South Africa’s National Transmission Company South Africa (NTCSA) will open the country’s first wholesale electricity market before the end of September, granting independent power producers and traders direct access to large customers for the first time and fundamentally reshaping how electricity is procured in Africa’s most industrialised economy.
The launch was pushed back from 1 April after NTCSA and the National Energy Regulator of South Africa (NERSA) — the statutory body responsible for licensing and regulating the country’s electricity, gas, and petroleum pipelines industries — jointly assessed that more work was needed on market, operational, and regulatory requirements.
NERSA had granted NTCSA its Market Operator Licence under the Electricity Regulation Act in December, authorising the company to operate the systems through which electricity is bought and sold.
Chief Executive Monde Bala said adjusting the timeline ensures the market is introduced responsibly. As the regulatory framework is finalised, Bala said, the market will progressively open to independent generators, traders, and other participants — with a phased approach designed to safeguard grid stability and reduce the risk of disruption.
The South African Wholesale Electricity Market (SAWEM) uses a hybrid net pool design, combining bilateral contracts between buyers and sellers with centralised dispatch and price formation. The structure initially facilitates trading between generators and large customers before widening participation further.
For independent producers with projects above 10MW, the model changes the revenue calculus significantly. Rather than relying solely on long-term fixed-price agreements, generators will be able to meet demand through short-term trading — a more dynamic and potentially more lucrative arrangement depending on market conditions.
Access to the market is gated on certification rather than on generation capacity. Only participants who have completed the SAWEM School — a three-day programme run monthly by NTCSA covering bid submission, market clearing, credit management, and compliance — will be eligible to trade. Sessions have been fully subscribed, and NTCSA is considering additional venues in the Free State and North West provinces to meet demand.
The market’s design carries particular significance for renewable energy investors. Coal currently supplies more than 70% of South Africa’s electricity.
Under marginal pricing — where the most expensive unit needed to meet demand sets the clearing price — coal plants will frequently set that price, while wind and solar projects, which carry near-zero marginal costs, will be dispatched ahead of them. That dynamic makes the market structure as commercially important to a renewable developer as the tariff itself.
The implications extend beyond South Africa’s borders. Southern Africa’s power grid is deeply interconnected through the Southern African Power Pool, and a functioning, transparent wholesale market in the region’s largest economy could influence how independent power producers structure projects and negotiate offtake arrangements across neighbouring markets.
