By FA Michael Chomba, Practice Lead, Sustainable Finance & ESG Advisory, Grant Thornton Advisory East Africa Limited
East Africa's financial institutions are entering a decisive window. In Kenya, where the region's largest banking sector sits, the Central Bank of Kenya's Green Finance Taxonomy and Climate Risk Disclosure Framework are moving from transition into expected mandatory application around October 2026. The shift they represent, however, is not confined to Kenya — it is the most visible marker of a much larger regional reckoning.
Banks, insurers, and asset managers across Kenya, Uganda, Tanzania, and Rwanda are being asked, almost simultaneously, to prove their green claims are measurable, their climate risk is quantified, and their capital allocation can withstand supervisory and investor scrutiny.
The temptation in moments like this is to treat compliance as a checklist: adopt a template, tick the boxes, and move on. But a taxonomy or a disclosure framework is only as reliable as the governance and risk data feeding it. Get that sequencing wrong, and institutions often find themselves revisiting the same ground eighteen months later, once a regulator or investor asks the numbers to hold up under scrutiny. Treating this as an architecture problem — where each layer is deliberately built to support the one above it — tends to age better.
Why layers, not lists
Global and regional frameworks in this space can look like a crowded, competing landscape — prudential risk guidance, international risk management standards, carbon and nature-risk accounting methodologies, green and sustainability-linked instrument standards, and now Kenya's own Green Finance Taxonomy and Climate Risk Disclosure Frameworks.
Mapped carefully, though, a pattern emerges. These frameworks are not competitors; they are layers. Each answers a different question, and each depends on the one beneath it.
At the foundation sits governance: a board that sets genuine risk appetite for climate and nature exposure, and a management structure that operationalises it through defined risk thresholds — not a committee that reports upward quarterly. Above that sits risk quantification: the technical work of turning exposure into numbers a credit committee can price against.
Above that sit product and instrument standards, which turn quantified risk into bankable green lending. Above that is the local regulatory and taxonomy layer — in our region, an uneven patchwork across four jurisdictions that has yet to harmonise cleanly. At the top sits alignment with global disclosure and policy standards, the language international investors and development finance institutions now expect as a condition of capital deployment.
Two failure modes are common. The mistake we see most often is institutions building top-down — adopting an IFRS S1/S2 disclosure template because a global framework is moving to require it, without the Layer 1 and Layer 2 foundations to make the disclosed numbers defensible. The other mistake is building bottom-up in isolation — strong local taxonomy compliance with no line of sight to how it will read to an international investor or rating agency. A layered architecture is designed to prevent both.
None of this is straightforward in practice. Data quality, portfolio granularity, and scarce technical capacity are real constraints that no amount of architectural clarity removes on its own. But institutions that get the sequencing right tend to spend less time redoing each layer as regulatory and investor expectations continue to evolve.
What regional divergence looks like
The friction is jurisdictional, not just conceptual. Any banking group headquartered in Nairobi with subsidiaries elsewhere in the East Africa Community has to satisfy Kenyan requirements and, at the same time, whatever Uganda, Tanzania, and Rwanda's supervisors expect — and those expectations are still at different stages of maturity, from Rwanda's own established green taxonomy and Uganda's National Green Taxonomy to frameworks still being built elsewhere in the region.
A sustainable finance framework that only works for the home market is not, in truth, a group-wide framework.
Where this leaves institutions
For every institution, full compliance with the Central Bank of Kenya's requirements by October 2026 — as set out in its own guidance — is the non-negotiable starting point, and institutions should look to that guidance directly for the complete compliance requirements.
Beyond that baseline, the opportunity is larger than compliance. Taxonomy-aligned green lending, structured correctly, is a genuine growth lever in East African banking — one that can satisfy a regulator, attract concessional capital, and open a new product line at the same time.
Bringing on board a qualified advisor with global experience, and genuine grounding in local market realities - to connect governance design, risk quantification, product structuring, and regulatory alignment, tailored to how these pieces actually fit together in an East African context- can support the shift from a compliance milestone to a durable capital strategy. Part of that role is coordinating the multiple internal stakeholders — the business lines, risk & compliance, finance, credit, and internal audit — who need to stay aligned, and helping make clear where accountability sits for each of them.
