Building the Next Generation of Green Data Centres

Data centres are the backbone of the digital economy, but their rapid growth brings mounting environmental challenges. 

From energy-hungry AI workloads to water-intensive cooling, operators face pressure to cut carbon, conserve resources and design for long-term sustainability. 

The latest wave of green data centre innovation blends clean power sourcing, high-efficiency cooling, heat reuse and low-impact construction, setting new benchmarks for how critical infrastructure can expand while reducing its environmental footprint.

Selecting locations with reliable energy

Sustainability starts at site selection. Leading data centre operators are looking beyond land and latency to grid carbon intensity, interconnection lead-times and access to reliable, clean power.

Hyperscalers are now structuring long-term, location-specific clean-energy deals and, in some cases, securing dedicated low-carbon generation to de-risk growth. 

Data centre operators are flocking to regions with geographical advantages, such as cooler climates and proximity to fresh water supplies. 

Striving for greener efficiency

Right-sizing and right-sourcing power is only half the picture – operators then have to use it efficiently. Power Usage Effectiveness (PUE) remains the workhorse metric, and leaders still squeeze it hard. For instance, Google reported a trailing-twelve-month PUE of 1.09 for Q1 2025 across its global fleet, demonstrating that best-in-class levels are possible at hyperscale even as AI drives density. 

Cooling innovation is another strategic consideration for data centre operators with sustainability in mind. AI clusters push racks well beyond 30–100kW, which makes full- or hybrid-liquid designs the default for new high-density halls. Industry data and market activity show liquid cooling surging: analysts size the liquid-cooling market at about US$4.68bn in 2025 with a CAGR of 19.1% from 2025 to 2034, as direct-to-chip and immersion systems move from pilots to production. 

Beyond efficiency, operators are also rethinking water. Large sites can consume up to 5 million gallons per day if designed around evaporative systems, so designs increasingly emphasise closed-loop liquids, adiabatic-only at extremes, or air-cooled chillers, plus heat-recovery opportunities to lift overall resource efficiency.

Heat reuse is graduating from Nordic niche to mainstream design option. Capturing low-grade server heat for district networks or adjacent loads can materially improve whole-system carbon outcomes and local acceptance. In Finland, Microsoft’s new cluster is expected to provide roughly 40% of Espoo’s district heating when complete – an emblematic, grid-benefiting integration at city scale. 

Building better

Construction and fit-out is another crucial component of the “green equation.” Embodied carbon from concrete, steel and MEP kit is now a board-level KPI. Operators are adopting low-carbon concrete, recycled steel, modular plant skids and circular fit-out practices. 

One recent sustainability report from Prime Data Centers tracked 83% average waste diversion on US construction sites in 2024 and committed to offsetting 120% of operational water use via restoration certificates—evidence that build-phase metrics are being measured and managed in the industry. 

Policy and disclosure are tightening. In Europe, heating and cooling efficiency requirements and waste-heat utilisation targets are sharpening investment cases for heat recovery and higher-temperature loops, while global investors increasingly expect credible pathways on energy, water, materials and biodiversity—reported with hard metrics (PUE, WUE, CFE scores) and verified annually.

Case study: Google

Google’s framework with Brookfield, potentially unlocking up to 3 GW of hydroelectric capacity, marks a new benchmark in green data centre power procurement. 

This long-term hydroelectric power agreement with Brookfield Asset Management and Brookfield Renewable to secure up to 3 GW of carbon-free energy for Google’s data centre operations in the US. 

The Hydro Framework Agreement (HFA), the first of its kind, marks a major move in the digital infrastructure sector’s shift toward reliable, clean energy sources.

The project will focus initially on Brookfield’s Holtwood and Safe Harbor hydroelectric facilities in Pennsylvania. Combined, these assets represent more than US$3bn of energy contracts and 670 MW of generating capacity.

Amanda Peterson Corio, Global Head of Data Center Energy at Google, says: "At Google, we’re dedicated to responsibly growing the digital infrastructure that powers daily life for people, communities and businesses.

"This collaboration with Brookfield is a significant step forward, ensuring clean energy supply in the PJM region where we operate. Hydropower is a proven, low-cost technology, offering dependable, homegrown, carbon-free electricity that creates jobs and builds a stronger grid for all." 

The wider deal gives Google long-term access to electricity from hydroelectric plants that will be relicensed, upgraded or overhauled for continued power generation.

Case study: Microsoft

Microsoft’s data centre deployment in Finland serves as a flagship for urban heat integration: roughly 40% of Fortum’s district heating demand in Espoo, Kauniainen, and Kirkkonummi in Finland can be met via rejected server heat. 

By designing higher-temperature loops and partnering with municipal utilities, the project demonstrates how high-density computing can serve as a local energy asset rather than a burden. 

It transforms waste into a resource, enhances local heating resilience and embeds data centres into the urban energy ecosystem. 

Such symbiosis strengthens community acceptance and supports circular economy goals – special factors that may define future urban-scale digital infrastructure policy strategy.

Case study: Meta

Meta has begun experimenting with sustainably-sourced timber as a primary construction material in its data centres – particularly in offices, support structures and low-load-bearing elements. 

The switch to timber is expected to reduce the embodied carbon of substituted materials by around 41% in administrative buildings, with further reductions possible as the company expands timber use into warehouses and even data halls.

Timber is a carbon-sequestering building material, reducing embodied emissions compared to concrete or steel. 

Meta’s pilot facilities employ cross-laminated timber (CLT) and responsibly harvested wood certified by sustainable forestry programmes. 

In addition to lowering the embodied carbon footprint, timber offers design flexibility, biophilic aesthetics and potential modular construction benefits. 

If these materials prove scalable and meet structural, fire and safety codes, timber could become a viable standard in “green build” strategies for future data centre campuses.