If you are a sustainability manager, CFO, or procurement head at a listed Indian manufacturing company, BRSR Core is now your most pressing compliance obligation. SEBI introduced it as a mandatory extension of the existing Business Responsibility and Sustainability Report — but with a critical difference: BRSR Core requires assurance. That means an external auditor must verify your numbers.
For most companies, the data is straightforward for Scope 1 and Scope 2 emissions — your own factory floors, your own electricity bills. But BRSR Core also requires disclosure of value chain emissions, and that means going upstream into your supplier network. This is where the real challenge begins.
What is BRSR Core, exactly?
BRSR Core is a subset of the full BRSR framework, containing 49 mandatory Key Performance Indicators (KPIs) that SEBI has deemed essential for investor-grade ESG disclosure. Unlike the broader BRSR — which has over 150 data points — BRSR Core is deliberately focused on what can be measured, verified, and compared across companies.
SEBI first mandated BRSR Core for India's top 150 listed companies by market capitalisation from FY 2024–25. The phase-in is deliberate: SEBI expects these 150 companies to demonstrate what good ESG disclosure looks like, before the obligation extends further down the market-cap ladder in subsequent years.
BRSR Core applies to the top 150 listed companies from FY 2024–25, expanding to the top 250 companies in subsequent phases. But even if your company is not yet in scope, your customers who are listed may already be asking you for this data.
The 49 KPIs: What actually needs to be disclosed
The 49 KPIs inside BRSR Core span nine principles covering everything from energy and water to employee wellbeing and anti-corruption. But for manufacturing companies, three clusters of KPIs carry the most weight — and the most complexity:
| KPI Cluster | Key Metrics | Where supplier data is needed |
|---|---|---|
| Greenhouse Gas Emissions | Scope 1, 2, and 3 emissions (tCO₂e); emission intensity per rupee of turnover | Scope 3 Category 1 (purchased goods from suppliers) requires supplier-specific activity data |
| Energy Consumption | Total energy consumed; renewable vs. non-renewable split; energy intensity | Supplier energy use feeds into Scope 3 Category 1 calculations |
| Water Usage | Total water withdrawal; water intensity; water recycled | Supplier water use is increasingly requested for high-water-risk categories |
The GHG emissions cluster is where the greatest complexity lies — and where most companies are currently underprepared. Scope 1 and 2 are manageable with internal data. Scope 3 is the problem.
Why Scope 3 emissions are the hardest part of BRSR Core
Scope 3 emissions are all indirect emissions in your value chain — both upstream (suppliers) and downstream (customers, logistics, product use). For a typical Indian manufacturing company, Scope 3 can account for 60–80% of total emissions. The largest component is almost always Category 1: purchased goods and services.
To calculate Scope 3 Category 1 accurately under GHG Protocol methodology, you need emissions data from each supplier — their electricity consumption, fuel use, and process emissions, converted into CO₂ equivalent using India-specific emission factors (such as the CEA grid factor for 2024). This is not something you can estimate with a generic industry average and expect an external auditor to accept.
The practical reality? Most of your suppliers — especially MSMEs in Chennai, Pune, or Bangalore manufacturing clusters — have never measured their emissions. They do not have the tools. They do not have the expertise. And they do not yet understand why it matters. Getting this data manually, at scale, across 30 to 300 suppliers, is where BRSR Core compliance breaks down in practice.
The Supplier Data Problem, in numbers
In a survey of manufacturing supply chains across India's industrial clusters, fewer than 5% of MSME suppliers currently maintain any form of carbon or energy tracking data. The remainder rely on paper-based utility bills, manual production logs, or no records at all.
For an anchor buyer with 100 suppliers, this means building a supplier data collection infrastructure from scratch — or finding a platform that can do it for you.
What assurance actually means for BRSR Core
The word "assurance" in BRSR Core is consequential. It means that unlike traditional CSR reports, where you could present aspirational narratives, BRSR Core data must be verified by a qualified external assurer — typically a CA firm or specialist sustainability assurer empanelled with SEBI.
Assurance creates a chain of evidence requirement. Your assurer will want to trace every number back to a primary source: utility bills, production records, emission factor databases. If your Scope 3 data is based on supplier self-declaration with no supporting documentation, it will not pass assurance. You need an audit trail — a systematic record of what data was collected, from which supplier, on which date, using which methodology.
The BRSR Core timeline: where you should be right now
FY 2024–25 was the first mandatory year for the top 150 companies. Reports are due within 60 days of the financial year end — meaning September 2025 for FY25 filings. If you are among the top 150 and have not yet established your Scope 3 supplier data pipeline, you are already behind. If you are in the top 250 and preparing for FY 2025–26, you have one year to build the infrastructure before it becomes mandatory for you.
The companies that get ahead of this now will have a structural advantage. Supplier data collection is not something you can compress into six weeks before a reporting deadline. It takes time to onboard suppliers, train them on data submission, validate the data, and generate audit-ready reports.
How Emisso approaches BRSR Core supplier data
Emisso was built specifically for this problem. Our platform digitises supplier data collection across manufacturing clusters, handling the reality that most MSME suppliers still operate with paper bills and manual records. We use OCR with confidence scoring to extract data from utility bills, apply CEA 2024 grid emission factors, and generate immutable audit trails that satisfy third-party assurance requirements.
For each supplier, we calculate a Green Score (0–100) based on emission intensity, year-on-year improvement, and data completeness — giving anchor buyers a portfolio view of their supply chain ESG performance. And every report we generate is formatted for BRSR Core disclosure, with CBAM export capability built in.
BRSR Core is not a compliance checkbox. It is the beginning of a new era of verified, investor-grade ESG disclosure in India. The companies that build robust supplier data pipelines now will be the ones that report with confidence — and face assurance with nothing to hide.
What to do next
If you are preparing for BRSR Core, here are the three most important steps to take immediately:
- Map your Scope 3 exposure. Identify your top 20–30 suppliers by spend and estimate which of them represent the greatest emissions risk. Prioritise data collection from these suppliers first — they will account for the majority of your Scope 3 Category 1 footprint.
- Establish your methodology. Commit to GHG Protocol Scope 3 Category 1 methodology, using India-specific emission factors from CEA. Do not use global averages — your assurer will challenge them, and they will not reflect your actual supply chain reality.
- Build your audit trail now, not at reporting time. Every data point you collect needs a source document, a collection date, and a validation record. If you are collecting data manually, start building this discipline immediately. If you are evaluating a platform, assurance-readiness should be your first question.
BRSR Core compliance is hard. But the companies that treat it as an operational challenge — not a reporting exercise — will build supply chains that are genuinely more resilient, more trusted, and more competitive in an era where ESG credentials are becoming a commercial requirement, not just a regulatory one.