Mumbai 1 is one of two operating buildings at Colt’s Navi Mumbai campus, live since September 2023. Colt publishes them together: 22 MW of IT power. The launch release adds the detail that matters — of that first phase, 18 MW was available, which means 4 MW was contracted on day one. No per-building capacity is published, so this record is flagged additive and carries nothing. It is the third such record in this registry and the effect is identical: 22 MW of operating capacity in Navi Mumbai contributes zero to a national total, while 64 MW of unbuilt capacity contributes 64.
1At a glance
2The fourth additive record with no value
This page exists to name a defect in the source data, and the defect is not Colt’s.
| Record | Capacity the operator publishes | Counted here |
|---|---|---|
| Iron Mountain MUM-1 (PRJ-188) | 2.5 MW | 0 MW |
| Iron Mountain MUM-2 (PRJ-189) | 6.3 MW | 0 MW |
| Iron Mountain NCR-1 (PRJ-193) | 200 kW to 12 MW | 0 MW |
| Colt Mumbai 1 (this record) | part of 22 MW | 0 MW |
| Colt Mumbai 2 (PRJ-207) | part of 22 MW | 0 MW |
| Total published but uncounted | 8.8 MW plus 22 MW | 0 MW |
| Colt Mumbai 3 (PRJ-208) | 64 MW, unbuilt | 64 MW |
| Yotta NM1 (PRJ-209) | 52 MW | 52 MW |
Read the last three rows together. Thirty megawatts of operating capacity across two operators counts as zero. A hundred and sixteen megawatts, of which sixty-four does not exist, counts in full.
A scraped dataset has no opinion about which number to use, so it takes whatever is in the field. A blank field therefore propagates as a zero, silently, and the resulting total is wrong in a direction nobody checks.
The correction here is not sophisticated: 22 MW exists, split it or leave it uncounted but say so. That judgement — which figure is the tightest defensible scope, and what to do when the tightest scope is unavailable — is the entire product.
Any buyer who has summed this registry’s additive column and compared it to an operator’s own page has already found this. The page exists so they find it with an explanation attached.
The registry does not invent a split. Two buildings, one published pair figure, no basis for division — so the honest treatment is zero here plus a page that states 22 MW in plain text. Forcing a 11 MW each would be worse than either.
3Four megawatts on day one
| Statement | Holds | Reading |
|---|---|---|
| First phase commenced with 22 MW | Yes | Capacity delivered |
| Available capacity of 18 MW of IT power | Yes | 82% was unsold |
| Implied contracted capacity | Derived | 4 MW — 18% |
| Parcel capable of supporting 120 MW | Yes | Land capability, not capacity |
| 220 kV GIS with LILO configuration | Yes | The substation that makes 120 MW possible |
| IGBC Platinum | Yes | Green building certification |
Four megawatts contracted on launch day in the middle of the largest data centre market in India is a fact about 2023, and it is worth holding against what replaced it.
By October 2026 the same operator announced that Mumbai 3, 64 MW, was fully pre-let before construction began. From 18% leased at launch to 100% pre-let in three years is not a gradual improvement. It is a change in what a building is: from a property product to a contracted cash flow.
For anyone valuing Indian data centre assets, that shift is the whole story of the 2023 to 2026 cycle, and it is measurable on this one campus.
4Procurement
5Limits and open questions
- Capacity is not disclosed for this building. Only the 22 MW pair figure exists.
- The 4 MW contracted figure is derived by subtracting 18 MW available from 22 MW delivered.
- Zero megawatts are counted here. The 22 MW appears in the text, not the total.
- PUE 1.45 is a design figure from the operator timeline page, not a measured annual value.
- Colt tier 3 specification is not the same as Uptime Tier III certification and the record does not conflate them.
- What would close it. One sentence from Colt giving Mumbai 1’s megawatts.
6Sources
Sources: the Colt DCS Navi Mumbai launch release of September 2023; the Colt DCS Mumbai location and timeline pages; Datacenter Review and The Hindu BusinessLine on the launch; Mingtiandi on the joint venture; and Baxtel.