NTT's NAV1 campus at Mahape in Navi Mumbai is planned at up to 150 MW of facility load across four data centres on an eight-acre site, announced on 5 May 2022 alongside the launch of the first building. It is one of the very few large campus numbers in this registry that can be checked. The four phases publish 30, 30.4, 25.6 and 16 MW of critical IT load — 102 MW — and NTT builds to a facility-to-IT ratio of 1.5. That gives 153 MW of facility load against the 150 MW plan. It closes to within 2%. Compare Chennai at minus seven, Noida at plus four and Pune at plus forty-one, and this is what a plan looks like when it was real. The campus is non-additive and counts zero in this registry, because a plan is not a building.
1At a glance
2150 MW, and the divisor is 1.5
Campus aggregates in this registry are usually the least checkable records in it. Palava sums children into a 400 MW design capacity. STT Mumbai publishes 133 against six non-additive buildings and nothing closes. Bengaluru’s 22.6 against 23 is the cleanest result in the file, and it is a rounding error.
NAV1 is different, and the reason is that NTT publishes both halves of one building. NAV1A is 30 MW of critical IT inside 45 MW of facility load. That is a ratio of exactly 1.5.
| Component | MW | Basis | Running total |
|---|---|---|---|
| NAV1A | 30.0 | critical IT, stated | 30.0 |
| NAV1B | 30.4 | critical IT, planned | 60.4 |
| NAV1C | 25.6 | critical IT, under construction | 86.0 |
| NAV1D | 16.0 | critical IT, planned | 102.0 |
| At NTT’s own 1.5 ratio | 153.0 | 102 x 1.5 | facility load |
| Campus plan as published | 150.0 | up to 150 MW facility | minus 2% |
Two per cent is inside the noise of how these numbers are rounded. The plan is real, the phases are real, and the ratio between them is consistent across a four-year-old announcement and a 2026 construction listing.
A campus figure that survives division by its own buildings is evidence the operator plans capacity rather than announces it.
In this registry, that is rare enough to be the finding. Eight of the ten campus aggregates cannot be checked this way because the phases publish no basis.
3Four phases, one verified
The reconciliation is clean. The delivery is not. Three of the four buildings have no verified current stage, and the schedules attached to them expired in the 2022-23 financial year.
| Phase | IT load | Stage | Evidence |
|---|---|---|---|
| NAV1A | 30 MW | operational | launched 5 May 2022, eight storeys plus basement |
| NAV1B | 30.4 MW | disputed | FY22 target; one 2026 report says still to join, one analyst lists it live |
| NAV1C | 25.6 MW | under construction | construction listing; no commissioning date |
| NAV1D | 16 MW | planned | no construction evidence |
The registry keeps all four, marks the two planned ones as planned, and counts none of them here because the campus row is the aggregate. The individual buildings are records PRJ-159, PRJ-160 and PRJ-161.
Note the split on the last two phases. NTT announced NAV1C and NAV1D together as a combined 40 MW. Current construction listings give them 25.6 and 16 MW — 41.6 MW combined. The registry does not invent a resolution; it keeps the combined figure where the operator gave one and the individual figures where a listing did.
4The 90 MW phase one
The most useful number NTT has published about NAV1 is not 150. It is 90 — the phase one target across the first two buildings.
Ninety of one hundred and fifty is 60% of the plan delivered in phase one. That is a committed first step, not a marketing ceiling — and it is why the stale schedule on NAV1B matters commercially: 45.6 MW of facility load, roughly half of phase one, sits behind a building whose status the operator has not restated since 2022.
| Campus | Facility load | Note |
|---|---|---|
| NTT Chandivali | 250 MW at build-out | the older Mumbai campus, 155.3 MW counted today |
| NTT NAV1, Mahape | 150 MW | eight acres, four buildings, this record |
| NTT NAV2, Airoli | 500 MW targeted | announced 2026, separate campus |
| PDG MU1, Navi Mumbai | 48 MW IT | operational, design PUE declared below 1.5 |
| Lumina, Navi Mumbai | 60 MW | two phases, Blackstone-backed |
Mahape is one of four nodes — with Airoli, Rabale and Ghansoli — that hold most of the Navi Mumbai market. NAV1 at 150 MW is the middle of that range, and NAV2 at 500 MW is the reason the 150 is not the number to watch.
5220 kV on a high water table
The engineering is the part of this campus that is genuinely documented, and it explains why the site could carry 150 MW at all.
| Item | Detail |
|---|---|
| Build time | 20 months from an industrial site to operational |
| Substation | On-site gas insulated substation at 220 kV — the first time NTT India had used this configuration |
| Sequence | Energised on an initial 22 kV line, moved to 220 kV after commissioning |
| Structure | G+8 with one basement floor |
| Ground | A high water table on former industrial land |
| Cooling | First data centre in India to deploy liquid immersion cooling and direct contact liquid cooling, per NTT |
A 220 kV connection is the difference between a 45 MW building and a 150 MW campus. It is also the slowest thing on any Indian data centre schedule, which is why the 2022 announcement moved from a 22 kV temporary line to a permanent 220 kV feed rather than waiting.
Twenty months from an empty industrial plot to a live 45 MW facility, on a high water table, with a 220 kV substation built on site.
Every other campus in this registry that has slipped, slipped on power or land. This one is the reference case for how fast the constraint can be cleared.
6Procurement
7Limits and open questions
- 150 MW is a maximum facility-load plan, not built capacity. It counts zero in this registry and should never be added to the phase buildings.
- The 2% reconciliation rests on a 1.5 ratio taken from one building. NAV1A is the only phase with both figures published.
- NAV1B’s stage is genuinely disputed. The operator’s page still carries an FY22 target, one April 2026 report says it is still to join, and one 2025 analyst lists it as operational.
- NAV1C and NAV1D were announced as a combined 40 MW and are now listed at 25.6 and 16 MW. The registry keeps both without choosing.
- Land area is inconsistent: eight acres for the campus, 4.3 acres in one NTT quote about the substation works.
- No campus-level PUE, occupancy or tenant list.
- What would close it. A dated stage statement for NAV1B and NAV1C. Two sentences would turn a 2022 plan into a 2026 position.
8Sources
Sources: NTT Global Data Centers Navi Mumbai facility page, NTT newsroom release of 5 May 2022, Data Center Dynamics reporting on the NAV1A launch and the NAV2 announcement, Data Center Dynamics marketwatch on the NAV1A build and substation, The Hindu and Business Standard launch coverage, Datacentermap and TIA directory listings for NAV1B, NAV1C and NAV1D, and independent Mumbai market analysis.