Scope 1, 2, and 3 Carbon Reporting: What Malaysian Companies Need to Know in 2025

Carbon reporting transformed from voluntary best practice to regulatory requirement virtually overnight for Malaysian companies. Bursa Malaysia listed companies must now disclose greenhouse gas emissions across all three scopes, with particular scrutiny on material Scope 3 categories. The problem? Most companies lack basic understanding of what Scope 1, 2, and 3 actually mean, let alone how to measure them.

This isn't theoretical environmental science—it's practical business compliance affecting contract eligibility, investor relations, and regulatory standing. Companies need implementable systems, not academic carbon accounting courses. This guide provides exactly that: clear definitions, Malaysian-specific calculation methods, realistic implementation approaches, and honest assessment of where companies should invest resources for maximum compliance value.

Understanding Scope 1, 2, and 3 Emissions: The Fundamentals

The Greenhouse Gas Protocol establishes the global standard for carbon accounting, categorizing emissions into three scopes based on operational control and value chain position.

Scope 1: Direct Emissions

Scope 1 emissions are greenhouse gases released directly from sources your company owns or controls. This includes combustion in company-owned vehicles, onsite fuel burning for heating or manufacturing processes, fugitive emissions from refrigeration and air conditioning systems, and process emissions from chemical reactions in manufacturing.

For most Malaysian companies, Scope 1 emissions primarily come from diesel or petrol combustion in company vehicles, natural gas use in manufacturing or building heating, backup generator operation during power outages, and refrigerant leakage from cooling systems.

Scope 1 is typically the easiest to measure since companies have direct control over fuel purchases and consumption. Data comes from fuel receipts, meter readings, and maintenance records.

Scope 2: Indirect Emissions from Purchased Energy

Scope 2 emissions are greenhouse gases released during generation of purchased electricity, steam, heating, or cooling consumed by your operations. These emissions occur at power plants or district heating facilities, not at your company location, but are attributed to your company because you purchase and consume the energy.

For Malaysian companies, Scope 2 almost exclusively means electricity purchased from Tenaga Nasional Berhad or other utility providers. The emissions occur at coal, gas, or hydro plants generating your electricity, but you're responsible for reporting them because you drive demand through consumption.

Scope 2 is straightforward to measure using electricity bills and published grid emission factors from TNB. This makes it the second-easiest scope to implement after Scope 1.

Scope 3: All Other Indirect Emissions

Scope 3 emissions include all indirect emissions in your value chain not covered by Scope 2. The Greenhouse Gas Protocol identifies 15 categories spanning upstream suppliers to downstream customers, including purchased goods and services, capital goods, fuel and energy related activities, transportation and distribution, waste, business travel, employee commuting, leased assets, processing of sold products, use of sold products, end-of-life treatment of sold products, franchises, investments, and other indirect emissions.

Not all categories apply to every company. A software company won't have "use of sold products" emissions, while a car manufacturer will. Materiality assessment determines which Scope 3 categories matter for your business.

Scope 3 is vastly more complex than Scope 1 and 2, often representing 70-90 percent of total carbon footprint while requiring data from external parties who may not track or share emissions information. This creates the primary carbon reporting challenge for Malaysian companies.

Bursa Malaysia Carbon Reporting Requirements in 2025

Bursa Malaysia's Enhanced Sustainability Reporting Framework progressively increased carbon disclosure requirements, with 2024-2025 marking significant expansion.

Current Mandatory Requirements

All Bursa Malaysia Main Market listed companies must disclose Scope 1 and Scope 2 emissions annually in their sustainability statements. This includes total annual emissions in tonnes of CO2 equivalent, emissions intensity metrics relevant to the business, and year-over-year trend data showing performance changes.

For Scope 3 emissions, companies must disclose material categories based on their specific value chain and impacts. While comprehensive 15-category Scope 3 reporting isn't mandatory for all companies, material categories must be identified, measured, and reported with justification for materiality determination.

What "Material" Scope 3 Means in Practice

Materiality for Scope 3 considers both magnitude of emissions and influence over the emission source. A category is likely material if it represents more than 10 percent of total Scope 1, 2, and 3 emissions combined, involves significant financial expenditure, faces regulatory attention or investor scrutiny, or presents opportunities for emission reduction impact.

For example, purchased goods and services is material for virtually all companies—it's the largest Scope 3 category for most organizations. Employee commuting may not be material for a 20-person office but absolutely is for a 5,000-employee manufacturing operation. Use of sold products matters tremendously for automotive or appliance manufacturers but not for business consultants.

Reporting Timeline and Expectations

Companies should include carbon data in their annual sustainability statements published alongside financial reports. First-time reporters receive some regulatory grace for data quality and scope coverage, but improvement year-over-year is expected. Bursa Malaysia encourages progressive Scope 3 expansion rather than perfect comprehensive reporting immediately.

That said, "first-year leniency" expires quickly. Companies starting carbon reporting in 2025 should implement robust systems capable of multi-year tracking and continuous improvement rather than treating initial disclosure as one-time compliance exercise.

Calculating Scope 1 Emissions: Practical Implementation

Scope 1 calculation follows straightforward methodology: identify emission sources, collect activity data, apply appropriate emission factors, and sum results. The devil lives in systematic data collection and emission factor selection.

Identify Your Scope 1 Sources

Start by cataloging all direct emission sources your company owns or controls. Common sources for Malaysian companies include company vehicles burning diesel or petrol, forklifts or other equipment using liquefied petroleum gas, backup diesel generators, natural gas for process heating or boilers, refrigerants in air conditioning systems, and process emissions from manufacturing if applicable.

Create a complete inventory before attempting measurement. Missing sources undermines data accuracy and creates gaps requiring explanation in reports.

Collect Activity Data

Activity data means fuel consumption or refrigerant usage quantities. For vehicles and equipment, collect monthly fuel purchase records from petrol cards or accounting systems. For stationary combustion, gather natural gas or LPG meter readings. For refrigerants, track quantities added during maintenance and servicing.

Most companies already collect this data for expense tracking—carbon reporting simply requires organizing it by emission source category.

Apply Emission Factors

Emission factors convert activity data into CO2 equivalent emissions. Malaysian companies typically use factors from the Intergovernmental Panel on Climate Change (IPCC), UK Department for Environment, Food & Rural Affairs (DEFRA), or local sources when available.

Common Malaysian Emission Factors for 2025:

Diesel: 2.68 kg CO2e per liter
Petrol: 2.31 kg CO2e per liter
Natural Gas: 56.1 kg CO2e per GJ (gigajoule)
LPG: 3.00 kg CO2e per kg
R-410A Refrigerant: 2,088 kg CO2e per kg

These factors include both CO2 and other greenhouse gases (methane, nitrous oxide) expressed as CO2 equivalent using global warming potential values.

Calculate and Sum Emissions

Multiply activity data by emission factors to get emissions per source. For example, if your company consumed 5,000 liters of diesel in 2025, multiply 5,000 liters by 2.68 kg CO2e per liter equals 13,400 kg CO2e or 13.4 tonnes CO2e.

Sum all Scope 1 sources for total annual Scope 1 emissions. This becomes your disclosure figure.

Calculating Scope 2 Emissions: Malaysian Grid Factors

Scope 2 calculation is even simpler than Scope 1 for most Malaysian companies since it typically involves only purchased electricity.

Gather Electricity Consumption Data

Collect monthly electricity bills for all your company locations. You need kilowatt-hour (kWh) consumption figures, which appear on every TNB or Sabah Electricity bill.

If your company has multiple locations, sum consumption across all sites for organization-wide reporting, or break down by facility if location-specific reporting is required.

Apply Malaysian Grid Emission Factor

Tenaga Nasional Berhad publishes grid emission factors annually based on the generation mix of coal, natural gas, hydro, and renewable sources feeding Malaysia's electricity grid.

For Peninsular Malaysia in 2025, the grid emission factor is approximately 0.574 kg CO2e per kWh. This represents the average carbon intensity of electricity from the Malaysian grid.

Companies in Sabah or Sarawak should use region-specific factors as these states have separate grids with different generation mixes.

Calculate Scope 2 Emissions

Multiply annual electricity consumption by the grid emission factor. If your company consumed 500,000 kWh in 2025, multiply 500,000 kWh by 0.574 kg CO2e per kWh equals 287,000 kg CO2e or 287 tonnes CO2e.

This becomes your Scope 2 disclosure.

Location-Based vs. Market-Based Scope 2

Advanced carbon reporting distinguishes between location-based Scope 2 (using average grid factors as described above) and market-based Scope 2 (using emission factors specific to your electricity contract, particularly relevant if you purchase renewable energy).

Malaysian companies starting carbon reporting should use location-based methodology as it's simpler and requires only grid emission factors. Companies with renewable energy contracts can explore market-based accounting later to demonstrate renewable energy impact.

The Scope 3 Challenge: Why It's Complex and How to Start

Scope 3 represents the frontier of carbon reporting—simultaneously the most significant emission source and the most challenging to measure. Understanding why Scope 3 is difficult helps companies develop realistic implementation strategies.

Why Scope 3 Is Challenging

Data Availability: Scope 3 requires information from suppliers, logistics providers, waste contractors, and customers who may not track carbon data. Many suppliers lack carbon accounting capabilities, particularly SMEs in developing markets.

Scope and Complexity: With 15 potential categories spanning your entire value chain, comprehensive Scope 3 assessment involves hundreds or thousands of emission sources. Even determining which categories apply requires significant analysis.

Estimation Methods: When primary data from suppliers is unavailable, companies must use estimation methodologies based on spend data and industry averages. These estimates carry uncertainty but are better than no reporting.

Continuous Evolution: As suppliers improve their carbon tracking, your Scope 3 data quality improves, requiring continuous system updates rather than one-time implementation.

Material Scope 3 Categories for Malaysian Companies

Rather than attempting all 15 categories immediately, focus on material categories where your company has meaningful impact:

Category 1: Purchased Goods and Services — Material for virtually every company. Includes emissions from production of purchased materials, components, and services. Often the largest Scope 3 category.

Category 3: Fuel and Energy Related Activities — Emissions from extraction, production, and transportation of fuels and electricity consumed by your company (not included in Scope 1 or 2). Automatically material if you have significant energy consumption.

Category 4: Upstream Transportation and Distribution — Emissions from transporting purchased goods to your facilities. Material for companies with significant inbound logistics.

Category 5: Waste Generated in Operations — Emissions from disposal and treatment of waste. Material for companies generating significant waste volumes.

Category 6: Business Travel — Emissions from employee air travel, hotel stays, and rental vehicles. Material for service companies and organizations with dispersed operations.

Category 7: Employee Commuting — Emissions from employee transportation to and from work. Material for companies with large workforces.

Category 9: Downstream Transportation and Distribution — Emissions from transporting sold products to customers. Material for manufacturers and distributors.

Category 11: Use of Sold Products — Emissions from customer use of your products. Material for energy-consuming product manufacturers like appliances, vehicles, or electronics.

Practical Scope 3 Implementation Strategy

Companies should implement Scope 3 reporting in phases rather than attempting comprehensive coverage immediately.

Phase 1 (Year 1): Calculate spend-based estimates for Category 1 (Purchased Goods and Services) and measure directly controllable categories like business travel and employee commuting using expense data and distance calculations.

Phase 2 (Year 2): Engage top suppliers representing 80 percent of procurement spend to request their Scope 1 and 2 emissions data. Calculate upstream and downstream transportation based on logistics provider data or distance and weight calculations.

Phase 3 (Year 3+): Expand supplier engagement to mid-tier suppliers, refine estimation methodologies based on industry-specific factors, and add additional material categories like use of sold products if applicable.

This phased approach allows companies to comply with reporting requirements while progressively improving data quality and scope coverage.

Carbon Reporting Implementation: Step-by-Step Process

Moving from concept to operational carbon reporting requires systematic implementation across data collection, calculation, and reporting systems.

Step 1: Establish Organizational Boundaries

Decide which legal entities, subsidiaries, and operations to include in carbon reporting. Most companies use the same organizational boundary as financial reporting for consistency. Document your boundary decision clearly as it affects data collection scope.

Step 2: Conduct Comprehensive Source Inventory

Create detailed inventory of all Scope 1, 2, and potentially material Scope 3 emission sources. This inventory becomes the foundation for data collection and calculation systems. Don't skip this step—incomplete inventories create reporting gaps discovered too late.

Step 3: Design Data Collection Systems

Establish processes for gathering activity data from relevant sources. For Scope 1 and 2, this often means extracting data from existing accounting and facilities management systems. For Scope 3, you'll need supplier questionnaires, travel booking system integration, and waste contractor reporting.

Automate data collection wherever possible. Manual data gathering is error-prone and doesn't scale.

Step 4: Select Emission Factors and Calculation Tools

Document which emission factor databases you'll use (IPCC, DEFRA, local factors) and create calculation spreadsheets or select carbon accounting software. Consistency in emission factors across years matters for trend reporting, so document your methodological choices.

Step 5: Calculate Baseline Year Emissions

Perform calculations for your baseline year (typically the earliest year with reliable data). This baseline enables future year-over-year comparison and target setting.

Step 6: Establish Quality Assurance Procedures

Carbon data undergoes same rigor as financial data since it appears in public disclosures. Implement internal verification procedures checking calculation accuracy, data completeness, and methodological consistency before external assurance or publication.

Step 7: Set Reduction Targets

Once you understand your carbon footprint, set credible reduction targets. Targets should be ambitious enough to demonstrate commitment while realistic enough to achieve. Many Malaysian companies set 5-year targets like 10-15 percent reduction in Scope 1 and 2 emissions intensity.

Step 8: Integrate into ESG Reporting

Carbon data feeds into broader ESG reporting through sustainability statements, ESG reports, and CDP disclosures. Integrate carbon reporting systems with your overall ESG consultancy framework rather than treating it as standalone exercise.

Integrating Carbon Reporting with Environmental Management Systems

Companies with existing environmental certifications already have foundations for carbon reporting. Leveraging these systems accelerates implementation and reduces duplication.

ISO 14001 Integration

ISO 14001 certified companies already monitor significant environmental aspects, which typically include energy consumption and waste generation. These monitoring systems provide activity data for carbon calculations.

ISO 14001's management review, internal audit, and continual improvement mechanisms extend naturally to carbon management. Companies can integrate carbon KPIs into existing environmental objectives and targets.

Energy Management Systems

Organizations implementing ISO 50001 energy management track detailed energy consumption data essential for Scope 1 and 2 carbon accounting. Energy efficiency projects simultaneously reduce costs and carbon emissions, providing dual ROI.

Environmental Accounting Integration

Some progressive Malaysian companies integrate carbon accounting with financial environmental accounting, tracking both monetary costs and carbon costs of operational decisions. This creates carbon-aware decision making in procurement, logistics, and product design.

Supplier Engagement for Scope 3 Reporting

Effective Scope 3 reporting requires systematic supplier engagement since Category 1 (Purchased Goods and Services) represents the largest emission source for most companies.

Supplier Engagement Strategy

Begin with top-tier suppliers representing the majority of procurement spend. A Pareto approach focusing on suppliers covering 80 percent of spend yields 80 percent of Scope 3 emissions with 20 percent of engagement effort.

Develop simple supplier questionnaires requesting Scope 1 and Scope 2 emissions data, or at minimum energy consumption and production volumes allowing you to calculate emission intensity. Don't overwhelm suppliers with complex requests—start simple and build sophistication over time.

For suppliers unable to provide carbon data, use spend-based estimation multiplying procurement value by sector-specific emission intensity factors. While less accurate than primary data, spend-based estimates satisfy initial reporting requirements and identify high-emission categories for focused supplier engagement.

Building Supplier Capacity

Many Malaysian SME suppliers lack carbon accounting capabilities. Leading companies help suppliers develop these capabilities through training, tools provision, and technical support. This investment improves long-term data quality while strengthening supplier relationships.

Consider including ESG requirements in supplier contracts, making carbon data provision a contractual obligation for major suppliers. This formalizes expectations and improves response rates.

Common Carbon Reporting Challenges for Malaysian Companies

Understanding typical obstacles helps companies prepare appropriate solutions.

Challenge 1: Data Gaps and Quality

Incomplete historical data, particularly for Scope 1 sources like refrigerant leakage or distributed operations, creates reporting gaps. Solution: Document data limitations transparently, use conservative estimates where primary data is unavailable, and implement prospective tracking systems ensuring future years have complete data.

Challenge 2: Resource Constraints

Carbon reporting requires dedicated resources most companies haven't budgeted. Solution: Start with minimum viable reporting covering Scope 1, 2, and 1-2 material Scope 3 categories. Expand coverage progressively as resources allow rather than attempting comprehensive reporting immediately.

Challenge 3: Methodology Confusion

Multiple emission factor databases and calculation methodologies create confusion. Solution: Select one primary emission factor source (typically DEFRA or IPCC for international consistency) and document your choices in a methodology statement accompanying disclosures.

Challenge 4: Scope 3 Supplier Responsiveness

Suppliers don't respond to carbon data requests, particularly international suppliers with numerous customers making similar requests. Solution: Combine persistent engagement with spend-based estimation for non-responsive suppliers. Prioritize supplier engagement on highest-spend, highest-emission suppliers where effort yields greatest data quality improvement.

Challenge 5: Year-Over-Year Comparability

Business changes like acquisitions, divestitures, or operational expansions affect carbon footprint, complicating year-over-year comparison. Solution: Recalculate baseline year emissions to reflect current organizational boundaries when significant changes occur, and disclose all adjustments transparently.

Getting Started: Your Carbon Reporting Roadmap

Companies beginning carbon reporting should follow this practical roadmap:

Months 1-2: Foundation

• Establish organizational boundary for reporting
• Conduct comprehensive Scope 1 and 2 source inventory
• Identify material Scope 3 categories through preliminary assessment
• Assign carbon reporting responsibilities to appropriate staff
• Select emission factor databases and establish calculation methodology

Months 3-4: Data Collection

• Gather historical activity data for Scope 1 and 2 from last 1-2 years
• Extract travel and commuting data for relevant Scope 3 categories
• Develop supplier engagement questionnaire and send to top 20 suppliers
• Document data gaps and limitations for disclosure

Months 5-6: Calculation and Verification

• Perform carbon calculations for all scopes and categories
• Conduct internal verification reviewing calculation accuracy
• Calculate emission intensity metrics relevant to your industry
• Set preliminary reduction targets based on baseline understanding

Months 7-9: Reporting and Integration

• Prepare carbon disclosure sections for sustainability statement
• Integrate carbon data into broader ESG reporting
• Develop reduction initiative roadmap addressing major emission sources
• Establish ongoing tracking systems for continuous data collection

This nine-month timeline assumes part-time dedication from appropriate staff and phased implementation prioritizing Scope 1, 2, and limited Scope 3. Companies with existing environmental systems or engaging consultants can compress timelines to 4-6 months.

Professional Support Considerations

Many companies benefit from professional carbon accounting support, particularly for initial system setup and methodology development. Our ESG consultancy services include comprehensive carbon reporting implementation covering all three scopes, supplier engagement programs, calculation tool development, and verification support.

Consider professional support when you face tight regulatory deadlines requiring rapid implementation, lack internal environmental or sustainability expertise, need assurance-ready carbon data for investor or lender requirements, want to integrate carbon reporting with broader ESG systems like GRI frameworks, or require supplier engagement programs for Scope 3 data collection.

Frequently Asked Questions