South Africa's major mining companies are stepping up investment in wind and solar power to cut their reliance on Eskom, the national utility long hit by recurring structural difficulties.

South Africa's largest mining companies are stepping up investment in renewable energy to reduce their dependence on Eskom, the state-owned power utility long plagued by recurring structural difficulties. For decades, these companies relied almost exclusively on the national grid, dominated by ageing coal-fired power plants. Scheduled outages weighed on the country's industrial output for several years, before a recovery plan at the state utility significantly reduced the frequency of interruptions. The national power mix nonetheless remains overwhelmingly carbon-based, with the share of renewables still a minority despite steady growth.

Anglo American and Envusa Energy bet on wheeling arrangements

Anglo American opted for an equity partnership model by forming Envusa Energy, a joint venture with EDF Power Solutions dedicated to developing a renewable generation portfolio. Led by chief executive officer Nicole Mason and chaired by Nolitha Fakude, who also chairs Anglo American South Africa, the entity supplies power to the mining group's own subsidiaries as well as other industrial clients. The model relies on wheeling: electricity generated at geographically dispersed wind and solar sites is transmitted through the public grid to mining customers under long-term agreements. Envusa Energy commissioned its Koruson 2 cluster in April 2026, a milestone the joint venture presented as a step toward the group's energy self-sufficiency.

This type of off-grid power purchase arrangement mirrors a global trend already visible in other industrial sectors. In Japan, rail operator JR Kyushu signed its first offsite solar power purchase agreement to supply its high-speed trains. In India, Tata Power commissioned 190.5 MW of firm and dispatchable renewable energy (FDRE) solar capacity in Rajasthan, a configuration designed to limit the intermittency inherent to renewable power. These examples illustrate the diversifying contractual arrangements that industrial players are now using to secure their power supply.

Sibanye-Stillwater and Exxaro pursue distinct paths

Sibanye-Stillwater has taken a different approach, based on purchasing renewable power through supply contracts rather than owning generation assets. The group, led by chief executive officer Richard Stewart, remains heavily dependent on Eskom for its current energy needs but aims for a significant shift toward renewables by the end of the decade, according to its own statements. This asset-light purchasing model echoes that of PowerBank, which acquired 13.9 MW of community solar capacity in New York State rather than building its own power plants. Agreements signed by Sibanye-Stillwater in February 2026 form part of this contractual security strategy.

The group's management presents the strategy as a dual lever, combining a reduced carbon footprint with substantial savings on energy bills, arguing that renewable power is structurally cheaper than Eskom's projected tariffs. It nonetheless stresses that renewable electricity remains intermittent and that battery storage is not yet mature at scale, keeping a lasting need for dispatchable backup capacity supplied by the national utility. Among coal producers, the logic differs somewhat: Exxaro, led by chief executive officer Ben Magara, seeks both to cut its own energy bill and to build a business selling renewable power to third parties, including Eskom itself. Its renewable subsidiary Cennergi, led by managing director Danie du Plessis, inaugurated the Lephalale solar project in July 2026, intended to cover a growing share of the group's mining site needs.

Long-term targets still to be detailed

Exxaro has set a target for net installed renewable capacity by 2030, alongside longer-term emissions reduction goals aimed at carbon neutrality across both its direct emissions and those linked to purchased electricity. Thungela Resources, where Deon Smith serves as chief financial officer, is also among the coal producers engaged in this energy diversification push. None of these groups has yet disclosed a detailed timeline or precise investment figures for their full pipeline of renewable projects.

These distinct trajectories reflect a shared conclusion across South Africa's mining sector: the reliability and cost of power supply directly shape the competitiveness of the extractive industry. Equity joint ventures, power purchase agreements and dedicated renewable subsidiaries now coexist as different responses to the same structural constraint — a national grid still largely dependent on coal. How well each of these models delivers on its respective targets will determine the scale of the energy shift across South Africa's mining sector in the years ahead.