STT GDC Chennai 3 is 15 MW under construction. With Chennai 4 at 17 MW it forms a 32 MW pipeline — 110% of the 29 MW the company actually operates in Chennai. That is the most important fact in the Tamil Nadu file and it has no date attached to it. No handover date, no rack count, no floor area and no PUE is published for either building. In a market where tenants are contracting two years ahead, an undated 32 MW is what everyone is guessing about.
1At a glance
2A pipeline larger than the business
Chennai is where the Indian supply question is sharpest, and STT’s position is a clean illustration of it.
| Measure | MW | Reads as |
|---|---|---|
| Operating | 29 | what exists and can be sold now |
| Under construction | 32 | what will exist, on an unknown schedule |
| Borrowed from another campus | 7.2 | counted in a headline it does not belong to |
| Headline | 68 | all of the above, added together |
| Pipeline as a share of operating | 110% | the market roughly doubles when it lands |
A pipeline the size of the existing business is normal for a growth market and alarming for a market already under stress. Chennai’s rents have risen because supply lagged demand for three years. Thirty-two megawatts of new STT capacity would relieve that — if it lands in 2027.
If it lands in 2029, the shortage lasts another three years and the rents keep climbing. The megawatts are identical in both scenarios.
3Why the date matters more than the megawatts
This page could have been built around 15 MW. The number that actually matters is the one that is missing.
| If Chennai 3 hands over | Then |
|---|---|
| 2027 | Chennai supply loosens and the 2028 renewals price flat |
| Early 2028 | the market holds at today’s rents through one more cycle |
| 2029 or later | three more years of shortage, and tenants lock long terms |
| Never, or shelved | the ₹4,200 crore programme was a plan, not a build |
| Unknown — the current position | every tenant and every broker is guessing differently |
The last row is where the market actually is. A 32 MW pipeline with no published date is not neutral information — it changes how incumbents price renewals and how tenants structure options, and it does so differently for each player.
The specific advice for a Chennai tenant: ask for a handover date in writing before signing a 2028 renewal at today’s rate, and treat the 32 MW as arriving in 2029 unless someone can show you a construction schedule.
When do Chennai 3 and 4 hand over. Two dates would resolve the biggest unknown in the Tamil Nadu market and they are the cheapest facts in this file.
The company clearly knows. It has a ₹4,200 crore programme, a construction contractor and a commissioning sequence.
4Procurement
5Limits and open questions
- No handover date. The single most important missing fact in Tamil Nadu.
- No racks, floor area or PUE. The building’s density ceiling is unknown.
- No construction milestone. Under construction covers everything from piling to fit-out.
- The ₹4,200 crore programme is unscoped and cannot be matched to this building.
- Counted at zero, correctly, because it does not exist yet — unlike some competitors’ counted pipeline.
- What would close it. A handover date and a design density.
6Sources
Sources: STT GDC India Chennai city page, STT GDC India Chennai multi-campus expansion announcement, STT GDC India facility pages for Chennai, STT GDC India corporate site, and Indian market commentary on Chennai data centre supply and rents.