Diesel Shock Exposes South Africa's Fuel Fragility Arabian Post

South Africa's dependence has deepened because domestic refining capacity has shrunk. The country once relied on a broader base of refineries to process crude oil locally, but closures, fires, maintenance shutdowns and ageing infrastructure have shifted the supply model towards finished petroleum imports. Refining capacity has fallen by roughly half over several years, leaving the country with fewer buffers when global supply routes are disrupted.

The Middle East has become a particularly important source of diesel. It accounted for around two-thirds of South Africa's diesel imports in 2024 and about 80% last year. That concentration left the country exposed when Iran's actions around Hormuz strained tanker traffic and raised freight, insurance and replacement costs. The issue is not only whether ships can reach South African ports, but whether buyers with deeper pockets can outbid import-dependent economies for scarce cargoes.

Government has tried to cushion households and businesses through fuel levy relief. Petrol and diesel levy cuts were extended into May, with diesel receiving additional relief that temporarily reduced its general fuel levy to zero. The measure softened the full price shock but did not prevent steep increases. The official May adjustment lifted petrol by R3.27 a litre and diesel by R6.19 a litre, taking wholesale diesel above the R30-a-litre mark in parts of the market.

The fiscal cost is significant. Temporary levy relief from April to June is estimated at more than R17bn in foregone revenue. Treasury has said the measure will be funded without changing the fiscal framework, but the space for repeated intervention is limited. Relief is due to be halved in June and phased out by July, meaning households and firms could again face sharper pass-through if global prices remain elevated.

For South Africa's economy, diesel is also tied to electricity security. Years of power cuts pushed businesses, hospitals, retailers, farms and households towards generators. Even as power supply stabilised in parts of 2025 and 2026, the installed generator base remains large. When grid uncertainty returns, diesel demand rises quickly, adding pressure to import needs and foreign exchange outflows.

Mining companies are also exposed. Diesel powers haul trucks, drilling equipment and support fleets across platinum, coal, iron ore and gold operations. Higher diesel costs squeeze margins, especially where global commodity prices are weak or rail bottlenecks force greater reliance on road haulage. The same pressure affects farmers, whose planting, harvesting and irrigation costs are sensitive to fuel prices.

The logistics sector faces one of the most immediate strains. South Africa's rail underperformance has pushed freight onto roads, increasing diesel consumption and raising the cost of moving goods between ports, inland markets and neighbouring countries. Any prolonged spike in diesel prices risks feeding into food inflation and manufactured goods prices, particularly for low-income households already carrying high transport and electricity costs.