Japan / Facility
NTT Keihanna OSK11 Data Center · 京阪奈OSK11データセンター · 京阪奈データセンター（仮称）
Operational colocation facility in Seika, Kyoto Prefecture, serving the Kansai market. NTT reports 30 MW IT capacity; historical plans began at 6 MW. The facility adjoins NTT research premises, but property coordinates and legal ownership remain unresolved.
Site / building photo
OSK11 east elevation, credited exterior photograph from NTT Facilities architectural portfolio; capture date undisclosed.
Published date unknown · Captured date unknown · Checked 2026-10-09
Research-selected property image; reviewer must confirm site identity, suitability and rights before publication.
waf.ntt-f.co.jp · Source and attribution ↗Portfolio credits ©（株）エスエス 秋田広樹. No reusable license or import permission established; visual inspection limited by inconsistent image access. Publication and capture dates were not independently established.
Statements retain their dates, definitions and development scope. Do not add these rows together.
| Claim / measurement | Scope and status | As of | Evidence and accounting |
|---|---|---|---|
| 30 MW IT load | OSK11 facility reported IT capacity Operational · cumulative | 2026-04-09 | Reported claim ↗ Excluded from capacity totals. As of opening announcement; facility page says up to 30 MW. Does not establish occupied load or all capacity commissioned. |
| 30 MW IT load | Provisional Keihanna facility ultimate IT capacity Planned · cumulative | 2022-09-29 | Reported claim ↗ Excluded from capacity totals. Historical announcement date; planned expansion from initial 6 MW. Overlaps the later 30 MW claim. |
| 6 MW IT load | Initial capacity within provisional Keihanna facility Planned · incremental | 2022-09-29 | Reported claim ↗ Excluded from capacity totals. Historical planned initial capacity, included within ultimate 30 MW; actual commissioning of this initial scope not established. |
NTT announced the provisional Keihanna facility through NTT GDC, with services planned for FY2025 second half.
Supporting source ↗September 2024 release targeted March 2026; retained as a plan, not an actual milestone.
Supporting source ↗April 2025 operator article targeted February 2026 completion.
Supporting source ↗NTT Facilities portfolio gives December 2025 completion.
Supporting source ↗Operator facility page lists February 2026 opening.
Supporting source ↗NTT DATA announced formal opening; distinguished from building completion and February opening.
Supporting source ↗Operator figure; architect lists addition as 28,964 m². Difference unresolved.
Source ↗Addition only; shared-property total 65,730 m² includes existing 36,766 m².
Source ↗Architect project boundary includes existing research premises; not established as dedicated OSK11 land.
Source ↗Current operator specification; historical plan gave 4,800 rack-equivalent space, not necessarily installed racks.
Source ↗2022 planning figure; differs from current maximum count.
Source ↗Operator specifications.
Source ↗Operator also lists priority fuel-supply contract.
Source ↗Chiller design from English page; Japanese page describes liquid-cooling capability, not confirmed deployment in every hall.
Source ↗Capability rather than proof of deployed tenant systems.
Source ↗Named carrier inventory not established.
Source ↗Design-equivalence claim; formal Uptime certification not established.
Source ↗Operator offers effectively zero-CO₂ service; does not establish universal renewable operation.
Source ↗Source attribution does not imply independent verification or permission to reuse images.
Published 2026-04-09 · Retrieved 2026-10-09
Announces official opening in Kyoto, Japan; identifies NTT GDC as operator and reports 30 MW IT capacity for hyperscaler and enterprise customers.
Published 2026-04-09 · Retrieved 2026-10-09
Confirms Japanese name, Kyoto/Keihanna identity, adjacency to NTT research facilities, 10,900 m² server rooms and Tier III-equivalent infrastructure.
Published Date unavailable · Retrieved 2026-10-09
Operator facility page specifies Seika, Kyoto; February 2026 opening; approximately 28,894 m² gross floor area, four floors, 3,800 maximum racks and renewable-energy options.
Published Date unavailable · Retrieved 2026-10-09
Markets a colocation environment with up to 30 MW IT load, dual substations, carrier-neutral connectivity and N+1 air-cooled chillers.
Published Date unavailable · Retrieved 2026-10-09
Records December 2025 completion and adjacency to NTT Communication Science Laboratories. Lists shared-property totals separately from the 28,964 m² addition and credits exterior photographs.
Published 2022-09-29 · Retrieved 2026-10-09
NTT announced construction through NTT GDC, with NTT Communications services planned for FY2025 second half; total 30 MW IT capacity starting at 6 MW and 4,800 rack-equivalent server space.
Published 2026-05-19 · Retrieved 2026-10-09
Industry report distinguishes February building opening from April formal opening and confirms Seika locality.
Published 2024-09-12 · Retrieved 2026-10-09
Separately discusses planned March 2026 opening of the provisional Keihanna facility in Seika. NVIDIA recognition concerns Osaka No.7, not OSK11.
Published 2025-04-30 · Retrieved 2026-10-09
Describes Keihanna completion planned for February 2026.
Published Date unavailable · Retrieved 2026-10-09
OSK11 east elevation, credited exterior photograph from NTT Facilities architectural portfolio; capture date undisclosed. Original image: https://waf.ntt-f.co.jp/architect/shared/osk11/d-02.jpg
Name: NTT DATA Opens Keihanna Data Center, Expanding Digital Infrastructure in Japan's Kansai Region; Keihanna OSK11 Data Center
Aliases: NTT DATA Opens Keihanna Data Center, Expanding Digital Infrastructure in Japan's Kansai Region; 関西地域に30MWの「京阪奈OSK11データセンター」を開設; 関西圏における新データセンターの建設について
Kind: 京阪奈OSK11データセンター; NTT Facilities architectural portfolio: OSK11
Country: NTT DATA Opens Keihanna Data Center, Expanding Digital Infrastructure in Japan's Kansai Region
Region: 京阪奈OSK11データセンター
City: 京阪奈OSK11データセンター; NTTデータグループ、京都・精華町で「京阪奈OSK11データセンター」を正式稼働
Metro: NTT DATA Opens Keihanna Data Center, Expanding Digital Infrastructure in Japan's Kansai Region; Keihanna OSK11 Data Center
Operator: NTT DATA Opens Keihanna Data Center, Expanding Digital Infrastructure in Japan's Kansai Region
Business Model: Keihanna OSK11 Data Center
Scale: NTT DATA Opens Keihanna Data Center, Expanding Digital Infrastructure in Japan's Kansai Region; Keihanna OSK11 Data Center
Statuses: NTT DATA Opens Keihanna Data Center, Expanding Digital Infrastructure in Japan's Kansai Region; 京阪奈OSK11データセンター
Summary: NTT DATA Opens Keihanna Data Center, Expanding Digital Infrastructure in Japan's Kansai Region; 京阪奈OSK11データセンター; Keihanna OSK11 Data Center; NTT Facilities architectural portfolio: OSK11; 関西圏における新データセンターの建設について
Location: 京阪奈OSK11データセンター
Stable identifier: 08824129-ca1e-47cc-b84e-a37ea2670ed2