The first phase of the Seriti Wind Power Project in South Africa’s Mpumalanga Province has been completed, officials have confirmed. The milestone follows the early commissioning of the Vunumoya Main Transmission Station (MTS) in November, months ahead of its March 2026 deadline.
Developed by independent renewable energy firm Seriti Green, the transmission station was formally handed over to state‑owned utility Eskom and its subsidiary, the National Transmission Company South Africa (NTCSA). The facility includes advanced 400kV and 132kV infrastructure, a 500MVA transformer, and space for future expansion.
Eskom described the station as a “major grid‑enabling asset” that will support one of South Africa’s largest renewable energy developments. It allows the first 155MW from Seriti Green’s Ummbila Emoyeni One Wind Energy Facility to be fed into the national grid.
NTCSA chief executive Monde Bala said the project strengthens grid reliability and supports South Africa’s transition to a diversified, low‑carbon energy mix.
“I express sincere gratitude to our partners Seriti Green, the NTCSA teams and all stakeholders for the diligent execution of the project,” he added.
Situated in New Denmark, Lekwa Local Municipality, the project carries an estimated construction cost of $234m, financed by Standard Bank and Rand Merchant Bank. It has already created more than 1,100 jobs during construction, delivering both energy and employment benefits.
Electricity output is expected to rise steadily as construction continues. Power from the first phase will be supplied to Seriti Resources, part of the mining group’s commitment to decarbonising its operations. The project forms part of a broader 900MW programme by Seriti Resources to add renewable capacity.
Once fully developed, the Seriti project will comprise five wind farms, one solar PV facility, and one battery storage plant, making it the largest hybrid renewable energy cluster in South Africa.
Seriti Green chief executive Peter Venn said the energisation of the MTS marks the start of a multi‑year roll‑out with long‑term benefits for Mpumalanga and the national grid. “Wind power in Mpumalanga was once thought impossible. Today, it is a reality,” he said.
Mpumalanga, long known for coal mining, has become a focal point of South Africa’s energy transition. The province has attracted more than R15bn in investment in recent years, with over 2GW of renewable capacity underway.
“This province, once defined by coal, is now leading in clean energy. Seriti Green has turned vision into action,” said Mpumalanga Premier Mandla Ndlovu.
Eskom Group chief executive Dan Marokane welcomed the project’s role in modernising the grid as well as supporting South Africa’s clean energy trajectory.
“Projects like Vunumoya are vital for ensuring reliable, low‑carbon power for generations to come. This achievement is a clear demonstration of what collaboration and innovation can deliver,” he said.