Mumbai 2 is the second operating building on Colt’s 15-acre Navi Mumbai campus, behind a 220 kV GIS substation in LILO configuration and rated IGBC Platinum. It shares a 22 MW IT capacity with Mumbai 1, published only as a pair, so like its twin it counts zero in this registry. What makes this record worth its own page is the one number that is published: a PUE of 1.45. In two hundred records, this registry has found only two declared efficiency figures — AirTrunk’s design PUE below 1.4, and this one. Everything else in the Indian market is silent on the single number that determines a tenant’s power bill.
1At a glance
2Efficiency: two disclosures in two hundred records
Power usage effectiveness is the ratio of total facility power to IT power. It is the number that decides whether a tenant pays for 1 MW or 1.5 MW at the meter, and it is almost never published in India.
| Record | Declared PUE | Status of the claim |
|---|---|---|
| AirTrunk BOM1, BOM2, BOM3, MAA1, HYD1 | below 1.4 | Design target, all five cards |
| Colt DCS Navi Mumbai | 1.45 | Operator timeline page |
| Yotta NM1, Navi Mumbai | 1.5 | Design PUE on the operator page |
| NTT Mumbai 7 | 1.484 | Derived, 38 ÷ 25.6 — not declared |
| NTT NAV1A, Bengaluru 3, Bengaluru 4 | 1.48 to 1.50 | Derived from facility and IT figures |
| Every other record in the file | not declared | Silent |
The derived figures in the middle rows are the registry’s own division of published facility capacity by published IT capacity. They cluster at 1.48 to 1.50, which is where Indian hyperscale builds actually run.
Against that, Colt’s declared 1.45 is a good number and a credible one — it is consistent with the derived band rather than an outlier. AirTrunk’s below 1.4 is better, and it is a design target on unbuilt buildings.
A PUE of 1.45 against 1.6 is a 9% difference in total power draw for the same IT load. At Indian industrial tariffs, on 10 MW for a decade, that is a large number — and a tenant cannot compare what is not published.
The market has responded by making PUE a marketing claim rather than a measured disclosure. Nobody in this registry publishes an annual measured PUE. Every figure is a design value.
A monthly-refresh dataset with measured PUE per facility would be the single most valuable thing anyone could sell into Indian data centre procurement. Nobody is producing it, and this page is the evidence.
3Twenty-two hundred kilovolts and fifteen acres
| Item | Detail | Why it matters |
|---|---|---|
| Substation | 220 kV GIS, LILO | The same class as AirTrunk Airoli and NTT Mumbai |
| Parcel | 15 acres / 62,000 sq m | Enough for 120 to 148 MW of land capability |
| Gross floor area | 62,490 sq m | Multi-storey, not a single-storey shell |
| Land efficiency at 148 MW | 9.9 MW per acre | Against AirTrunk Mahape at 9.0 |
| Land efficiency live today | 1.5 MW per acre | Against 9.9 at full development |
| Power declared | 220 kV | The reason the 148 MW ceiling is credible |
The same six and a half times multiplication seen at Iron Mountain. Fifteen acres carrying 1.5 MW per acre today and 9.9 MW per acre at full development. The land is fixed; the megawatts are a design and substation decision.
The 220 kV GIS is what licenses the ceiling. A campus that publishes 148 MW without a switchyard is making a land claim. This one has the switchyard.
The gross floor area of 62,490 sq m on a 62,000 sq m site points to a floor area ratio around 1.0 per phase, which across three buildings implies low-rise blocks rather than the five and six storey stacks seen at AirTrunk Chandivali and L&T Mahape.
4Procurement
5Limits and open questions
- Capacity is not disclosed for this building. Zero megawatts are counted; the 22 MW appears in the text.
- PUE 1.45 is a design figure on an operator marketing page, not a measured annual value.
- 62,490 sq m gross floor area is a campus or first-phase figure, not per building.
- IGBC Platinum is a green building rating, not an operating efficiency certification.
- The 9.9 MW per acre at 148 MW depends on the 148 MW ceiling, which has itself moved from 120 to 134 to 148.
- What would close it. A per-building capacity split and a measured PUE.
6Sources
Sources: the Colt DCS Mumbai location and timeline pages; the Colt DCS Navi Mumbai launch release of September 2023; Datacenter Review on the launch; and Baxtel on site area and utility provider.