For two years, Japanese banks chasing yield have financed a building boom in AI data centers across Asia, North America and Europe. Now their own regulator is asking how much risk they have quietly gathered on the way.
Japan’s Financial Services Agency said it will examine how banks assess credit risk on loans to data centers and other large facilities, part of its annual strategic priorities. The review will also cover lending to overseas nonbank lenders and real estate firms, according to reports by Nikkei Asia and others. The FSA has not disclosed which institutions it will examine or when it will finish.
The backdrop is a historic shift in Japanese interest rates. The Bank of Japan is expected to raise rates for the third time in less than ten months, the fastest pace of tightening since the asset bubble of 1990, with the benchmark rate at a 31-year high. For banks, higher rates cut two ways: better margins, but also new stress on borrowers and on property and infrastructure assets financed during years of near-zero rates.
Data centers sit squarely in the regulator’s sights because they are expensive and their cash flows are not as certain as a warehouse. A project can depend on a small group of technology tenants, a long-term power contract, permission to connect to the grid, or an operator’s ability to fill capacity. Delays in construction or power access can push back revenue while interest costs keep accruing.
Japanese regional banks and trust banks have been among the most eager lenders, drawn by spreads wider than domestic opportunities. Data-center financing has surged across the region, and the FSA’s review signals that supervisors want lenders to test tenant concentration, power availability, construction progress and refinancing plans before committing capital.
For data centers specifically, the risks are not only financial. The asset class carries concentration risk, the possibility that computing technology becomes obsolete quickly, and counterparty exposure to hyperscale tenants whose credit profiles can shift rapidly. A lender that underwrote a project around one anchor tenant may find that tenant renegotiating or moving.
The regulator’s concerns extend beyond data centers. It will also examine lending to overseas nonbank lenders and real estate firms, reflecting unease over how Japanese banks assess counterparty risk in cross-border transactions as Asian property markets face pressure. The FSA plans to review investment policies, project screening and risk management for these exposures.
The regulator’s annual strategic policies place data centers among a range of credit risks on its watchlist as lenders and borrowers adjust to higher rates after years of deflation. The FSA said it will monitor how banks manage assets and liabilities, including funding costs, noting that competition for deposits is intensifying as rates climb. It also said it will assess the governance and risk-management frameworks of major banking groups, given their global expansion and growing use of generative artificial intelligence. The same institutions financing the AI buildout are adopting the technology faster than their controls may keep up with.
Analysts said the scrutiny reflects a broader question for Japanese finance: whether institutions can expand into global infrastructure lending while keeping risks visible on their balance sheets. A lender may hold separate loans to a nonbank finance company, a property developer and a data-center operator that all depend on the same market, and a borrower-by-borrower review can miss that concentration.
The FSA has not said whether new guidelines or capital requirements will follow. But the review is likely to prompt internal audits of offshore loan books, stricter underwriting standards and slower growth in cross-border specialty lending, according to analysts. For borrowers, tighter controls could mean more frequent reporting and clearer disclosure of the assets behind their loans.
Japan’s role as a capital provider makes the review consequential beyond its own borders. Japanese megabanks and regional institutions have become significant financiers of digital infrastructure abroad, and any pullback would be felt by developers who have come to rely on that money.
The review comes as the broader AI infrastructure boom is being tested elsewhere. Oracle’s force majeure notice on a New Mexico data center this week rattled markets, and SoftBank shares fell amid concern that Stargate-related projects could slip. Japan’s regulator is asking a quieter version of the same question: how much of this spending, once financed, can actually be serviced.
For now, the immediate effect is procedural rather than punitive. The FSA has signaled that underwriting discipline, not lending limits, is the point. The question it has put to its banks is simple enough: when the rates that made these deals attractive begin to move, can each institution say exactly what it holds and what it would do if the assumptions behind those loans stop holding.
