Japan / Facility

Colt Tokyo Inzai 3 Data Centre

27 MWUnspecified powerInzai 3 planned completed facility capacity · 2019-06-11

Colt Tokyo Inzai Data Centre Three · 印西3

Operational

Operational hyperscale colocation facility in Chiba New Town, Inzai, Greater Tokyo. Colt announced service commencement on 9 November 2020 with 27 MW IT capacity. The current facility page describes it as fully leased and the third of four campus facilities. The shared campus address does not establish the individual building position.

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: Colt Data Centre Services
Ownership: Unknown / not established
Business model / scale: Colocation / Hyperscale
Region / metro: Chiba Prefecture / Greater Tokyo
City / locality: Inzai
Address: 2-3 Otsuka, Inzai-shi, Chiba 270-1352, Japan (shared campus address)
Location: Locality and shared campus address established; individual building coordinates not established.
Precision: unknown
Parent: Not assigned

Capacity evidence

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

Claim / measurement	Scope and status	As of	Evidence and accounting
27 MW IT load	Inzai 3 facility Operational · cumulative	2020-11-09	Reported claim ↗ Excluded from capacity totals. As-of is the dated service-commencement announcement. Reported facility capacity, not metered consumption; current undated facility page repeats 27 MW.
50 MW IT load	Historical Inzai campus total across facilities 1, 2 and 3 Operational · cumulative	2020-11-09	Reported claim ↗ Excluded from capacity totals. As-of is announcement date. Campus context only: includes Inzai 3's 27 MW and must not be assigned to this building or added to c1. Subsequent campus expansion makes this a historical total.
27 MW Unspecified power	Inzai 3 planned completed facility capacity Under Construction · cumulative	2019-06-11	Reported claim ↗ Excluded from capacity totals. As-of is construction announcement date. Release does not explicitly label this MW figure as IT; later opening announcement does. Overlaps c1.

Development timeline

2019-06-11 · announcement
Inzai 3 construction announced
Colt described the facility as under construction and targeted completion in Q4 2020.
Supporting source ↗
2020-Q4 · planned_completion
Original completion target
Planned completion quarter in the June 2019 announcement; subsequent opening was announced in November 2020.
Supporting source ↗
2020-11-09 · actual_service_commencement_announcement
Service commencement announced
Colt announced opening with 27 MW IT capacity and more than 90% pre-contracting.
Supporting source ↗
2026-03-10 · announcement
Inzai campus TRUE certification reported
Operator reported Certified-level TRUE Zero Waste certification for the campus; certification award date was not established.
Supporting source ↗

Disclosed specifications

White space

8,000 m²

Facility whitespace, not established land or gross floor area. Website headline inconsistently calls this gross site area; body and datasheet identify whitespace.

Source ↗

Building

Six-storey steel structure with seismic base isolation

Four data floors with two 1,000 m² halls per data floor are described in the construction announcement.

Source ↗

Design compute density

3.375 kW/m²

Disclosed design density; not observed rack density.

Source ↗

Electrical receiving system

66 kV active-standby

Voltage does not establish grid capacity in MW.

Source ↗

Backup generation

N+1 gas turbine generators; 48 hours onsite fuel at full load

Operator specification.

Source ↗

Cooling

Chilled water; hot aisle containment; CRAH on mechanical UPS backup

Sheet specifies N+2 chilled-water configuration per hall but elsewhere describes air conditioning as N+1; subsystem distinction requires clarification.

Source ↗

PUE

Average annual PUE below 1.4

Operator datasheet claim; measurement period and independently measured performance not provided.

Source ↗

Connectivity

Carrier-neutral; national and international carrier choices

Named carriers and route diversity were not established.

Source ↗

Tier design

Colt tier 3 specification

Design description; does not establish independent Uptime Institute Tier certification.

Source ↗

Waste certification

TRUE Zero Waste certification covering Tokyo Inzai 1–3

Operator-reported campus coverage; not a separately inspected building certificate.

Source ↗

Sources and references

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

Tokyo Inzai 3 Data Centre — Colt DCS ↗

Published Date unavailable · Retrieved 2026-10-09

Identifies the third of four campus facilities in Chiba New Town; reports 27 MW IT, 8,000 m² whitespace, fully leased status and carrier-neutral connectivity.

Coltデータセンターサービス、日本最大級のデータセンター「印西3」のサービス提供開始を発表 ↗

Published 2020-11-09 · Retrieved 2026-10-09

Announces service commencement in Japan with 27 MW IT; distinguishes the facility from the then three-building campus total of 50 MW IT.

Colt Tokyo Inzai 3 Data Centre — Location Data Sheet ↗

Published Date unavailable · Retrieved 2026-10-09

Facility sheet reports 27 MW IT, six-storey structure, 8,000 m² whitespace, receiving voltage, resilience and cooling specifications; publication date not established.

Colt Technology Services Group Limited — BSI IS 78946 certificate ↗

Published Date unavailable · Retrieved 2026-10-09

Lists Inzai Data Centers One, Two and Three jointly at 2-3 Otsuka, Inzai-shi, Chiba 270-1352, Japan. Revision dated 11 January 2023; expiry 26 April 2025.

Japan’s Booming Data Center Market Draws Multinationals as Digitization, 5G and AI Drive Growth — JETRO ↗

Published Date unavailable · Retrieved 2026-10-09

Places Colt's Inzai operations in Chiba Prefecture and the Greater Tokyo Area, and identifies Inzai 3 as a 27 MW facility opened in November 2020.

Colt DCS expands operations in Japan with the launch of Inzai 3 ↗

Published 2019-06-11 · Retrieved 2026-10-09

Construction announcement targeted Q4 2020 completion, with 27 MW, eight 1,000 m² halls and four data floors. The 30,798 m² site area refers to the campus.

Colt launches 27MW Inzai 3 data center in Japan — DCD ↗

Published 2020-11-10 · Retrieved 2026-10-09

Industry reporting corroborates opening, 27 MW facility capacity and 50 MW campus IT total; identifies an exterior image credited to Colt DCS.

Mitsui’s new Japanese Data Centre Development Fund Enters into Definitive Agreement to Launch Joint Venture with Fidelity ↗

Published 2021-07-14 · Retrieved 2026-10-09

Describes a development and operations JV and Colt's service-provider role, but does not establish ownership of the existing Inzai 3 property.

Achieving TRUE Zero Waste: How We’re Leading Circularity in the Data Centre Industry ↗

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

Reports Certified-level TRUE certification for the operational Inzai campus and 90% waste diversion over 12 consecutive months.

Decarbonising our Business — Colt DCS ↗

Published Date unavailable · Retrieved 2026-10-09

Explicitly includes Tokyo Inzai 1–3 in the operator's TRUE Zero Waste certification statement. Other energy and PUE figures are global rather than facility-specific.

Profile field evidence

Name: Tokyo Inzai 3 Data Centre — Colt DCS; Colt Tokyo Inzai 3 Data Centre — Location Data Sheet

Aliases: Coltデータセンターサービス、日本最大級のデータセンター「印西3」のサービス提供開始を発表; Colt Technology Services Group Limited — BSI IS 78946 certificate

Kind: Tokyo Inzai 3 Data Centre — Colt DCS; Coltデータセンターサービス、日本最大級のデータセンター「印西3」のサービス提供開始を発表

Country: Coltデータセンターサービス、日本最大級のデータセンター「印西3」のサービス提供開始を発表; Colt Technology Services Group Limited — BSI IS 78946 certificate; Japan’s Booming Data Center Market Draws Multinationals as Digitization, 5G and AI Drive Growth — JETRO

Region: Colt Technology Services Group Limited — BSI IS 78946 certificate; Japan’s Booming Data Center Market Draws Multinationals as Digitization, 5G and AI Drive Growth — JETRO

City: Colt Technology Services Group Limited — BSI IS 78946 certificate; Japan’s Booming Data Center Market Draws Multinationals as Digitization, 5G and AI Drive Growth — JETRO

Metro: Japan’s Booming Data Center Market Draws Multinationals as Digitization, 5G and AI Drive Growth — JETRO

Address: Colt Technology Services Group Limited — BSI IS 78946 certificate

Operator: Tokyo Inzai 3 Data Centre — Colt DCS; Coltデータセンターサービス、日本最大級のデータセンター「印西3」のサービス提供開始を発表

Business Model: Tokyo Inzai 3 Data Centre — Colt DCS; Colt launches 27MW Inzai 3 data center in Japan — DCD

Scale: Tokyo Inzai 3 Data Centre — Colt DCS; Coltデータセンターサービス、日本最大級のデータセンター「印西3」のサービス提供開始を発表