Explained: The ICMA’s Climate Transition Bond Guidelines

The International Capital Market Association (ICMA) has released its Climate Transition Bond Guidelines (CTBG) – a framework designed to expedite the flow of capital towards energy-intensive sectors that are undergoing transformation.

While green bonds have traditionally been effective at channelling funding into technologies like EVs and renewables, many high-emitting sectors remain locked in older energy systems.

Heavy industries like steel, cement, chemicals and transport still account for roughly 40% of global greenhouse gas emissions, yet have historically faced barriers to accessing the sustainable bond market at scale.

By creating a dedicated Climate Transition Bond (CTB) label, ICMA is offering investors a blueprint for financing credible decarbonisation projects without diluting environmental standards.

What sets climate transition bonds apart

Unlike traditional green bonds that typically finance projects already considered sustainable, CTBs invest in the journey towards low-carbon energy systems.

They are use-of-proceeds instruments specifically targeted at energy-intensive issuers seeking to fund transformations aligned with the Paris Agreement. Among the eligible Climate Transition Projects are those that deliver measurable emissions reductions, including:

• Carbon capture and storage (CCS): Deploying carbon removal technologies for industrial and energy-generation processes

• Managed phase-outs: Retiring fossil-heavy energy assets early, such as coal-fired power plants

• Fuel switching: Transitioning from coal to gas or low-carbon fuels, with pathways to integrate renewables or green hydrogen infrastructure

• Operational efficiency: Implementing best-available technologies and methane reduction measures across existing industrial energy systems

Why the guidelines matter to the energy sector

For sustainability leaders, ICMA’s new framework turns high-level transition goals into investable, energy-aligned pathways. The guidelines embed transparency through core safeguards that every issuer must meet or disclose.

These safeguards require an issuer-level sustainability or climate transition strategy, evidence that low-carbon solutions are not yet commercially viable, and proof that the proposed projects align with recognised taxonomies and 1.5°C decarbonisation models.

ICMA stresses that projects must demonstrate emissions cuts beyond business as usual, reflecting both sector benchmarks and best practice. It does not lower standards for fossil-heavy industries – instead, it demands higher accountability.

When funding involves fossil-related infrastructure, issuers must pursue independent annual reviews, adopt forward-looking metrics, and show concrete plans for switching to renewables or zero-carbon fuels. External reviewers and third-party auditors are strongly recommended before and after issuance.

Implications for emerging energy markets

The CTBG could be especially catalytic for emerging energy economies like Mexico and Latin America. As these regions strengthen their renewable capacity and modernise industrial energy systems, the CTB label creates new avenues to integrate transition finance with local energy strategies.

Arturo Palacios, Deputy Director, Mexico and Head of Sustainable Finance, Latin America at The Carbon Trust, notes that the main challenge lies in “the technical capacity to produce entity level transition plans, adopt sectoral pathways and implement robust measurement, reporting and verification.”

“Regulation is only one part of the equation,” Arturo says. “What determines outcomes is how the transition is designed and delivered.

“In Mexico, Climate Transition Bonds can align with national priorities, such as industrial development, energy security and social inclusion, by framing transition finance as modernisation that protects jobs and competitiveness.”

For organisations in these regions, the next steps include:

• Developing entity-level transition plans with interim energy and emissions targets

• Using national taxonomies to identify energy-related eligible activities

• Delivering annual impact reports combining qualitative and quantitative results

Climate Transition Bonds can give investors the confidence to finance the “heavy lifting” of global energy transformation.

“The bottom line is straightforward,” Arturo writes. “The potential mainstreaming of Climate Transition Bonds may be arriving late in the global debate, but if it happens, it may be on time for Mexico and Latin America.

“At a series of Climate Transition Bonds training sessions delivered recently by Carbon Trust Mexico, we saw that there is interest from companies to explore this type of issuance.

“They do not replace green bonds or sustainability-linked bonds; however, they complete the toolkit by ordering the financing of industrial transition under guardrails investors can trust.”