As high-density and AI-driven workloads accelerate, sustainable data centres are entering a far more complex phase. Kevin Laugo, Senior Sustainability Engineer at Black & White Engineering, examines how rising power density, regulatory pressure and climate considerations are forcing a more integrated approach to design.
Balancing Energy Performance with Water Use
Power and water, once treated as separate design considerations, are now deeply interconnected. With global electricity demand from data centres forecast to double by 2030, operators face growing pressure to reduce environmental impact while maintaining resilience and performance.
Across markets, tighter efficiency regulations are shaping design decisions. Germany’s mandated Power Usage Effectiveness (PUE) target of 1.2 is one example of how energy efficiency has moved from best practice to baseline expectation. Yet lowering PUE often comes with an unintended consequence: increased water consumption. Evaporative cooling strategies may reduce electrical load, but they can significantly worsen Water Usage Effectiveness (WUE). The challenge is no longer achieving the lowest PUE at any cost, but finding the right balance between energy and water.
Why Sustainability Requires a System-Level View
True efficiency cannot be delivered through isolated upgrades or single metrics. Sustainable data centre design demands an integrated, system-level approach that considers how power, cooling and water interact across the full lifecycle of the facility.
Several technical strategies are already shaping this next phase of sustainability:
Liquid cooling is becoming essential for high-density environments. Technologies such as direct-to-chip and immersion cooling remove heat more efficiently at source, reducing reliance on large volumes of air movement and lowering overall energy demand. When designed correctly, these systems can also reduce water intensity compared to traditional evaporative approaches.
Smarter water management is equally critical. Increasing cycles of concentration (COC) in cooling systems and using reclaimed or non-potable water sources can significantly improve WUE without compromising operational reliability.
Waste heat reuse offers another opportunity to extend efficiency beyond the data centre boundary. Capturing and exporting heat to industrial processes or district heating networks improves overall energy performance and supports wider decarbonisation goals.
Bring-Your-Own-Power: A Shift in Control
A growing trend reshaping sustainability strategies is Bring-Your-Own-Power (BYOP). By investing in on-site generation, such as fuel cells, microgrids or hybrid energy systems, operators gain greater control over both carbon and water impacts.
BYOP enables the direct deployment of lower-carbon or carbon-free energy sources, accelerating decarbonisation. Just as importantly, it reduces exposure to the significant indirect water consumption associated with centralised power generation, whether from gas, coal or nuclear plants. When water use is considered holistically, including both on-site and off-site impacts, BYOP becomes a powerful lever for achieving meaningful environmental outcomes.
Designing for What Comes Next
The future of sustainable data centres will not be defined by a single metric. It will be shaped by integrated engineering decisions that balance power efficiency, water stewardship and long-term resilience. As demand continues to rise, those who adopt a holistic, data-driven approach will be best positioned to meet regulatory, operational and environmental expectations.
If you’d like to explore how integrated power and water strategies could shape your next sustainable data centre project, get in touch with our team via the contact page to continue the conversation.