AirTrunk — TOK1 AI Expansion (Tokyo)

AirTrunk’s TOK1 campus in Inzai City, Chiba Prefecture — located in Tokyo’s eastern data center corridor — is undergoing a major 2026 expansion backed by a ¥180 billion (~$1.24 billion) green loan, the largest sustainability-linked data center financing in Japanese history. The expansion adds over 100 MW of new IT load to bring the campus total capacity beyond 300 MW, positioning TOK1 as one of the largest hyperscale data center facilities in Japan.

AirTrunk is an Asia-Pacific hyperscale data center developer acquired by Blackstone in 2022 for approximately $3.4 billion — at the time the largest data center acquisition in Asia-Pacific history. Blackstone’s ownership gives AirTrunk access to major institutional capital markets, enabling the green loan structure that finances the TOK1 expansion. The green loan designation requires AirTrunk to meet specific sustainability performance targets, including renewable energy sourcing and PUE benchmarks, which aligns with Tokyo-area hyperscale customers’ ESG reporting requirements.

Inzai City has emerged as Japan’s primary hyperscale data center corridor, concentrated in the Chiba Prefecture stretch east of central Tokyo. The area offers large industrial land parcels, access to the Tokyo metropolitan power grid, and proximity to submarine cable landing stations at Chiba and Nishi-Tokyo, providing connectivity to trans-Pacific and intra-Asian cable networks. The corridor is home to facilities from Equinix, NTT, Digital Reality, and several hyperscaler-owned campuses.

TOK1’s primary tenants are hyperscalers — Amazon Web Services, Google Cloud, and Microsoft Azure all use third-party colocation capacity in the Tokyo region to supplement their owned facilities as AI-driven demand outstrips their owned data center buildout pace. Japan’s AI compute demand has surged as Japanese enterprises accelerate AI adoption: Toyota’s autonomous vehicle AI, NTT’s language model development, major Japanese banks’ AI initiatives, and SoftBank’s various AI ventures all consume significant Tokyo-area compute.

The facility is designed for high-density AI rack deployments with liquid cooling infrastructure supporting GPU clusters up to 100 kW per rack, and is powered by 100% carbon-free energy through renewable energy certificates and direct PPAs with Japanese renewable energy producers.

**Capacity**: 300 MW total (post-expansion) · **Financing**: ¥180B green loan (largest in Japan) · **Operator**: AirTrunk (Blackstone-owned) · **Energy**: 100% carbon-free