South Africa’s rooftop solar boom has created another opportunity that extends beyond keeping the lights on at home. Thousands of residential battery systems are now being connected into what could become Africa’s largest virtual power plant.
Energy technology company Plentify has partnered with inverter manufacturer Deye to connect more than 160,000 residential battery systems, creating a combined 2.7 GWh of controllable storage through Plentify’s virtual power plant (VPP) platform. Unlike a conventional power station, a virtual power plant does not generate electricity from one location. Instead, software coordinates thousands of distributed batteries, charging them when electricity is plentiful and discharging them when demand on the grid increases. Together, these individual systems behave like a single flexible energy resource.
The scale is significant. The planned virtual power plant represents almost double the storage capacity of Eskom’s 1.4 GWh battery programme, but without building a single new utility-scale battery installation. Instead, it makes use of batteries that homeowners have already installed. The platform can also integrate Plentify’s smart water-heating technology, allowing electric geysers to shift electricity consumption away from peak demand periods. Combining battery storage with flexible household appliances gives the system even greater ability to support the grid.
For homeowners, participation creates an opportunity to earn additional income from equipment they already own. Plentify estimates participating households could receive around R1,000 to R2,000 per year, depending on how their systems are used. For South Africa’s electricity system, however, the benefits extend far beyond household earnings.
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As rooftop solar continues to expand, managing when electricity is stored and consumed becomes increasingly important. Coordinated residential batteries can reduce pressure during evening peaks, absorb excess daytime solar generation, and delay expensive investments in new transmission and distribution infrastructure. The partnership also signals a broader shift in how electricity systems are evolving. Instead of relying solely on large centralised power stations, utilities are beginning to view homes, businesses and distributed energy resources as active participants in balancing the grid.
South Africa’s residential solar market has already become one of the fastest-growing in Africa. The next phase of that transition may not be about installing more batteries, but about connecting the ones already sitting in garages and utility rooms into a coordinated energy network capable of supporting the national grid.
