AirTrunk has secured a 191.6 billion yen ( US$1.24 billion ) green loan to support the refinancing and continued development of its TOK1 hyperscale data centre campus in East Tokyo.

This is the largest data centre financing ever completed in Japan, underscoring the critical role of hyperscale digital infrastructure as the country accelerates its cloud and AI adoption.

Structured under AirTrunk’s Green Financing Framework, the loan will refinance existing facilities and fund development capex for the next phases of TOK1. These phases will add additional capacity to the campus – scalable to over 300 megawatts – enabling customers to expand their cloud and AI workloads securely, sustainably, and at speed. AirTrunk recently started construction to add over 100MW of IT load at TOK1 to support near-term customer demand.

The financing was led by SMBC, MUFG, Crédit Agricole CIB, and Société Générale as global coordinators. In total, 12 banks acted as mandated lead arrangers and bookrunners ( MLABs ), including all four global coordinators plus BNP Paribas, The Chiba Bank, DBS Bank, E.SUN Commercial Bank, Mizuho Bank, Natixis, Oversea-Chinese Banking Corporation ( OCBC ), and United Overseas Bank ( UOB ).

Major AI  market

AirTrunk founder and chief executive officer Robin Khuda says: “Japan is one of the world’s most important cloud and AI markets, and we’re committed to building the digital infrastructure that enables its long-term growth.

“AirTrunk has been investing deeply in Japan for this reason – to build the hyperscale platform that will underpin the country’s digital future and connect it to the broader region. This landmark financing enables us to accelerate the expansion of TOK1 and continue delivering the capacity our customers need today, while preparing Japan for the extraordinary compute demands ahead.”

The financing forms part of AirTrunk’s broader investment in Japan and follows the recent announcement of OSK2, the company’s second Osaka hyperscale data centre as well as its new Japan headquarters.

With this expansion, AirTrunk’s total investment in Japan has now exceeded US$8 billion, or 1.2 trillion yen, to support existing and planned projects over the coming years.

Massive capacity

At full build-out, AirTrunk’s four Japan campuses – TOK1, TOK2, OSK1 and OSK2 – will deliver about 530MW of total capacity for cloud and AI workloads, providing one of the largest hyperscale platforms in the country to support domestic and global technology customers.

Masato Hori,  AirTrunk’s associate vice president for treasury in Japan, adds: “The structure of the facility reflects our commitment to transparency, sustainability, and innovation in capital markets, and further strengthens AirTrunk’s financing platform across the region.”

The loan meets AirTrunk’s stringent energy efficiency standards, which require its data centres to operate significantly more efficiently than the regional average, thereby resulting in less energy to deliver the same compute power. This reduces emissions and supports AirTrunk’s 2030 Net Zero ( Scope 1  and Scope 2 ) commitments.

Margin incentives from the facility will be directed to the company’s Social Impact Fund, supporting community initiatives across Japan, including STEM education, digital equity, biodiversity and conservation, sustainable innovation, and disaster relief.