Bengaluru 4A went live in June 2026 with 22.4 MW of critical IT load across seven data halls of 3.2 MW — the first of three identical buildings on a campus that will reach 67.2 MW. It runs off a dedicated 220 kV gas insulated substation with a 220 kV LILO connection to the state grid and generators holding 48 hours of fuel. It is also the fourth NTT building in this registry at exactly 22.4 MW — Noida 2 Building A and the three Bengaluru 4 buildings. That makes it the operator’s most-used module and NTT’s newest large building in India. Three point two megawatts per hall is the most useful number here: it is the smallest unit NTT sells, and it is why a campus can be one third live and still open for business.
1At a glance
2Seven halls of 3.2 MW
The internal structure is the most useful disclosure on this building, because it tells a tenant what the smallest thing they can buy actually is.
| Level | Capacity | Note |
|---|---|---|
| Data hall | 3.2 MW critical IT | the smallest unit NTT publishes in India |
| Halls per building | 7 | operator-stated |
| Building A total | 22.4 MW | 7 x 3.2 |
| Campus total | 67.2 MW | 3 buildings of 22.4 |
| Facility load per hall | about 4.8 MW | at the 1.49 campus ratio, derived |
| Share of campus live | 33% | one of three buildings |
Three point two megawatts is roughly 400 to 600 cabinets at 6 to 8 kW, or 190 cabinets at 17.2 kW. It is a real commitment but not a hyperscale one, and it lets an operator place a single anchor tenant into a single hall without committing a building.
That granularity also explains why the campus announcement and the campus delivery diverge without anyone lying: Building A is complete, the halls inside it are fitted out against demand, and the market reads “22.4 MW live” whether four halls or seven are actually energised.
Not how many megawatts are live, but how many halls are fitted out and at what density.
NTT publishes the hall size. It does not publish the fit-out status, and that gap is where a 22.4 MW building can be 40% available or fully let.
3220 kV and 48 hours of diesel
The power architecture is published in unusual detail and it is the part of this building that will still matter in fifteen years.
| Item | Detail |
|---|---|
| Substation | 220 kV gas insulated, dedicated to the campus |
| Grid connection | 220 kV LILO arrangement from the state grid |
| Generator backup | 48 hours of HSD fuel storage |
| Fibre | Four dedicated points of entry |
| Sustainability | IGBC Platinum rated, renewable power integration |
| Security | Seven-layer system |
| Cooling | Campus able to support liquid cooling |
A dedicated 220 kV GIS substation is the single clearest marker of a serious hyperscale campus in India. It is also the item that most often decides whether an announced capacity is ever built, because the grid connection is slower than the building.
NTT has now done this twice — at NAV1 in Mahape in 2022 and here in Devanahalli in 2026 — and in both cases the substation was the engineering story. Forty-eight hours of fuel is also worth noting: most Indian facilities publish 24, and the difference is a business-continuity claim rather than a cost saving.
The combination is what a financial-services or sovereign tenant looks for: own substation, dual grid entry, two days of fuel, four fibre paths, and a certified green building. None of that appears in a megawatt figure.
4The fourth 22.4 MW building
22.4 MW is now NTT’s most-used building capacity in India. Four records in this registry carry it, and they span two cities and two years.
| Capacity | Buildings | Cities |
|---|---|---|
| 22.4 MW | Noida 2 A, Bengaluru 4A, 4B, 4C | Greater Noida, Devanahalli |
| 30.4 MW | NAV1B, Noida 2 B | Navi Mumbai, Greater Noida |
| 25.6 MW | Mumbai 7, NAV1C | Mumbai, Navi Mumbai |
| 30 MW | NAV1A | Navi Mumbai |
| 17.4 MW | Chennai 2A, 2B | Chennai |
| 19.2 MW | Mumbai 6 | Mumbai |
| 12.5 MW | Mumbai 5 | Mumbai |
Four buildings at 22.4 MW, three of them on this campus. The pattern is clear enough to be useful commercially: when NTT announces a new Indian campus at a multiple of 22.4, the building is known. When it announces 67.2, it means three of them.
The registry uses the module catalogue exactly this way — to size a building from its siblings before anyone has published a floor area, a rack count or a commissioning date for it.
Bengaluru 4A is the module at its most documented: 22.4 MW, seven halls, 220 kV, June 2026, IGBC Platinum. Buildings 4B and 4C are the same building with none of that published. One record carries what the other two can safely be assumed to be.
5Procurement
6Limits and open questions
- 22.4 MW is critical IT load, not facility load. The campus ratio of 1.49 gives about 33.4 MW of plant, which is derived.
- No rack count is published for this building, so density per cabinet cannot be computed.
- Hall fit-out status is unknown. Seven halls exist as a design; how many are energised is not published.
- No PUE, occupancy or tenant list.
- IGBC Platinum and the seven-layer security claim carry no certificate numbers in the published material.
- The December 2025 “ready for commissioning” milestone and the June 2026 opening are six months apart; both are published and the registry keeps both.
- What would close it. A rack count and a hall fit-out figure. Both are two lines on a facility page.
7Sources
Sources: NTT DATA announcement of 13 June 2026, NTT Global Data Centers Bengaluru 4 campus page, press release material distributed in December 2025 covering the 3.2 MW hall structure and the 220 kV substation, Data Center Dynamics reporting, and Economic Times Datacentres launch coverage.