Japan Data Center Index

Coverage

Market Briefing

Curated, dated market-intelligence briefings compiled in this project from public reporting.

In-depth, dated briefings compiled from public reporting. Each one is a snapshot as of its own date, not a running feed — see the news feed on the homepage for ongoing coverage.

September 13, 2026

Japan Data Center Market: Q2–Q3 2026 Investment, Capacity, and Power Briefing

A briefing on Japan's data center investment cycle, covering new facilities, capital commitments, hyperscaler and operator activity, the power/grid constraint, land acquisitions, government policy, and M&A — compiled from public reporting through September 13, 2026.

Summary

  • Japan has entered its largest-ever data center investment cycle: a September 5, 2026 Nikkei survey of 26 operators found AI data center capacity will more than quadruple from 1.1 GW (end-2025) to 4.9 GW by 2033, requiring “roughly 10 trillion yen, or about $60 billion, spread over eight years” — placing Japan behind only the US and China in AI compute scale.
  • The capital is coming from three directions at once: domestic telcos/trading houses (NTT's ¥1.5tn/$9bn+ plan, SoftBank's Sakai conversion, Itochu's 10-facility entry, KDDI's Sakai AI DC), global hyperscalers (Microsoft $10bn, AWS $15.24bn, Oracle $8bn), and infrastructure funds (Blackstone $30bn, DigitalBridge/JEXI, AirTrunk's record $1.24bn green loan).
  • The binding constraint is power, not capital: grid-connection lead times run 3–10 years, pushing projects to secondary markets (Hokkaido, Osaka/Kansai, Kyushu, Tochigi, Chiba) and to 2029+ timelines, even as Japan restarts nuclear (Kashiwazaki-Kariwa Unit 6, Feb 9, 2026) and Takaichi's government funnels ¥1.23tn into AI/chips for FY2026.

Key Findings

The macro number to anchor on.
The Nikkei survey (Sept 5, 2026) is the single most important recent datapoint: 22 of 26 surveyed operators intend to build additional AI data centers, lifting capacity from 1.1 GW to 4.9 GW by 2033, at roughly ¥10 trillion (~$60bn) of construction investment over eight years. The estimate rests on Cushman & Wakefield's figure that “building a one-gigawatt data centre costs an average of approximately $16 billion” (excluding GPUs/servers) — so total capital deployed will run materially higher once accelerators are counted.
Domestic champions are scaling fastest.
NTT is the anchor: NTT DATA plans to spend at least $9bn (¥1.5tn) through 2033 to quadruple capacity to 1 GW (+~750MW), while the NTT group targets 2 GW by fiscal 2033. SoftBank, KDDI, and now trading houses Itochu and Mitsubishi are all committing serious capital.
Hyperscalers keep escalating.
Microsoft's April 3, 2026 $10bn (¥1.6tn) 2026–2029 commitment is the newest headline, layered on AWS's ¥2.26tn ($15.24bn)-by-2027 plan and Oracle's $8bn/decade. Sovereign cloud is the dominant theme (Oracle Alloy + SoftBank/NTT DATA/Fujitsu; US-Japan air-gapped cloud).
Money managers have discovered Japan.
Blackstone's $30bn AI data center pledge (June 2026) and the DigitalBridge/JEXI “Nippon Gateway Infrastructure” launch (June/July 2026) — plus SoftBank Group's $4bn acquisition of DigitalBridge itself — mark Japan's arrival as a top-tier private-capital destination.
Power is the bottleneck.
Wood Mackenzie (“Japan's data centre gold rush,” Aug 26, 2025) projects data center electricity consumption “will more than triple from 19 TWh in 2024 to between 57 TWh and 66 TWh by 2034” — equal to 15–18 million households — driving 60% of the country's power demand growth. Research associate Naomi Oshita noted data centers will reach “around 4 to 5% of peak demand by 2034, far below the United States, where peak demand from data centers could reach as high as 15%.” Grid queues, a 1.4 PUE standard (April 2026), and nuclear restarts define the operating environment.

New facilities: announcements, groundbreakings, openings

KDDI Osaka Sakai Data Center — OPENED Jan 22, 2026. 48MW AI data center on the former Sharp Sakai LCD plant (acquired April 2025 for ¥10bn/~$68m). 57,000 sqm across four storeys. Built in ~six months by reusing Sharp's power/cooling. Runs Nvidia GB200 NVL72 (Blackwell); provides GPUs and on-prem services for Google's Gemini; delivered via KDDI's WAKONX platform, in partnership with HPE. (Source: KDDI Newsroom, Jan 22, 2026; Mingtiandi, Jan 26, 2026; HPE.)

SoftBank Osaka Sakai AI Data Center. Adjacent, larger portion of the same Sharp site — SoftBank paid ~¥100bn ($673m) for ~450,000 sqm of land / 840,000 sqm floor area. Initial 150MW, expandable to 250MW+ (some reports 400MW). Targeted operational by end-2026; core hub for SoftBank's “Cristal Intelligence” (with OpenAI) and its AX/GX Factory. SoftBank is also converting part of the site into Japan's largest battery (BESS) production line (GWh-scale from ~FY2027). (Source: Light Reading; DCD; SoftBank press releases.)

SoftBank Hokkaido Tomakomai AI Data Center. Groundbreaking April 15, 2025; first 50MW phase operational fiscal 2026. ~700,000 sqm site; planned to scale beyond 300MW toward 1 GW; 100% renewable (local Hokkaido power). Part of SoftBank's “Brain DataCenter” concept. (Source: SoftBank News.)

Ada Infrastructure (GLP-founded, Ares-owned) — groundbreaking Sept 3, 2026 on the third/final building at its Tokyo TKW1 campus (its fifth Japan project, “second groundbreaking in Tokyo in four months”). TKW1 comprises two 10MW buildings and one 11MW facility. Ada plans ~$12bn over five years for 900MW in Japan; current pipeline of five campuses totals 600MW (four in Tokyo — TKW1, Tokyo West 2 at 295MW, Tokyo East 1 at 66MW, Tokyo East 2 at 190MW — plus one in Osaka). (Source: DCD, Sept 3, 2026.)

NTT Global Data Centers. Broke ground on a 36MW Ibaraki City (north Osaka) campus in Oct 2025 (two 18MW buildings, first by early 2028). Acquired 32 acres in Tochigi Inter Industrial Park for two data centers totaling ~100MW, construction beginning 2027. Also acquired 8 acres in Osaka Nishiai for two data centers totaling 36MW (first opens FY2027). (Source: DCD; Mingtiandi; NTT.)

Vantage Data Centers KIX1 (Ibaraki, Osaka). First campus in Japan; 485,000 sq ft / 45,000 sqm, up to 68MW; first facility 28MW IT load operational early 2026; built with Taisei. (Source: Vantage.)

Goodman Tsukuba Tech Central. Planned up to 1 GW at full build-out, ~45 hectares (site bought from Tsukuba City Land Development Corp for ¥11bn/~$85m in 2022), up to 10 facilities. Per Goodman's Aug 17, 2026 announcement, it signed a 20-year lease with a “global hyperscale customer” for the 50MW first phase (facility TKO05), with power secured from TEPCO and ready-for-service targeted early 2028. (Source: Goodman Group; DCD; Blackridge.)

PDG TY1 (Saitama City). $1bn, 96MW campus; Phase 1 (48MW, six-story, 60,000 sqm) launched; 140kW/rack liquid cooling, PUE <1.34. Phase 2 (~48MW) ready-for-service expected Q4 2026. (Source: DCD; princetondg.com.)

STT GDC Tokyo 1 (Inzai, Chiba). First Japan facility at Goodman Business Park; up to 32MW (campus with Tokyo 2 = up to 70MW); into service early 2026; achieved LEED Gold Aug 21, 2026. (Source: W.Media; sttgdc.com.)

STACK Infrastructure. TKY01 (Inzai) 36MW flagship — first 18MW online 4Q24; broke ground on second 18MW building (TKY01B) Feb 16, 2026 (delivery 4Q27). Developing an 80MW KIX01 Osaka campus with ESR. (Source: STACK; Structure Research.)

DayOne (GDS) + Gaw Capital — Fuchu, Tokyo. 80MW campus at Fuchu Intelligent Park (~66,360 sqm); Phase 1 = 18MW IT (nine-story, 10 halls); core/shell ~mid-2027, operational 2028. (Source: DayOne; World Construction Network.)

EdgeConneX — market entry announced Jan 2025; 140MW+ campus in Greater Osaka-Kyoto, ready-for-service 2027. (Source: BusinessWire.)

Major investment announcements

Blackstone: $30bn into Japan AI data centers over 3–5 years (President/COO Jonathan Gray to Nikkei, June 23, 2026), “adding that the risk of not building enough computing resources outweighs AI bubble concerns”; Blackstone has already built more than 500MW in Japan and is in talks to develop facilities exceeding 1 GW. (Source: Nikkei/Reuters; Blackstone.)

NTT DATA: ¥1.5tn ($9bn+) through 2033 for 1 GW (+750MW); this fiscal year +42MW, data center spend up ~33% to ~$3.3bn; roughly ¥2–2.5bn per MW cost basis. (Source: Bloomberg, Aug 3, 2026.)

Itochu: several hundred billion yen by 2030 for ~10 facilities (~50MW each) across Greater Tokyo, Kansai, and Kyushu; plans to lease to hyperscalers then sell to investors; a potential joint venture with JR East. (Source: Nikkei, Aug 20, 2026; DCD; Shulman Advisory.)

AirTrunk: $1.24bn (¥191.6bn) green loan (March 10, 2026) — the largest data center financing in Japan to date — to refinance/expand TOK1 (scalable beyond 300MW; +100MW under construction). Total Japan investment now exceeds $8bn across four campuses (TOK1, TOK2, OSK1, OSK2) totaling ~530MW. (Source: DCD; AirTrunk; DealStreetAsia.)

STACK: ¥39.7bn (~$247.7m) green financing for TKY01 (Oct 23, 2025; Natixis, SocGen). Plus Microsoft's $10bn, AWS's ¥2.26tn/$15.24bn, and Oracle's $8bn commitments (detailed in the hyperscaler section below). (Source: STACK.)

Hyperscaler activity

Microsoft: $10bn (¥1.6tn) 2026–2029, announced April 3, 2026 by Brad Smith with PM Takaichi; expands in-country Azure GPU infrastructure (Tokyo, Osaka), works with Sakura Internet and SoftBank as the “sovereign GPU layer,” and aims to train 1M+ workers by 2030. Builds on an earlier $2.9bn commitment (April 2024). Also signed an Oct 2025 PPA with Shizen Energy for ~100MW of solar (Kyushu/Chugoku). (Source: Microsoft; TradingKey.)

AWS: ¥2.26tn ($15.24bn) by 2027 expanding the Tokyo and Osaka regions (announced Jan 2024); total 2011–2027 investment reaches roughly ¥3.77tn; estimated ¥5.57tn GDP contribution and 30,500 FTE jobs/year. (Source: Amazon; DCD; NetworkWorld.)

Oracle: $8bn+ per decade (April 2024); building out sovereign cloud via Oracle Alloy with SoftBank (Cloud Platform Type A — eastern Japan April 2026, western Japan Oct 2026), NTT DATA (Japan East Dec 2025, Japan West March 2027), and Fujitsu. Oracle is reportedly leading the race for Japan's air-gapped government cloud (Financial Times); this is tied to the March 19, 2026 Trump-Takaichi White House summit's sovereign-cloud commitment. (Source: DCD; Oracle; AI Weekly.)

Google: Inzai (Chiba) region — Japan's first Google self-built data center (2023), part of a $730m infrastructure package; cloud regions in Tokyo (since 2016) and Osaka (since 2019); a 15MW virtual PPA with Jera plus earlier solar PPAs. Continues scaling the Inzai site. (Source: DCD; Google.)

Key operators' moves

SoftBank: Sakai (Osaka), Tomakomai (Hokkaido), and Tokyo data centers; an OpenAI joint venture (SB OpenAI Japan); Oracle sovereign cloud partnership; battery/BESS manufacturing; and, at the corporate level, acquiring DigitalBridge for ~$4bn ($16.00/share) — stockholders approved April 23, 2026, with the deal expected to close in H2 2026. (Source: SEC filings; Simpson Thacher; DigitalBridge.)

KDDI: Osaka Sakai AI data center live since Jan 2026; received up to ¥10.24bn in METI subsidy for GPU cloud.

NTT: see facilities/investment sections above; group target of 1 GW domestic receiving capacity by FY2033; new liquid-cooled Tokyo (Shinagawa) data center and a Fukuoka submarine-cable-connected data center both slated for 2029; will supply data centers to Rapidus.

DigitalBridge + JEXI (Sumitomo Mitsui Trust Group): formed Nippon Gateway Infrastructure (NGI) (announced June 30/July 1, 2026), an enterprise colocation platform seeded with NEC's Kanagawa and Kobe data centers (acquired March 31, 2026); NEC stays on as anchor customer; led by CEO Hiroshi Ogasawara. (Source: BusinessWire; DCD; DigitalBridge.)

Digital Realty: expanded its Innovation Lab network to Japan (Feb 25, 2026).

Equinix: continued xScale/AI-ready capacity expansion; investing $4–5bn/year globally from 2026–2029 to double capacity by 2029.

Digital Edge, Colt DCS, ST Telemedia, STACK, Vantage, Princeton Digital, and GDS/DayOne all remain active (see facilities section). Separately, Colt DCS and ESR announced a joint venture on Oct 16, 2025 for a 130MW hyperscale campus in Minoh City, Osaka (Phase 1 = 65MW) on a ~140,000 sqm site; construction begins 2027, ready-for-service late 2029; targeting LEED Gold. (Source: ESR/PR Newswire; DCD.)

AI infrastructure / GPU clusters & government AI

METI subsidies (Economic Security Promotion Act): up to ¥72.5bn to five GPU-cloud providers — Sakura Internet (~¥50.1bn), KDDI (~¥10.24bn), Highreso/Highreso Kagawa (~¥7.70bn), RUTILEA/AI Fukushima (~¥2.56bn), and GMO Internet (~¥1.93bn).

National AI compute: ABCI 3.0 (AIST/METI) — 6.2 exaflops, 6,128 Nvidia H200 GPUs.

Physical-AI foundation model: METI/NEDO selected SoftBank-backed Noetra plus AIST; FY2026 budget of ¥387.3bn, with up to ¥1tn planned over FY2026–2030.

Regional AI factories: the Kagawa AI Factory Promotion Consortium (Aug 5, 2026) with Nvidia, Shikoku Electric, and 16 other partners.

Also notable: KDDI–HPE and SoftBank–OpenAI/Nvidia GPU deployments, and PowerX's containerized “Mega Power DC” product (Feb 2026).

Power, grid, energy

Nuclear: Kashiwazaki-Kariwa Unit 6 (1,356 MW ABWR) restarted Feb 9, 2026 — TEPCO's first reactor to resume operation since Fukushima, and the world's largest single nuclear plant — reaching commercial operation around March 18 with expected output of roughly 9,500 GWh/year. Unit 7 (1,356 MW) has been delayed to 2029–2030. The restart brings Japan to 15 operating nuclear reactors with a combined generation capacity of 33 GW; government policy targets roughly 20% nuclear by 2040. (Source: US EIA, Feb–March 2026.)

Grid: Wood Mackenzie projects data centers will drive 60% of Japan's power demand growth, with consumption reaching 57–66 TWh by 2034 (versus 19 TWh in 2024) and peak demand of 6.6–7.7 GW (roughly 4–5% of peak load). Bottlenecks are pushing projects toward 2029 timelines. Utilities are investing more than ¥150bn from 2026 to upgrade four Osaka substations and Greater Tokyo's 66kV network. Per Nikkei CrossTech, “lead times from grid connection to power reception can range from 3 to 10 years, making early verification essential.” A 1.4 PUE standard takes effect April 2026.

Renewables/PPAs: Microsoft–Shizen Energy ~100MW solar; Google–Jera virtual PPA; SoftBank's Tomakomai site runs on 100% renewable power; AirTrunk's green financing framework.

Land/site acquisitions

SoftBank & KDDI — the Sharp Sakai site (Osaka).

NTT — 32 acres in Tochigi; 8 acres in Osaka Nishiai.

ESR/Colt joint venture — approximately 140,000 sqm in Minoh City, Osaka.

Goodman — the 45-hectare Tsukuba Tech Central site (¥11bn, from Tsukuba City Land Development Corp).

Mitsubishi — the former JFE blast-furnace site in Kawasaki.

CapitaLand Investment — land in Osaka (2025).

EdgeConneX — a land lease in Greater Osaka-Kyoto (with Kagoya).

Itochu — planning site acquisitions across Greater Tokyo, Kansai, and Kyushu, possibly via JR East assets.

Regulatory / government policy

METI FY2026 budget: approximately ¥3.07tn total (+~50%), including roughly ¥1.23tn ($7.9–8bn) for semiconductors and AI (nearly 4x the prior year) — ¥150bn to Rapidus and ¥387.3bn to domestic AI/foundation models/data infrastructure. Effective April 1, 2026.

Takaichi growth plan (June 24, 2026): more than ¥370tn ($2.3tn) over 14 years, including ¥101.6tn for AI and chips, across 17 strategic sectors; the government has committed at least $66bn to AI by 2030, with corporate tax relief and data center subsidies.

Sovereign cloud / economic security: the Economic Security Promotion Act designates cloud as critical infrastructure; a US-Japan air-gapped cloud commitment was made at the March 19, 2026 summit.

Japan's Basic Plan for AI (2025) designates hyperscale data centers as essential national infrastructure.

M&A

SoftBank Group acquiring DigitalBridge — $16.00/share, ~$4bn enterprise value; announced Dec 29, 2025; approved by stockholders April 23, 2026; expected to close in H2 2026; FTC early termination granted March 11, 2026.

DigitalBridge/JEXI acquired NEC's Kanagawa and Kobe data centers (closed March 31, 2026) — seeding Nippon Gateway Infrastructure (NGI).

KKR and Singtel to fully acquire ST Telemedia Global Data Centres (STT GDC) — valuing it at S$13.8bn (US$10.9bn); closing expected H2 2026.

Blue Owl acquired IPI Partners (STACK's owner), early 2026.

Digital Edge acquired five data centers from Itochu Techno-Solutions (~$230m/¥26bn; an earlier deal, included here for context).

This briefing was compiled from a research pass across public reporting; citations name the original outlet and (where available) the article date, exactly as captured during that research. Where a direct source URL wasn't captured, the citation is shown as plain text rather than a link — consistent with this site's rule of never inventing a source link. See our Methodology page for the site's general sourcing standard.