Extraction / Resources and Sovereignty
The State of the Dossier
South32 confirmed on Monday it was evaluating various options regarding its 63.7% stake in the Mozal aluminium smelter in Mozambique, following speculation that South Africa’s Industrial Development Corporation was weighing a buy-out of the facility. The IDC, which holds a 32.48% stake in Mozal, issued a tender on June 10 seeking independent commercial and technical advisers to assess whether it should acquire South32’s controlling stake, facilitate an alternative shareholding structure involving other strategic partners, or sell down its own stake and exit the investment.
The timing is precise. Mozal was placed on care and maintenance on March 15, 2026, following the failure to secure an affordable and sustainable electricity supply contract. The decision came after failed negotiations with Eskom, the Mozambican government, and Mozambique’s leading hydropower group Hidroeléctrica de Cahora Bassa over a new power purchase agreement for 2026.
Why the Energy Deadlock Was Not Resolvable
The economics of the impasse are specific. South32 CEO Graham Kerr explained that the only formal electricity supply offer from Eskom was close to US$100 per megawatt-hour, while outside China fewer than 1% of smelters operate under contracts above US$50. South32 indicated a maximum viable level of US$51 per MWh. The smelter requires 950 MWh to operate 24 hours a day. At double the viable tariff, the gap was structural, not negotiable. The official explanation relates to drought conditions that left HCB’s reservoir with reduced water storage capacity. Kerr said it would likely take at least two years for the reservoir to refill, and then maintenance work would be required, meaning full energy supply was probably two to four years away.
South32 expects to incur one-off costs of approximately US$60 million as well as current annual care and maintenance expenses of approximately US$5 million. The alumina received by Mozal from the Worsley Alumina Refinery has been redirected to third-party customers with sales based on index-linked pricing. The operational architecture of the asset has already been partially dismantled at the supply chain level.
The IDC’s Position and What It Reveals
The IDC does not enter this scenario as an outsider. It already holds a 32.45% equity stake in Mozal, a position it built incrementally by exercising pre-emptive rights to acquire an additional 8.445% from a Mitsubishi-affiliated subsidiary, increasing its holding from a previous position of 24%. This deliberate escalation of ownership, executed even as the smelter’s operational challenges were becoming apparent, signals a long-term conviction in the asset’s underlying industrial value.
Mozal is located about 20km west of Maputo, accounts for around 3% of Mozambique’s GDP and was the country’s single largest industrial private employer, having supported more than 20,000 jobs over the past 25 years. For the IDC, whose mandate is industrial development rather than financial return optimisation, the calculus is different from South32’s. For a development finance institution, the cost of losing industrial capacity permanently is almost always higher than the cost of maintaining it through a cyclical downturn.
The advisory tender closes July 9, 2026. Any decision to restart Mozal will depend on securing a long-term, affordable and sustainable energy supply, with the advisory mandate requiring assessment of interim grid supply arrangements, self-generation, renewable energy and hybrid solutions, wheeling arrangements, and a proposed gas-to-power project adjacent to the smelter.
The South32 Portfolio Logic
South32’s position is the more legible one. South32 has been systematically reorienting its asset portfolio toward operations that align with its long-term capital allocation priorities: higher-margin assets, lower carbon intensity, and commodities positioned for energy transition demand growth. Mozal’s profile creates several tensions within this strategic framework. An aluminium smelter dependent on a hydro-power supply constrained by drought, in a jurisdiction where the energy pricing environment is structurally unfavourable, does not fit that reorientation. Divesting to a development-focused acquirer like the IDC carries an additional reputational dimension for South32: it allows the company to characterise the transition as a responsible handover to an institution better positioned to manage the asset’s long-term industrial mission, rather than a straightforward commercial exit from a troubled operation.
Outgoing South32 CEO Kerr has said it would be very difficult to restart the smelter once it was finally closed. Restarting a smelter after a number of years is not like a mine: the technical challenge is substantial. That statement frames the care and maintenance phase as a finite window, not an open-ended holding position.
The Structural Question the Deal Does Not Resolve
Even if the IDC successfully acquires South32’s stake, the pathway to restarting Mozal involves navigating several interlocking risk dimensions. Without addressing Mozambique’s energy infrastructure constraints and establishing commercially viable power procurement arrangements, a change in Mozal’s ownership architecture does not change its operational economics. The critical question is not whether DFIs should step into these situations. The harder question is whether ownership transfer alone is sufficient to resolve the structural challenges that caused the suspension in the first place.
The Mozal dossier is, in this sense, a proxy for a broader pattern playing out across African industrial assets. Private capital withdraws when the energy infrastructure required to make an operation commercially viable is either absent, unreliable or priced beyond viability. The asset does not disappear. The question of who holds it, at what cost and for what purpose, shifts to state-linked institutions. The IDC’s July 9 advisory tender deadline will determine whether Mozambique retains any realistic pathway to Mozal’s restart, or whether the smelter’s 25 years of operation become a case study in what happens when energy infrastructure fails to keep pace with industrial ambition.