South Africa’s Energy Crisis: Rooftop Solar vs. Data Centers

Author: Carlos Albero Rojas

For nearly a decade, South Africa faced rolling blackouts that its state utility, Eskom, could not resolve. In response, many businesses and homeowners opted for rooftop solar, shifting installed capacity from about 2,260 megawatts in 2022 to around 7,300 megawatts by late 2025 — without any government mandate.

A Decade of Darkness

Load shedding began in earnest in 2007, pushing citizens to work around scheduled blackouts. Eskom struggled to maintain its aging coal fleet, prompting the private sector to invest in solar energy for economic survival. This transition was mainly driven by economic necessity rather than subsidies or regulatory frameworks, making it one of the most market-driven shifts in energy generation.

Growing Demand from Data Centers

South Africa has become a hub for data centers, responsible for about 1% of the world’s AI capacity, with plans for significant expansion due to the growing demand for AI technologies. Approximately $1.5 billion in new data center projects are underway, which poses a challenge to the grid that only recently stabilized.

Competing Demands: Data Centers vs. Small Businesses

The largest data center operators are not just relying on the existing grid; some are investing in their own energy generation. For instance, Teraco is constructing a 120 MW solar facility. While this investment appears beneficial, smaller businesses and households are struggling against a backdrop of rising electricity costs and increasing compliance requirements.

Rooftop Solar: A Stranded Asset?

A recent study indicates that cities like Johannesburg and Tshwane have considerable rooftop solar capacity, with many systems producing excess electricity. However, municipal policies hinder the ability of these systems to contribute effectively to the grid. Instead of integrating this surplus into the grid, municipalities impose stricter tariffs, making it financially unsustainable for smaller energy producers.

Policy Choices with Broader Implications

South Africa is at a crossroads. The outcome of its energy policy choices—whether to integrate distributed energy generation or to restrict it through punitive measures—will likely serve as a model for other regions facing similar challenges. If South Africa can balance the needs of its burgeoning data center market with the contributions of its solar community, it may lead the way in sustainable energy practices. However, failure to do so risks repeating the instability of its past energy crisis.

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