India’s digital economy is expanding at an unprecedented pace. From cloud computing and online payments to artificial intelligence (AI), nearly every digital service depends on data centres that operate around the clock. As businesses invest heavily in AI infrastructure, the demand for high-performance data centres is rising rapidly.
However, behind this technological growth lies a challenge that often goes unnoticed—water.
Modern AI data centres consume enormous amounts of electricity, but they also require significant quantities of water to keep thousands of servers running safely. With several Indian cities already experiencing water stress, companies are beginning to rethink how they source water for cooling.
One solution gaining attention is seawater desalination. Instead of relying entirely on freshwater from rivers, reservoirs, or groundwater, coastal data centres are exploring whether the ocean can provide a sustainable alternative.
In this article, we’ll explore why cooling is so important, why seawater cannot be used directly, and how desalination could shape the future of India’s data centre industry.
India has emerged as one of the world’s fastest-growing digital markets. Government initiatives, increasing internet penetration, widespread smartphone adoption, cloud computing, and AI investments are driving the construction of large-scale data centres across the country.
According to industry estimates, India’s installed data centre capacity has expanded significantly over the past few years and is expected to continue growing throughout this decade. Cities such as Mumbai, Chennai, Hyderabad, Bengaluru, and Noida have become major data centre hubs because of their connectivity, power infrastructure, and business ecosystem.
The AI revolution has accelerated this trend even further.
Unlike conventional cloud applications, AI workloads require thousands of Graphics Processing Units (GPUs) operating simultaneously. These processors perform billions of calculations every second, generating enormous amounts of heat in the process.
The larger the AI cluster, the greater the cooling requirement.
As a result, cooling has become one of the biggest operational challenges for modern data centres.
Every server inside a data centre produces heat while processing information. When thousands of servers work together continuously, temperatures can rise rapidly.
If this heat isn’t removed efficiently, several problems can occur:
Since AI chips are significantly more powerful than traditional processors, they also generate considerably more heat.
To maintain optimal operating temperatures, data centres use advanced cooling systems that circulate chilled air or water throughout the facility. Among these, water-based evaporative cooling remains one of the most efficient and widely used methods.
In an evaporative cooling system, water absorbs heat from the cooling equipment before being released into cooling towers. As the water evaporates, it carries the heat away, helping maintain safe temperatures inside the facility.
While this approach is highly effective, it comes at a cost—continuous freshwater consumption.
Large AI-focused data centres can consume millions of litres of water every day depending on their size, local climate, and cooling technology.
Water has traditionally not been considered a limiting factor for digital infrastructure. However, this is changing.
Many Indian cities are already facing increasing pressure on freshwater resources due to rapid urbanisation, industrial growth, changing rainfall patterns, and rising temperatures.
Groundwater depletion has become a concern in several metropolitan regions, while prolonged dry seasons and irregular monsoons have made water management more challenging.
As more AI data centres are planned, companies are beginning to evaluate not only electricity availability but also long-term access to reliable water supplies.
This is particularly important because data centres operate continuously throughout the year. Unlike seasonal industries, they cannot reduce operations simply because water availability declines.
For coastal locations such as Mumbai, Chennai, Visakhapatnam, and Jamnagar, the ocean presents an attractive possibility.
Instead of competing with households, agriculture, and industries for limited freshwater resources, data centres could potentially use seawater after appropriate treatment.
However, the solution is not as straightforward as it sounds.
The simple answer is no.
Although seawater is abundant, it contains approximately 3.5% dissolved salts, along with minerals, microorganisms, and other impurities.
If untreated seawater were circulated through cooling equipment, it would create several operational problems.
As water evaporates during cooling, the salt remains behind. Over time, this leads to mineral scaling inside pipes and heat exchangers, reducing cooling efficiency.
Salt also accelerates corrosion, causing expensive metal components to deteriorate much faster than they would with freshwater.
Additionally, warm seawater provides an ideal environment for algae, bacteria, and biofilm formation. These biological deposits can clog pipes, reduce water flow, and increase maintenance requirements.
For facilities that are expected to operate 24/7 with minimal downtime, these issues can become extremely costly.
This is why seawater must first undergo treatment before it can be safely used.
The process of removing dissolved salts from seawater is known as desalination.
Modern desalination plants convert seawater into freshwater suitable for industrial use by separating salt and other dissolved impurities.
Although desalination has existed for decades, advances in membrane technology and energy efficiency have made it increasingly practical for large-scale industrial applications.
Today, desalination supplies drinking water and industrial water across several water-scarce regions, particularly in the Middle East.
For data centres, desalination offers two major benefits:
However, not all desalination technologies work the same way.
MSF is one of the oldest desalination methods. Seawater is heated and passed through multiple low-pressure chambers, where part of it instantly turns into steam. The steam is then condensed into freshwater.
Although highly reliable, this method requires substantial amounts of energy, making it expensive for large-scale deployment.
MED improves efficiency by reusing heat generated during earlier stages of the process.
Instead of repeatedly heating fresh seawater, steam produced in one chamber helps evaporate water in the next. This significantly reduces energy consumption compared to MSF while maintaining consistent output.
Today, reverse osmosis (RO) is the world’s most widely used desalination technology.
In this process, seawater is pumped through ultra-fine membranes under very high pressure. These membranes allow water molecules to pass while blocking dissolved salts and impurities.
Since reverse osmosis doesn’t require boiling water, it consumes much less energy than thermal desalination methods. Although it requires careful pre-treatment to protect the membranes from fouling, its lower operating costs have made it the preferred choice for modern desalination plants.
Although desalination has traditionally been associated with countries like Saudi Arabia, the UAE, and Israel, India is gradually expanding its own desalination capacity to support industries and urban water demand.
One of the biggest reasons is geography. India has a coastline of more than 7,500 kilometres, and many upcoming data centre projects are being planned near coastal cities such as Mumbai, Chennai, Visakhapatnam, and Jamnagar. These locations provide easy access to seawater, making desalination a practical option for industrial cooling.
Several companies have already taken steps in this direction. Reliance, for instance, has operated desalination facilities at its Jamnagar refinery for years and is expected to leverage similar infrastructure for its expanding AI ecosystem. Chennai also has multiple desalination plants that supply water to the city, demonstrating that the technology is already proven in the Indian context.
As AI infrastructure grows larger, developers are increasingly evaluating desalination as a long-term solution rather than relying solely on freshwater resources that are becoming more difficult to secure.
While desalination solves the problem of water availability, it introduces another challenge—cost.
Producing freshwater from seawater is significantly more expensive than drawing water from rivers, lakes, or groundwater. This is because desalination plants require:
Among these factors, electricity represents the largest ongoing expense.
Reverse osmosis, despite being the most energy-efficient desalination technology available today, still requires substantial power to push seawater through specialised membranes at extremely high pressure.
For industries operating at massive scale, even small increases in energy costs can significantly affect operating expenses.
This is why reducing the energy cost of desalination has become a major area of innovation.
The rapid growth of renewable energy may completely change how desalination is viewed in India.
Solar and wind power have become substantially cheaper over the past decade, making renewable electricity increasingly competitive with conventional power sources.
This is particularly relevant because many companies investing in AI infrastructure are also investing heavily in renewable energy.
For example, large business groups such as Reliance and Adani are simultaneously expanding their presence in:
This creates a unique opportunity.
Instead of purchasing expensive electricity from the grid, companies could operate desalination plants using renewable power generated within their own energy ecosystem.
Doing so offers multiple benefits:
As renewable energy continues to become more affordable, desalinated water may also become cheaper, making the technology increasingly attractive for coastal industries.
Although desalination reduces dependence on freshwater, it is not without environmental challenges.
One of the primary concerns is the disposal of brine—a highly concentrated salt solution left behind after freshwater is extracted.
If discharged improperly, brine can increase the salinity of nearby coastal waters, potentially affecting marine ecosystems and aquatic life.
Another concern is energy consumption. While reverse osmosis is more efficient than older thermal technologies, desalination plants still require substantial electricity. If powered by fossil fuels, they can contribute to greenhouse gas emissions.
There is also the issue of marine intake systems. Large desalination facilities draw vast quantities of seawater, which may unintentionally capture small marine organisms if adequate environmental safeguards are not in place.
Fortunately, advances in plant design are helping address many of these concerns. Modern desalination facilities increasingly use energy recovery systems, environmentally responsible intake structures, and carefully managed brine disposal methods to minimise ecological impact.
When combined with renewable energy, desalination can become a considerably more sustainable option than it has been historically.
While desalination is a promising solution for coastal regions, it is not practical for every data centre.
Major technology hubs such as Bengaluru, Hyderabad, Pune, and Noida are located hundreds of kilometres from the coastline. Transporting desalinated water over such long distances would be economically unviable.
Instead, inland facilities are adopting different strategies to reduce water consumption, including:
Many newer facilities are also investing in advanced monitoring systems that optimise cooling performance while minimising water use.
Rather than relying on a single solution, India’s future data centre ecosystem is likely to combine multiple water-saving technologies depending on local conditions.
As India’s digital economy continues to expand, sustainability will become just as important as computing capacity.
Customers, investors, and regulators are increasingly evaluating data centres not only on performance but also on environmental impact. Water efficiency, renewable energy adoption, and carbon emissions are becoming key factors in infrastructure planning.
Future data centres are expected to incorporate a combination of innovations, including:
Rather than treating water as an unlimited resource, operators are beginning to view it as a critical component of long-term infrastructure planning.
This shift reflects a broader trend toward building digital infrastructure that is both technologically advanced and environmentally responsible.
India’s AI revolution is creating unprecedented demand for data centres, but it is also placing new pressure on the country’s water resources. As computing power increases, so does the need for reliable and efficient cooling.
For coastal data centres, seawater desalination offers a compelling solution. Although seawater cannot be used directly because of its salt content, modern desalination technologies—particularly reverse osmosis—make it possible to convert it into water suitable for industrial cooling.
The technology is not without challenges. High energy costs, environmental considerations, and infrastructure investments remain important factors. However, falling renewable energy prices and continued improvements in desalination efficiency are making the economics increasingly favourable.
While inland facilities will continue exploring recycled water and next-generation cooling technologies, desalination could become a key part of the sustainability strategy for coastal data centres.
As India builds the digital infrastructure needed to support AI, cloud computing, and future technologies, balancing technological growth with responsible water management will be essential. Seawater may not be the complete answer to India’s water challenges, but for many coastal data centres, it could become one of the most practical and sustainable solutions.
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