NTT Bengaluru 4 — 100, 67.2 and 22.4 megawatts, and which one is a buildingNTT Global Data Centers · Devanahalli, near Kempegowda International Airport · 67.2 MW critical IT · 3 buildings · BLR4A live · ₹2,400 crore

NTT’s Bengaluru 4 campus at Devanahalli is the best-disclosed data centre in this 242-record registry. It publishes a 100 MW facility load, 67.2 MW of critical IT load, three identical buildings of 22.4 MW each, 7 data halls of 3.2 MW per building, a dedicated 220 kV gas-insulated substation, a 48-hour diesel backup and an IGBC Platinum rating. It also gives a cost anchor: ₹2,400 crore for 67.2 MW is ₹35.7 crore per MW of IT load, the cheapest in this registry and 30% below the ₹51.4 to 60.1 crore band that most Indian capacity sits in. None of that is the interesting part. The same campus appears twice in this registry — as PRJ-172 at 67.2 MW and as PRJ-233 at 60 MW. Two records, two capacities, one eight-acre site. This page publishes both, explains why, and does not delete the duplicate.

1At a glance

2One campus, five published capacities

The ratio between the first two is the only PUE disclosure NTT has made for this site: 100 ÷ 67.2 = 1.49. That is a good figure, and it is mid-range for India’s declared estate, which runs from 1.40 at AirTrunk to 1.70 at Sify Hyderabad 01 on a shared floor.

The per-hall figure is the most operationally useful number on the page. Seven data halls of 3.2 MW per building means a customer can take a hall without taking a building, and it means capacity can be sold in 3.2 MW increments. Three buildings and twenty-one halls is a 67.2 MW campus that can be sold in twenty-one pieces — which is why a hyperscaler and a large enterprise can both land here.

3The duplicate: PRJ-172 and PRJ-233 are the same site

These are the same eight-acre site, recorded twice during different research passes and never merged. PRJ-172 was created from the operator’s specification page and carries the correct 67.2 MW critical IT load. PRJ-233 was created from a news report of the 3 December 2025 launch, which said the campus would hold “more than 60 MW”, and carries 60 MW with an at-least qualifier.

Both are flagged non-additive, so the duplicate has no effect on any published total. It affects two other things, and both matter commercially.

First, the record count. This registry claims 242 records and 14 states, representing 241 distinct facilities, and the duplicate is one of the two records that do not represent a separate site. If one campus occupies two of them, then the count of distinct facilities is 240, and every per-facility average it publishes is slightly understated. Second, the capacity. A reader who finds PRJ-233 first will believe this campus is 60 MW. It is 67.2 MW, and the difference is 7.2 MW — or about one-third of the live capacity of the entire campus today.

4100, 67.2 and 22.4 — and the cheapest megawatt in the file

Three numbers, three audiences, and the reason the registry counts buildings rather than campuses.

The spread between ₹24.0 and ₹107.1 crore per megawatt is a 4.5-fold range on the same ₹2,400 crore. Nothing changed except the denominator. This is why the registry states a basis on every record and why a cost-per-MW figure without one is not a number, it is an opinion.

The industry convention is IT load at full build, which is ₹35.7 crore per MW here. Used consistently, that puts Bengaluru 4 at the bottom of the file’s cost ladder.

Bengaluru 4 is ₹15.7 crore per MW cheaper than the bottom of the mainstream band and ₹17.3 crore cheaper than AirTrunk Mumbai. Two reasons, and neither is efficiency: the land is inside a developer’s park rather than assembled parcel by parcel, and it is 40 km from the city on the airport corridor.

That is the arbitrage the whole Devanahalli corridor is built on. At ₹35.7 crore per MW, 67.2 MW costs ₹2,400 crore. The same capacity at Colt’s ₹60.1 crore would cost ₹4,039 crore — a difference of ₹1,639 crore, or 68% more.

5Karnataka, before and after

The single most important fact about Karnataka is that 22.4 MW of it is live and 44.8 MW of the same campus is not. NTT Bengaluru 4 is a third of the state’s counted capacity at full build — 37.2% of 180.52 MW — and two-thirds of that campus is still a plan with a 220 kV substation already built.

Karnataka’s operated capacity is 54.72 MW across six records. NTT Bengaluru 4 alone, at 67.2 MW, is larger than the entire counted operating capacity of the state. That is what a single $288 million commitment does to a market that was previously three mid-sized facilities and a few edge sites.

6The acreage question and the Electronic City error

The Electronic City sentence is the kind of error that costs a site-selection team two weeks. NTT’s own page places a Devanahalli campus in Electronic City — a location 40 km away with a different power infrastructure, different fibre routes and different land costs — while correctly stating airport proximity in the same paragraph. The registry records Devanahalli.

The acreage spread is ordinary and harmless. 8.5 acres for 67.2 MW of IT load is 7.9 MW per acre, which is high-density by Indian standards and consistent with a three-building vertical campus rather than a sprawl.

367 W per square foot is the number that matters for AI. At that density a 3.2 MW hall supports roughly 25 racks at 130 kW each — the liquid-cooled configuration Sify and NTT both now claim. The campus was designed for the density the AI market is actually buying, not for the 5 kW racks it was built to replace.

7What would change this record

The 44.8 MW is not a demand question, it is a construction schedule question. The substation, the shell and the land are all in place; two identical buildings of 22.4 MW are what remain. When they commission, Karnataka’s operating capacity goes from 54.72 to 99.52 MW — an 82% increase in one state from two buildings.

8Sources

Sources: NTT Global Data Centers Bengaluru 4 campus specification page, 67.2 MW across three buildings of 22.4 MW and seven data halls of 3.2 MW, 17,000 m²; NTT launch release, 3 December 2025, 8.5 acres, 100 MW facility load, 67.2 MW critical IT load, 220 kV GIS substation, 48-hour diesel backup, four PoE routes, IGBC Platinum; Moneycontrol, 3 December 2025, ₹2,400 crore investment, 60 MW-plus campus claim, 22 live data centres in India, about 400 MW live IT load and more than 200 MW under construction; Economic Times, December 2025 and June 2026, ₹4,000 crore Bengaluru investment and the 22.4 MW first phase; Data Center Dynamics, campus acreage and US$288 million investment figure; Business Standard and PTI reproductions of the launch specification; Gridvik records PRJ-170 to PRJ-175 for the Bengaluru facility family. Record verified 26 October 2026.