AirTrunk has started the latest phase of expansion work at one of its data center campuses in Tokyo, Japan.

The company this week announced it has broken ground on a new 40MW phase at its TOK1 campus.

Set to offer more than 300MW total capacity at full build-out, AirTrunk bills TOK1 as Japan’s largest hyperscale data center campus.

A traditional Jichinsai Shinto groundbreaking ceremony was held to bless the land and ensure safe, successful construction.

The ceremony was attended by AirTrunk’s country head in Japan, Nori Matsushita, and chief development officer Paul Slaven, alongside partners in construction, design, and power infrastructure.

Announced in September 2020, the initial phase of TOK1 was delivered in only 45 weeks and launched in November 2021. The company started work on the third phase, adding a 55MW building, in June 2023.

Located in Inzai, Chiba Prefecture, the 13.25-hectare site is scalable up to 300MW across seven buildings.

The campus was originally set to have 56,000 sqm (600,000 sq ft) of technical space across 42 data halls at full build-out. The company’s website now says the campus will span 80,000 sqm (861,110 sq ft) of white space across 102 data halls.

The company has a second campus in Tokyo, known as TOK2. First announced back in May 2022, the company is concurrently working on the first two buildings on the site. It also has a 20MW project underway in Osaka.

As well as three Japanese developments, AirTrunk has data center campuses in operation and development in Singapore; Hong Kong; Johor, Malaysia; Sydney (x3), and Melbourne, Australia.

Founded in 2018, AirTrunk was acquired by Blackstone and Canada Pension Plan Investment Board for $16.1 billion last year, the largest-ever deal in the space