A data-centre operator has attached a large Tokyo expansion to a set of environmental financing conditions. STTGDC announced on 27 October 2026 that it secured a ¥93 billion green-loan facility to fit out and operate the two buildings at its campus in Inzai City, Greater Tokyo.
The campus is designed for a combined 70.8 megawatts of IT load. The company says the financing follows the Green Loan Principles and includes eligibility criteria such as green-building certification and a design power usage effectiveness, or PUE, of 1.3 or below.
This is a completed financing announcement, not proof that every building is finished or that every efficiency target has been achieved in operation. TYO1 is operating; TYO2 remains under development.
What ¥93 billion is intended to finance
The loan supports fit-out and subsequent operation of STTGDC TYO1 and TYO2 at Goodman Business Park. TYO1 provides more than 32 MW of IT load when fully built out, while the operator lists TYO2 at more than 38 MW upon completion.
TYO1 opened in 2025 and has achieved LEED Gold certification. STTGDC says it is designed for an annualised PUE below 1.25 and uses a closed-loop cooling system intended to avoid ongoing water consumption during normal operation. The operator reports carbon-neutral Scope 1 and Scope 2 operations since opening, while continuing to procure renewable energy.
TYO2 is being developed for high-density AI and accelerated-computing workloads, with provision for future liquid cooling. It is targeting TIA-942-C design certification and LEED Gold.
PUE is useful—and incomplete
PUE divides all electricity entering a data centre by the electricity used by IT equipment. A perfect score of 1.0 would mean every unit of power reaches servers, storage or networking with nothing consumed by cooling, power conversion, lighting or other facility systems. In the real world, lower is generally better.
A design PUE of 1.3 means the facility expects to use roughly 0.3 additional units for overhead for every unit used by IT. It is a useful engineering target and an established industry metric, but it does not measure the carbon intensity of the electricity supply, the embodied emissions of construction, water stress, hardware utilisation or the value of the computing performed.
A green label depends on verification
The financing was supported by Standard Chartered as lead coordinator, with Mizuho Bank, OCBC, Société Générale and UOB. Standard Chartered and Société Générale also acted as green-loan coordinators. The structure is intended to connect access to capital with specified environmental criteria.
That connection only has value if the criteria are clear, reported and independently checked. A building can meet a design PUE and later operate differently because of climate, load level or equipment configuration. Reporting both annual PUE and the conditions under which it was measured would make performance easier to assess.
An independent Data Center Dynamics report puts the facility at roughly US$590 million and notes that TYO2 broke ground in 2024. It also distinguishes the operating first building from the build-out that the new loan will support.
AI readiness raises the bar
Dense AI racks concentrate far more heat than traditional enterprise servers. Liquid cooling can carry that heat away more efficiently than air, but it introduces pumps, heat exchangers, coolant loops and leak-management requirements. Designing TYO2 for future liquid cooling does not mean all halls are liquid-cooled today; it preserves an upgrade path.
Data-centre sustainability also depends on utilisation. A lightly used facility can post an efficient PUE while delivering little computing value. Conversely, a heavily used AI cluster may consume enormous power even if facility overhead is low. Capacity, efficiency and total energy demand must be reported together.
Finance becomes an engineering lever
The significance of the Tokyo loan is not that borrowing money makes a data centre green. It is that banks and operators are turning design metrics and certification into conditions attached to a major capital facility.
The next test is operational evidence: measured energy overhead, electricity sourcing, water consumption and performance as high-density customers move in. If those disclosures match the design commitments, green finance can reward better infrastructure. If they stop at labels and projections, the loan will say more about branding than efficiency.
Featured image: Clement Souchet/Unsplash. Contextual Tokyo skyline; not the STTGDC campus.
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