Source: The Economic Times
Introduction
The intensifying debate over resource allocation in India’s rapidly growing digital infrastructure sector has reached a critical juncture. As hyperscale data centres expand to meet the demands of an AI-driven economy, critics have raised alarms regarding their water consumption. However, industry experts are urging policymakers to move beyond public outcry and embrace a more sophisticated approach: to treat, not trick, data centre water usage.
The controversy often stems from a fundamental misunderstanding of the water cycle within industrial processes. By prioritizing the utilization of treated wastewater rather than potable supplies, data centres could actually alleviate municipal water stress rather than exacerbate it. This paradigm shift requires a shift in public perception and a move toward data-driven, transparent policy frameworks.
What Happened
A recent municipal proposal to supply treated sewage to a major hyperscale data centre in an Indian metro area triggered significant public backlash. Protesters argued that a city facing a 30 million litres per day (MLD) shortfall in drinking water should not divert any resources toward servers. The protest garnered headlines, framing the transaction as a diversion of precious potable water, despite the fact that the 12 MLD designated for the facility consisted entirely of treated effluent.
This situation highlights a recurring disconnect between public sentiment and engineering reality. The water intended for the data centre was never part of the potable supply chain. By failing to utilize this treated sewage, cities often allow it to flow unmonitored into rivers and oceans, representing a missed opportunity to turn a disposal liability into a sustainable industrial revenue stream.
Background
The concept of repurposing treated wastewater is not new. In 2002, Singapore’s then-Prime Minister Goh Chok Tong famously consumed a bottle of NEWater—recycled sewage treated through microfiltration, reverse osmosis, and ultraviolet disinfection—to prove its safety. While the water exceeds World Health Organization standards, it is primarily used in wafer fabrication plants, where semiconductor manufacturing requires water purity levels far exceeding those necessary for human consumption.
In India, the scale of untapped resources is substantial. According to Central Pollution Control Board data from March 2021, urban India generates over 72,000 MLD of sewage, yet less than 30% undergoes treatment. The majority of this water is currently discharged into natural water bodies, un-priced and essentially wasted. Integrating this supply into industrial cooling loops presents a viable path toward sustainable digital growth.
Timeline and Key Statistics
| Metric | Data Point |
|---|---|
| Urban India Daily Sewage Generation | 72,368 MLD (March 2021) |
| Urban India Daily Treated Sewage | 20,000 MLD (March 2021) |
| Projected Data Centre Capacity (2024) | 1,352 MW |
| Projected Data Centre Capacity (2030) | 8,318 MW (High-growth case) |
| Hypothetical 2030 Water Demand | 163 billion litres |
| Thermal Power Water Permissibility | 2.5–3.5 m3 per MWh |
Impact
The environmental impact of data centres is often miscalculated in the public imagination. While projections suggest that high-growth scenarios could see water demand reach 163 billion litres by 2030, this remains a fraction of India’s annual water consumption. Agriculture currently accounts for more than 80% of the nation’s total water usage. Furthermore, global operators are increasingly efficient, with some reporting fleet-wide Water Usage Effectiveness (WUE) metrics as low as 0.12, far below the theoretical maximums often cited by critics.
Restricting access to treated water for data centres creates a paradoxical outcome. If forced to abandon evaporative cooling methods—which utilize treated effluent—these facilities must shift to dry chillers. This transition can increase electricity consumption by 10% to 65%. Given that India’s power grid remains heavily reliant on thermal energy, this increased electricity demand ultimately leads to a higher total water footprint for the nation.
What Happens Next
To move forward, municipal councils and national regulators must prioritize enforceable reuse policies. The national framework established in 2022, building on foundations like Gujarat’s 2018 policy, provides the necessary roadmap. Policymakers should focus on mandating the use of treated water for industries capable of absorbing it, including construction, textiles, and thermal power stations.
Transparency is the final requirement for public trust. By metering offtake, requiring public disclosure of WUE metrics at the time of project sanction, and creating tiered water pricing, the government can incentivize efficiency. When treated water is priced significantly lower than potable supplies, the economic incentive naturally aligns with environmental goals. As history has shown, whether in Singapore or India, the primary obstacle is rarely technical feasibility; it is the need for a more informed, argument-driven approach to resource management.
