Japan Data Center Index

Market brief

Japan's data center market is outgrowing Tokyo and Osaka

Every major research firm covering Japan tells a version of the same story: AI-driven demand is colliding with a power grid that cannot keep pace in the country's two dominant metros, pushing capacity outward into secondary regional markets. This brief lays out the numbers, the constraint driving the shift, and where the facility-level data in this index fits into that picture.

1. How big is the market?

Three independent research firms give meaningfully different sizing for Japan's data center market — a reminder that "market size" depends heavily on scope (colocation only vs. total facility spend, IT load vs. real estate, forecast horizon). None of these is more "correct" than the others; they're shown side by side rather than averaged into a false single figure.

$9.93B (2024) → $13.35B (2030)

5.06% CAGR

Introl

$23.4B (2024) → $33.4B (2030)

6.7% CAGR

JLL

$12.76B (2025) → $38.92B (2031)

20.42% CAGR

Arizton

What's not in dispute is the scale of hyperscaler commitment flowing into the country:

  • AWS$15.24Bcommitted through 2027
  • Oracle$8Bover ten years
  • Microsoft$2.9Blargest Microsoft Japan investment in its 46-year history

2. The power constraint

The single biggest force reshaping where facilities get built is grid capacity, not land or labor. Reports describe waits of five to ten years for a new large power connection in inner Tokyo — long enough that operators are increasingly forced to look elsewhere before they can plan a build at all.

19 TWh → 57–66 TWh

Japan data center power demand, 2024 vs. 2034 projection

~60%

Share of Japan's total electricity demand growth expected to come from data centers

5–10 years

Reported wait time for a new grid power connection in inner Tokyo

6.6–7.7 GW

Projected data center peak power demand by 2034 (~4% of Japan's national total)

3. Concentration today, diffusion tomorrow

Greater Tokyo and Greater Osaka still host the overwhelming majority of Japan's computing power. But that share is expected to erode over the coming decade as secondary markets pick up load the core metros can no longer power.

~85–90%

Share of Japan's data center computing power currently concentrated in Greater Tokyo and Greater Osaka

~37% → 50%+

Tokyo's own share of national computing power, current vs. projected by 2026

up to ~35%

Share secondary markets (Kanagawa, Kobe, Ishikari/Hokkaido, Kyushu) could reach by 2034

This is exactly the shift the facility data in this index is built to track: it documents all 288 facilities spread across 9 regions — the concentrated Tokyo and Osaka core alongside the secondary markets absorbing its overflow, from Hokkaido's renewable-powered campuses and the Chiba/Kanagawa periphery around Tokyo, to Kansai's Kobe corridor and connectivity gateways in Fukuoka and Naha.

RegionFacilitiesMarkets
Kanto16011
Kansai683
Chubu185
Hokkaido103
Kyushu83
Chugoku74
Shikoku62
Okinawa62
Tohoku53

4. What the regional build-out looks like in practice

Two facilities in the dataset illustrate the pattern: hyperscale AI capacity and renewable-first design, both sited specifically to route around Tokyo's power ceiling.

FlagshipSapporo

SoftBank Hokkaido Data Center

SoftBank

  • First-phase investment of approximately $455.8 million (partially subsidized by Japan's Ministry of Economy, Trade and Industry, METI)
  • 700,000 sqm campus (~7.5 million sq ft) in Tomakomai, developed by SoftBank subsidiary IDC Frontier
FlagshipSapporo

KCCS ZED Ishikari

Kyocera Communication Systems (KCCS)

  • Operated by Kyocera Communication Systems (KCCS); completed October 2024 in the New Ishikari Port industrial area
  • Runs on ~4MW of renewable power (roughly 2MW solar, 2MW wind) plus a biomass partnership and battery storage, targeting round-the-clock carbon-free operation

5. Risk factors to weigh

  • Seismic exposure is a first-order siting consideration everywhere in Japan, not a secondary-market-specific risk.
  • Grid connection timelines in emerging hubs are improving but remain uncertain — some of the same congestion now hitting Tokyo is beginning to appear in fast-growing secondary markets like Inzai.
  • Renewable-powered sites (concentrated in Hokkaido) depend on continued subsidy support and long-term PPA availability, both of which are policy-sensitive.
  • Market-size estimates vary widely by source, as shown above — treat any single headline figure with appropriate skepticism.

All sources cited in this brief