Scope 3 Emissions Reporting Hong Kong: Complete Guide 2026

Posted July 2026 • 8 min read

What Are Scope 3 Emissions?

Scope 3 emissions are the indirect greenhouse gas (GHG) emissions that occur in a company's value chain — both upstream (suppliers, raw materials, business travel) and downstream (product use, distribution, end-of-life disposal). They are defined by the GHG Protocol Corporate Value Chain (Scope 3) Accounting and Reporting Standard.

While Scope 1 covers direct emissions (company-owned vehicles, furnaces) and Scope 2 covers purchased electricity, Scope 3 covers everything else. For most companies, Scope 3 accounts for 70-90% of total emissions, making it the most significant but also the most challenging category to measure.

The GHG Protocol defines 15 categories of Scope 3 emissions:

• Upstream: Purchased goods & services, capital goods, fuel & energy activities, transportation & distribution, waste generated in operations, business travel, employee commuting, leased assets
• Downstream: Transportation & distribution, processing of sold products, use of sold products, end-of-life treatment, downstream leased assets, franchises, investments

Why Does HKEX Require Scope 3 Reporting?

Since January 2025, the updated HKEX ESG Reporting Guide (aligned with international ESG reporting standards) requires all Main Board listed companies to report Scope 1, 2, and 3 GHG emissions. Previously, Scope 3 was "comply or explain" — now it is mandatory.

The HKEX requirements follow the international ESG reporting standards climate disclosure standard, which mandates:

• Absolute Scope 1, 2, and 3 emissions in tonnes of CO2 equivalent
• Emission intensity metrics (e.g., per revenue, per unit produced)
• Methodology used (GHG Protocol is the default)
• Scope 3 must cover all relevant categories
• Climate-related risk assessment and scenario analysis

Companies that fail to comply risk regulatory penalties and reputational damage. Investors increasingly use Scope 3 data to assess climate risk and transition readiness.

How to Calculate Scope 3 Emissions

The GHG Protocol provides three main calculation methods:

1. Spend-Based Method

The simplest approach: multiply financial spend data by industry-average emission factors. For example, HK$1 million spent on IT services x emission factor for "computer services" = estimated emissions. This is fast but imprecise.

2. Average-Data Method

Uses physical quantities (e.g., tonnes of steel, litres of fuel) multiplied by average emission factors. More accurate than spend-based but requires procurement data.

3. Supplier-Specific Method

The most accurate method: collect actual emissions data from suppliers. Requires significant effort but produces the most reliable results. Recommended for material categories.

Challenges for Hong Kong Companies

Hong Kong companies face unique challenges with Scope 3 reporting:

• Data availability: Many suppliers in mainland China and Southeast Asia don't track or disclose emissions
• Complex value chains: HK companies often serve as trading hubs with global supply networks
• Capacity gaps: Most SMEs lack in-house ESG expertise
• Cost: Comprehensive Scope 3 assessments can cost HK$100,000+ from consultants
• Verification: Third-party verification adds further cost and complexity

Practical Solutions

Start with a materiality assessment to identify which of the 15 Scope 3 categories matter most for your company. Focus on the top 3-5 categories that represent 80%+ of emissions. Use spend-based estimates initially, then refine over time.

Consider training your team through our ESG Sustainable Solutions 4.0 course, which includes hands-on Scope 3 calculation workshops. Our instructors walk you through real-world examples using the GHG Protocol tools.

Tools and Resources

• GHG Protocol Corporate Standard — The global standard for emissions accounting
• CDP Supply Chain Program — Platform for collecting supplier emissions data
• EPA Scope 3 Evaluator — Free tool for preliminary estimates
• HKEX ESG Reporting Guide — The local regulatory framework

Learn Scope 3 Reporting Hands-On

Peak M&S Education Centre offers comprehensive ESG training covering Scope 1-3 emissions calculation, international ESG standards, and HKEX compliance. Our weekend course (HK$10,000 early bird) includes practical workshops where you calculate real emissions data.

Government GSF funding is available — eligible applicants pay as little as HK$2,000. Enrol now or for details.