Japan Explores Underground Data Centers Under Tokyo Metro to Address Urban Infrastructure Challenges
Japan is actively investigating the feasibility of constructing data centers beneath sections of the Tokyo Metro, as part of a strategic initiative to overcome space and infrastructure limitations driven by escalating data demand. A consortium comprising four companies from the Tokyu Group has unveiled plans to install a modular data center under an elevated segment of the Oimachi Line, with the trial set to commence in June 2026. This pilot project aims to assess whether such compact server setups can function reliably within the dynamic environment of active railway systems.
Tokyo's Data Center Market Faces Severe Infrastructure Constraints
The trial emerges against a backdrop of significant infrastructure challenges in Tokyo's data center sector. According to Yasuo Suzuki of NTT Global Data Centers, power grid connection wait times in central Tokyo can extend from five to ten years, as reported last year. Additionally, Mordor Intelligence highlights that land costs in Japan have surged, with prices in Tokyo experiencing a staggering 69% increase in 2024. Currently, Tokyo hosts 132 operational data centers, with at least 18 more under construction. Medium-sized facilities are projected to grow at a compound annual growth rate of 12% through 2031, as they offer a more deployable solution in space-constrained urban areas compared to larger counterparts.
Objectives and Methodology of the Underground Data Center Trial
The primary goal of this trial is to evaluate the performance of compact server infrastructure under active railway overpasses, where factors such as vibrations, noise, and temperature fluctuations are prevalent. The modular unit will integrate servers, cooling systems, and a power supply into a container-sized enclosure, enabling installation without the need for constructing an entire building. Tokyu Electric Railway will provide the land for the project, Tokyu Construction will handle the building of the unit, and It's Communications will connect it to the existing fiber-optic cables that run along the railway lines.
During the trial period, the consortium will meticulously assess various critical factors, including sound insulation, thermal performance, vibration isolation, and cooling efficiency under real-world railway conditions. The findings from this evaluation will be analyzed to determine the potential for scaling and deploying this model at other locations across the extensive Tokyu network.
Leveraging Existing Infrastructure for Enhanced Efficiency
A key advantage in this initiative is the utilization of the pre-existing optical fiber network developed by It's Communications Corporation along Tokyu's rail lines. By connecting directly to this current network infrastructure, the under-track data centers can bypass the need for laying new fiber connections, thereby reducing costs and accelerating deployment timelines. The consortium has also indicated that it is exploring opportunities to expand similar deployments across the broader Tokyu Line network, including high-traffic areas like Shibuya, as part of a comprehensive long-term digital infrastructure strategy.
