Inzai Campus Building 3 (NRT14) | Secure Hyperscale Cloud & Interconnection Hub

Status: Nearing Completion / Commissioning (Dec 2025)   |   Location: Inzai City, Chiba Prefecture (Greater Tokyo), Japan

Project Overview

The NRT14 Data Center, located in the Inzai cluster of Chiba Prefecture, Japan, marks a pivotal moment for Digital Realty and its joint venture partner, Mitsubishi Corporation. As the third facility on the massive NRT campus, NRT14 has been specifically fast-tracked to meet the explosive demand for Generative AI and high-performance computing (HPC) in the Asia-Pacific region. With its official commissioning in December 2025, it solidifies Inzai’s status as one of the premier data center hubs globally, often referred to as the "Data Center Capital of Japan."

What distinguishes NRT14 from its predecessors (NRT10 and NRT12) is its "AI-First" architecture. While typical hyperscale facilities are built for general-purpose cloud workloads, NRT14 is engineered to handle the thermal and electrical intensities of modern GPUs. The facility supports rack densities of up to 70 kW per rack, a necessity for NVIDIA’s Blackwell and H200 clusters. To achieve this, MC Digital Realty has implemented an innovative Air-Assisted Liquid Cooling (AALC) system. This hybrid approach allows customers to transition seamlessly from traditional air cooling to direct-to-chip liquid cooling without requiring a total overhaul of their hardware.

The facility adds 31 MW of IT capacity, bringing the total campus power to a formidable 104 MW. This scale is critical for "Sovereign AI"—Japan’s national initiative to build and host AI models domestically to ensure data privacy and cultural alignment. By housing these workloads within NRT14, Japanese enterprises can leverage the ServiceFabric™ orchestration platform, which allows them to connect their private AI infrastructure directly to major public clouds like AWS, Azure, and Google Cloud with ultra-low latency.

Sustainability is another cornerstone of the NRT14 project. In alignment with Japan’s 2050 carbon neutrality goal, the facility is powered by 100% renewable energy. The cooling systems are optimized to reduce Water Usage Effectiveness (WUE), a vital metric in Japan’s resource-conscious regulatory environment. Furthermore, the building incorporates world-leading seismic isolation technology, ensuring that even in the event of major tectonic activity—a constant concern in Japan—the critical AI workloads remain online.

Economically, NRT14 leverages Inzai's unique geography. Located far enough from central Tokyo to avoid high land costs and seismic congestion, but close enough to serve the 37 million people in the Greater Tokyo Area, it provides the perfect "Edge of Hyperscale" location. The project has not only boosted local employment in Chiba but has also attracted a suite of international managed service providers and network carriers, further enriching the local digital ecosystem. As of late December 2025, NRT14 stands as the most advanced operating AI data center in the Japanese market.

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