The Thesis
Islamic finance has always been values-based. The emergence of ESG as a mainstream investment framework has handed it an unexpected argument: for the first time, the things Islamic finance already excludes are the same things mainstream institutional investors are trying to avoid. Green sukuk is where that alignment is becoming a market.
The Numbers That Tell the Story
By early 2025, Fitch Ratings put the outstanding value of ESG sukuk at $44.5 billion — up 23% year-on-year. Multiple research projections put that figure at $58 billion by end of 2025 and above $70 billion through 2026. In parallel, S&P Global forecasts total sukuk issuance at $270–280 billion for the full year.
That makes ESG sukuk approximately 25% of total sukuk outstanding — a meaningful share of a market that now exceeds $1 trillion.
Saudi Arabia and the UAE are the dominant issuers, representing 68% of total ESG sukuk issuance in the first nine months of 2025, according to Zawya. Indonesia and Malaysia lead in domestic-currency issuances, driven by green infrastructure financing needs. In 2026, green sukuk issuance alone is projected to reach $10–12 billion.
Why the Convergence Works
Halal and ESG share more exclusions than either framework typically acknowledges. Both screen out alcohol, tobacco, gambling, and weapons manufacturing. ESG targets high-emission industries; halal requires transparency and prohibits gharar — excessive uncertainty that obscures risk. The theological foundations are different, but the portfolio construction results often overlap.
The key structural difference is the prohibition on riba (interest) in Islamic finance and the requirement that returns be tied to real economic activity. This constraint, which can seem like a limitation in conventional markets, actually aligns well with green project finance. Sukuk are asset-backed by design. Green assets — solar plants, efficiency projects, sustainable buildings — are exactly the kind of tangible underlying assets that a sukuk structure requires.
Sustainable sukuk, the broader category that includes green, social, and sustainability instruments, accounted for approximately 35% of total sustainable bond and sukuk issuances in recent periods. That is not a niche anymore.
The Standardization Problem
The convergence is not seamless. Green sukuk issuers face a dual compliance burden: Shariah boards must approve the structure and asset selection, and frameworks like the ICMA Green Bond Principles — adapted for sukuk in guidance published in April 2024 by ICMA, the Islamic Development Bank, and LSEG — govern the green credentials. That dual-approval process is more rigorous than conventional green bonds, which is an argument for credibility but a constraint on speed.
There is also a fragmentation problem. Different Shariah boards may reach different conclusions about the same green asset. Solar panels on a compliant facility are generally accepted. Carbon trading instruments remain contested. The industry is still working out where the bright lines fall, and the absence of a universal standard creates compliance risk for cross-border issuances.
The Limit Worth Naming
Green sukuk’s share of the overall sukuk market — roughly $10–12 billion issuance against $270–280 billion total — is still small. Most sukuk growth in H1 2026 came from Malaysia’s domestic local-currency market, not from ESG-labelled instruments. The sustainability label adds credibility for certain investor pools, but it does not yet drive issuance decisions at scale.
The question is whether infrastructure spending — Vision 2030 in Saudi Arabia, green energy transitions in Southeast Asia, development finance in Africa — will pull ESG sukuk into a larger role, or whether it remains a premium product for investors with specific mandate requirements.
What to Watch
The pipeline that matters most for the halal economy audience is sovereign and development finance. The Islamic Development Bank has historically been the largest single issuer of sustainable sukuk. As African governments — following Benin’s lead — explore Islamic capital markets, green sukuk for development projects becomes the natural instrument for water, energy, and urban infrastructure financing.
Whether the market sustains its 23% annual growth depends on two variables: continued GCC sovereign issuance, where Saudi Arabia’s Vision 2030 infrastructure pipeline is the primary driver, and the emergence of Southeast Asian sovereign green sukuk programs at scale. Both are active in H2 2026. The $70 billion figure is achievable. Whether it is the ceiling or the floor is the more interesting question.