Carbon Emission Allowance Impact Assessment for IPO Applicants

Hong Kong’s climate disclosure regime shifted from voluntary guidance to mandatory compliance on 1 January 2025, when the HKEX’s enhanced climate-related disclosure requirements under Appendix 27 of the Main Board Listing Rules took effect. For IPO applicants filing a prospectus after that date, the carbon emission allowance — the cap on permissible emissions under regional or sectoral carbon trading schemes — is no longer a peripheral ESG talking point but a direct input into the financial model, risk factor disclosure, and sponsor due diligence. The HKEX’s 2024 consultation conclusions (HKEX, October 2024) confirmed that issuers must disclose Scope 1, 2, and 3 emissions for the current and two preceding financial years, and where a carbon price is applied internally or externally, the methodology and assumptions underpinning that price must be stated. For companies operating in jurisdictions with active carbon markets — the EU ETS at EUR 80.50 per tonne as of 31 March 2025, China’s national ETS at RMB 68.40 per tonne, or South Korea’s K-ETS at KRW 12,300 per tonne — the allowance cost directly affects cost of goods sold, capital expenditure budgets, and projected compliance liabilities. This article examines how IPO applicants should assess carbon emission allowance exposure, integrate it into the prospectus financial disclosures, and structure sponsor engagement to avoid material omission risks under the Securities and Futures Ordinance (Cap. 571).

The Regulatory Framework for Carbon Allowance Disclosure

HKEX Listing Rules Appendix 27 and Climate-Related Disclosures

The HKEX’s enhanced climate disclosure requirements, effective for all Main Board and GEM listing documents submitted on or after 1 January 2025, mandate that an IPO applicant disclose its climate-related risks and opportunities, including those arising from carbon pricing mechanisms. Appendix 27, paragraph 4, requires the issuer to describe how it identifies, assesses, and manages climate-related risks, with specific reference to transition risks such as policy and legal changes — carbon taxes and emission trading schemes fall squarely within this category. The issuer must also disclose the metrics and targets used to assess and manage these risks, including, where applicable, the internal carbon price per tonne of CO2 equivalent (tCO2e) and the methodology for setting that price. For an IPO applicant that does not currently apply an internal carbon price, the HKEX expects an explanation of why, and a statement on whether the board has considered adopting one.

SFC’s Position on Materiality and Carbon Exposure

The Securities and Futures Commission (SFC) has not issued a standalone code on carbon allowance disclosure, but its 2023 circular on climate-related disclosures for fund managers (SFC, August 2023) established the principle that climate risk is a material financial risk for asset managers. By extension, for an IPO applicant, the SFC’s position under the Code of Conduct for Persons Licensed by or Registered with the SFC (paragraph 16.1) requires that a prospectus contain all information that is necessary to enable a reasonable investor to make an informed assessment of the issuer’s financial condition and prospects. Where carbon allowance costs constitute a material input — typically defined as more than 5 percent of cost of sales or 10 percent of operating expenses — omission of that exposure could constitute a breach of Section 384 of the Securities and Futures Ordinance (Cap. 571), which prohibits false or misleading statements in a prospectus.

Quantifying Carbon Allowance Exposure in the Prospectus

Scope 1, 2, and 3 Emissions and Allowance Mapping

The first step in assessing carbon allowance exposure is to map the issuer’s greenhouse gas (GHG) emissions against the carbon pricing mechanisms that apply to its operations. For an IPO applicant with manufacturing facilities in the PRC, the China national ETS currently covers the power generation sector only, but the Ministry of Ecology and Environment (MEE) announced in its 2024 work plan that the cement, electrolytic aluminium, and steel sectors will be included by the end of 2025. An issuer in these sectors must estimate its allowance allocation under the MEE’s free allocation methodology, which for 2025 is benchmark-based at a rate of 0.85 tCO2e per tonne of clinker for cement, and then calculate the shortfall or surplus at the prevailing market price of RMB 68.40 per tonne. For issuers with European operations, the EU ETS Phase IV (2021–2030) applies a declining cap of 2.2 percent per year, with free allocation phased out entirely for aviation by 2026 and for most industrial sectors by 2034. The EU ETS allowance price has traded between EUR 55 and EUR 100 per tonne in 2024, and an issuer with 100,000 tCO2e of covered emissions would face a compliance cost of between EUR 5.5 million and EUR 10.0 million per year.

Financial Model Integration and Sensitivity Analysis

Once the emissions are mapped, the carbon allowance cost must be integrated into the issuer’s financial projections. The HKEX’s guidance on forward-looking information in listing documents (HKEX, 2023) requires that any projections be based on reasonable assumptions and clearly stated. For carbon allowance exposure, the issuer should present a base case using the current market price of the relevant allowance and a sensitivity analysis showing the impact of a 20 percent increase and a 20 percent decrease in the allowance price. For example, an issuer with 500,000 tCO2e of covered emissions under the China ETS would show a base-case cost of RMB 34.2 million (500,000 × RMB 68.40), a high-case cost of RMB 41.0 million, and a low-case cost of RMB 27.4 million. This sensitivity analysis should be presented in the “Risk Factors” section of the prospectus and cross-referenced in the “Summary of Financial Information” and “Business” sections.

Sponsor Due Diligence and Verification Requirements

Engagement of Third-Party Verifiers

The HKEX’s enhanced climate disclosure rules require that Scope 1 and Scope 2 emissions be verified by an independent third party in accordance with ISO 14064-3 or equivalent standards. For an IPO applicant, the sponsor must confirm in its due diligence report that the verification has been completed and that the emissions data is reliable. The verification process typically takes 8 to 12 weeks and should be initiated no later than the start of the due diligence phase. The sponsor should also review the issuer’s methodology for allocating emissions to specific products or business segments, as this allocation directly affects the carbon allowance cost per unit of output. For a multi-facility issuer, the sponsor must ensure that the verification covers all material facilities, defined as those contributing more than 5 percent of total emissions.

Materiality Assessment and Disclosure of Allowance Risk

The sponsor’s due diligence must include a materiality assessment of carbon allowance exposure under the SFC’s Code of Conduct. The sponsor should prepare a memorandum that identifies each jurisdiction where the issuer operates, the applicable carbon pricing mechanism, the covered emissions, and the estimated compliance cost as a percentage of revenue and EBITDA. Where the compliance cost exceeds 5 percent of EBITDA in any of the three most recent financial years, the sponsor must recommend that the issuer include a specific risk factor in the prospectus. The sponsor should also assess the issuer’s strategy for managing allowance price volatility, including whether the issuer has purchased forward allowances or carbon offsets, and whether it has entered into any allowance hedging arrangements. The HKEX’s 2024 consultation conclusions noted that the exchange expects sponsors to treat carbon allowance exposure as a material financial risk, not merely an environmental disclosure.

Sector-Specific Considerations

High-Emissions Sectors: Power, Cement, Steel, Aviation

IPO applicants in high-emissions sectors face the most immediate and material carbon allowance exposure. For a Main Board applicant in the PRC cement sector, the MEE’s 2025 inclusion of cement in the national ETS means that the issuer must disclose its allowance allocation, the benchmark emission factor, and the estimated compliance cost for the next three financial years. The issuer should also disclose the impact of the declining cap on free allocation, which the MEE has indicated will decrease by 1.5 percent per year from 2026. For an aviation sector applicant, the EU ETS and the Carbon Offsetting and Reduction Scheme for International Aviation (CORSIA) impose overlapping compliance obligations. CORSIA requires airlines to offset emissions growth above 2019 levels, with the offset price currently ranging between USD 5 and USD 15 per tCO2e. An issuer with a fleet of 50 aircraft and annual emissions of 1.5 million tCO2e would face offset costs of between USD 7.5 million and USD 22.5 million per year under CORSIA, in addition to EU ETS allowance costs for intra-European flights.

Low-Emissions Sectors: Technology, Financial Services, Real Estate

For IPO applicants in low-emissions sectors, carbon allowance exposure is typically indirect, arising from purchased electricity (Scope 2) or supply chain emissions (Scope 3). The HKEX’s disclosure rules require that Scope 3 emissions be disclosed where material, and for a technology company with a large data centre footprint, the electricity consumption and associated carbon allowance cost in the jurisdiction where the data centre is located must be disclosed. For a financial services applicant, the SFC’s 2023 circular on climate-related disclosures for fund managers applies, and the issuer must disclose the carbon footprint of its investment portfolio, including the weighted average carbon intensity (WACI) and the total carbon emissions attributable to the portfolio. While the financial services issuer does not directly purchase carbon allowances, the exposure arises from the portfolio companies’ compliance costs, which affect portfolio valuation and credit risk.

Actionable Takeaways

1. Initiate third-party verification of Scope 1 and Scope 2 emissions at least 12 months before the expected listing date, as the verification process under ISO 14064-3 typically requires 8 to 12 weeks and must cover all material facilities contributing more than 5 percent of total emissions.
2. Integrate carbon allowance cost into the financial model using the prevailing market price of the relevant ETS allowance as the base case, and present a sensitivity analysis showing the impact of a 20 percent price increase and decrease on EBITDA and net profit.
3. Prepare a sponsor due diligence memorandum that maps carbon allowance exposure by jurisdiction, calculates compliance cost as a percentage of revenue and EBITDA, and identifies any allowance hedging or offset arrangements.
4. Disclose the internal carbon price, if adopted, in the prospectus risk factors section, including the methodology and assumptions, or provide an explanation of why no internal carbon price has been set.
5. For issuers in sectors newly included in the China national ETS (cement, electrolytic aluminium, steel) or subject to the EU ETS declining cap, include a specific risk factor on the impact of allowance allocation reduction and price volatility on future financial performance.