NTT Kolkata 1 at the Bengal Silicon Valley Tech Hub in New Town is a 7.5-acre, three-building campus planned for at least 25 MW of critical IT load inside 40 MW of facility load, at a reported cost of ₹2,000 crore. That works out to ₹80 crore per megawatt — the most expensive megawatt NTT builds in India, and 2.2 times its own Bengaluru campus at ₹35.7 crore. The reason is not land. It is density. Twenty-five megawatts in 500,000 to 600,000 square feet is 20,000 to 24,000 square feet per megawatt of floor, against 2,722 at Bengaluru 4. NTT is building roughly seven times the floor per megawatt in Kolkata, and paying for it. The first building, KOL1-A, is 6.4 MW — about a quarter of the campus. And the stage is disputed: coverage reported the campus launched in February 2025, while the operator’s own page still describes KOL1-A as planned.
1At a glance
2Four numbers and two conflicts
Kolkata has produced more published figures per megawatt than any other NTT campus in this file, and two of them contradict each other.
| Figure | Source | Note |
|---|---|---|
| 25+ MW critical IT | operator facility page | published as a floor, not a ceiling |
| 40 MW facility load | operator and 2023 groundbreaking | the operational power requirement |
| 6.4 MW, KOL1-A | operator facility page, current | conflicts with 6 MW |
| 6 MW IT / 9 MW facility, building one | 2023 groundbreaking coverage | conflicts with 6.4 |
| 500,000 sq ft | operator facility page | conflicts with 600,000 |
| 600,000 sq ft | 2023 groundbreaking and directory listings | one lakh plus two and a half plus two and a half |
| Two buildings | operator facility page | conflicts with three |
| Three buildings | 2023 groundbreaking and 2024 construction coverage | the original commitment |
Three conflicts on one campus, all of them small and none of them trivial. Six megawatts or six point four for the first building is a 7% difference. Five or six hundred thousand square feet is 20%. Two buildings or three changes the campus plan entirely.
The registry records all of them. It does not choose, because there is no basis on which to choose — the operator’s current page and the operator’s own groundbreaking are both primary sources and they do not agree.
The capacity is solid: 25 MW of IT at build-out, 40 MW of facility load, 6.4 MW in the first building.
Everything else — floor area, building count, stage — is published twice and differently. Any of it could be right.
3₹80 crore per megawatt
The cost is the most valuable figure on this page, because it puts Kolkata at the top of a ladder this registry can now draw across four NTT campuses.
| Campus | Cost | Capacity | ₹ crore per MW |
|---|---|---|---|
| Bengaluru 4, Devanahalli | ₹2,400 crore | 67.2 MW | 35.7 |
| NAV2, Airoli | ₹5,500 crore | 107 MW | 51.4 |
| Kolkata 1 | ₹2,000 crore | 25 MW | 80.0 |
| STT Kolkata 2, for comparison | ₹450 crore | 6 MW phase one | 75.0 |
Two operators, two campuses, one city, both landing between ₹75 and ₹80 crore per megawatt. That is not a coincidence and it is not a land-price story — Kolkata land is among the cheapest in urban India, and the state government has said the Silicon Valley hub was allotted at a fifth of market cost.
So the Kolkata premium is being paid for something else. The next section is what.
4Kolkata's density paradox
NTT is spending more than twice as much per megawatt in Kolkata as in Bengaluru, on land that costs a fifth as much. The explanation is floor area per megawatt.
| Measure | Bengaluru 4 | Kolkata 1 |
|---|---|---|
| Critical IT at build-out | 67.2 MW | 25 MW |
| Built-up area | 17,000 m² / 182,986 sq ft of data centre space | 500,000 to 600,000 sq ft |
| Floor per MW | 2,722 sq ft | 20,000 to 24,000 sq ft |
| Reported investment | ₹2,400 crore | ₹2,000 crore |
| Cost per MW | ₹35.7 crore | ₹80 crore |
| Land | 8.5 acres | 7.5 acres |
| MW of IT per acre | 7.9 | 3.3 |
Seven to nine times the floor per megawatt. Bengaluru is 67.2 MW in about 183,000 square feet of data centre space; Kolkata is 25 MW in half a million square feet of building. Those are not the same product.
The Bengaluru building is a hyperscale shell built to fill with 3.2 MW halls. The Kolkata building is a generous, multi-building, enterprise-facing campus in a market with no hyperscale base to fill it — so it is built with fewer megawatts behind more floor, at a higher cost per megawatt.
That is the honest read on the ₹80 crore figure. It is not inefficiency and it is not a land premium. It is the price of presence in a market that is being served before it is large.
For a buyer it means one thing: capacity in Kolkata will not be priced like capacity in Bengaluru, from either operator, and any comparison that treats Indian megawatts as interchangeable is wrong by a factor of two.
5Three buildings or two
The building count has been published as both, and it decides what the campus will eventually be.
| Count | Source | Implication |
|---|---|---|
| 3 | 2023 groundbreaking, 2024 construction coverage | one lakh plus two and a half plus two and a half square feet |
| 2 | operator facility page, current | two planned standalone buildings, 25+ MW between them |
| 2 plus one expected | directory listing | the compromise reading |
| First building | KOL1-A at 6.4 MW | leaves 18.6 MW for the rest |
If there are two buildings, KOL1-A is 6.4 MW and the second carries 18.6 MW — an unusual split for a campus that elsewhere uses identical modules. If there are three, the second and third are about 9 MW each, which is a much more ordinary shape.
NTT’s other campuses in this registry use repeated identical buildings: three at 22.4 MW at Devanahalli, two at 17.4 MW at Chennai, four at Mahape. A 6.4 MW first building followed by an 18.6 MW second would be the only campus in the file that does not.
Which is a reason to believe there are three buildings, and a reason to record that the operator’s current page says two.
6Timeline
- Groundbreaking at Bengal Silicon Valley. Three buildings announced, 25 MW IT minimum, 40 MW operational requirement, ₹2,000 crore, first phase ₹500 crore.
- NTT says the campus will be operational by March 2024, with 6 MW in phase one and 19 MW added later.
- Construction coverage shows the first building under construction on the 7.5-acre site.
- Coverage reports the campus launched and inaugurated, two years after groundbreaking and a year after the stated target.
- The operator’s own facility page still describes KOL1-A as planned at 6.4 MW. No commissioned capacity is confirmed in public record.
7Procurement
8Limits and open questions
- Stage is disputed. Coverage of February 2025 reports a campus launch; the operator’s page still lists KOL1-A as planned at 6.4 MW. The registry assigns no operating capacity.
- Twenty-five megawatts is published as a floor — at least 25 MW — and the residual 18.6 MW on this page is derived by subtraction, not published.
- Floor area is published as both 500,000 and 600,000 square feet. The density conclusion changes by 20% depending on which is used.
- Building count is published as two and as three.
- The first building is published at both 6 MW and 6.4 MW.
- ₹80 crore per megawatt compares a campus investment with a campus capacity and is scope-sensitive. It is used here alongside a second Kolkata operator as a cross-check, not as a verdict.
- No PUE, rack count or tenant list.
- What would close it. One commissioned-capacity figure from the operator. Everything else on this page would then resolve.
9Sources
Sources: NTT Global Data Centers Kolkata 1 facility page, Data Center Dynamics coverage of the February 2023 groundbreaking and the February 2025 launch, W.media on the inauguration, Times of India and Varindia on the 2023 announcement and schedule, Economic Times CIO on the investment, Datacentermap and Datacenters.com listings, STT GDC’s Kolkata 2 launch material, and Wikipedia’s West Bengal data centre list for cross-reference.