242 facilities across 111 cities and 87 operators, with 1 GW in service. Every value comes from a named public page, and capacity that is announced or under construction is never merged into what is running.
In serviceUnder constructionPlannedStage not specified
Dashed edge: sized from a derived figure, not a reported oneSmall dot: city located and counted96 cities shown
Bubbles are placed at the city centroid, not at a facility address: the catalogue releases location at city granularity. Bubbles with a solid edge are sized from reported capacity; those with a dashed edge from a figure derived off the facility’s own reported dimensions. A derived figure sizes a bubble and nothing else — it enters no total, ranking, or statistic anywhere on this site. Planned capacity is not operating capacity. The map plots 8,944 facilities across 3,987 cities; a campus is plotted once, at the campus. Division shading covers the 8 of 242 facilities whose recorded region matches a division name. An unshaded division means the catalogue records no matching region for its facilities, not that it holds none — every facility is still plotted by city.
By development stage
1 GW
In service
769 MW
Under construction
1.3 GW
Planned
0 MW
Stage not specified
By facility count: 197 in service, 24 under construction, 20 planned, 1 stage not specified. 64 of the 242 report a capacity figure.
Data center cities in Japan
23 cities hold 3 or more catalogued facilities or a published capacity. A further 76 facilities sit in 63 locations with one or two each, all on the map above. 17 facilities have no published city.
Reported capacity is shown for the cities whose figures the release publishes; a dash means the city’s capacity is not published here, not that it has none.
Free sample records
What a record in Japan looks like
One of the ten free sample records is here, shown with retained supporting links where available.