Green Tech Bankability in Indonesia: TKBI, Green Sukuk, and Credibility Gaps

Green Tech Bankability in Indonesia: TKBI, Green Sukuk, and Credibility Gaps

Renewable projects don’t fail because technology is weak. They fail because investors can’t defend the sustainability claim with paperwork they can verify.

In Indonesia, that paperwork increasingly starts with eligibility language set by the Indonesian Taxonomy for Sustainable Finance, known as TKBI. TKBI is a classification framework published by the Financial Services Authority (OJK) that defines which economic activities can be treated as sustainable (and often includes “green” and “transition” categories). (Source: https://www.ojk.go.id/en/berita-dan-kegiatan/siaran-pers/Documents/Pages/Taxonomy-for-Indonesian-Sustainable-Finance-2nd-Edition/40%20%5BPress%20Release%5D%20Taksonomi%20untuk%20Keuangan%20Berkelanjutan%20Indonesia%20%28TKBI%29%20Versi%202_EN.pdf)

This is why TKBI has become a medium-term growth lever. When an issuer, lender, or investor can’t back up a sustainability claim, capital costs rise or vanish. When eligibility is broad but verification capacity lags, the market can end up paying for “green labels” without cutting real risks.

That urgency shows up in speed and scale. OJK has published multiple iterations of TKBI, including a Version 2 released on 11 February 2025, which expands coverage and refines concepts such as “Do No Significant Harm” (DNSH). DNSH is designed to ensure a “sustainable” activity does not cause other significant environmental harm. (Source: https://www.ojk.go.id/en/berita-dan-kegiatan/siaran-pers/Documents/Pages/Taxonomy-for-Indonesian-Sustainable-Finance-2nd-Edition/40%20%5BPress%20Release%5D%20Taksonomi%20untuk%20Keuangan%20Berkelanjutan%20Indonesia%20%28TKBI%29%20Versi%202_EN.pdf)

And it shows up in issuance momentum. OJK has recorded bond and sukuk issuance based on sustainability reaching IDR 36.4 trillion, as reported in an OJK-related update relayed in late March 2026. (Source: https://www.nhis.co.id/ojk-catat-penerbitan-obligasi-dan-sukuk-hijau-mencapai-idr-36-4-triliun/)

The paradox is familiar: the framework is getting better faster than the market’s ability to verify outcomes.

What TKBI changes for renewable bankability

TKBI’s value isn’t just that it signals climate ambition. It narrows ambiguity into categories that capital markets can price. The catch is that pricing becomes realistic only when taxonomy categories connect to deal structure and investor diligence.

OJK frames TKBI as supporting sustainable finance flows aligned to Indonesia’s national objectives for net zero emissions and sustainable development. (Source: https://keuanganberkelanjutan.ojk.go.id/keuanganberkelanjutan/en/)

For renewable energy financing, that linkage matters across four investor concerns: activity definition (what counts), eligibility boundaries (which parts qualify and under what criteria), risk controls (including DNSH), and disclosure plus follow-up (how performance is evidenced after money is released).

In practice, bankability improves when TKBI helps close three diligence gaps that used to be solved case-by-case:

• Category-to-project translation: whether taxonomy language cleanly maps to the technical scope of wind, solar, or geothermal assets and to their life-cycle footprint.
• Harm-check coverage: whether DNSH screening is explicit enough to be embedded into credit approval and environmental/social risk management, rather than treated as a post-issuance narrative.
• Evidence planning: whether documentation requires measurable outputs (reporting lines, methodologies, assurance expectations) before investors commit capital.

OJK’s updates push in that direction. OJK published TKBI Version 2 in February 2025, and the taxonomy site explicitly describes TKBI as a transformation from an earlier Indonesian green taxonomy, designed to become part of the “sustainable finance ecosystem.” (Source: https://keuanganberkelanjutan.ojk.go.id/keuanganberkelanjutan/en/)

TKBI is also tied to broader regulatory alignment. For example, it is discussed as aligning with the P2SK Law framework (Law No. 4 of 2023 on Developing and Strengthening of the Financial Sector). That legal anchor affects bankability because it signals continuity: investors look for stability in classification systems before committing. (Source: https://www.ojk.go.id/en/berita-dan-kegiatan/siaran-pers/Documents/Pages/Taxonomy-for-Indonesian-Sustainable-Finance-2nd-Edition/40%20%5BPress%20Release%5D%20Taksonomi%20untuk%20Keuangan%20Berkelanjutan%20Indonesia%20%28TKBI%29%20Versi%202_EN.pdf)

Still, credibility can lag definitions. Taxonomies can be detailed; credibility depends on verification capacity. The operational test is whether issuers and verifiers apply TKBI consistently enough that investors can run comparable due diligence across deals--especially on DNSH and “social aspects” requirements, where renewable projects often face the hardest trade-offs (land, local services, and supply-chain constraints).

So what: Regulators and institutional investors should treat TKBI less like a marketing label and more like a governance contract. The immediate action is to require standardized, auditable evidence mapped to TKBI eligibility, then stress-test it with a reusable investor question: for this specific renewable asset, what exactly is the DNSH/social screen, what methodology is used, who verifies it, and how often is it updated as the taxonomy evolves?

Green sukuk vs sustainability-linked contracts

Indonesia’s green financing ecosystem uses different contractual logics, and those logics reshape bankability.

Green sukuk (Islamic bonds structured under sharia principles) are typically proceeds-based: funds are intended for eligible green activities. The goal is to link cash flow to underlying project or program categories. Indonesia’s green sukuk program has been active for years, and Indonesia’s retail green sukuk issuance is documented as starting domestically before expanding further. A World Bank-related presentation notes retail domestic sukuk issuance figures for 2019–2024, including Green Sukuk among retail domestic instruments. (Source: https://thedocs.worldbank.org/en/doc/bb95fcb00756fcb8a7b4a18400ed427a-0430012024/related/IRDMC-Symposium-2024-Indonesia-Session-1-PUBLIC.pdf)

A concrete outcome is reported for retail green sukuk. ANTARA reported that Indonesia issued domestic retail green sukuk with a total value of Rp 21.8 trillion (about US$1.4 billion) since 2019 and that the government said issuance helped cut carbon emissions by more than 10.5 million tons. (Source: https://en.antaranews.com/news/299598/indonesia-raises-14-bln-from-retail-green-sukuk-for-climate-projects)

Those figures matter beyond symbolism. Proceeds-based instruments can be scored for traceability: did the funds actually reach qualifying activities?

Sustainability-linked loans (SLLs) and sustainability-linked bonds work differently. In sustainability-linked instruments, coupon or pricing adjusts based on whether predefined sustainability performance targets (SPTs) are met. Importantly, proceeds do not necessarily need to be invested in projects with positive environmental outcomes. OECD explains this distinction directly for sustainability-linked bonds. (Source: https://www.oecd.org/en/publications/2025/06/asia-capital-markets-report-2025_8c82611c/full-report/sustainable-bonds_21e9a353.html)

That logic can strengthen bankability because it prices performance risk, not only project selection. It also shifts credibility to a different place: investors must trust that SPTs are meaningful, measurable, and independently verified.

Indonesia supports sustainability-linked instruments through OJK regulation. OJK has issued Regulation No. 18/2023 on the issuance and requirements for debt securities and sukuk based on sustainability. (Source: https://www.ojk.go.id/en/berita-dan-kegiatan/siaran-pers/Documents/Pages/OJK-Issues-Regulation-on-Issuance-and-Requirements-For-Debt-and-Sukuk-Securities-Based-on-Sustainability/PR%20-%20OJK%20ISSUES%20REGULATION%20ON%20ISSUANCE%20AND%20REQUIREMENTS%20FOR%20DEBT%20AND%20SUKUK%20SECURITIES%20BASED%20ON%20SUSTAINABILITY.pdf)

Internationally, credibility mechanics for sustainability-linked instruments depend on independent external verification. ICMA’s Sustainability-Linked Bond Principles state that issuers should seek independent and external verification of performance against SPTs. (Source: https://www.icmagroup.org/assets/documents/Sustainable-finance/2023-updates/Sustainability-Linked-Bond-Principles-June-2023-220623.pdf)

So what: Policy readers should separate two questions that markets often mix up. Proceeds-based instruments need “eligibility traceability.” Sustainability-linked instruments need “target integrity.” Indonesia’s scaling depends on strengthening both, using different governance tools.

A credibility gap you can spot in deals

Indonesia’s green tech bankability depends on whether eligibility and verification behave like a system, not a portfolio of separate deals.

Start with governance boundaries. OJK’s TKBI framework explicitly includes DNSH and social aspects concepts in its revisions, reflecting an intent to reduce greenwashing risk by screening not only environmental benefits but also potential harms. (Source: https://www.fortuneidn.com/finance/tkbi-versi-kedua-sustainable-finance-lebih-inklusif-dan-terarah-00-98121-9ywmvn)

Evidence asymmetry is the next problem. In sustainability-linked loans, borrower performance targets may not map neatly to TKBI categories because the instrument logic is performance adjustment rather than project earmarking. OECD’s explanation of sustainability-linked bonds reinforces that proceeds do not need to finance eligible environmental projects. (Source: https://www.oecd.org/en/publications/2025/06/asia-capital-markets-report-2025_8c82611c/full-report/sustainable-bonds_21e9a353.html)

That mismatch is where “renewable bankability” expectations can drift from the instrument’s cash-flow mechanics.

Verification capacity also varies by sector. Independent verification is a principle in ICMA guidance. (Source: https://www.icmagroup.org/assets/documents/Sustainable-finance/2023-updates/Sustainability-Linked-Bond-Principles-June-2023-220623.pdf) But guidance can fail in practice if the market lacks qualified reviewers, consistent methodologies, or disclosure templates investors can compare.

Finally, sustainability-linked instruments face a structural temptation: targets can be too lenient or insufficiently tied to capital deployment. Updated market guidance emphasizes how reporting frequency and verification should cover any date or period relevant to assessing performance, and highlights the need for rigorous verification. (Source: https://www.lma.eu.com/application/files/3517/4298/0872/Guidance_on_Sustainability-Linked_Loan_Principles_-_26_March_2025.pdf)

To make the credibility gap measurable, look for three observable breakdown patterns across deal documentation and follow-up reporting. Each one points to a different link in the credibility chain:

1. Eligibility drift (proceeds-based only): the deal claims alignment to TKBI, but post-issuance allocation reports show frequent remapping, exceptions, or unclear attribution of funds to eligible categories.
2. Method drift (both types): investors can’t reproduce the reported outcome because methodologies, baselines, or DNSH/social screen definitions change, or external assurance coverage is limited rather than covering the whole claim.
3. Verification gap (sustainability-linked especially): independent reviewers verify the existence of data rather than the integrity of the performance calculation, or verification timing and reporting cadence don’t match the periods used to test SPTs.

So what: Indonesia should not “trust the label.” Institutional investors should build internal screens that ask three governance questions for every renewal: Are eligibility rules clear? Is verification independent? Does the instrument logic align with investors’ real risk model?

Case signals from Indonesia’s green finance

Bankability is easiest to read through named transactions that reveal incentives, timelines, and outcomes.

Retail green sukuk since 2019

Indonesia’s retail green sukuk is a measurable attempt to broaden investor participation by bringing sustainable fixed income into domestic retail channels. ANTARA reported that the government issued Rp 21.8 trillion in domestic retail green sukuk since 2019, and the government claimed more than 10.5 million tons of carbon emissions reduction associated with this program. (Source: https://en.antaranews.com/news/299598/indonesia-raises-14-bln-from-retail-green-sukuk-for-climate-projects)

Outcome quality: this is a proceeds-based story supported by official statements, which tends to reduce instrument-logic ambiguity for investors. The fragility is that claimed outcomes must be continuously evidenced, especially as TKBI evolves.

First sustainability-linked loan in 2025

IFC announced its first sustainability-linked loan in Indonesia in February 2025 for PT Nirvana Wastu Pratama, aimed at expanding green building certification of its portfolio. (Source: https://www.ifc.org/en/pressroom/2025/ifc-s-first-sustainability-linked-loan-in-indonesia-to-decarbonize-retail-properti)

Why it matters for renewable bankability even when the use is “green buildings”: sustainability-linked instruments shift the question from “which projects were financed” to “did sustainability targets move.” Investors also learn faster when guidance explains how targets are set and verified. IFC’s statement explicitly mentions “clear technical guidance” for meeting targets and refining the framework. (Source: https://www.ifc.org/en/pressroom/2025/ifc-s-first-sustainability-linked-loan-in-indonesia-to-decarbonize-retail-properti)

Outcome quality: strong on governance process, but long-term credibility depends on whether performance reporting and independent verification stay consistent through subsequent renewals.

TKBI Version 2 release in February 2025

OJK released TKBI Version 2 on 11 February 2025, and the taxonomy site indicates Version 1 was published in February 2024, with Version 2 following in 2025. (Source: https://keuanganberkelanjutan.ojk.go.id/keuanganberkelanjutan/en/)

Outcome quality: a policy signal that eligibility boundaries remain under active refinement. Bankability improves when refinements stabilize, and weakens when updates arrive frequently without transitional guidance for existing instruments.

Global guidance shaping Indonesia’s expectations

OECD’s Asia Capital Markets Report 2025 discusses how sustainability-linked instruments work and highlights risks around consequences for missing targets and reporting commitments. (Source: https://www.oecd.org/en/publications/2025/06/asia-capital-markets-report-2025_8c82611c/full-report/sustainable-bonds_21e9a353.html)

ICMA’s principles then translate those expectations into verification requirements. (Source: https://www.icmagroup.org/assets/documents/Sustainable-finance/2023-updates/Sustainability-Linked-Bond-Principles-June-2023-220623.pdf)

Outcome quality: market credibility depends on how these global principles get reflected in Indonesia’s issuance rules and enforcement.

So what: Treat these cases as a map. Proceeds-based retail sukuk can anchor eligibility traceability. Sustainability-linked instruments can scale performance incentives, but only if verification routines and target integrity remain consistent.

How investors can scale without greenwashing

Institutional investors aren’t passive buyers of labels. They shape whether green assets become a repeatable category for credit allocation.

Start with instrument-to-taxonomy alignment. Investors should demand mapping between an instrument’s logic and TKBI eligibility boundaries. If the instrument is proceeds-based, investors should expect funds routed to TKBI-defined eligible activities, not just “sustainable themes.” If it is sustainability-linked, investors should expect SPTs to be outcome-linked and verification-backed, even when proceeds are not project-earmarked. OECD’s definition of sustainability-linked bonds explains why this isn’t optional. (Source: https://www.oecd.org/en/publications/2025/06/asia-capital-markets-report-2025_8c82611c/full-report/sustainable-bonds_21e9a353.html)

Then push for standardized governance across asset managers and insurers. TKBI can make classification more consistent, but enforcement and reporting templates need to make results comparable. When reporting is inconsistent, “green” becomes a higher-uncertainty credit category.

Investors also need stewardship that extends beyond underwriting. If an issuer keeps using sustainability-linked instruments without meaningful performance movement, the instrument’s market premium should shrink. That’s a practical consequence of ICMA’s emphasis on external verification and performance against targets. (Source: https://www.icmagroup.org/assets/documents/Sustainable-finance/2023-updates/Sustainability-Linked-Bond-Principles-June-2023-220623.pdf)

Finally, watch market scale signals because liquidity affects bankability. OJK’s reported IDR 36.4 trillion sustainability-based issuance suggests depth is building, which can lower transaction costs and attract larger mandates. (Source: https://www.nhis.co.id/ojk-catat-penerbitan-obligasi-dan-sukuk-hijau-mencapai-idr-36-4-triliun/)

So what: Build two internal product acceptance rules. One should cover eligibility traceability in proceeds-based green sukuk. The other should cover target integrity and external verification in sustainability-linked loans. That shifts “renewable energy bankability” from a marketing expectation into a repeatable underwriting standard.

Policy steps and a 2028 credibility shift

Indonesia’s sustainable finance momentum is real. Scaling bankability depends on closing credibility gaps while stabilizing eligibility boundaries.

What OJK should publish in 2026

OJK should publish a time-bound “credibility dashboard” for renewable and green-infrastructure eligibility that makes three items comparable across issuers: (1) how the activity is mapped to TKBI, (2) which DNSH and social safeguards apply, and (3) what verification approach is used for performance claims. TKBI Version 2 already frames DNSH and social aspects as part of reducing greenwashing risk. (Source: https://www.fortuneidn.com/finance/tkbi-versi-kedua-sustainable-finance-lebih-inklusif-dan-terarah-00-98121-9ywmvn)

OJK should also issue explicit transitional guidance for existing instruments whenever taxonomy updates occur, to avoid eligibility drift that increases investor due diligence cost. TKBI’s iteration history (Version 1 in February 2024, Version 2 in February 2025) signals that updates are part of the program. (Source: https://keuanganberkelanjutan.ojk.go.id/keuanganberkelanjutan/en/)

What market participants should do now

1. Banks and underwriters should require standardized documentation for TKBI mapping within deal teams, and attach independent verification scope statements for sustainability-linked instruments, consistent with ICMA’s verification principle. (Source: https://www.icmagroup.org/assets/documents/Sustainable-finance/2023-updates/Sustainability-Linked-Bond-Principles-June-2023-220623.pdf)
2. Institutional investors should separate proceeds-based and sustainability-linked underwriting criteria, consistent with OECD’s instrument logic. (Source: https://www.oecd.org/en/publications/2025/06/asia-capital-markets-report-2025_8c82611c/full-report/sustainable-bonds_21e9a353.html)
3. Sharia finance ecosystem participants should align “green sukuk” eligibility tracking with TKBI’s evolving categories so bankability does not depend on inconsistent internal frameworks.

Forecast to 2028

If OJK publishes comparative credibility guidance in 2026 and issuers institutionalize standardized verification in subsequent renewals, Indonesia can plausibly shift renewable energy bankability from “taxonomic eligibility” to “evidenced eligibility”--reducing perceived credit uncertainty for large institutional mandates.

A conservative forecast for 2026–2028 is that sustainability-based issuance in Indonesia continues expanding but becomes more selective. Deals will increasingly differentiate between proceeds-based traceability and sustainability-linked target integrity. The credibility gap won’t disappear, but it will get priced through diligence timelines, assurance scope expectations, and mandates’ willingness to accept instruments with incomplete mapping or weak verification cadence.

By 2028, the clearest market signal would be fewer one-off green classifications and more repeatable underwriting templates: standardized TKBI mapping exhibits for proceeds-based sukuk, and standardized SPT and verification schedules for sustainability-linked instruments. In that scenario, Indonesia’s green tech finance stops asking investors to trust labels and starts asking them to review evidence that can be compared across issuers.

So what: Operationalize credibility, then demand it. When governance loops connect TKBI eligibility to auditable verification, the energy transition becomes a financing strategy--not a policy slogan.