Japan's data center growth is diversifying beyond Tokyo and Osaka.

The growth of data centers in Japan is highly concentrated in the Greater Tokyo and Greater Osaka regions, which together host 90 per cent of the country's data center locations. These areas cover less than 10 per cent of Japan's land mass and face significant seismic risks, so this concentration could lead to catastrophic consequences during an earthquake.

Beyond natural disaster risks, high capital investment and limited land availability in Tokyo and Osaka are driving operators toward decentralisation. Land prices in central Tokyo rose by 69 per cent in 2024, according to a Mordor Intelligence report. Power supply constraints and community pushback, as seen in Koto ward, further limit buildouts in dense urban areas.

**Government initiatives and emerging clusters**

The Japanese government is actively promoting regional diversification of data centers through initiatives such as "Regional Revitalization" and the "Digital Infrastructure Development Plan 2030." These programmes offer assistance for developments outside metropolitan areas and encourage decarbonisation. The government also aims to create five or more data center hubs to foster industrial growth and regional digital transformation.

Emerging data center clusters include Inzai City, which offers municipal incentives and larger land plots and now hosts 10 facilities. SoftBank Group has identified Sakai City and Toyama as potential hubs for large-scale AI data centers. Toyama's Nanto Campus is developing into a digital infrastructure hub with 3.1 GW of power supply.

Hokkaido, with locations such as Sapporo and Ishikari, leverages its cool climate for free air-cooling. Kyushu, positioned as a data center gateway to East Asia, benefits from abundant renewable energy, available land, and direct submarine cable connections. Hyperscalers and AI operators are rapidly developing projects in Kyushu, with cumulative supply projected to reach 3 GW by Q2 2026, up from 101 MW in 2023, according to DC Byte.

**Operational considerations**

While suburban locations offer advantages, they also present challenges, including the need for additional investment in dark fibre routes and redundant substations. These factors can extend project timelines and costs. Despite these hurdles, non-traditional locations are well suited to edge computing and disaster-recovery workloads, offering resilience and operational benefits not available in megacity counterparts.