NTT Mumbai 9 in Chandivali is 62 MW of facility load across 6,000 racks — the largest single data centre in Mumbai by megawatt, and about 39% of everything NTT counts in the city. Live since 2023. In July 2026 the Metropolitan Stock Exchange took 6.4 MW of IT load in it, at 52U racks of up to 17.2 kW. That lease is the whole story of the Indian market in two numbers: the building was designed to average 10.3 kW per cabinet, and its most public tenant is buying 17.2. Capacity is being sold twice as dense as it was built. On a facility basis the IT inside is roughly 42 MW at NTT's own 1.48 ratio — which means the number the market quotes and the number a tenant can use differ by twenty megawatts.
1At a glance
2The largest building in Mumbai
Market listings rank NTT Chandivali DC9 as the largest data centre in Mumbai at 62 MW. Nothing else in this registry comes close: the next largest single building is Mumbai 8 at 36 MW, in the same campus.
The first thing to notice is not the size. It is that four different units are in play across eight buildings from one operator in one city.
| Building | Location | Figure | Basis | Racks |
|---|---|---|---|---|
| Mumbai 9 | Chandivali | 62 MW | facility load | 6,000 |
| Mumbai 7 | Chandivali | 38 MW / 25.6 MW | facility / IT | not published |
| Mumbai 8 | Chandivali | 36 MW | facility load | 2,800 |
| Mumbai 6 | Andheri East | 19.2 MW | critical IT load | not published |
| Mumbai 5 | Chandivali | 12.5 MW | critical IT load | not published |
| Vikhroli IV | Vikhroli West | 3 MW / 4 MVA | IT / facility in MVA | not published |
| Vikhroli | Vikhroli West | 2.4 MW / 6 MVA | IT / facility in MVA | not published |
| BSE | Fort | 0.3 MW / 1 MW | IT / facility | not published |
NTT Mumbai counts 161 MW in this registry across all eight additive records. Three of those numbers are critical IT load, three are facility load, and two are MVA.
That is a mixed basis and there is no way around it until the operator publishes IT and facility load for every building, as it already does for Mumbai 7.
Sixty-two megawatts of facility load is not sixty-two megawatts a tenant can rent. At NTT's own 1.48 ratio, the rentable IT inside Mumbai 9 is about 42 MW.
36,000 racks, and a tenant at 17.2 kW
Mumbai 9 publishes a rack count, which almost nothing else in this country does. Divide 62 MW by 6,000 cabinets and the design average is 10.3 kW per rack. That is a normal, modern, air-cooled number.
Then in July 2026 NTT announced that the Metropolitan Stock Exchange — a SEBI-recognised national exchange running a relaunch — had taken 6.4 MW of IT load in the Chandivali campus, on 52U racks at up to 17.2 kW.
| Measure | Value | Note |
|---|---|---|
| Contracted IT load | 6.4 MW | single named tenant, July 2026 |
| Contracted rack power | 17.2 kW | 52U cabinets, high-density configuration |
| Cabinets that implies | about 372 | 6,400 kW divided by 17.2 kW |
| Share of Mumbai 9 | 10.3% | on a facility basis |
| Density versus design average | 1.67x | 17.2 against 10.3 kW per rack |
| Density versus Vikhroli legacy | 2.9x to 5.7x | 3 to 6 kVA per rack on the older sites |
A ten-megawatt lease taking a tenth of the building is not the interesting part. The interesting part is that a building designed at 10.3 kW per cabinet is being read on July 2026 terms at 17.2 kW — because trading engines and AI surveillance workloads do not fit in eight kilowatts.
For every megawatt at 17.2 kW you need 58 cabinets. At 10.3 kW you need 97, and at the legacy 5 kVA you need 200.
Floor space, cooling and the power distribution downstream of the UPS all scale with cabinets, not with megawatts. That is why a 62 MW shell built for the 2022 market is already being reconfigured for the 2026 one.
4What the campus arithmetic says
Mumbai 9 sits inside the Chandivali campus, which NTT has described as India’s first operational hyperscale data centre park and which it says will reach 250 MW of facility load at full build-out.
| Measure | Figure | Where it comes from |
|---|---|---|
| Campus build-out | 250 MW | NTT statements since the 2022 NAV1 launch |
| Counted today, 5 buildings | 136.1 MW | Mumbai 5, 7, 8, 9 plus Mumbai 6 in Andheri East on 161 MW |
| Share of build-out | 54% | 136.1 of 250 — facility and IT mixed |
| Racks implied at 250 MW | about 19,000 to 24,000 | at 10.3 to 12.9 kW per cabinet |
| Campus floor space | over 1,000,000 sq ft | NTT, at the Mumbai 7 launch |
| Balaji IT Park purchase | Rs 559.24 crore | about 30,000 sq m, January 2026, from Jeetendra and Tusshar Kapoor |
The arithmetic holds together. A 250 MW campus at 10 to 13 kW per cabinet needs roughly 20,000 to 24,000 racks; Mumbai 8 and 9 alone contribute 8,800 of them, and the campus was already at 13,000 racks when Mumbai 7 launched in 2022.
The Rs 559 crore Balaji purchase is the part worth pricing. Thirty thousand square metres of Mumbai commercial floor, bought specifically to extend a data centre campus, is about Rs 18,600 per square foot — and that is the land-and-shell cost before a single megawatt of electrical capacity is installed.
5Timeline
- NTT earmarks USD 2 billion for India data centre and solar expansion.
- Mumbai 7 goes live in Chandivali; campus described as 13,000 racks and 100 MW of load.
- Mumbai 9 scheduled live at 62 MW and 6,000 racks.
- Opening of the 62 MW Mumbai 9 confirmed alongside the Noida 2 campus launch.
- NTT buys Balaji IT Park space in Chandivali for Rs 559.24 crore.
- Metropolitan Stock Exchange contracts 6.4 MW of IT load at up to 17.2 kW per rack.
- Record verified for this registry. 62 MW counted on a facility basis.
6Procurement
7Limits and open questions
- 62 MW is facility load, not IT load. It is not comparable with Mumbai 5 at 12.5 MW or Mumbai 6 at 19.2 MW. The 42 MW IT figure on this page is derived at 1.48 and is labelled an estimate.
- The 161 MW Mumbai total is mixed-basis. Three IT, three facility, two MVA. Treating it as a single number overstates NTT’s rentable capacity.
- The Q2 2023 schedule and the January 2024 opening are a year apart. Both are published; the record keeps the earlier scheduled date and the later confirmed one.
- The floors 3, 4, 5, 6 and 9 listing is a directory entry, not an operator statement. It may indicate a multi-floor fit-out rather than a purpose-built shell. Unresolved.
- No PUE is published for Mumbai 9. The 1.48 used here belongs to Mumbai 7.
- No floor area, no cooling specification, no occupancy figure.
- What would close it. A published IT load and a stated PUE for this building would turn a market headline into a rentable number.
8Sources
Sources: NTT Global Data Centers Mumbai 9 facility page, Data Center Dynamics reporting on the Mumbai 9 opening and the MSE selection, Mingtiandi on the January 2024 opening, NTT and Business Wire announcement of the MSE 6.4 MW lease, Baxtel Mumbai market listings, TIA facility directory for BOM9, and The Hindu BusinessLine on the Balaji IT Park purchase.