Data pack · Updated 12 October 2026
How much data center capacity Japan has installed, how it compares with the rest of Asia Pacific, and what our trackers show about its sites, operators, deals and rules.
Japan data center capacity at a glance
Japan had about 2.6 GW of installed data center capacity (IT load) at the end of 2025, by our estimate. That is about 6% of the capacity in Asia Pacific and puts Japan at number 4 of the 26 countries in our global model. Our Data Center Tracker holds 9 sites in Japan run by 4 operators: 4 operational, 1 under construction and 4 planned. Our trackers also hold 6 verified deals and 7 government measures in force for the country.
Installed capacity is IT load, the power available to servers, storage and network. The country figure comes from the same model as the global and regional totals and is benchmarked against dated public figures. Site figures below are what each source states, often a campus’s full build-out, so they are not the same measure.
What our tracker holds for Japan
Largest tracked sites
| Site | Operator | City | Status | MW |
|---|---|---|---|---|
| TOK1 | AirTrunk | Inzai | Operational | 300 |
| TOK2 | AirTrunk | Tokyo | Operational | 110 |
| OSK2 | AirTrunk | Osaka | Planned | 100 |
| Tochigi campus | NTT DATA | Tochigi | Planned | 100 |
| CyrusOne KEP OSK1 | CyrusOne | Planned | 48 IT | |
| Osaka Nishiai campus | NTT DATA | Osaka | Planned | 36 |
| Keihanna OSK11 | NTT DATA | Soraku District | Operational | 30 IT |
| OSK1 | AirTrunk | Osaka | Under construction | 20 |
Where the sites are
| City | Sites | Operators | MW stated, live |
|---|---|---|---|
| Osaka | 3 | 2 | n/a |
| Inzai | 2 | 2 | 300 |
| Tokyo | 1 | 1 | 110 |
| Soraku District | 1 | 1 | 30 |
| Tochigi | 1 | 1 | n/a |
Cities with the most tracked sites. MW only where a source states it.
Power context
- Grid emission factor, 20240.45 kgCO2/kWh · Agency for Natural Resources and Energy (METI)
- Renewable share of electricity, 202423.1 % · Agency for Natural Resources and Energy (METI)
Rules in force
- PlanOCCTO Aggregation of Electricity Supply Plans FY2026: demand outlook citing data centres
- EfficiencyEnergy Conservation and Non-Fossil Energy Conversion Act: PUE standard for new data centres built from FY2029
- EfficiencyEnergy Conservation and Non-Fossil Energy Conversion Act: benchmark for the data centre industry (データセンター業に係る措置)
- PlanBasic Policy on Economic and Fiscal Management and Reform 2025 (経済財政運営と改革の基本方針2025): watt-bit collaboration and data centre dispersion
- PlanGX2040 Vision (GX2040ビジョン～脱炭素成長型経済構造移行推進戦略 改訂～): data centre siting and watt-bit collaboration
From government sources. Power and policy in Japan
Recent deals
- Oct 2026 · JV / partnershipChiba Project AI infrastructure at Chiba Thermal Power Station (up to 400MW), 400 MW, USD 15.0 bn
- Sep 2026 · M&ATokyo Data Centre 4 and Tokyo Data Centre 5, Inzai City, USD 1.2 bn
- Aug 2026 · Land / campusTsukuba Tech Central, phase 1 (50MW of planned 1GW campus), 50 MW
- Aug 2026 · M&AFurther 25.0% interest in Digital Osaka 3 (stake rises from 20% to 45%), 20 MW, USD 111 m
- Mar 2026 · FinancingAirTrunk TOK1 hyperscale campus, East Tokyo, 300 MW, USD 1.2 bn
- Jan 2026 · JV / partnershipSoya Green Data Center I (tentative name), Wakkanai, Hokkaido, 3 MW
Other countries in Asia Pacific
- China30.9 GW
- India1.6 GW
- Australia1.5 GW
- Singapore1.5 GW
- South Korea1.3 GW
- Malaysia1.3 GW
- Hong Kong0.8 GW
- Indonesia0.7 GW
Installed capacity, end 2025, DC Market Insights estimate. All countries and regions
Japan in the full data pack
By year to 2035
Installed MW for Japan from 2020 to 2035, in the same model as the global and regional totals, with low, base and high cases.
Leading hubs
Live and pipeline MW for the main metro markets, with the basis of each figure.
Every tracked site
The full site list with operator, location, status, MW and source, refreshed from our tracker.
Related research on Japan
Frequently asked questions
How much data center capacity does Japan have?
We estimate about 2.6 GW of installed data center capacity (IT load) in Japan at the end of 2025, about 6% of Asia Pacific and number 4 of the 26 countries in our model. This is a DC Market Insights estimate, benchmarked against dated public figures.
How many data centers are there in Japan?
Our Data Center Tracker lists 9 sites in Japan (4 operational, 1 under construction, 4 planned), run by 4 operators. Each site is verified from operator, planning or utility sources; the list grows as new sites are confirmed.
Which companies have the most tracked data center capacity in Japan?
By capacity stated at their sites (operational plus pipeline), the largest in our tracker are AirTrunk, NTT DATA, CyrusOne. Site capacity is counted only where a source states it.
What rules apply to data centers in Japan?
Our Power and Policy Tracker lists 7 government measures in force for Japan, such as incentives, tariffs, grid rules and national plans, each linked to the official source.
How will Japan data center capacity grow to 2035?
The full data pack gives installed capacity for Japan by year from 2020 to 2035, in the same model as the global and regional totals, with low, base and high cases and the main metro hubs.