Over the past decade, West London has become one of the UK’s fastest-growing hubs for data centres. Once home to light industry and logistics, areas like Slough, Park Royal, and Hayes are now dotted with anonymous grey buildings that house the digital infrastructure powering everything from AI models to banking apps.
However, as demand for data increases, so does the pressure on local energy supplies — and on the ability of these facilities to remain cool.
According to the Greater London Authority, new data centre developments across the capital are being scrutinised for their impact on energy capacity. Last year, parts of West London were effectively paused for new large-scale electrical connections, affecting proposed builds in data-intensive sectors. While some restrictions have since eased, energy availability remains a key concern for planners and operators alike.
The issue isn’t just about electricity. It’s also about heat.
A New Kind of Local Pressure
Unlike office buildings or housing developments, data centres don’t run hot just during summer spikes — they generate heat constantly. The rise of high-performance computing and AI workloads means today’s facilities must process more data, more quickly, with more hardware packed into every square metre.
Cooling that infrastructure has traditionally relied on air-based systems, but these are becoming harder to justify. Air cooling consumes considerable energy, requires large physical ducting, and struggles to keep up with dense server deployments.
This increased heat load and energy draw from high-density data centres has prompted concern from both local councils and environmental groups, who argue that inefficient cooling strategies risk adding to London’s energy burden while undermining sustainability targets.
Planning Meets Practicality
Ealing, Hillingdon and Slough councils have all raised questions about the energy impact in recent planning consultations for data centre developments. In some cases, developers have been asked to provide detailed modelling of not just electrical draw, but thermal management.
“Cooling is the bottleneck,” says one data centre engineer working in the Slough Trading Estate. “We can get the hardware in. We can even get the power in, if we wait. But if we can’t cool it efficiently, the build won’t go ahead.”
With AI and machine learning driving new workloads, this pressure is only increasing. Chatbots, recommendation engines, and real-time analytics systems all require low-latency infrastructure — which in turn requires more local data handling, closer to the end user.
That’s pushing developers toward higher-density builds, but also more efficient cooling solutions.
A Shift Toward Liquid Cooling
One solution gaining traction is liquid cooling. Already used in high-performance computing and research environments, liquid cooling is now being adopted in commercial data centres where thermal limits are more challenging to manage.
Unlike traditional air-based systems, liquid cooling brings chilled fluid directly to components such as CPUs and GPUs. This solution allows more heat to be removed in a smaller space, with less energy consumption overall.
Operators are turning to new cooling methods such as liquid cooling solutions, which reduce heat without the energy load of traditional HVAC setups. These systems are particularly well-suited to AI-focused racks, where power densities exceed what fans and airflow can handle alone.
What This Means for London
For London’s tech sector, the implications are twofold. First, future infrastructure growth may depend as much on cooling technology as on connectivity or location. Second, energy-efficient design will likely become a planning requirement rather than a competitive bonus.
Some operators are exploring mixed-use energy recovery models — for example, using server waste heat to warm nearby residential blocks or public facilities. Others are investing in modular, liquid-cooled server pods to minimise footprint and cut energy draw.
With electricity prices high and environmental, social, and governance (ESG) commitments tightening, infrastructure design is no longer a background concern. It’s central to how London will manage the next decade of digital growth.
Whether you’re a data centre developer, a business running compute-heavy workloads, or simply a London resident concerned about infrastructure strain, cooling is no longer just a technical detail — it’s part of the city’s energy future.
Feature image by TheDigitalArtist on Pixabay
