02. The Geography
The southern coast of Tamil Nadu combines three things India needs at gigawatt scale: a cooling sink that does not compete with drinking water, proximity to a growing submarine-cable corridor, and land large enough to build on.
How Setupuram cools an AI data centre with the sea. Under 2 minutes. Click to play.
An internal cooling liquid runs a closed loop from the racks to a heat exchanger and back. A separate seawater intake and return loop absorbs the heat through sealed metal plates. The two circuits never mix. The seawater returns to the sea within tightly controlled temperature limits. No potable water is consumed for primary heat rejection.
Heat transfers. Water does not mix.
An inland campus at 100 MW: about 2 million litres of freshwater a day. Setupuram, coastal: zero potable water for primary heat rejection.
Source: Council on Energy, Environment and Water, 2026.
Chennai currently hosts eight international submarine cable systems and absorbed roughly half of India's H1 2026 data-centre supply. Land and power in Chennai are now constrained. The southern coast, Ramanathapuram and southward, is the logical expansion vector for the next tranche of gigawatt-scale infrastructure. Fibre backhaul to Chennai is well-established; future cable landings on the southern coast are a strategic prize.
The sea becomes part of the infrastructure advantage, without competing with people or farming.
Sources: JLL India Data Centre Market Dynamics, August 2026. Council on Energy, Environment and Water, 2026. Setupuram consortium analysis.
Back to home