Most industrial companies in Southeast Asia know Scope 3 is coming. The harder question is where to begin. Scope 3 emissions, the indirect emissions that occur across a company’s full value chain, from suppliers to end customers, are now central to climate disclosure requirements across the region. SGX RegCo, HKEX, and Bursa Malaysia are all tightening expectations, and for companies within the reporting boundary of a CSRD-reporting entity or meeting applicable thresholds, EU obligations extend to their regional operations regardless of listing location. For most industrial operators, whether manufacturers, oil and gas companies, chemical facilities, logistics providers, or terminal operators, the challenge is not awareness. It is knowing how to approach the work in a way that is practical, defensible, and proportionate to their actual emissions profile. A Scope 3 materiality assessment is where that work begins.
What Is a Scope 3 Materiality Assessment?
The GHG Protocol divides Scope 3 emissions into 15 categories spanning upstream and downstream activities. Upstream categories include purchased goods and services, capital goods, fuel and energy-related activities, upstream transportation and distribution, and business travel. Downstream categories cover the use and end-of-life treatment of sold products, downstream transportation, and investments.
Not all 15 categories are equally significant for every business. For a manufacturer in Malaysia or Indonesia, Category 1, purchased goods and services, often represents one of the largest Scope 3 categories, since raw material inputs and third-party processing typically account for the largest share of value chain emissions. For a logistics or terminal storage operator, upstream transportation, fuel and energy-related activities, and leased assets may carry more weight. For companies with significant operations involving business travel and regional freight movement, Categories 6 and 4, business travel and upstream transportation, are often among the most accessible starting points, because the underlying activity data already exists in finance and procurement systems.
A Scope 3 materiality assessment identifies which categories are significant from both an emissions impact perspective and a financial and regulatory relevance perspective. It is important to distinguish this from the CSRD double materiality assessment. While there is overlap, they are not the same exercise. A Scope 3 materiality assessment focuses on identifying the most significant Scope 3 categories based on factors such as emissions magnitude, business relevance, stakeholder interest, and regulatory expectations. CSRD’s double materiality assessment evaluates both the company’s impacts on people and the environment (impact materiality) and how sustainability-related issues create financial risks and opportunities for the business (financial materiality). The output of a Scope 3 materiality assessment is a prioritised shortlist of categories that form the foundation for measurement. It is not an attempt to quantify all 15 categories at once.
This is the right place to start. Attempting detailed quantification of all potentially relevant Scope 3 categories without first establishing materiality is costly, data-intensive, and unlikely to produce results that are credible or useful. A materiality-first approach ensures effort is directed where it matters and gives the company a structured basis for disclosure that will hold up to scrutiny.
How ESC’s Sustainability Consultants Approach Scope 3 Programmes
ESC’s sustainability consultants help industrial clients make Scope 3 more manageable by building structured programmes that strengthen internal capability over time.
That starts with understanding the client’s operations, mapping emissions-generating activities across the value chain, and identifying which of the 15 GHG Protocol categories are genuinely material to their business. From there, ESC develops the methodology and tools the client needs to measure those categories consistently, aligned to the relevant reporting standard, whether that is the GHG Protocol, IFRS S2, CSRD/ESRS, or exchange-specific listing requirements.
Equally important is leaving the client equipped to run the process themselves. In practice, that means clear documentation of assumptions, practical guidance on data collection, and where needed, direct engagement with internal procurement and operations teams, so the capability to report stays within the business, not dependent on an external consultant each cycle.
Across these engagements, ESC has supported industrial clients across the region on a range of sustainability and decarbonisation programmes, from Scope 3 materiality assessments and carbon footprint reporting to supply chain carbon management, LCA, and net-zero strategy.
The Data Challenge for Industrial Operators in Southeast Asia
One of the most consistent challenges ESC’s ESG consultants encounter with industrial clients in the region is the availability and quality of supply chain data. Category 1 for purchased goods and services is typically the most material category for manufacturers, but it is also the most data-intensive. Suppliers across Southeast Asia often have limited emissions reporting infrastructure, which means companies frequently begin with spend-based or activity-based estimation using published emission factors as an interim approach, building toward supplier-specific primary data as the preferred long-term solution.
ESC’s measurement frameworks are designed to accommodate this progression. The methodology at each stage is documented explicitly, including the estimation approach used and the pathway toward higher-quality data, so that when Scope 3 disclosures are subject to external assurance, the numbers are backed by a transparent, auditable process rather than a figure without context.
There is also a multi-country complexity that industrial operators in the region regularly face. Companies running operations in Southeast Asia specifically in Singapore, Malaysia, and Indonesia need to navigate different reporting timelines, exchange-specific requirements, and in some cases parent company obligations under CSRD, all simultaneously. Working with an ESG consultant who understands how these frameworks interact, and who has local teams embedded across each country, reduces the risk of inconsistent approaches across a regional business.
Starting Is the Hard Part
The distance between knowing Scope 3 matters and having a structured, credible programme in place is significant. For industrial companies with complex supply chains and limited internal sustainability capacity, it often feels larger than it is.
The right first step is not a full emissions inventory. It is a clear, methodology-sound assessment of which Scope 3 categories are material to your business, followed by a framework that lets you measure them consistently. That foundation supports everything that follows: target-setting, supplier engagement, public disclosure, and assurance.
ESC’s sustainability consultants have delivered Scope 3 materiality assessments and carbon management programmes for industrial clients across Asia Pacific, spanning manufacturing, oil & gas, chemical processing, and terminal storage operations.
If your business is working out how to approach Scope 3 reporting, talk to ESC’s Sustainability and Climate team. Learn more about our Sustainability & Climate Change services or get in touch directly to discuss your programme.