Chennai 02 is the most complete data centre Sify has built: an AI-ready hyperscale campus at Siruseri with an integrated cable landing station rated to 2 PBps, four dedicated fibre paths, a dedicated on-premise 230 kV substation, Rated 3 and IGBC Platinum certification, and liquid cooling to 130 kW per rack. Tower B is operational. Sify publishes 25.92 MW of built IT power as of 30 June 2025. On the same date a third-party tracker records 4.32 MW installed — a sixfold difference on one building, from two sources that agree about the date and disagree about the meaning of built. At ₹1,882 crore of disclosed initial investment, the cost per megawatt depends entirely on which denominator you choose: ₹72.6 crore at 25.92 MW, ₹47.0 crore at the 40 MW of power infrastructure, and ₹436 crore at the 4.32 MW a tracker says is installed.
1At a glance
2Twenty-five point nine two and four point three two
| Figure | Source and date | MW | What it measures |
|---|---|---|---|
| Built IT power | Sify Infinit Spaces, 30 Jun 2025 | 25.92 | The capacity the campus is built and designed to deliver |
| Installed | Third-party tracker, 30 Jun 2025 | 4.32 | Equipment actually energised inside Tower B |
| Ready for service | Sify, Q4 FY24 earnings call | 26 | Capacity made available to customers |
| Portfolio card | Oct 2026 | 30 | Current published campus capacity |
The two dated figures share a measurement date and describe different things. 25.92 MW is what the building was built to deliver. 4.32 MW is what was energised. Neither source is wrong, and the gap between them is the single most useful number on this page.
4.32 MW is one sixth of 25.92 MW — a tower that is 17% live against its own built specification. For a building that only opened in 2025 that is not surprising: halls are commissioned in blocks, and anchor tenants are signed against a delivery date rather than a certificate of occupancy.
Sify says 25.92 MW built. A tracker says 4.32 MW installed. Sify says 26 MW ready for service on an earnings call, which is the number that matters commercially, and it is close to the built figure rather than the installed one.
That leaves three readings: the 4.32 MW figure is out of date or partial; the 26 MW figure is a contractable design capacity rather than energised plant; or the campus is genuinely six-sevenths unenergised.
Gridvik publishes all three and resolves none. Anybody paying for megawatts here should ask for energised plant, in writing, with a date — the same sentence that would settle Rabale Tower 5.
3Seven figures for one campus
| Figure | Source and date | MW | Scope and notes |
|---|---|---|---|
| Full campus | Current page | 130+ | Three towers, towers A and C still to come |
| Three-tower plan | Older page | 78 | With 13,000+ racks, later revised upward |
| Planned build | Third-party, Sep 2026 | 52 | Tracker’s own cumulative model |
| Tower B, promotional video | 2025 | 43 | Claimed capacity of the first operational part |
| Portfolio card | Oct 2026 | 30 | Current published campus figure |
| Built IT power | 30 Jun 2025 | 25.92 | Operator, dated, precise to two decimals |
| Installed | 30 Jun 2025 | 4.32 | Third-party tracker, same date |
| This registry | — | 0 | Inside the PRJ-028 campus aggregate |
The 78 to 130+ revision is worth naming because it is the largest single upward change in this file outside Yotta. In 2024 Sify said a three-tower campus at Siruseri would add 78 MW and 13,000+ racks. By 2026 the same three towers are 130+ MW. The tower count and the rack count did not change. The megawatts rose by 67%.
One explanation fits and it is a commercial one: the racks were re-specified for AI density. A hall designed at 6 kW a rack and later fitted for 130 kW carries more than twenty times the power on the same floor plate, and 13,000 racks at an average of 10 kW is 130 MW. The 78 MW figure is what the same steel is worth at enterprise density.
That also resolves the 130 kW claim, which looks absurd next to a 130 MW campus until the arithmetic is done: 130 MW across 13,000 racks averages 10 kW. The 130 kW cabinets are the liquid-cooled pods, not the building.
4Pricing ₹1,882 crore three ways
| Denominator | MW | ₹ crore per MW |
|---|---|---|
| Power infrastructure, per the state announcement | 40 | 47.0 |
| Ready for service, per the earnings call | 26 | 72.4 |
| Built IT power, per the operator | 25.92 | 72.6 |
| Installed, per the tracker | 4.32 | 435.6 |
₹47 crore or ₹436 crore per megawatt — a ninefold range from a single capital figure. That is the clearest illustration in this file of why a cost-per-megawatt number is meaningless without its denominator.
The 40 MW denominator is the one to avoid. It is the utility connection supporting the phase, and it is internally consistent with a 25.92 MW IT load at a power usage effectiveness of about 1.54 — 25.92 × 1.54 = 39.9 MW. Dividing capex by 40 prices utility power as if it were IT power and produces a figure that looks competitive with the cheapest build in the country. It is not.
The 4.32 MW denominator produces ₹436 crore per megawatt, which is a statement about how early in commissioning the campus is, not about its cost efficiency. Quoting either extreme is a way of misleading a reader without stating a falsehood.
₹72.6 crore per MW at the built figure is the one comparison that means something, because it is the only denominator the operator and the market both use for a completed phase.
5The cable station, the switchyard and the premium
Against the replacement-cost band of ₹51.4 to 60.1 crore per MW established across five independent operators, Siruseri at ₹72.6 crore carries a premium of ₹12.5 to 21.2 crore per megawatt — or ₹324 to 549 crore across 25.92 MW. Both are arithmetic on published figures and both are labelled estimates.
Three things plausibly account for it, and all three are physically verifiable in the record:
| Item | Detail | Why it costs |
|---|---|---|
| Integrated cable landing station | Up to 2 PBps, four dedicated fibre paths | Submarine capacity is the scarcest input in Indian data centres |
| 230 kV dedicated substation | On-premise, against a 40 MW phase connection | A switchyard at this class is a fixed cost that a 25 MW phase carries alone |
| AI-ready liquid cooling | 130 kW per rack, NVIDIA DGX-Ready certified 2025 | Coolant distribution, manifolds and higher-density floor loading |
| Certification | Uptime Rated 3, IGBC Platinum | Design, commissioning and documentation overhead |
| Grid connection | 130 MW for the full campus | Secured in advance for towers A and C |
The cable landing station is the one that changes the commercial argument rather than the cost. India has a handful of landing points and almost no data centre can offer subsea capacity on the same campus. A tenant that needs to terminate international capacity — a cloud provider, an OTT, a content network, a financial exchange — has a very short list of buildings to choose from, and Siruseri is now on it.
That is the strategic reason to pay a 20 to 40% premium per megawatt: it is not a data centre with a cable station attached, it is a landing point with 130 MW of capacity behind it. The metro is the more valuable asset, and the megawatts are what make it sellable.
Built 25.92 MW, designed 130+ MW, installed 4.32 MW on the same date as the built figure, priced at ₹72.6 crore per megawatt.
The premium is defensible and the campus is real. The only number that cannot be relied on is the one an operator will lead with.
Ask for energised plant and a tower-level schedule. Everything else here is already public and already on this page.
6Procurement
7Limits and open questions
- Seven published capacities — 4.32, 25.92, 26, 30, 43, 52, 78 and 130+ MW. The registry counts zero here, because the megawatts sit inside the PRJ-028 campus aggregate.
- 25.92 MW and 4.32 MW share a date but not a meaning. One is built, the other installed. The page does not choose between them.
- The 78 to 130+ revision is unexplained in public. The re-specification for AI density is a plausible reading, not a stated cause.
- ₹1,882 crore is described as an initial investment. What it covers — Tower B alone, or site-wide infrastructure including the cable station — is not itemised.
- No PUE is published for Siruseri, so the 1.54 used to reconcile 40 MW against 25.92 MW is an inference, and is labelled as one.
- Occupancy and realised rent are not disclosed for any Sify facility, so revenue from this campus cannot be derived from public data.
- What would close it. One sentence: energised IT megawatts at Siruseri, by tower, with a date.
8Sources
Sources: the Sify Chennai 02 data centre page with the 25.92 MW, cable landing station, Rated 3 and IGBC Platinum specifications; the Sify Chennai data centre page; the Sify data centre portfolio page; Sify Infinit Spaces Chennai data centre page dated 30 June 2025; the Sify Infinit Spaces integrated report of 2025; DCD and The Print on the campus and its grid connection; ETV Bharat on the ₹1,882 crore investment and 40 MW of power infrastructure; the Q4 FY24 earnings call; and ArusGrid, which records 4.32 MW installed at 30 June 2025.