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SoftBank Sakai AI Data Center

PRJ-0263 · Site · Sakai, Osaka, Japan

Record last updated Oct 28, 2026

Scope and capacity

SoftBank's current official infrastructure KPI, checked October 28, 2026, targets Sakai operations in FY2027 (April 2027–March 2028), superseding the earlier reported 2026 forecast. This is a fiscal-year target, not a promised calendar-year opening date. The KPI's estimated 140 MW receiving-power requirement is not IT load and is distinct from the historical 150 MW site-power plan. SoftBank Sakai AI Data Center — Conversion of acquired land and buildings within Sharp's former Sakai LCD plant; OpenAI site role not established by primary evidence. SoftBank Sakai AI Data Center is in Sakai, Osaka, 27, JP and is a data center campus with development status.

Headline: 400 MW Planned / design

Numbers refer to their stated physical boundaries and are not added together. Source dates, claim dates and record updates have different meanings. Missing dates and locators are not inferred.

Acquisition consideration · 100 JPY billion

Source report · SoftBank Sakai AI Data Center (Project)

Claim 24930 · Recorded claim type: Not stated · Review: Approved · Claim date: Not stated

  1. The SoftBank Group and OpenAI Launch SB OAI Japan

    SoftBank Group / OpenAI · Document date: Nov 5, 2025 · Corroborating

    Source reference: SRC-1410 · Company announcement · Recorded authority: Party primary

    Source URL

    https://group.softbank/en/news/press/20251105

  2. SoftBank Group Report 2025

    SoftBank Group · Document date: Jul 28, 2025 · Corroborating

    Source reference: SRC-1408 · Fact sheet · Recorded authority: Party primary

    Source URL

    https://group.softbank/media/Project/sbg/sbg/pdf/ir/financials/annual_reports/annual-report_fy2025_en.pdf

  3. SoftBank Corp. Integrated Report 2025

    SoftBank Corp. · Document date: Jul 1, 2025 · Primary

    Source reference: SRC-1407 · Fact sheet · Recorded authority: Party primary

    Source URL

    https://www.softbank.jp/en/corp/set/data/ir/documents/integrated_reports/pdf/sbkk_integrated_report_2025_en.pdf

  4. SoftBank buys JPY100bn old Sharp plant

    Yahoo Finance / TechCrunch · Document date: Mar 14, 2025 · Corroborating

    Source reference: SRC-1415 · News report · Recorded authority: Secondary

    Source URL

    https://finance.yahoo.com/news/softbank-buys-676m-old-sharp-092445803.html

  5. SoftBank, OpenAI to build AI data centre in Japan, Nikkei reports

    Reuters · Document date: Mar 13, 2025 · Corroborating

    Source reference: SRC-1411 · News report · Recorded authority: Secondary

    Source URL

    https://www.reuters.com/technology/softbank-openai-jointly-run-ai-agents-ex-sharp-lcd-plant-osaka-nikkei-reports-2025-03-13/

  6. SoftBank to build 150MW AI data center at Sharp Sakai plant

    Light Reading · Document date: Jun 11, 2024 · Corroborating

    Source reference: SRC-1416 · News report · Recorded authority: Secondary

    Source URL

    https://www.lightreading.com/data-centers/softbank-to-build-150mw-ai-data-center-at-sharp-s-sakai-plant

  7. SoftBank to Construct Large-scale AI Data Center at Sharp Sakai Plant

    SoftBank Corp. / Sharp · Document date: Jun 7, 2024 · Corroborating

    Source reference: SRC-1406 · Company announcement · Recorded authority: Party primary

    Source URL

    https://global.sharp/corporate/news/240607-a.html

Site area · 440,000 square metres

Reported rounded · SoftBank Sakai AI Data Center (Project)

Claim 24931 · Recorded claim type: Reported rounded · Review: Approved · Claim date: Not stated

  1. SoftBank to Construct Large-scale AI Data Center at Sharp Sakai Plant

    SoftBank Corp. / Sharp · Document date: Jun 7, 2024 · Primary

    Source reference: SRC-1406 · Company announcement · Recorded authority: Party primary

    Source URL

    https://global.sharp/corporate/news/240607-a.html

Power capacity · 150 MW

Planned / design or future potential · SoftBank Sakai AI Data Center (Project)

Claim 24933 · Recorded claim type: Not stated · Review: Approved · Claim date: Jun 7, 2024

Headline treatment: Separate claim, not added to the headline

  1. SoftBank to Construct Large-scale AI Data Center at Sharp Sakai Plant

    SoftBank Corp. / Sharp · Document date: Jun 7, 2024 · Primary

    Source reference: SRC-1406 · Company announcement · Recorded authority: Party primary

    Source URL

    https://global.sharp/corporate/news/240607-a.html

Future power capacity · 400 MW

Planned / design or future potential · SoftBank Sakai AI Data Center (Project)

Claim 24934 · Recorded claim type: Not stated · Review: Approved · Claim date: Jun 7, 2024

Headline treatment: Selected headline

  1. SoftBank to Construct Large-scale AI Data Center at Sharp Sakai Plant

    SoftBank Corp. / Sharp · Document date: Jun 7, 2024 · Primary

    Source reference: SRC-1406 · Company announcement · Recorded authority: Party primary

    Source URL

    https://global.sharp/corporate/news/240607-a.html

Inherited infrastructure · Land, buildings, electric power supply facilities and cooling systems

Source report · SoftBank Sakai AI Data Center (Project)

Claim 24938 · Recorded claim type: Not stated · Review: Approved · Claim date: Not stated

  1. SoftBank to Construct Large-scale AI Data Center at Sharp Sakai Plant

    SoftBank Corp. / Sharp · Document date: Jun 7, 2024 · Primary

    Source reference: SRC-1406 · Company announcement · Recorded authority: Party primary

    Source URL

    https://global.sharp/corporate/news/240607-a.html

Counterparties and capital

SoftBank Corp. · Developer, Operator · CMP-0706

Land and building acquisition

¥100,000,000,000 · Mar 1, 2025

SoftBank purchase of relevant Sakai land/buildings; not construction financing or total project cost.

Sharp Corporation (Other) · SoftBank Corp. (Other)

Sources (2)

Financing record 68; claim-specific source links appear in the exhibit sources where published.

This schedule captures public Cartis research. It is not a title, lien or legal-opinion report. Document page/section locators and claim review timestamps are included only when published; this version has no separate locator or claim-review-time feed.