Coal, Code and Consequences: The Hidden Environmental Cost of South Africa's Data Centre Explosion

The world is building its AI future on data centres — and South Africa, with its coal-dependent grid and water-stressed landscape, is quietly becoming one of its most vulnerable hosts

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South Africa is being courted as Africa’s premier destination for digital infrastructure. Data centres are multiplying. Hyperscale investments are being announced. The promise of becoming a continental AI hub is intoxicating. But behind the headlines and the ribbon-cutting ceremonies lies a set of questions that are not being asked loudly enough: what does this boom cost in coal burned, water consumed, and carbon emitted? And who will bear those costs when the bill eventually arrives? For a country still navigating energy insecurity and deepening water stress, the environmental calculus of the AI revolution deserves far more scrutiny than it is currently receiving.

CONTEXT AND BACKGROUND

South Africa already holds the distinction of having more data centres than any other country on the African continent. According to analysis published by Pinsent Masons, the country’s data centre sector faces a particular set of challenges precisely because its national grid remains heavily dependent on coal-fired generation, making every megawatt consumed by a server farm carry a heavier carbon burden than in countries with cleaner electricity mixes.

The global context makes this more urgent. The World Economic Forum projects that data centres will consume 945 terawatt-hours of electricity by 2030, more than the combined current usage of Germany and France, and over double the amount used in 2024. Through 2030, AI alone may account for over 20 per cent of total electricity demand growth globally, with fossil fuels still supplying roughly 40 per cent of that new demand. For South Africa, where more than a third of national electricity generation still comes from coal-fired power stations, these are not abstract projections.

Plans for new and expanded facilities are accelerating. A proposed 400-megawatt AI data centre in Durban, developed in partnership with a South Korean consortium, would consume an estimated 25 per cent of the city’s electricity supply, according to reporting by TechCentral. Projects of this scale are arriving faster than the regulatory and environmental frameworks needed to govern them.

INSIGHT AND ANALYSIS

Water is where the conversation becomes most alarming and most neglected. Data centres do not only consume electricity — they consume enormous volumes of water for cooling the servers that process every query and store every byte of data. The Irish Times reports that by 2030, global data centre water consumption is projected to exceed 450 million gallons per day, equivalent to the daily usage of approximately five million people. In South Africa, where the Vaal Dam system supplying Gauteng faces persistent pressure, and where certain catchment areas already see power generation accounting for more than a third of local water use, this trajectory carries serious local implications.

The transparency problem compounds everything. Daily Maverick’s investigation into South Africa’s data centre sector found that Eskom and several municipalities refused to provide electricity consumption statistics for local data centres, citing privacy legislation. Several major tech companies do not publish AI-specific figures on energy and water use at all. When governments and regulators cannot access the numbers, they cannot make sound decisions about what infrastructure to approve or what conditions to impose.

There is also a structural inequity at play. Researchers have warned that as wealthier nations face increasing pressure to reduce their domestic carbon footprints, data centre expansion in developing countries could represent a new form of extractivism — one in which the Global South absorbs the land use, energy consumption and emissions associated with powering the digital economy of the Global North. South Africa, positioned as an attractive and stable investment destination by continental standards, must be clear-eyed about what it is agreeing to host and on whose behalf.

IMPLICATIONS

For policymakers, the message is direct: investment attraction cannot be the only measure of success. South Africa urgently needs an environmental framework for data centre development that includes mandatory reporting on water and electricity consumption, binding efficiency standards, and clear requirements for renewable energy procurement. Without these guardrails, the country risks deepening its coal dependency at the very moment its international climate commitments demand the opposite.

For business leaders and investors, the landscape is shifting. Global sustainability reporting standards are tightening, and the reputational and regulatory risks of building carbon-heavy digital infrastructure are growing. South Africa’s data centre sector has a genuine opportunity to lead on transparency and clean energy adoption — but only if it chooses to treat these as strategic priorities rather than compliance burdens.

For ordinary citizens, the stakes are immediate and personal. Water security in Gauteng is not a policy abstraction. The decisions being made now about how data centres are powered and how much water they consume will shape the availability of that water for households and communities for a generation.

CLOSING TAKEAWAY

South Africa’s digital ambitions are legitimate, and the economic case for becoming Africa’s AI infrastructure hub is real. But ambition without accountability is a liability that future generations will inherit. The servers are being switched on across the country, and the environmental ledger is being written, whether or not we choose to read it. Coal does not become clean because it is powering a data centre rather than a factory. Water does not become abundant because it is cooling a server rather than irrigating a field.

For the sake of the children who will live with both the digital economy and its climate consequences, South Africa must insist on transparency, enforce meaningful standards, and refuse to let the promise of investment override the duty of environmental stewardship.

Author Bio: Johan Steyn is a prominent AI thought leader, speaker, and author with a deep understanding of artificial intelligence’s impact on business and society. He is passionate about ethical AI development and its role in shaping a better future. Find out more about Johan’s work at https://www.aiforbusiness.net