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Hokkaido Tomakomai AI Data Center

Unknown MWTotal facility power not establishedSee capacity evidence for reported claims.

北海道苫小牧AIデータセンター · 北海道苫小牧データセンター · Hokkaido Tomakomai Data Center · Core Brain

Under ConstructionPlanned
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AI data-center site in Tomakomai, Hokkaido, developed initially by SoftBank and IDC Frontier. Construction is documented, with first-phase opening targeted for FY2026, ending March 2027. Initial planned maximum receiving capacity is 50 MW; future campus disclosures describe 300 MW or more than 300 MW. These are receiving-power claims, not established IT load. Future expansion is planned; opening and energized capacity have not been established.

Last researched 2026-10-09Last verified Not independently verifiedPublished revision 1
No approved site photo yet. Photos and their source dates are published after evidence review.

Site profile

Operator
SoftBank Corp.
Ownership
Unknown / not established
Business model / scale
Unknown / Unknown
Region / metro
Hokkaido / Unknown
City / locality
Tomakomai
Address
Unknown
Location
Tomakomai City, Hokkaido established by operator and municipal sources; no corroborated property point.
Precision: unknown
Parent
Not assigned

Capacity evidence

Statements retain their dates, definitions and development scope. Do not add these rows together.

Claim / measurementScope and statusAs ofEvidence and accounting
50 MW
Grid connection		Initial planned data-hall building maximum receiving capacity
Planned · cumulative		2026-10-09Reported claim ↗

Excluded from capacity totals. As-of is retrieval date of an undated operator KPI page; FY2026 operation is a target. Footnote defines receiving capacity, not IT load or measured energized capacity.

300 MW
Grid connection		Future maximum campus receiving capacity
Planned · cumulative		2026-10-09Conflicting claim ↗

Excluded from capacity totals. As-of is retrieval date; disclosure belongs to Integrated Report 2025, whose exact publication date was not established. Maximum 300 MW differs from above-300 MW language elsewhere; includes expansion and must not be added to initial 50 MW.

>300 MW
Grid connection		Ultimate expanded site receiving capacity
Planned · cumulative		2023-11-07Conflicting claim ↗

Excluded from capacity totals. As-of is announcement date. Expected future receiving capacity exceeds 300 MW; current facility page repeats this wording. Conflicts with the integrated report’s maximum-300 MW wording; no IT-load conversion or summation is supported.

Development timeline

  1. 2023-11-07 · announcement

    Tomakomai Core Brain development announced

    SoftBank and IDC Frontier announced joint development and subsidy selection.

    Supporting source ↗
  2. 2025-04-15 · actual

    Groundbreaking ceremony

    Operator reports ceremony held at the construction site.

    Supporting source ↗
  3. 2026-04-01 · actual_business_change

    Data-center business transfer to SoftBank

    Scheduled transfer announced in December 2025; current service page carries an effective-date absorption-split notice. Property-title transfer is not established.

    Supporting source ↗
  4. 2026-06-30 · announcement

    On-site woodland certification announced

    SoftBank announced Nature Symbiosis Site certification for property woodland; this is not a data-center operational certification.

    Supporting source ↗
  5. FY2026 · planned

    First-phase completion and opening

    Target fiscal year ends March 31, 2027; an actual opening date was not established.

    Supporting source ↗

Disclosed specifications

Ultimate site area

700,000 m²

Future campus scale; not established building floor area or first-phase developed area.

Source ↗

Energy strategy

100% locally sourced Hokkaido renewable electricity planned

Announced suppliers are SB Power and Hokkaido Electric Power; actual procurement and operational performance are unconfirmed.

Source ↗

Intended use

Internal generative-AI development and AI businesses; access for universities, research institutions and companies

Mixed internal and external compute use; retail colocation terms and named tenants were not established.

Source ↗

Initial development relationship

SoftBank-led consortium with IDC Frontier

Historical developer relationship; subsequent data-center business transfer to SoftBank is separately recorded.

Source ↗

Reported project funding

Approximately ¥65 billion project cost; up to ¥30 billion METI subsidy

2025 report expectations, not independently established final expenditure.

Source ↗

Environmental recognition

On-site woodland certified as a Nature Symbiosis Site

Announced June 30, 2026; applies to conserved woodland rather than facility uptime, energy efficiency or technical certification.

Source ↗

Sources and references

Source attribution does not imply independent verification or permission to reuse images.

SoftBank Integrated Report 2025 — Long-term Growth Strategy ↗

Published Date unavailable · Retrieved 2026-10-09

Printed page 23 targets first-phase completion and opening in FY2026 at 50 MW scale; describes future maximum receiving capacity of 300 MW, approximately ¥65 billion project cost and up to ¥30 billion subsidy.

SoftBank data-center service ↗

Published Date unavailable · Retrieved 2026-10-09

Current SoftBank service lists Tomakomai and carries an April 1, 2026 notice concerning the data-center business absorption split.

SoftBank World 2026 exhibition report ↗

Published 2026-08-03 · Retrieved 2026-10-09

Recent operator report still describes development in progress, FY2026 opening planned, and approximately 700,000 m² site area.

Profile field evidence

Name: Building for the AI Era: An Inside Look at SoftBank Corp.’s Next-generation AI Data Center in Hokkaido; Laying the Foundation for the AI Era: Construction Begins on Hokkaido Tomakomai AI Data Center

Aliases: 北海道苫小牧データセンター — SoftBank facility page; Construction of Core Brain — SoftBank and IDC Frontier announcement; Building for the AI Era: An Inside Look at SoftBank Corp.’s Next-generation AI Data Center in Hokkaido

Kind: 北海道苫小牧データセンター — SoftBank facility page; Laying the Foundation for the AI Era: Construction Begins on Hokkaido Tomakomai AI Data Center

Country: Building for the AI Era: An Inside Look at SoftBank Corp.’s Next-generation AI Data Center in Hokkaido

Region: Construction of Core Brain — SoftBank and IDC Frontier announcement; Building for the AI Era: An Inside Look at SoftBank Corp.’s Next-generation AI Data Center in Hokkaido

City: Construction of Core Brain — SoftBank and IDC Frontier announcement; Tomakomai mayor’s 2023 comments — SoftBank entry

Operator: 北海道苫小牧データセンター — SoftBank facility page; Absorption-type company split with wholly owned IDC Frontier; SoftBank data-center service

Statuses: Building for the AI Era: An Inside Look at SoftBank Corp.’s Next-generation AI Data Center in Hokkaido; SoftBank World 2026 exhibition report

Summary: Construction of Core Brain — SoftBank and IDC Frontier announcement; Building for the AI Era: An Inside Look at SoftBank Corp.’s Next-generation AI Data Center in Hokkaido; SoftBank Integrated Report 2025 — Long-term Growth Strategy; AIとの共存社会を支える次世代社会インフラの実現; Absorption-type company split with wholly owned IDC Frontier; SoftBank World 2026 exhibition report

Location: Construction of Core Brain — SoftBank and IDC Frontier announcement; Tomakomai mayor’s 2023 comments — SoftBank entry

Stable identifier: 5b64adc4-f9d3-480a-b9bf-b8f13564bec8