Featured image: Electricity pylons illustrate grid infrastructure. Contextual photograph; not a verified South African battery project or procurement site. Photo: Matthew Henry / Unsplash. Unsplash licence.
A battery can respond quickly to an electricity shortage, but its power rating tells only half the story. The missing half is how long that response can last.
On 7 October 2026, South Africa’s electricity minister proposed prioritising 4,600 megawatts of battery energy storage and 5,000 MW of gas-fired power in the first determination under the Integrated Resource Plan 2025. It is a procurement step, not 9.6 GW of operating plant. Read the government statement.
Megawatts need megawatt-hours
A megawatt measures power at a moment. A megawatt-hour measures energy delivered over time. A 100 MW battery able to discharge for one hour stores 100 MWh; the same power rating sustained for four hours requires 400 MWh. Both can be called 100 MW projects, but they serve different system needs.
The announcement gives a battery power target of 4,600 MW without a storage-duration or megawatt-hour figure. It says projects will be procured around system-operator instructions, availability and performance obligations. Until procurement documents define duration and cycling requirements, the amount of energy that can be shifted cannot be inferred from 4.6 GW alone. Battery procurement details.
Location will also matter. A battery behind a congested part of the network can absorb electricity that would otherwise be curtailed and return it later. A battery in a different grid area cannot automatically solve that particular bottleneck.
The first round places flexibility before new variable generation
The government says the first determination will not procure new wind or solar. A later determination is intended to cover those technologies, along with hybrid projects and pumped storage. The sequencing is presented as a response to system flexibility and network constraints, not as an abandonment of renewables. The proposed technology sequence.
The Integrated Resource Plan is a planning framework for South Africa’s future electricity mix. A Section 34 determination authorises a procurement direction under the Electricity Regulation Act; it does not by itself select bidders, close financing or connect equipment to the grid. Read the published Integrated Resource Plan 2025.
This distinction prevents planned capacity from being counted as supply. Between a determination and operation lie tender rules, bids, land, permits, equipment, transmission work, finance, construction and testing.
Gas is being asked to fill a different role
The proposed 5,000 MW gas programme is framed around start-up time, ramping, minimum operating levels and system flexibility. The government says fuel price, port and pipeline infrastructure, grid access and commissioning schedules will need assessment. Those unresolved inputs can materially change cost and timing. Gas programme considerations.
A gas turbine can produce energy as long as fuel arrives. A battery moves energy that was generated earlier. Treating the two technologies as equivalent because both have megawatt ratings hides their different fuel, emissions, duration and operating constraints.
Reuters reported that the proposal is intended to stabilise supply as the power system incorporates more variable generation. That outside account supports the policy context, while the official determination remains the primary source for its design. Reuters report, 7 October.
Earlier projects show progress and the distance left
The statement says five projects totalling 513 MW from the first battery bid window had reached commercial close and construction by June 2025, representing R15.4 billion of investment. Commercial close and construction are meaningful milestones, but they are not the same as dependable operation. Status of the earlier battery programme.
The next documents should specify duration, round-trip performance, connection points, construction deadlines and penalties for non-performance. Gas procurement will need equally concrete fuel and infrastructure assumptions.
South Africa has put a large number beside storage. Its real meaning will emerge only when power becomes energy, sites become connections and procurement becomes equipment that can respond when the system needs it.
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