Trader-Led Wheeling Is Now the Default Model for South African C&I Energy Procurement: What the Shift From One-to-One Bilateral PPAs to Aggregated Portfolio Supply Means for Contract Flexibility, Volume Risk, and Pricing Power in 2026

The Default Has Shifted: Trader-Led Wheeling Is Now the Primary Model for South African C&I Energy Procurement in 2026

South Africa's commercial and industrial (C&I) energy market has crossed a structural threshold. The one-to-one bilateral Power Purchase Agreement (PPA) — long the default contracting model for corporates procuring renewable electricity — is being displaced by trader-led, aggregated portfolio supply delivered via electricity wheeling. For commercial property owners, industrial tenants, and funded solar developers alike, this shift is rewriting the rules on contract flexibility, volume risk, and pricing power.

From Bilateral to Aggregated: What Changed

For years, the dominant model was straightforward: a single independent power producer (IPP) contracted directly with a single offtaker under a long-term PPA. This one-to-one model works well for mining houses and large industrial customers, but it is reaching saturation — around 80% of the 5,700 MW currently under construction is already contracted, leaving the remaining 6,372 MW of projects in development at least 24–36 months from delivery and increasingly constrained by grid capacity.

Most importantly, trader-led, portfolio-based aggregation models are beginning to replace traditional one-to-one bilateral PPAs. In 2026, trader-led wheeling is poised to become the dominant commercial model in the South African private power market.

Under this model, licensed traders sit between IPPs and end-users, coordinating supply and demand across portfolios, managing volume and balancing risk, and assuming much of the administrative and operational complexity historically carried by buyers.

How Aggregated Portfolio Supply Works

Aggregation enables renewable supply to be bundled, balanced and shaped around customer demand profiles. It simplifies contracting, reduces counterparty risk and provides flexibility that single-asset agreements struggle to offer. In practical terms, it allows corporates to secure renewable electricity aligned with operational needs while traders manage intermittency and balancing risk across diversified portfolios.

The entry of aggregators and energy traders has turbocharged the speed of market development. Their role is essentially arbitraging renewable power from different sources, in different parts of the country and at different times of day, to service clients who would not be able to procure it directly or build it themselves.

A live example of the pooled model in action: building on Cape Town's first renewable electricity wheeling pilot with Growthpoint and Etana Energy in 2023, the new pooled wheeling model completed its first pooled allocation in April 2026. Pooled wheeling lets electricity from one or more remote generation sites be allocated across a portfolio of customers on a grid — matching supply and demand across the portfolio, rather than site by site, creating a simpler, more flexible and scalable way to allocate and settle electricity.

What It Means for Commercial Property Owners

The implications for commercial property owners and landlords are significant and immediate:

• Shorter, more flexible contracts: The rise of trader-led market models is enabling greater flexibility and shorter contract structures for corporate buyers, with growing demand for flexible energy agreements as C&I customers increasingly expect suppliers to share risk.
• Portfolio-scale access: Licensed electricity traders act as a single point of accountability, managing and settling variable electricity charges across an entire portfolio of customers — significantly simplifying billing while giving participating customers access to competitively priced renewable electricity.
• Multi-site strategies now viable: Large energy users are already developing multi-site solar and storage strategies. The shift is operational, not conceptual.
• Rising Eskom tariffs make action urgent: NERSA has confirmed tariff increases of 8.76% from April 2026, followed by a further 8.83% in April 2027 — on the backdrop of a decade in which tariffs rose by approximately 180%.

The Role of Funded Solar and BESS

The growth of wheeling has been accompanied by the emergence of new market participants. IPPs continue to develop, own and operate generation assets. Electricity traders aggregate demand and supply, purchasing electricity from generators and selling it to end users. GenTraders combine both functions by owning generation assets while also holding trading licences — together helping to create a more competitive and accessible private electricity market.

Battery Energy Storage Systems (BESS) are central to making the trader-led model work. By integrating large-scale solar generation with battery energy storage, plants can store daytime production and dispatch it during evening peak demand — transforming solar from a variable energy source into a dispatchable product capable of supporting grid stability and industrial reliability. For energy-intensive offtakers, this model delivers stable clean power at competitive tariffs while reducing exposure to Eskom volatility.

The landmark example is SOLA Group's Naos 1 project: Naos-1 is described as the country's first utility-scale solar PV and battery energy storage project purpose-built for wheeling power to private end-users across the grid, featuring a 300 MW (435 MWp) solar PV facility colocated with 660 MWh of battery storage, supported by 25-year PPAs with Sasol and Air Liquide.

On the financing side, institutional confidence is deepening. Banks have become increasingly comfortable with long-term debt on private PPAs, with 18-year terms now commonplace. This mindset shift has been supported by the arrival of a vibrant market in energy trading where banks can take a view on the strength of the market, as opposed to the creditworthiness of the individual offtaker — meaning that in a wheeling arrangement, if an offtaker is unable to fulfil the contract, the asset will not be stranded.

Data compiled by the Power Futures Lab at the University of Cape Town indicates that six major projects totalling 1,788 MW reached financial close during the first months of 2026, with more than 5,700 MW of projects potentially financed this year should the current development pipeline proceed as expected.

The SolarXgen Perspective

For commercial property owners considering funded solar and BESS, the trader-led wheeling era offers a compelling opportunity — but also demands sharper procurement discipline. Shorter contracts and aggregated supply mean more flexibility, but buyers must understand how volume risk is allocated, how wheeling charges are structured, and how BESS dispatch will be optimised across a shared portfolio. Wheeling is also increasingly relevant from a sustainability perspective: as export markets introduce stricter carbon-related requirements, access to renewable energy is becoming an important competitive consideration, and wheeling allows companies in urban or space-constrained environments to access renewable energy generated in areas with stronger solar and wind resources.

The direction taken in 2026 will determine whether South Africa's electricity sector evolves into a flexible, market-based system led by private innovation — or remains constrained by opaque subsidies and legacy industrial policy. For C&I buyers, the window to lock in competitive terms under the current market structure is narrowing.