Media Release (This article was publised in Engineering News on 15 June 2026)
16 June 2026
South Africa’s Renewables Triumph Faces a Grid-Service Reckoning
As global energy investors, development finance institutions, and policymakers gather in Cape Town for the Africa Energy Forum this June, South Africa finds itself in an unfamiliar position: basking in the glow of a power sector triumph.
For years, the story of the country’s electricity sector was one of paralysis.
Today, the data reveals a radically different picture of increasing market resilience.
Under the framework of the Integrated Resource Plan (IRP), South Africa has quietly engineered a massive expansion of wind and solar capacity. Government-led bidding rounds have delivered over 7GW of operational green power, with another 4GW under construction. Concurrently, the country’s energy-intensive users—chiefly mining and industrial giants—have taken control of their own destinies, procuring over 5GW of private power.
Yet, the true wild card has been the "behind-the-meter" generation.
Driven by years of load-shedding and skyrocketing electricity bills, private homeowners and businesses have installed an astonishing 7GW of rooftop solar across the country. Energy Traders (or Aggregators) have emerged to allow smaller users to access utility scale renewable energy with over 3GW already procured.
In total, South Africa boasts a massive pipeline of over 26GW of renewable capacity either running or coming online soon. This staggering volume effectively meets the country’s growth requirements in the IRP up to 2027. Looking toward 2032, an additional 14GW of renewables is scheduled to join the mix.
The economic logic behind this boom is simple: renewable energy is now incredibly cheap.
When contrasted against Eskom’s standard daytime wholesale tariffs, the financial signal is clear. Building renewable generation remains a highly profitable move for investors and users.
However, this rapid build-out of power has exposed a profound mismatch between intermittent renewable power generation and the ability of our grid to manage it.
Severe grid congestion in the wind-rich Eastern and Western Cape provinces mean South Africa's renewable pipeline is becoming heavily skewed toward solar. This concentration presents a looming financial crisis: daytime supply is on track to outstrip demand leading to curtailment of excess energy.
During peak daylight hours, South Africa's electricity demand hovers between 20GW and 25GW—a load that can increasingly be met almost entirely by renewables. However, when the sun sets and millions of households turn on their stoves and appliances, demand spikes sharply into the evening peak. Because renewables cannot bridge this gap, the country’s aging coal fleet must remain online, idling at minimum capacity throughout the day simply to be ready to ramp up for the evening surge.
The financial consequence of this bottleneck is severe.
The grid will soon face a surplus of daytime energy that must be paid for under strict "take-or-pay" contracts but ultimately wasted because there is nowhere for it to go. Conversely, the critical morning and evening peaks will face chronic supply deficits.
As South Africa prepares to launch its new traded Wholesale Electricity Market which will determine the System Marginal Price for electricity on an hourly basis throughout the day, the system must already begin to encourage the right investment behaviour.
Historically, our renewable energy procurement mechanisms rewarded the sheer volume of green electrons produced. In the next phase of the energy transition, the market must explicitly reward the ability to deliver that electron at a certain time and to improve grid resilience—both of which can be provided by energy storage.
Currently, South Africa’s storage pipeline is painfully inadequate.
While the state has already committed to 2GW of battery programmes and utilises roughly 3GW of pumped-hydro capacity, long-term planning remains sluggish. The current IRP envisions adding just 4GW of battery storage by 2032 and pushes further pumped-hydro expansion out to 2037. Similarly, while gas-to-power programmes target a combined 5GW to 6GW of mid-merit capacity by 2030, global supply chain bottlenecks for gas turbines mean these projects face potential delays.
To safeguard the 26GW of renewable capital already deployed, our models indicate that South Africa requires an additional 2GW to 5GW of commercial energy storage online well before 2030. Without it, the grid will choke on its own clean energy, and the country will miss its legally binding international decarbonisation targets.
Inevitably, the public debate will be driven by vested interests defending their own positions. Coal advocates will demand costly life-extensions for crumbling stations; gas lobbies will push for massive pipelines; and battery developers will claim they are the only solution.
To cut through this noise, South Africa must establish a transparent, market-determined price for "capacity" and grid ancillary services.
If electricity market participants have better insight into the true cost of keeping the network stable, the market will naturally allocate capital across a healthy mix of technologies.
For investors at the Africa Energy Forum, the message is clear: the next immediate frontier of investment in South Africa is no longer just generating power—it is storing and managing it.
By Keith Webb, Senior Investment Banker for Infrastructure Sector Solutions at RMB
ENDS
