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STT Chennai Ambattur campus (Chennai 2, 3 and 4)

Chennai, Tamil Nadu, India · Chennai market · location approximate to district level

STT Chennai Ambattur campus (Chennai 2, 3 and 4) is a data center project in Chennai, India, operated by STT GDC India. It is operational and expanding. It is planned for 58 MW of IT load. The operator reports 40 MW running.

Latest change on record: moved to expanding on 20 February 2026.

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Stage
Expanding
Planned IT load
58 MW
Running now
40 MW
Operator
STT GDC India
Colocation
AI workloads
Likely
Evidence grade
Verified
Will it get built?Built7 of 7 gates passed
✓ Land secured✓ Power arranged✓ Approvals granted✓ Money committed✓ Tenant or own use✓ Builder appointed✓ Construction started

Build odds is ArusGrid's reading of the public record, not a forecast, a rating or advice. It counts the gates this project has passed in public sources. Private progress does not show, a passed gate can be undone, and projects that pass every gate still stop. The method has not yet been tested against outcomes. How it works.

How India approves, powers and taxes data centers is on Data center rules in India.

How well evidenced is it

Running capacity. The site is operational or expanding. On record: named funder, three or more sources, dated source in the last 24 months. Criteria.

AI workloads

StatusLikely

Operator markets Chennai 4 as AI-ready; no cooling or GPU disclosure.

Access to AI chips

GradeNo US licence required

This country carries no US destination-based licence requirement for advanced AI chips as the rules are enforced today. Access is a commercial matter between the project and its vendors. Criteria.

Phases

Chennai 2 and 3 · Operational40 MW
Chennai 4 · Under construction18 MW

Stage history

2024-02-01Operational · datacenterdynamics.com
2026-02-20Expanding · datacenterdynamics.com

Who is behind it

OperatorSTT GDC India · Colocation
Funder, EquityST Telemedia

Who uses the compute

Checked on 2026-10-02. No user of this capacity is on the public record. ArusGrid read the operator's releases, the landlord's and contractors' exchange filings, regulator and lender documents and interconnection records. Most colocation leases are confidential, so this says nothing about occupancy.

Money at this site

ArusGrid estimate, building costabout US$327m to US$487m

No figure has been announced. This range is 58 MW of planned IT load times a published benchmark of US$6.64 per watt for Mumbai, plus or minus 15 percent, with 10 percent more at the top for liquid cooling because the project is AI-positioned. It covers the building and its mechanical and electrical plant. It excludes land, grid works, servers and fees.

Benchmark: Turner & Townsend Data Centre Construction Cost Index 2025, as reported by Data Storage Asia. An estimate is never added to any total on the site.

Platform deals that include it

STT GDC India Rs 4,200 crore Tamil Nadu MoU
Country programme, 2026-02
US$504m

Platform capital spans several sites. It is never added to this project's own figure.

Colocation price per kW of IT load per month

ArusGrid estimate, grade CINR 6,800 to INR 8,900 (about USD 81 to 106)

ArusGrid estimate, grade C. Published band for this country. Priced on the hyperscale band, which already reflects anchor deals. No usable capex for this site. Electricity unstated in the band. An estimate, never a quote, computed by fixed rules published on the Colo prices page and never counted in any total.

market band, hyperscale (2024-12)INR 6,800 to INR 8,900 Cushman & Wakefield for Sify Infinit Spaces, 2025-10-16
Power supply
Renewable power dealCleanMax (Clean Max Enviro Energy Solutions) · 21 MW · Apr 2026 Inferred by ArusGrid source ↗
21 MWp new solar in Tamil Nadu in captive mode; STT GDC India takes 26% equity in the project; cumulative CleanMax-STT partnership >130MW · Release says the PPA powers STT GDC's Chennai data centres without naming sites; capacity is MWp solar, not facility load · Covers the operator's wider portfolio in this country, not this site alone.
Why we think so. Exchange press release by supplier
Grid supplyTNPDCL (Tamil Nadu Power Distribution Corporation, formerly TANGEDCO) · 85 MW · Dec 2025 Confirmed source ↗
The December 2025 EC amendment raised the approved power requirement from 49MW (TANGEDCO) to 85MW (TNPDCL). This is total power demand, not IT load. The approved layout includes a TNEB GIS building and an STT GIS building on site. · Applies to the whole campus.
On-site solarSTT GDC India (on site) · 0.185 MW · Jul 2026 Confirmed source ↗
Rooftop and ground-mounted solar PV of 185kW installed. · From the half-yearly EC compliance report for October 2025 to March 2026. · Applies to the whole campus.
Grid supplyNot named in source · 110kV · Oct 2024 Confirmed source ↗
About 50% of power from wind and solar. 185kW onsite solar. · Chennai 2 factsheet lists a dedicated 110kV supply feed, N+1 generators and 30 hours of fuel at full load. Applies to Chennai 2.
Water and cooling
WaterMains drinking water · CMWSSB (Chennai Metro Water) · 215 m³ a day Confirmed source ↗
Approved fresh water fell from 418 KLD in the earlier EC to 215 KLD. Recycled water of 26 KLD goes to flushing and greenbelt. A 45 KLD MBR sewage plant is proposed.
Cooling Confirmed source ↗
Approved fresh water is 215 KLD, of which 200 KLD is HVAC make-up and 15 KLD domestic. The compliance report refers to on-site cooling towers. Chiller type is not stated.
CoolingAir cooled Confirmed source ↗
STTGDC says Chennai 2 uses a CRAC cooling system with 2.7 million litres of water storage.
WaterMains drinking water · CMWSSB (Chennai Metro Water) · 215 m³ a day Confirmed source ↗
The EC amendment approves a total fresh water requirement of 215 KLD from CMWSSB: 15 KLD domestic and 200 KLD for HVAC. This replaces 418 KLD (including 303 KLD of fresh water for HVAC) in the 2019 EC. Treated sewage is reused for toilet flushing and greenbelt, from a proposed 45 KLD MBR sewage plant. 17 rainwater percolation pits are approved.

Sources

  1. STT GDC India Strengthens Its Market Presence in Chennai with Multi-Campus Expansion and INR 4,200 Crore Investment Commitment (STT GDC, 2026-02-19)
  2. STT GDC India launches data center in Chennai, targets potential IPO (DCD, 2026-02-20)
  3. STT GDC breaks ground on third Chennai data center campus in India (DCD, 2024-02-01)
  4. CleanMax and STT GDC India Scale Renewable Energy Partnership Beyond 130 MW to Power India's Sustainable, AI-Ready Digital Infrastructure (NSE / Clean Max Enviro Energy Solutions, 2026-04-01)
  5. EC Chennai Ambattur December 2025 (SEIAA-TN Amendment to Environmental Clearance, File No. 12753) (SEIAA Tamil Nadu, hosted by STT GDC India, 2025-12-19)
  6. Half Yearly Compliance Report 2026 - Chennai Ambattur (1 October 2025 - 31 March 2026) (STT GDC India (PARIVESH submission), 2026-07-04)
  7. STT Chennai 2 Factsheet (STTGDC India, 2024-10-14)
  8. Colocation Data Centre in Chennai (STTGDC India)
  9. INFRAINTEL: STT GDC India's Customer Newsletter 2026 (STT GDC India)

More in Chennai

Also run by STT GDC

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