Company
We are building cooling for India's AI data centers that runs on sunlight and uses no water.
India is building data centers faster than almost anywhere. Most of that capacity is going into cities that already ration water in summer, on a grid that throws away solar power at noon and strains at night.
Cooling sits in the middle of all three problems. It is the largest non-compute load in a data hall, the reason data centers use water, and the load that peaks at the worst time for the grid.
We think the fix is simple to state: make the cold when the sun is out, keep it in a tank, and use it later. The engineering is in making that reliable enough for a data center and cheap enough that operators choose it on cost alone.
Operators should choose this because it is cheaper. The water and carbon savings come with it.
We own the plant and sell the cooling. If it does not perform, that is our problem.
Targets are labelled as targets. Measured data replaces them as soon as we have it.
Designed for 46°C afternoons, monsoon months and Indian tariffs from the start.
Reference design
Complete the 5 MW reference model and cost model. Speak with data center operators across five hubs.
Three pilots
One Sunvault module each on 1–2 MW halls, measured through a full summer and monsoon.
First 10 MW plant
A commercial deployment priced on measured pilot data.
Coldsun is at the design stage. We have a reference model, a cost model in progress, and no installed plants yet. The images on this site are illustrative renders.
If you operate a data center in India and want to be one of the three pilot sites, we would like to hear from you.