Equinix Deploys AI-Optimized Cooling Across 100 Data Centers
- Analysis Cooling & Heat Recovery Data Centers Efficiency & Optimization
Marin Holt
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- 6 minutes read
- Equinix deployed liquid cooling at 100 IBX data centers globally during 2025 commercial rollout
- AI-driven cooling optimization reduced Frankfurt FR6 PUE by 9%, saving 900 MWh annually
- Liquid cooling delivers 150 kW per rack in Hong Kong HK1 — 30x conventional air cooling capacity
- Air-cooled 40 kW cabinets deliver only 28 kW to compute; liquid cooling raises this to 39 kW
- Each 1% efficiency gain on a 100 MW data center saves approximately $1M in annual operating costs
Equinix has deployed liquid cooling capabilities at 100 of its IBX colocation data centers globally, transitioning from pilot programs to commercial-scale operations in 2025 as AI workloads push rack power densities from a traditional 5-10 kW range to 100-150 kW. The company is pursuing an annualized global PUE target of 1.30 or lower, down from its 2023 average of 1.42, with direct-to-chip and two-phase liquid cooling technologies delivering measurable efficiency gains at individual sites.
Critical Perspective
Equinix’s claim of a 9% PUE reduction at its Frankfurt facility, while positive, represents a mere 0.12 PUE point improvement. This is comparable to Digital Realty’s reported PUE of 1.22 at its recent Austin deployment, a metric achieved without the fanfare of a 100-site rollout. The 2019 closure of the 360-megawatt Lakeside Data Center in Australia due to escalating operational costs, including cooling, serves as a stark reminder of the financial realities of large-scale infrastructure. Given the projected 800 MW to 1.5 GW increase in global IT load, how will Equinix manage the substantial capital expenditure and operational complexity of maintaining these advanced cooling systems across its entire portfolio?
Measured Results and Deployments
At its FR6 data center in Frankfurt, Germany, Equinix deployed an AI-based cooling optimization platform from Etalytics that reduced the facility’s PUE by 9%, bringing it closer to 1.2 and saving an estimated 900 MWh per year. In Hong Kong, Equinix partnered with Dell Technologies and Schneider Electric to deploy liquid cooling in its HK1 facility in September 2025, achieving 150 kW of cooling capacity per rack, which is 30 times more than conventional air cooling systems.
Liquid cooling addresses a fundamental efficiency constraint: in a traditional air-cooled 40 kW cabinet, only about 28 kW is available for compute workloads. The same cabinet with liquid cooling can dedicate up to 39 kW to compute, recovering approximately 11 kW that would otherwise be consumed by cooling overhead. At hyperscale, every one percentage point improvement in efficiency on a 100 MW data center translates to roughly $1 million in annual operating cost savings.
Critical Analysis
The shift from 5-10 kW/rack to 100-150 kW/rack AI compute at Equinix’s 100 IBX facilities concentrates switching power supply (SMPS) rectifiers at unprecedented density; each server PSU injects 3rd, 5th, and 7th harmonic currents with THDi 10-18%, and concentrated single-phase SMPS loads cause triplen (3rd, 9th, 15th) harmonics to accumulate in the neutral conductor — neutral current can exceed phase current per IEEE C57.110-2018 derating analysis. Equinix’s PUE improvement from 1.42 to a target 1.30 reduces overhead loss by 8-9% but total IT load continues to rise with AI workload adoption; 100 data centers each increasing IT load by 30% to serve AI racks adds an estimated 800 MW to 1.5 GW globally.
Why It Matters
Cooling accounts for 30-40% of a data center’s total electricity consumption, according to the National Renewable Energy Laboratory. With AI training generating sustained high thermal loads and inference creating rapid load fluctuations, traditional CRAC-based cooling systems cannot maintain both efficiency and thermal stability. Equinix’s phased approach from 2021-2024 testing to 2025 commercial rollout demonstrates that direct-to-chip cooling can reduce site PUE from the 1.4-1.5 range to below 1.2 while supporting rack densities that air cooling cannot physically manage. The European Commission’s Energy Efficiency Directive now requires data center operators to report PUE and related metrics annually, adding regulatory pressure alongside the economic case.
