Sustainable Data Centre Design: Key Strategies to Reduce Power Consumption

Modern data centres use a huge amount of electricity, particularly in cloud and AI environments where systems run continuously at high density. In some cases, the consumption of a single large facility is as much power as a small city.

Because of this, power management now plays a much larger role in how modern sustainable data centre facilities are designed and run. Alongside uptime and performance, there is now much more focus on data centre energy usage and how facilities will support growing demand.

Why Sustainability Matters in Modern Data Centres

Energy use affects more than the daily running cost of a facility. As workloads increase, power and cooling systems are expected to support higher demand without increasing energy consumption at the same pace. That has made sustainable development a much bigger part of infrastructure planning than it was a few years ago. Cooling, airflow, power distribution, and monitoring all affect how much energy is needed to keep systems running steadily.

This is also changing how enterprises evaluate infrastructure providers. Many organisations now look more closely at renewable energy usage, emissions, cooling systems, and long-term environmental targets before choosing a green data centre provider.

At STT GDC India, these considerations are part of how facilities are planned and operated from the beginning. This includes renewable energy adoption, green IT infrastructure, cooling systems, and longer-term goals around carbon neutrality.

These efforts are guided by a structured sustainability roadmap that includes renewable energy adoption, resource efficiency improvements and a commitment to achieving carbon-neutral operations by 2030.

Intelligent Cooling Systems: Reducing Energy Waste

Older cooling setups often operated at fixed capacities regardless of how much cooling was actually needed at a given time. This can lead to unnecessary energy usage in lower-density environments.

In newer facilities, that approach is changing. Cooling systems are now designed to respond to actual heat generation across racks and workloads. Different cooling systems support different density requirements, whether that involves air-cooled chillers, rear door heat exchangers, or direct-to-chip liquid cooling. Although the technologies differ, they are all designed to deliver cooling where it is needed instead of cooling the entire floor evenly, which is one of the more effective ways to lower energy usage in data centres.

In cooling infrastructures, the use of water is another factor that often gets overlooked. In warmer regions, cooling systems can run almost continuously and use large amounts of water over time. As a result, several facilities invest heavily in water reuse and recovery systems, such as rainwater harvesting, treated wastewater reuse, and water recycling. These efforts help reduce dependence on freshwater sources.

Such measures are visible across newer facilities being developed by us at STT GDC India. Our company’s Water Usage Effectiveness (WUE) improved from 1.34 litres per kWh in FY21 to 0.58 litres per kWh in FY25, while STT Bengaluru 3 became the first data centre in India to receive both IGBC Net Zero Water and IGBC Net Zero Energy certifications.

Optimised Power Management and Infrastructure Efficiency

Power consumption is influenced by more than cooling alone. The way electricity is distributed and used across the facility also affects how much energy a data centre consumes over time.

Here is where Power Usage Effectiveness (PUE) becomes important. It helps show whether electricity is being used mainly by the IT equipment or whether supporting systems are consuming more than expected. When that number starts increasing, it usually means certain systems are using more energy than expected. Understanding these patterns is an important part of how to reduce power consumption in data centres.

When teams can see where electricity use is starting to increase, they can often identify inefficiencies much earlier. In newer environments, monitoring is not limited to overall power readings. Teams also track individual systems, cooling infrastructure, and equipment rows, since increases in one area do not always appear immediately at the facility level. Over time, they can understand these patterns and make adjustments and regular energy audits before larger parts of the facility are affected.

At STT GDC India, all new facilities are designed to operate below a PUE of 1.5, while existing facilities have also improved energy efficiency by 3.4% since FY21.

Renewable energy is also becoming a larger part of long-term infrastructure planning. STT GDC India’s Renewable Energy Factor (REF) reached 70%, rising from 31.8% in FY21 through a mix of green tariffs, Energy Attribute Certificate and wind and solar Power Purchase Agreements. Over the same period, carbon intensity reduced by 52% against the FY21 baseline. You can read more about the same in our ESG Report.

Intelligent Design for Long-Term Sustainability

A lot of what affects long-term sustainability is decided early, well before a facility goes live.

Things like cooling layout, airflow, power distribution, water usage, and monitoring systems continue to influence how much energy a data centre uses years later. Making changes becomes harder once the core infrastructure is in place.

Because of this, newer facilities are being planned using more sustainable data centre design strategies that account for how workloads are expected to grow over time. Site selection now involves looking at factors such as renewable energy access, water availability, local climate conditions, and surrounding infrastructure, since all of these can affect long-term power and cooling requirements.

Inside the facility, these decisions also affect day-to-day operations. Layouts are planned more carefully from the start using eco-friendly data centre design methods that can support future demand more efficiently.

Data centre sustainability expectations are also influencing how enterprises evaluate infrastructure providers, particularly in large cloud and AI environments.

For STT GDC India, this has led to continued investment across monitoring infrastructure, cooling systems, renewable energy sourcing, and long-term operational planning.

There is also a practical overlap between sustainability and AI readiness. Many of the systems now being adopted to reduce energy usage, such as advanced cooling and power monitoring, are also among the most widely used power optimization techniques for data centres and are needed to support higher-density AI workloads reliably over longer periods.

How Sustainable Data Centres Create Business Value

Sustainability has evolved from a compliance requirement into a business imperative. As digital infrastructure demand continues to rise, sustainable data centres can deliver measurable value across operational, financial and strategic dimensions.

• Lower operating costs: Energy-efficient cooling and power systems reduce overall electricity consumption and improve infrastructure efficiency.

• Reduced carbon footprint: Renewable energy adoption and efficiency initiatives help organisations advance their ESG goals. At STT GDC India, carbon intensity has reduced by 51.8% since FY21, while the Renewable Energy Factor increased to 70% in FY25 till date.

• Improved resource efficiency: Advanced cooling and water management strategies help conserve critical resources. STT GDC India's Water Usage Effectiveness (WUE) improved from 1.34 litres/kWh in FY21 to 0.58 litres/kWh in FY25.

• AI-ready infrastructure: Intelligent cooling and power management systems support high-density AI workloads while maintaining operational efficiency.

• Future-ready operations: Sustainable facilities help organisations strengthen resilience and prepare for evolving regulatory and stakeholder expectations.

As digital transformation accelerates, sustainable data centres are becoming a strategic enabler of operational efficiency, ESG performance and long-term business growth.

What This Means Going Forward

Demand for digital infrastructure continues to grow, but simply adding more power and cooling is no longer enough. Facilities are expected to support larger workloads while better utilising the resources available to them. Hence, sustainable data centre design receives considerable attention across the industry. Decisions around cooling, power management, monitoring, water use, and renewable energy all influence how efficiently a facility operates over time.

The most effective ways to reduce data centre power consumption are often built into the infrastructure itself. When these decisions are made early, facilities are better positioned to support future demand while using energy, water, and cooling resources more responsibly.

At STT GDC India, a holistic approach to sustainability extends across data centre operations. Stay tuned for the next blog, where we explore the best practices shaping more sustainable, resilient and efficient operations.