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The rapid surge in AI demand is driving Japan’s data center development into a brand-new phase. With the soaring performance of GPU servers dedicated to generative AI, the industry is shifting its focus away from traditional air cooling toward liquid cooling systems. This technology has even begun catching the attention of mainstream media, with television specials raising public awareness of what was once a niche data center topic.

Amid this trend, the NTT Group’s massive investments in data center infrastructure are turning heads. Reports indicate that their future investment scale could reach approximately 2 trillion yen, solidifying NTT’s position as a cornerstone of Japan’s domestic AI infrastructure.

A prime example is unfolding in Chiba Prefecture’s Inzai and Shiroi areas. A massive data center project with an estimated total capacity of 200 megawatts (MW) is underway, further cementing the region’s status as a premier next-generation data center hub on the outskirts of Tokyo.

The Shift to Liquid Cooling in the AI Era

The primary driver behind the liquid cooling boom is the sheer power consumption of AI servers. High-performance GPUs generate massive amounts of heat, pushing traditional air-cooling methods to their absolute efficiency limits.

By utilizing cooling fluids to absorb heat directly from the components, liquid cooling systems drastically improve thermal efficiency while curbing overall power consumption. For AI workloads—where improving Power Usage Effectiveness (PUE) is paramount—liquid cooling capability is quickly becoming a standard requirement for upcoming hyperscale data centers.

NTT Group’s strategy, however, goes beyond mere capital expenditure. It represents a broader effort to establish a stable foundation for operating AI infrastructure within Japan by optimizing telecommunications, power supply, and cooling technologies as a single, integrated ecosystem.

This is precisely why regions like Inzai and Shiroi have become so critical. They offer the rare combination of high-capacity power grid access and excellent proximity to the Tokyo metropolitan area.

Community Integration: The New Frontier of Data Center Development

As data center construction accelerates, the industry faces a new challenge: managing relationships with local communities. Because these facilities are massive, concerns often arise regarding their visual impact, noise levels, and heavy energy consumption. Today, tech companies can no longer secure local support through investment alone.

In this context, the comprehensive partnership agreement for regional revitalization signed between Shiroi City and the NTT Group is a landmark move. It highlights a growing shift toward viewing data centers not as isolated fortresses, but as catalysts for local economic growth and industrial revitalization.

This approach is becoming the regulatory norm. In April 2026, the Tokyo Metropolitan Government released its “Guidelines for Data Centers in Harmony with the City,” which explicitly stresses the importance of resident briefings, community dialogue, and environmental consideration. Moving forward, operators will be judged not just by their engineering capabilities, but by how well they coexist with their neighbors.

Furthermore, the Ministry of Economy, Trade and Industry (METI) has incorporated “regional industrial promotion plans centered on data centers” into its Green Transformation (GX) strategy selection criteria. In short, data centers are no longer being treated as mere IT infrastructure—they are being recontextualized as vital pillars tied to local economies and national energy policies.

Data center development in the AI era is evolving. It is no longer just a race for efficiency through liquid cooling; it is a push toward a new generation of infrastructure built on the premise of community symbiosis. The developments in the Shiroi area will undoubtedly serve as a crucial blueprint for the future of the industry.