Batam has everything a data centre developer could want: cheap land, a free-trade zone, generous tax treatment and a location just a short ferry ride from Singapore, the region’s digital capital. What it does not have is water to spare. The Indonesian island’s push to become Southeast Asia’s next data centre powerhouse has collided with a basic physical fact — Batam has no rivers of consequence and no natural freshwater sources, and its 1.3 million people depend entirely on rain collected in a handful of artificial reservoirs. When residents of one village found their taps dry for three months while server halls rose nearby, the island’s grand digital ambitions met their first serious public test.
The confrontation came to a head on October 5, when around 300 residents of Bakau Serip village marched on the entrance of Nongsa Digital Park carrying empty bottles and jerry cans. Their message, repeated in interviews since, was stark: not a single drop had come through their taps in three months, and their supply had been reliable until the data centres came. Protesters blocked access roads and demanded to know why facilities cooling the world’s AI models could find water that households could not. It was the third month of protests, following earlier demonstrations in August and September, and it turned a local utility failure into an international story about the hidden costs of the AI boom.
Why Batam, and Why So Fast
Batam’s rise is no accident. Singapore, facing land and power constraints and having imposed a moratorium on new data centres between 2019 and 2022, pushed demand outward, and Batam — along with Malaysia’s Johor — was positioned to catch it. The island’s free-trade status, administered by the agency BP Batam, offers investors streamlined permits and fiscal incentives a short distance from one of the world’s great internet exchanges. Subsea cables already link Batam into regional networks, and Nongsa Digital Park was purpose-built as the landing zone for the industry. For developers serving Singaporean and regional demand, Batam promised Singapore-grade connectivity without Singapore-grade prices.
The money followed quickly. BP Batam has approved ten data centres on the island, six of them inside Nongsa Digital Park, with at least six more applications under review and total investment officially put at more than US$6.7 billion as of mid-2026. Committed projects include a facility by Hong Kong’s Gaw Capital with Indonesian developer Sinar Primera, a planned 450-megawatt campus by Singapore’s DayOne, and a 360-megawatt AI data centre announced in June by Nvidia-backed Firmus, also with DayOne. Official estimates put Batam’s data centre power demand above 1,100 megawatts by 2030.
The Water Underneath the Story
The problem is what data centres drink. Modern facilities use enormous volumes of water to cool the servers and graphics processors that train and run AI systems, and the industry’s standard figures are sobering: a typical data centre consumes around 300,000 gallons of water a day, roughly the usage of a thousand American households, and larger campuses use far more. Indonesia’s environmental forum Walhi has estimated that around ten AI data centres could require some 32 million litres a day — the daily needs of roughly 320,000 people. Batam’s actual facilities do not publish their consumption, which is itself part of the grievance. Residents are being asked to trust that the numbers are small, in a place where every litre is counted by the weather.
Batam’s supply system was fragile before the first server hall was built. The island’s reservoirs — six by most official counts — are filled by rainfall, and a prolonged dry spell this year, possibly linked to a strong El Niño, has drawn levels down sharply. Local environmental group Akar Bhumi Indonesia has simulated that the Nongsa reservoir, which supplies Bakau Serip, could run dry within a month without rain, and its output reportedly fell from around 90 litres per second to 25 during the October drought. Ageing pipes and weak interconnections between reservoir networks mean water cannot easily be moved to where it is needed. In January, the regional ombudsman had already identified 18 water-stressed areas on the island, some receiving water for only a few hours a day.
Drought, Say the Authorities — Diversion, Say the Villagers
BP Batam and the island’s water utility deny that household water is being diverted to data centres, blaming the shortages squarely on the prolonged dry spell. The agency has pointed out that Nongsa Digital Park was promised supply through a dedicated pipeline from the much larger Duriangkang Reservoir, while Bakau Serip depends on the small Nongsa reservoir — a structural separation, officials argue, not a diversion. As an emergency measure, BP Batam has connected Nongsa’s distribution network to Duriangkang, while warning that the fix could reduce pressure and supply hours elsewhere on the island. The utility says it is working to improve supplies but has not publicly addressed whether data centre demand is contributing to the shortage.
The villagers’ counter-argument is about priorities rather than plumbing. From Bakau Serip, the visible facts are dry taps at home and construction cranes at the digital park, and the assurance that the two are unrelated requires a trust that three months without water has exhausted. Their protests have already changed policy: after the August and September demonstrations, Batam authorities instructed data centre developers to build their own seawater desalination plants rather than draw on the island’s freshwater reservoirs. That instruction is a significant precedent. It concedes, in practice, that a rain-dependent island cannot simply allocate its drinking water to the AI industry and hope the weather cooperates.
A Test Case for Asia’s AI Build-Out
Batam is not an outlier; it is an early example of a collision now repeating across the region. Malaysia’s data centre boom has raised the same questions about power grids and water, with a single 300-megawatt facility reported to consume more energy and water than many residential townships. Environmental groups in Indonesia are calling for a moratorium on new data centres until comprehensive rules on water and environmental protection exist. The Indonesia Data Center Ecosystem Council is due to bring operators, regulators and community representatives together in Batam later this month to address power, water and community impact. What is decided there will be watched from Johor to Jakarta, because every government courting AI investment faces the same equation.
So can Batam be Asia’s next data centre powerhouse? The honest answer is that the question has changed. A decade ago it was a question about land, cables and tax breaks, and Batam wins on all three. Today it is a question about whether an island that runs on captured rainwater can host one of the thirstiest industries on Earth without taking water out of its own residents’ taps. Desalination, if the operators actually build it, could square that circle — at a price that will test the economics that drew them to Batam in the first place. The cranes at Nongsa are still moving, and the investment figures are still rising. But the villagers of Bakau Serip, carrying their empty jerry cans, have made sure that the next chapter of Batam’s digital story will be written in water as much as in data.
Source: South China Morning Post
