Your Emissions Data Is Now a Business Asset & Here's How to Measure It Right
Greenhouse gas (GHG) inventory used to be the domain of environmental engineers and sustainability specialists tucked away in large multinationals. By 2026, that has fundamentally changed. For Vietnamese manufacturers, exporters, and listed companies, a credible GHG inventory is now a core business requirement - one that directly affects supply chain contracts, access to green finance, regulatory compliance, and exposure to the EU's Carbon Border Adjustment Mechanism (CBAM). Yet despite this urgency, many businesses remain unclear on the basics: What exactly are Scope 1, 2, and 3 emissions? Where do you start? What level of accuracy is required, and by whom? This guide answers those questions in plain language - and maps them directly to the regulatory and commercial realities facing Vietnamese businesses today.
What Is a GHG Inventory & Why Does It Matter Now?
A greenhouse gas inventory is a structured accounting of all the greenhouse gases your organization emits and absorbs over a defined period, typically one calendar or fiscal year. It is the foundation of any credible sustainability disclosure and the prerequisite for setting carbon reduction targets, participating in carbon markets, and meeting regulatory reporting requirements. The most widely adopted methodology for corporate GHG accounting is the GHG Protocol Corporate Standard, developed by the World Resources Institute (WRI) and the World Business Council for Sustainable Development (WBCSD). This standard organizes emissions into 3 categories - Scope 1, Scope 2, and Scope 3 - each reflecting a different relationship between the emitting activity and your organization.
The business case for Vietnamese companies is clear and multi-directional:
Export market access: EU buyers operating under CSRD are required to report their Scope 3 emissions, which means your emissions data becomes their data requirement. Suppliers who cannot provide it risk losing contracts. Carbon market participation: Vietnam's domestic carbon market, currently in its pilot phase (2025 - 2028), will allocate and trade carbon quotas - a process that begins with an accurate emissions baseline. Green finance eligibility: A growing number of green loans and sustainability-linked bond programs, both domestic and international, require verified GHG data as a condition of access.
Scope 1: The Emissions You Directly Control
Scope 1 covers all direct greenhouse gas (GHG) emissions from sources owned or controlled by your organization. These are the emissions that come straight from your operations - the ones you are most immediately responsible for and, in most cases, most able to reduce. Common Scope 1 emission sources for Vietnamese companies include: Stationary combustion: Burning natural gas, coal, diesel, or biomass in boilers, furnaces, kilns, or on-site generators. Mobile combustion: Fuel burned by company-owned or company-controlled vehicles - trucks, forklifts, company cars, and marine vessels. Industrial process emissions: Releases from manufacturing processes involving chemical or physical transformation, such as cement production (calcination), steel production (reduction), or chemical manufacturing. Fugitive emissions: Unintentional releases, including refrigerant leaks from air conditioning and refrigeration systems (HFCs), methane leaks from equipment, or gas flaring. For most Vietnamese manufacturers in textiles, food processing, electronics assembly, and building materials - Scope 1 is the most straightforward category to measure. The data sources are relatively accessible: fuel purchase records, utility bills for on-site generation, and equipment logs. The key step is converting activity data (litres of diesel consumed, tonnes of coal burned) into CO₂-equivalent figures using standardized emission factors, such as those published by Vietnam's Ministry of Natural Resources and Environment (MONRE) or the IPCC. Important note: Scope 1 reporting must follow the operational control or equity share boundary - meaning you report emissions from facilities you operate, not just those you own.
Scope 2: The Emissions You Purchase
Scope 2 covers indirect greenhouse gas (GHG) emissions from the generation of purchased electricity, heat, steam, or cooling consumed by your organization. You do not produce these emissions directly - a power plant or utility does - but because your energy consumption drives their generation, those emissions are attributed to your operations. For most Vietnamese businesses, purchasing electricity from EVN (Vietnam Electricity) is the dominant Scope 2 source. The carbon intensity of that electricity - measured as the grid emission factor in kilograms of CO₂ per kilowatt-hour - determines how emissions-intensive your energy consumption is. The GHG Protocol recognizes two methods for calculating Scope 2 emissions: Location-based method: Uses the average emission factor of the national or regional grid. Market-based method: Uses contractual emission factors from energy attribute certificates (EACs) or power purchase agreements (PPAs). This approach becomes relevant when a company procures renewable energy directly and wants that choice reflected in its reported figures. Scope 2 is where energy efficiency investments have the most direct and measurable impact on your GHG footprint - a point that matters for both regulatory reporting and communications with buyers and investors.
Scope 3: Your Company's True Carbon Footprint
Scope 3 is where the complexity - and the strategic significance - of GHG accounting really comes into focus. It covers all indirect emissions occurring across your value chain, both upstream (from your suppliers and the goods you purchase) and downstream (from the use and disposal of your products by customers). In most industries, Scope 3 accounts for 70% to 90% of a company's total climate impact. The GHG Protocol identifies 15 categories of Scope 3 emissions: Upstream categories (your supply chain):
- Purchased goods and services (raw materials, components, packaging)
- Capital goods (machinery, equipment, buildings)
- Fuel- and energy-related activities not in Scope 1 or 2
- Upstream transportation and distribution
- Waste generated in operations
- Business travel
- Employee commuting
- Upstream leased assets Downstream categories (customers and end-of-life):
- Downstream transportation and distribution
- Processing of sold products
- Use of sold products
- End-of-life treatment of sold products
- Downstream leased assets
- Franchises
- Investments
Not every company will need the full 15 categories ESG report. The reason Scope 3 has shifted from optional to strategically essential in 2026 is the EU's CSRD: large European companies are now legally required to disclose their Scope 3 emissions, and their entire supply chain falls within that scope. This creates a direct commercial imperative for Vietnamese suppliers - those who can provide credible, structured emissions data will have a clear advantage.
How to Build Your GHG Inventory: A Step-by-Step Approach
Step 1 - Define Your Organizational Boundary Decide which entities, facilities, and operations are included in your inventory. Most Vietnamese companies starting out use operational control, as it aligns with where management responsibility sits. Step 2 - Define Your Reporting Period and Base Year Select a 12-month reporting period and establish a base year - the earliest year for which you have reliable data, typically the year you begin systematic measurement. Step 3 - Identify Emission Sources Conduct a systematic review of all activities within your boundary that generate emissions, working with operations, procurement, facilities management, and logistics teams. Step 4 - Collect Activity Data Gather the underlying data for each emission source: fuel consumption records, electricity bills, refrigerant purchase and top-up logs, logistics distance and weight data, supplier invoices for material quantities, and so on. Data quality at this stage determines the credibility of your entire inventory. Step 5 - Apply Emission Factors Convert activity data into CO₂-equivalent emissions using appropriate emission factors: Scope 1: Use MONRE's published national factors or IPCC default values. Scope 2: Use the latest EVN grid emission factor published by MONRE. **Scope 3: **Use sector-specific factors from the GHG Protocol databases,... or supplier-specific data where available. Step 6 - Calculate, Aggregate, and Quality-Check Sum emissions across all categories, convert to a common unit (tonnes of CO₂ equivalent, or tCO₂e), and conduct a thorough quality review. Check for double-counting between scopes and verify that emission factors have been correctly applied. Step 7 - Document and Disclose Prepare a disclosure-ready inventory report that clearly describes your organizational boundary, methodology, data sources, emission factors used, and any limitations or assumptions. This documentation is what makes your inventory auditable - a requirement for third-party verification and regulatory submission.
Common Pitfalls to Avoid
Inconsistent boundary definitions: Reporting facilities that belong to a different legal entity, or excluding leased facilities that your company fully controls. Using outdated emission factors: Vietnam's grid emission factor is updated periodically by MONRE - using a three-year-old factor can materially skew your Scope 2 figures. **Ignoring refrigerant losses: **HFC leaks from air conditioning and cold chain equipment are a significant Scope 1 source that is frequently overlooked, especially in food processing and cold storage. Treating Scope 3 as permanently optional: Many businesses defer Scope 3 measurement on the grounds that it is not yet mandatory. This is a short-term view that creates real supply chain risk as EU buyer requirements continue to tighten. Conflating reduction targets with baseline measurement: Your GHG inventory is a measurement tool, not a decarbonization plan. Accuracy in measurement is the prerequisite for meaningful target-setting.
From Measurement to Action
A completed GHG inventory is not an end in itself - it is the beginning of a strategic conversation about where emissions reductions are most feasible, most cost-effective, and most valued by the market. Once your baseline is established, it enables: Science-based target setting aligned with Vietnam's NDC commitments Identification of high-impact reduction opportunities within your operations Supplier engagement programs that progressively improve Scope 3 data quality Carbon credit participation as Vietnam's domestic market matures In 2026, the most commercially sophisticated Vietnamese companies are not just building inventories to satisfy compliance requirements. They are using GHG data as an operational intelligence tool - identifying energy inefficiencies, de-risking supply chains, and positioning themselves as preferred partners in a global economy where low-carbon credentials are increasingly a condition of doing business.
Start With What You Can Measure, and Build From There
If your organization has not yet begun GHG measurement, the most important thing to know is this: you do not need to achieve perfection in year 1. A credible Scope 1 and Scope 2 inventory, with clear documentation of methodology, is a legitimate and valuable starting point. The goal is to establish a reliable baseline, build internal data collection capability, and expand your reporting scope progressively. Is your organization ready for the 2026 reporting shift? Our advisory team specializes in helping businesses transition from GRI to IFRS, build CBAM-ready reporting systems, and design multi-framework ESG strategies for exporters and listed companies in Vietnam. Get in touch to arrange a strategic ESG assessment today. #ESG #SustainableBusiness #CorporateIntegrity #BusinessGrowth #GHGProtocol
