STT GDC Mumbai 3 is 9 MW, which makes it the largest of the three Mumbai city buildings and 2.25 times the other two combined. It is also smaller than every single Navi Mumbai building the same company runs — the smallest of those is 28 MW. No rack count, floor area, PUE, basis or stage is published. That makes this the most useful of the four thin STT records: it is the ceiling of what an operator will call a Mumbai city data centre, and the number is nine.
1At a glance
2How far this record gets
Eight questions decide whether a facility record is usable. This one answers two and a half of them.
| Question | Answered? |
|---|---|
| Is there a facility? | yes — named on the operator page |
| How many megawatts? | yes — 9 MW |
| Is that IT load or gross? | no — the basis is never stated |
| How many racks? | no |
| What is the PUE? | no |
| Is it operating, filling or a shell? | no |
| When did it open or when will it? | no |
| Has anyone independent confirmed it? | no |
The third row is the one that spoils the comparison. Everything else is a missing fact that can be found later. A megawatt figure with no basis cannot be used against a Chennai figure that does have one, and every attempt to do so quietly assumes whichever answer flatters the analysis.
Mumbai 1, 2, 3 and Navi Mumbai 1, 2, 3 all stop at exactly this point. Six buildings, six capacities, not one basis and not one rack count.
That is a disclosure choice, not an oversight. It is also the reason this registry can total STT exactly and still cannot tell you what the company operates in cabinets.
3Nine megawatts in the city tail
The three Mumbai city buildings are a tail on a suburban base, and 9 MW is the head of the tail.
| Building | MW | Share of the 133 | What it can host |
|---|---|---|---|
| Mumbai 3 | 9 | 6.8% | a mid-size enterprise tenant, or two |
| Mumbai 1 | 4 | 3.0% | one tenant with a redundancy requirement |
| Mumbai 2 | 1 | 0.75% | a single suite |
| City total | 14 | 10.5% | less than one Navi Mumbai building |
| Navi Mumbai 4, under construction | 36 | excluded | 2.6 times the entire city tail |
The point of the tail is not capacity. It is proximity: a city building is minutes from the customer, and 9 MW of it is enough for a bank, a broker or an enterprise with a latency requirement that Navi Mumbai cannot serve.
For market sizing, treat the 14 MW as a separate product that does not compete with the 119 MW in Navi Mumbai. Merging them produces a single Mumbai number that is 89% suburban and describes neither market accurately.
4Procurement
5Limits and open questions
- Six unanswered questions. Basis, racks, PUE, stage, dates and independent confirmation are all absent.
- Single source. Only the operator page carries the 9 MW.
- Nothing links this to the other city buildings. The operator does not say whether the three share plant, fibre or security.
- Not comparable with Navi Mumbai. Different product, different density, different customer — and neither publishes enough to prove it.
- What would close it. A rack count and a stated basis. Two lines, and this becomes a usable record.
6Sources
Sources: STT GDC India Mumbai city page, STT GDC India corporate site, STT GDC facility pages for Mumbai and Navi Mumbai, and Indian market commentary on Mumbai city data centre capacity.