Tower 5 is the newest building at Sify’s Rabale campus: a G+8 hyperscale tower with an on-premise 220 kV GIS substation, 2,500 racks, and a design of 43.30 MW of IT power. A third-party tracker records 30.24 MW installed at the same 30 June 2025 date the operator uses. The campus total of 96.94 MW across five towers reconciles to the design figure, not the installed one: towers 1 to 4 account for 54.1 MW, and 96.94 minus 54.1 leaves 42.84 — Tower 5 at design. That makes this page the place where 12.6 MW of Sify’s published built capacity stops being a measurement and becomes an intention.
1At a glance
2Forty-three point three against thirty point two four
| Figure | Source and date | MW | Scope |
|---|---|---|---|
| Designed | Sify Infinit Spaces, 30 Jun 2025 | 43.30 | Design IT power of the tower as built |
| Rounded | Sify Technologies, 2026 | 43.2 | Same figure rounded down on the campus pages |
| Brochure | Sep 2024 | 38.8 | With 2,500+ racks, described as operational from September 2023 |
| Installed | Third-party tracker, 30 Jun 2025 | 30.24 | Equipment actually energised inside the design |
| This registry | — | 0 | Included in the parent campus aggregate |
The word designed is doing a lot of work in Sify’s own disclosure. The Infinit Spaces page says the campus had 96.94 MW of built IT power and that Tower 5 was designed for 43.30 MW. A tower can be built with a 43.3 MW design and hold 30.24 MW of installed switchgear and PDUs; both statements are true at once.
The installed figure also explains something the design figure cannot. 30.24 MW across 2,500 racks is 12.1 kW a rack, and Sify’s own factsheet for towers 7 to 10 quotes a power density of 10 to 13 kW per rack. The installed number fits the published density; the design number does not, unless the racks are counted only where the high-density pods sit.
If Tower 5 is 30.24 MW installed rather than 43.3 MW, then the campus built total is 84.34 MW, not 96.94 MW — a 13% overstatement against the figure used in every Sify capacity discussion since 2025.
This registry does not resolve it. The 4.32 MW and 30.24 MW installed figures come from a third-party tracker, and the operator has published neither. Both numbers are in the public record on the same date. The page prints both and prices the difference.
For a buyer the practical question is not which is true. It is which number the seller will use in a term sheet, and whether the contract prices megawatts of design or megawatts of delivered load.
3How 96.94 was calculated
The arithmetic is short and it is the reason this page exists. Sify’s five towers, with their individually published capacities from third-party specification sources:
| Towers | MW | Cumulative |
|---|---|---|
| Towers 1 and 2 combined | 22.0 | 22.00 |
| Tower 3 | 24.0 | 46.00 |
| Tower 4 | 8.1 | 54.10 |
| Tower 5 at installed | 30.24 | 84.34 |
| Tower 5 at design | 43.30 | 97.40 |
| Operator campus total | — | 96.94 |
Towers 1 to 4 sum to 54.1 MW. The operator’s campus total is 96.94 MW. The residual is 42.84 MW — which lands within 0.5 MW of Tower 5’s 43.30 MW design figure and 12.6 MW above its installed figure.
That is not a rounding difference. It is the difference between a campus that is 26% built against its 377 MW design, and one that is 22% built. Small in percentage terms, large in rupees: 12.6 MW at the replacement band of ₹51.4 to 60.1 crore per MW is ₹650 to ₹760 crore of plant that may be designed rather than installed.
Take the operator’s campus total. Subtract every individually published tower figure you can find. If the residual matches a design number rather than an installed number, the total is a design total.
It takes ten minutes with a spreadsheet and it is the difference between buying 96.94 MW and buying 84.34 MW on the same address.
Gridvik runs this test on every campus in the registry. Rabale and Chennai 02 are the two where it changes the number materially.
4What the tower is worth
| Basis | MW | At ₹55.3 cr per MW |
|---|---|---|
| Designed | 43.30 | ₹2,394 cr |
| Brochure | 38.80 | ₹2,146 cr |
| Installed | 30.24 | ₹1,672 cr |
| Difference, design minus installed | 13.06 | ₹722 cr |
₹55.3 crore per MW is Yotta’s disclosed D4 build cost, the closest comparable in this registry for a large purpose-built hyperscale tower. The band across five independent operators is ₹51.4 to 60.1 crore per MW. Apply the low end to the design figure and the tower is ₹2,222 crore; apply the high end to the installed figure and it is ₹1,817 crore. Every number in that range is an estimate and is labelled as one.
What is not an estimate is the ratio. One tower is 44% of the campus built total, 2,500 racks, and roughly a third of a billion dollars of plant by the midpoint of the band. It is also the tower that carries the 220 kV GIS connection, hosts the AI-ready liquid-cooled capability and made Rabale the first NVIDIA DGX-Ready certified data centre in India, in 2024.
So the tower is not the problem. The vocabulary is. Sify publishes designed capacity in a sentence that reads as built capacity, and the entire campus total inherits the gap.
5Procurement
6Limits and open questions
- Four published capacities — 30.24, 38.8, 43.2 and 43.3 MW. The registry counts zero here because Tower 5 is inside the PRJ-029 campus aggregate.
- The installed figure is third-party. 30.24 MW comes from a tracker, not from Sify. It is dated to the same 30 June 2025 as the operator’s design figure.
- The 12.6 MW gap is arithmetic, not a finding of fact. It is what remains when the tower figures are subtracted from the campus total.
- No PUE, no energised-rack count and no occupancy figure are published for Tower 5.
- The brochure describes the tower as operational from September 2023 and elsewhere as newly launched in 2025 — a two-year ambiguity in the delivery date.
- Cost per megawatt is an estimate using Yotta D4 as the closest comparable, not a disclosed Sify figure.
- What would close it. One sentence from Sify: installed, energised IT power of Tower 5 at the latest measurement date.
7Sources
Sources: Sify Infinit Spaces Mumbai data centre page dated 30 June 2025; the Sify Rabale data centre page with the 43.2 MW and 96.94 MW figures; the Sify data centre portfolio page; the Rabale brochure of September 2024; the Tower 5 to Tower 10 factsheet; and ArusGrid, which records 30.24 MW installed at 30 June 2025 and tower-level capacities for towers 1 to 4.