NTT Mumbai 8 in Chandivali is a 36 MW facility with 2,800 racks — 12.9 kW per cabinet on facility power, or about 8.7 kW on IT load at the PUE established on the neighbouring building. It and Mumbai 9 are the only two buildings in this registry where a rack-level density can be calculated from published figures instead of assumed. Twelve point nine kilowatts a cabinet is roughly 60% above the Indian market average this file has been computing from assumed densities. That single pair of numbers changes what Mumbai capacity is actually worth.
1At a glance
2The only calculable density in Mumbai
Across ninety pages of this registry, density has been bracketed because rack counts are unpublished. Two buildings break that.
| Building | Power | Racks | kW a rack | Basis |
|---|---|---|---|---|
| Mumbai 8 | 36 MW | 2,800 | 12.9 | facility power |
| Mumbai 9 | 62 MW | 6,000 | 10.3 | facility power |
| Mumbai 8 on IT load | about 24.3 MW | 2,800 | 8.7 | at 1.48 PUE, an estimate |
| Everything else in this registry | published | not published | bracketed | assumption |
Both figures are facility-basis, which means they include cooling and losses. Converting to IT basis at the PUE derived on Mumbai 7 gives roughly 8.7 kW and 7.0 kW respectively. Those are still well above the 4 to 6 kW this file has assumed for Indian legacy stock.
The honest conclusion: Mumbai’s newest Chandivali halls are dense buildings, and the market average computed from older assumed densities understates them considerably.
3Why 12.9 kW matters
Density is the number that decides whether a building can serve the demand that now exists.
| Density | What it can host | Status in 2026 |
|---|---|---|
| 4 to 6 kW a rack | general enterprise, storage, virtualisation | the legacy Indian stock |
| 8 to 10 kW a rack | denser enterprise, contained aisles, some HPC | current market build |
| 12 to 15 kW a rack | high-performance compute, accelerated clusters with rear-door cooling | this building |
| 20 to 40 kW a rack | AI training nodes, requires direct-to-chip liquid | the frontier |
At 12.9 kW on facility power this is a building that can serve serious accelerated compute without a liquid retrofit, provided the cooling distribution supports it. That is a materially different commercial proposition from a 5 kW hall.
And it is why the absence of rack counts elsewhere matters. Every density claim about Indian data centres in every market report is built on assumptions, and the two buildings where the arithmetic is possible both come out well above the assumed average.
4What it means for AI load
The AI question in Indian data centres is almost entirely a cooling question, and rack count is how you answer it.
| If the hall were re-configured for | Racks at 36 MW facility | Change from 2,800 |
|---|---|---|
| 12.9 kW — the published density | 2,800 | — |
| 20 kW — liquid-cooled | 1,800 | −36% of the cabinets |
| 30 kW — dense AI training | 1,200 | −57% of the cabinets |
| 40 kW — top of the current range | 900 | −68% of the cabinets |
This is the arithmetic that makes AI capacity expensive: the same megawatts fit in fewer and fewer cabinets, and each cabinet needs more cooling, more weight tolerance and more power distribution per square foot. A building designed for 12.9 kW cannot simply be filled with 40 kW racks without rebuilding the floor.
So the useful question for any Indian data centre is not "how many megawatts" but "how many cabinets, at what density, with what cooling". NTT answers two-thirds of that here. Nobody else in this file answers any of it.
Rack count is the cheapest disclosure an operator can make and the most valuable one a tenant can receive. Two operators in this file publish it.
Without it, every density figure in the Indian market — including most of this registry — is an assumption.
5Procurement
6Limits and open questions
- 36 MW is facility power, not IT load. It is not comparable with Mumbai 7’s 25.6 MW IT figure.
- The IT density of 8.7 kW is an estimate derived from a PUE measured on a different building.
- No cooling specification. Supporting 12.9 kW is not the same as being able to take 20 kW.
- No floor area, so square-feet density cannot be computed either.
- No occupancy or tenant information.
- What would close it. A cooling specification and an operating PUE. Both would resolve the AI-readiness question for this building.
7Sources
Sources: NTT Global Data Centers Mumbai 8 facility page, Data Center Dynamics reporting on the Mumbai 8 launch and its 2,800-rack count, NTT India corporate site, and Indian market commentary on rack density and AI-ready data centre design.