NTT Data begins work on 200MW Tokyo campus

NTT Data this week announced that work has begun on a new 200MW data centre campus in Japan. The TKY12 campus sits in the Inzai-Shiroi area of Chiba Prefecture, just outside Tokyo.

200MW campus

A few details about the TKY12 development have emerged. It will comprise six data centres in total and sit 20m above sea level. NTT Data is positioning it as a high-density facility for next-generation workloads, with scalable and efficient power and cooling designed for AI.

The site is on stable flatland with low disaster risk, around 60 minutes by rail from central Tokyo and 20 minutes from Narita International Airport. NTT Data has also signed a cooperation agreement with Shiroi City covering local development.

According to various reports, TKY12 will begin Phase 1 service from 2030 or later.

Adjacent campuses

TKY12 is located next to TKY11, a 50MW data centre campus scheduled to enter service in April next year. Ground was broken on a 24MW building for TKY11 in April 2025. Together, TKY11 and TKY12 will bring NTT's total planned footprint in the Inzai-Shiroi area to around 250MW.

Momentum is building for new AI-ready data centres in Japan. NTT Data's wider pipeline now extends beyond Chiba, with a 100MW campus planned in Tochigi and another announced in Osaka, taking its total announced Japan footprint past 400MW.

Announcements of new data centres have been relatively muted overall, but this is likely a reflection of the longer lead times involved in building there. Securing utility-grade power often takes years in Japan, and TKY12's first phase likely remains conditional on that connection.