the Indian power grid. The current weighted average is:

0.710 tCO2/MWh (FY 2024-25, CEA Version 21.0)

This means that for every megawatt-hour of electricity your facility purchases from the grid, the power system emitted an average of 0.710 tonnes of CO2 to generate and deliver it.

The word "average" is doing important work here. India's grid is a mix of coal-fired thermal plants (which emit heavily), gas plants (which emit less), nuclear plants (zero operational emissions), and renewable sources like solar and wind (zero emissions). The grid emission factor is a weighted average across all these sources, reflecting the actual generation mix in a given year.

How CEA Calculates the Factor

CEA's methodology is well-documented in each version's User Guide. The calculation follows these steps:

Step 1: Determine total CO2 emissions from all thermal power stations connected to the grid. This includes coal, lignite, gas, diesel, and naphtha-based plants. Emissions are calculated from actual fuel consumption and plant-specific emission factors.

Step 2: Determine total net electricity generation from all sources (thermal, nuclear, hydro, solar, wind, biomass, and other renewables).

Step 3: Divide total thermal CO2 emissions by total net generation to get the weighted average emission factor.

The factor is published as a single national figure, though CEA also provides regional grid factors for the five regional grids (Northern, Southern, Eastern, Western, and North-Eastern). For CCTS purposes, BEE prescribes the use of the national weighted average.

The Trend: India's Grid Is Getting Cleaner

Here is the trajectory of CEA's weighted average grid emission factor over the past decade:

• FY 2013-14: 0.82 tCO2/MWh
• FY 2015-16: 0.79 tCO2/MWh
• FY 2017-18: 0.78 tCO2/MWh
• FY 2019-20: 0.76 tCO2/MWh
• FY 2021-22: 0.72 tCO2/MWh
• FY 2023-24: 0.727 tCO2/MWh
• FY 2024-25: 0.710 tCO2/MWh

That is a 13% reduction over a decade, driven almost entirely by the growth of renewable energy capacity. India's RE generation rose from 53 billion units (BU) in FY 2013-14 to 255 BU in FY 2024-25 — nearly a fivefold increase.

For CCTS-obligated entities, this trend is good news. Your Scope 2 emissions decline automatically as the grid gets cleaner, even if your facility's electricity consumption stays the same. A chlor-alkali plant consuming 450,000 MWh annually saw its Scope 2 footprint drop from 369,000 tCO2 (using the 2013-14 factor) to 319,500 tCO2 (using the 2024-25 factor) without changing a single operational parameter.

Which Factor Version to Use

This is a common source of confusion. The answer depends on your compliance year:

For CCTS FY 2025-26 compliance: Use the CEA factor corresponding to FY 2025-26 (when Version 22.0 is published, likely in late 2026). If Version 22.0 is not available at the time of reporting, BEE will prescribe which version to use. Check the BEE notification.

For CCTS baseline (FY 2023-24): Use Version 20.0 (0.727 tCO2/MWh), which covers FY 2023-24 data.

Critical rule: Use the same version of the CEA database for both your baseline and compliance year calculations when comparing emission intensity. If your baseline was calculated with Version 20.0, your compliance year should ideally use the corresponding version for that year to ensure a fair comparison.

Your ACVA will check which CEA version you cited. Inconsistency between versions used for baseline and compliance calculations is a common verification flag.

Impact on Different CCTS Sectors

The grid emission factor affects Scope 2 calculations uniformly, but its impact on total emission intensity varies dramatically by sector based on how electricity-intensive the production process is:

High Scope 2 sectors (Scope 2 is 50%+ of total emissions):

• Chlor-alkali (electrolysis is extremely power-intensive)
• Aluminium (Hall-Heroult process consumes ~14,000 kWh per tonne)
• Textiles (motor-driven spinning and processing)

For these sectors, a 1% decrease in the grid emission factor translates to roughly a 0.5% decrease in total emission intensity. The declining grid factor is a significant tailwind for meeting CCTS targets.

Low Scope 2 sectors (Scope 2 is 20% or less of total emissions):

• Cement (dominated by calcination process emissions)
• Iron and steel (dominated by coke oven and blast furnace Scope 1)
• Petroleum refining (dominated by furnace and process heater Scope 1)

For these sectors, the grid factor matters less. A cement plant whose Scope 2 is only 15% of total emissions sees minimal benefit from a declining grid factor. The compliance strategy here must focus on Scope 1 reduction levers.

Captive Power: A Common Trap

Many industrial facilities in India operate captive power plants (CPPs) — typically coal-fired thermal units that generate electricity on-site. This creates a frequent miscalculation:

Wrong approach: Applying the CEA grid factor to all electricity consumed, including captive generation. This understates actual emissions because coal-fired CPPs typically have a higher emission factor than the national grid average (which includes renewables).

Correct approach: Apply the CEA grid factor only to electricity purchased from the grid. For captive generation, calculate Scope 1 emissions using the actual fuel consumption of the CPP and the relevant IPCC emission factor for the fuel used.

For example, a steel plant that generates 60% of its electricity from a captive coal plant and purchases 40% from the grid needs to:

1. Calculate Scope 1 emissions from the CPP using coal consumption and IPCC factors
2. Calculate Scope 2 emissions from grid purchases using the CEA factor
3. Report them separately in the MRV forms

If the captive coal plant emits 0.95 tCO2/MWh (typical for older, less efficient units) and the grid factor is 0.71 tCO2/MWh, incorrectly applying the grid factor to captive generation would understate those emissions by 25%.

Renewable Energy and Scope 2

If your facility has invested in renewable energy — rooftop solar, a wind PPA, or purchased green power — how does this affect Scope 2?

On-site renewable generation (rooftop solar, on-site wind): This reduces the quantity of grid electricity purchased. Less grid purchase = lower Scope 2 emissions. The calculation is straightforward — your meter readings show reduced grid consumption.

Off-site renewable PPAs: This is more nuanced. Under the CCTS location-based approach, if the renewable energy is wheeled through the grid, the applicable emission factor is still the CEA grid average — because the physical electrons your facility receives are from the mixed grid. The renewable PPA may count for corporate sustainability claims and BRSR market-based reporting, but for CCTS Scope 2, the CEA grid factor applies.

Renewable Energy Certificates (RECs): Similarly, purchasing RECs does not change your CCTS Scope 2 calculation. RECs represent the environmental attribute of renewable generation, but under the location-based method mandated by CCTS, the emission factor remains the CEA grid average.

This distinction is important for financial planning. Investing in on-site solar directly reduces your CCTS Scope 2 emissions. Purchasing RECs does not. The compliance value of renewable energy depends on where and how it is consumed.

Using the Factor Effectively

For compliance teams preparing CCTS submissions, here is a practical checklist:

1. Download the latest CEA User Guide from the official CEA website. Confirm which version BEE has mandated for your compliance year.

1. Document the factor citation in your calculation workbook. Your ACVA will verify this reference. Include the version number, the fiscal year it covers, and the page reference.

1. Separate grid and captive electricity in your energy data. Apply the CEA factor only to grid purchases. Calculate CPP emissions separately as Scope 1.

1. Model the trend for future planning. If the grid factor continues declining at ~1.5% per year, your Scope 2 baseline decreases automatically. This is a free reduction that can help you meet tighter Year 2 targets.

1. Compare regional vs national factors if relevant. While BEE prescribes the national factor, understanding your regional grid's emission intensity helps you evaluate the impact of sourcing decisions (e.g., setting up a facility in a state with high renewable penetration).

CarbonNeeti's emission calculator automatically applies the correct CEA version for your baseline and compliance years, eliminating the manual factor-lookup process and ensuring calculation consistency across facilities.

The CEA grid emission factor is one of those numbers that seems simple but carries enormous weight. It affects every CCTS-obligated entity's Scope 2 calculation, influences compliance strategy, and changes every year. Understanding it properly is not optional — it is foundational.