On 26 November 2025, Seriti Green, together with Eskom and its subsidiary, the National Transmission Company South Africa (NTCSA), celebrated the formal handover of the Vunumoya Main Transmission Station (MTS) by Seriti Green to Eskom. This project, with an investment value of more than R1 billion and delivered over 18 months, represents a major grid-enabling asset that will support one of South Africa’s largest renewable energy developments.
Seriti Green, Eskom, NTCSA and representatives of the Gert Sibande District Municipality celebrate the handover of Vunumoya Main Transmission Station.
The handover confirms that the Vunumoya MTS is fully energised, operational and integrated into the national grid. This enables the first 155 MW of wind energy from Seriti Green’s Ummbila Emoyeni One Wind Energy Facility to be fed into the system ahead of schedule, marking the beginning of a 900 MW programme that will progressively add further renewable capacity to grid.
Significantly, Ummbila Emoyeni is located near Bethal/Morgenzon in the heart of the country’s coal mining territory and where most of Eskom’s coal-fired power stations are. It is also a region where the potential for wind and solar energy generation was initially dismissed by many.
Speaking at the handover ceremony, Seriti Group CEO Mike Teke spoke about opportunity – and specifically the opportunity that Seriti recognised in Mpumalanga – to enable the province and the people of the province – where the Seriti Group continues to operate several coal mines – to be part of the Just Energy Transition. Teke said the new MTS demonstrates what coordinated delivery can achieve for South Africa’s evolving energy sector. “Today’s handover of the Vunumoya Main Transmission Station demonstrates what effective partnership can achieve. This is a meaningful milestone for South Africa’s energy transition and for Mpumalanga’s future as a renewable energy hub. Seriti is proud to be playing a role in building the infrastructure that supports a more secure and sustainable national energy system,” Teke said.
Enabling new renewable energy to enter the grid, the Vunumoya MTS supports national decarbonisation objectives and a more diversified, secure and modern power system. [Photo: Electricity + Control]
Eskom Group Chief Executive, Dan Marokane welcomed the handover, noting the importance of the project in strengthening the national grid to support South Africa’s clean energy trajectory. "This achievement is a clear demonstration of what collaboration and innovation can deliver. It accelerates South Africa’s energy transition and reinforces Eskom’s commitment to a sustainable future. Projects like Vunumoya are vital for modernising our grid and ensuring reliable, low-carbon power for generations to come," Marokane said.
Originally scheduled for commissioning in March 2026, the first phase of the project was accelerated and will deliver energy into the grid from 28 November 2025. The power produced in this first phase will be wheeled to Seriti Resources as part of the mining group’s commitment to decarbonising its operations.
NTCSA CEO, Monde Bala noted the role of the Vunumoya infrastructure in expanding grid capacity and enabling future renewable integration. “The Vunumoya project forms part of the shared public-private sector commitment to enabling the efficient integration of renewable energy projects into the grid, strengthening grid reliability and supporting South Africa’s transition to a diversified, low-carbon energy mix,” he said. “I express sincere gratitude to our partners Seriti Green, the NTCSA teams, the consultants and contractors and all stakeholders for their diligent, efficient execution of the project,” Bala said.
For Seriti Green, the handover of the MTS marks the delivery of a strategic anchor for unlocking large-scale renewable energy supply from one of the most ambitious wind and solar projects under development in the country.
Seriti Green CEO Peter Venn said the energisation of the MTS marks the start of a multi-year renewable energy rollout that will provide long-term benefits for Mpumalanga and the national grid. “The successful energisation of the Vunumoya MTS and the first phase of Ummbila Emoyeni positions one of South Africa’s largest renewable projects for long-term impact. The project shows what coordinated effort can deliver and demonstrates Seriti Green’s commitment to developing clean energy at the scale required for South Africa’s Just Energy Transition,” Venn said.
For more information visit: www.seritigreen.com / www.eskom.co.za / www.ntcsa.co.za