STT GDC Bengaluru 3 is 18 MW — 78.3% of the company’s entire Bengaluru portfolio, and larger than four complete city portfolios in the same estate: the Mumbai city tail at 14 MW, Delhi at 12, Kolkata at 9 and Hyderabad at 6. One hall in Bengaluru carries more capacity than STT runs across four other cities combined. No stage, rack count, floor area or PUE is published, so the most consequential building in south India outside Chennai is documented by a single number.
1At a glance
2One building, four city portfolios
Indian data centre capacity concentrates in single halls in a way that portfolio counts conceal.
| Record | MW | Buildings | Vs Bengaluru 3 |
|---|---|---|---|
| Bengaluru 3 | 18 | 1 | — |
| Mumbai city tail | 14 | 3 | smaller by 4 MW |
| Delhi portfolio | 12 | 3 | smaller by 6 MW |
| Kolkata portfolio | 9 | 2 | half the size |
| Hyderabad portfolio | 6 | 1 | a third of the size |
| Combined, all four | 41 | 9 | 2.3 times this building |
Nine buildings across four cities carry 41 MW. One Bengaluru hall carries 18. That is not a criticism of the operator — it is a description of how demand actually falls: a few large tenants in a few large halls, and a long tail of small city presences.
It matters for anyone selling into the market, because it tells you where the procurement is. A single 18 MW building buys more equipment than nine small ones, and the decision-making sits in one place rather than four.
3What 18 MW holds
No rack count is published, so the building’s commercial identity depends on an unpublished design decision.
| Assumed density | Racks | Floor area at 100 W a sq ft | What it can host |
|---|---|---|---|
| 5 kW a rack | 3,600 | about 180,000 sq ft | enterprise colocation at scale |
| 8 kW a rack | 2,250 | about 180,000 sq ft | current-generation hyperscale |
| 12 kW a rack | 1,500 | about 180,000 sq ft | AI-capable, if liquid-cooled |
At 8 kW this is a standard 2,000-rack hyperscale hall. At 5 kW it is a large enterprise colocation building. At 12 kW it is one of the few buildings in Karnataka that could take a serious accelerated-compute deployment.
Karnataka’s state policy targets 1 GW of IT capacity by 2031 with an AI-ready emphasis. Whether existing buildings like this one can carry that load depends entirely on the density they were designed to, which is the figure operators publish least often.
4Why Bengaluru concentrates
Bengaluru has the widest gap in the STT estate between its small buildings and its large one.
| City | Buildings | Total | Largest share of that city |
|---|---|---|---|
| Bengaluru | 3 | 23 MW | 78% in one building |
| Mumbai | 6 | 133 MW | 37% in one building |
| Pune | 5 | 40 to 81 MW | 30% in one building |
| Noida | 3 | 63 MW | 44% in one building |
| Delhi | 3 | 12 MW | 83% in one building, at 10 MW |
| Kolkata | 2 | 9 MW | 67% in one building |
Bengaluru and Delhi are the two most concentrated portfolios in the estate, both with a single dominant hall and small satellites. That is what a market looks like when one building was built for the tenants who mattered and the rest were kept for presence.
For a tenant, the practical consequence is that in Bengaluru there is effectively one STT building worth talking to. For a competitor, it means a single well-specified large hall is the whole competitive position in the city — which is either an opportunity or a warning depending on who is asking.
5Procurement
6Limits and open questions
- No stage or date. The card does not say whether the building is operating.
- No racks, floor area or PUE. The density bracket spans 1,500 to 3,600 cabinets.
- No tenant information. An 18 MW hall at 78% of a city portfolio almost certainly has anchor tenants, none disclosed.
- Counted at zero in a state total of 90.7 MW.
- Single source for the capacity.
- What would close it. A rack count and a design density. Two figures would make this the most useful record in Karnataka.
7Sources
Sources: STT GDC India Bengaluru city page, STT GDC India facility pages for Bengaluru, STT GDC India city pages for Mumbai, Delhi, Kolkata and Hyderabad for the comparison, STT GDC India corporate site, and Indian market commentary on Bengaluru data centre capacity.