A multi-gigawatt data center campus is being planned in central Japan.

Announced late last year, Nanto City and data center firm GigaStream Toyama are planning to develop a large-scale cluster known as the Nanto Campus.

The site, located on land outside Toyama within Nanto City, will reportedly support up to 3.1GW upon completion.

The Nanto City Council has approved the sale of approximately 13.1 hectares of city-owned land for Phase I of the project to GigaStream Toyama, which will be able to support approximately 400MW of capacity.

Renders suggest two-buildings are planned in the first phase. Nanto City said construction could begin in spring 2026 or later, with operations targeted to begin in 2028.

Nanto is a city in Toyama Prefecture, located southwest of Toyama city, close to the north coast in the center of the country. It was established in 2004 through the merger of eight towns and villages.

Founded last year, GigaStream Toyama describes itself as a developer specializing in the development of industrial parks for data centers, offering development-ready land to data center operators through sale or lease. This is the firm's debut project. Details on how the project would be funded haven't been shared.

Nanto City Mayor Mikio Tanaka said: "Through the agreement with GigaStream Toyama K.K., we will work with full commitment toward the success of this project so that it contributes to the further development of our city by creating new industrial and employment opportunities. We will also carefully address challenges one by one and provide support so that Nanto City and Toyama Prefecture become major hubs of next-generation digital infrastructure."

Daniel Cox, founder & representative director, GigaStream Toyama, added: "The decentralization of data centers has been an issue for more than ten years, and we are honored to be able to present the answer today through our cooperation with the people of Nanto City. By building a 3.1GW data center cluster, we will create a new industry in Toyama Prefecture with local companies playing the leading role. We will devote our full efforts to providing new employment opportunities for Toyama residents and attracting global companies to the prefecture."

Alongside Cox, Daniel Kesler is listed as a co-founder of Gigastream. Kesler last year also founded Raiden, a Japanese data center developer, and has previously worked at several investment firms. Both Daniels were previously at Digital Garden Tokyo, a digital infrastructure events company.