Water scarcity is one of South Africa's most urgent infrastructure challenges. Climate change, population growth and decades of underinvestment have created a water security crisis that can no longer be deferred.

Against this backdrop, South Africa's first outcomes-based water bond marks a significant development in sustainable finance and in the legal frameworks governing impact-driven infrastructure investment.

The regulatory and commercial challenge

South Africa's water sector is governed by a complex regulatory environment, shaped by the National Water Act and related instruments governing resource allocation, catchment management and environmental compliance.

While the framework is robust, chronic underinvestment has left significant gaps in water security infrastructure, prompting growing interest in blended finance structures combining public, philanthropic and private capital.

This has driven growing interest in blended finance models that combine public, philanthropic and private capital. Outcomes-based instruments, which link investor returns directly to independently verified performance metrics, offer a mechanism for aligning financial incentives with measurable impact.

A first-of-its-kind outcomes-based structure

The Cape Water IAP Removal Project (the Project) illustrates how outcomes-based financing can be applied to nature-based water security solutions. The project targets the removal of invasive alien plants (IAPs) in strategically important Western Cape catchments.

IAPs consume significantly more water than indigenous vegetation. Their removal improves rainwater flow into dam systems, strengthening regional water security without the need for large treatment plants. While the ecological science is well established, scalable funding and legal structures have historically been lacking.

To address this, an outcomes-based funding structure was developed by the FirstRand Bank to support the implementation of this project. The only other comparable outcomes-based project globally is the Rhino Bond implemented by the World Bank.

The structure comprises two components:

• the issuance of notes to investors, pursuant to which investors receive a fixed coupon lower than a market-related coupon and a variable coupon linked to the achievement of certain milestones, being the number of hectares of IAPs removed. The differential between the market-related coupon and the fixed coupon is invested by the issuer to fund certain project costs, as well as the variable coupon payable to the noteholders; and
• donations made by philanthropic parties (the donors) to the project implementer. These donations do not earn any return and are not repayable, including where the project does not proceed to completion.

Delivering a transaction of this nature required a bespoke legal architecture, developed by Webber Wentzel. The contractual framework included advice on the FRB Water Performance-Based Bond, a five-year, ZAR 2.5-billion senior unsecured bond due on 30 June 2031, issued under the issuer's domestic medium-term note programme and listed on the JSE. It also encompassed the suite of legal agreements required to implement the project, including agreements governing the relationship between the project implementer and the donors.

The legal architecture is without precedent in South Africa. The project documents comprise a fully bespoke suite governing delivery, monitoring and verification across multiple stakeholders. These documents establish a foundational legal framework for outcomes-based, nature-based impact finance in South Africa.

What this means for the sector

For infrastructure and project developers, this transaction demonstrates that large-scale, nature-based solutions can be structured and financed through capital markets. The legal framework is designed to be scalable and replicable.

For investors and financial institutions, the bond establishes a template for outcomes-based instruments in South Africa.  As sustainability-linked investment criteria become more prominent across institutional portfolios, structures that move beyond use-of-proceeds and link returns directly to performance are likely to gain more traction.

For corporates and industrial water users, increasing water scarcity translates directly into operational and supply chain risk. Transactions of this nature are likely to accelerate policy development in areas such as water rights, catchment management and corporate water stewardship.

More broadly, the transaction also signals growing market confidence in outcomes-based sustainable finance.

A positive shift for South Africa

The convergence of intensifying climate pressure, rapid urbanisation and increasing institutional appetite for impact-driven investment requires innovation in how infrastructure is financed. This transaction demonstrates that South Africa's capital markets, legal frameworks and institutional participants can deliver sophisticated solutions to complex national challenges.

Written by Khurshid Fazel, Partner and Kiera Bracher, Associate, Webber Wentzel