NTT NAV1A at Mahape is 30 MW of critical IT load inside 45 MW of total facility load, across 5,000 racks and 400,000 square feet, launched on 5 May 2022. Divide the two published figures and the ratio is exactly 1.50. That single number is the most valuable thing on this page, because it is the constant that lets you price NTT’s entire Indian book: apply 1.5 to any IT figure the operator publishes and you get the plant behind it. It is how the NAV1 campus plan reconciles to within 2% and how the 90 MW phase one turns out to be exactly two buildings. The building also carries the least dense of NTT’s three Mumbai-area halls with a published rack count — 9.0 kW of facility load per cabinet, against 10.3 at Mumbai 9 and 12.9 at Mumbai 8 — which is what a 2020 design looks like when a 2026 market reads it.
1At a glance
21.50, exactly
Every operator in this registry publishes a capacity figure. Almost none publish the two figures needed to say what that capacity costs to run. NTT does it for this building, and the result is a constant.
| If NTT publishes an IT figure | The plant behind it at 1.5 | Comment |
|---|---|---|
| NAV1A: 30 MW | 45 MW | published, and it matches |
| NAV1B: 30.4 MW | 45.6 MW | the registry uses this to size phase one |
| NAV1C: 25.6 MW | 38.4 MW | construction listing figure |
| NAV1D: 16 MW | 24 MW | planned |
| Campus: 150 MW plan | 100 MW of IT | the four phases publish 102 MW |
That is the whole method. One published pair turns a set of IT figures into a facility-load estimate, and the campus plan then checks itself: 102 MW of published IT at 1.5 is 153 MW, against a stated maximum of 150.
A single line on a facility page — 30 MW IT, 45 MW total — is worth more than a hundred megawatts of unlabelled headlines.
It is the difference between a number you can compare and a number you can only quote.
35,000 cabinets at 9.0 kW
NAV1A publishes a rack count, which puts it in a group of three in this registry. That makes density arithmetic rather than assumption, and the answer is not what the AI narrative would predict.
| Measure | Value | Basis |
|---|---|---|
| Facility load per rack | 9.0 kW | 45 MW divided by 5,000 |
| IT load per rack | 6.0 kW | 30 MW divided by 5,000, at the 1.5 ratio |
| Floor space per rack | 80 sq ft | 400,000 sq ft divided by 5,000 |
| Against Mumbai 9 | 13% lower density | 9.0 against 10.3 kW per cabinet |
| Against Mumbai 8 | 30% lower density | 9.0 against 12.9 kW per cabinet |
| Against the MSE lease | 1.9x lower | 9.0 against 17.2 kW per cabinet |
NAV1A is the newest building in this comparison by launch date and the least dense. That is not a design failure. It is a 2020 specification: enterprise and hyperscale cloud customers asking for 32A or 16A circuits and a standard configured around them.
The 2026 market is asking for 17.2 kW in a 52U cabinet. The same 30 MW that fits into 5,000 cabinets at NAV1A fits into 1,744 at that density. Floor space per megawatt falls by two thirds — which is why the newest ₹-per-MW comparisons are meaningless unless the rack count is stated.
4Liquid cooling, in 2022
NTT calls NAV1A the first data centre in India to deploy liquid immersion cooling and direct contact liquid cooling. It made that claim in 2022, four years before the AI rack became the market’s central problem.
| Item | What is published | What is not |
|---|---|---|
| Immersion cooling | deployed, first in India per the operator | capacity covered, or which halls |
| Direct contact liquid cooling | deployed | the kW per rack it supports |
| Standard rack power | 32A or 16A | whether those circuits are single or three phase |
| Cooling for standard racks | not stated for NAV1A | air-side design conditions |
| PUE | not published | the only figure that would let this be compared |
The claim is worth taking seriously and worth not over-reading. Having liquid cooling in a building is not the same as being able to sell a 40 kW cabinet in it: the halls have to be plumbed, the floor loaded and the manifolds installed. But it does mean the operator has run the technology in production longer than most of the Indian market has been talking about it.
And it is the reason to take NTT seriously on AI capacity even though NAV1A’s own density is 9.0 kW per cabinet. The capability is in the building; the configuration sold so far is not.
5Procurement
6Limits and open questions
- The 1.50 ratio is one data point. It matches Mumbai 7 at 1.48, which is why the registry treats 1.5 as NTT’s house standard — but two buildings are not a written specification.
- 9.0 kW per cabinet is facility load, not IT. The IT figure is 6.0 kW and is derived.
- No PUE is published for NAV1A. The 1.5 is a design ratio between two published capacities, not a metered efficiency.
- The liquid cooling claim has no capacity attached. No hall, no rack count, no kW per rack.
- The 32A or 16A rack standard is ambiguous — single or three phase changes the answer by a factor of three.
- No occupancy or tenant list.
- What would close it. A hall-level density figure and a power factor. Both are one line each, and neither is published.
7Sources
Sources: NTT Global Data Centers Navi Mumbai facility page, NTT newsroom release of 5 May 2022, Data Center Dynamics marketwatch on the NAV1A build, substation and high water table, The Hindu and Business Standard launch coverage, and Datacentermap and Baxtel facility listings.