Grid Limits Stall South Africa's Wind Projects
Transmission shortfalls leave wind capacity stranded as the state seeks R440 billion for grid expansion.
Updated on Nov. 11, 2026 in Utilities
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South Africa's wind energy projects face delays because the transmission grid cannot accommodate the available supply. Electricity curtailment costs the country close to R49 billion annually in potential revenue.
Why it matters
The shortage of available grid connections remains a major obstacle, particularly in the Cape provinces. Without faster transmission investment, new renewable capacity risks being generated but not delivered to users.
South Africa has about 4.2GW of installed wind capacity, while Africa had 11.1GW at the end of 2025. Curtailment costs roughly R49 billion a year, and the transmission programme faces a R134 billion funding shortfall.
The players
National Transmission Company South Africa
The state-owned utility responsible for building and operating the country's high-voltage transmission network, whose expansion is central to easing wind curtailment.
Kgosientsho Ramokgopa
South Africa's Minister of Electricity and Energy, who has led government efforts to reform the power sector and expand transmission investment.
Monde Bala
A South African public official cited in discussions of the country's wind and transmission programme.
Ian Davis
A South African public official cited in discussions of the country's wind and transmission programme.
The details
Curtailment occurs when electricity generation must be reduced because the transmission network cannot absorb the supply. The National Transmission Company South Africa plans roughly 14,500km of high-voltage lines over the next decade, while government considers added battery storage and exports of surplus electricity to neighbouring countries.
Timeline
6 and 7 October 2026: Windaba 2026 is held in Cape Town.
During 2026: More than 800MW of wind capacity enters commercial operation.
End of 2026: Wind installations are expected to exceed 1GW.
Second quarter of 2027: The final request for proposals for the first transmission phase is expected.
Over the next decade: The NTCSA plans to build about 14,500km of transmission lines.
Market Landscape
Regulatory reforms have enabled more than 3.3GW of corporate wind projects through power purchase agreements in under 30 months. Grid capacity, not project approval, now sets the pace for how quickly that capacity reaches consumers.
Households and businesses may see new renewable supply delayed if transmission capacity does not keep pace with generation. Electricity curtailment that wastes around R49 billion a year in potential revenue can ultimately affect the cost of power.
The takeaway
Transmission capacity, not generation, is the binding constraint on South Africa's wind expansion. Closing the R134 billion funding gap will decide how much of the planned capacity actually reaches the grid.
What happens next
The final request for proposals for the first transmission phase is expected in the second quarter of 2027, and installations are expected to exceed 1GW by the end of 2026.
Further reading
For the broader power-sector picture, explore more Utilities coverage from South Africa.
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