Few loads are as demanding as a data centre. It runs flat out, every hour, every day, and it treats a momentary interruption as a serious incident. Now India is building a great many of them, and the power system is being asked to absorb that in a hurry.
The number, and how fast it moved
In July 2026 the Power Ministry put the figure at 26.3 GW of additional electricity demand from AI data centres by FY32 (the financial year ending March 2032). That load is expected to be served primarily by renewable energy capacity.
What makes the number striking is not its size but its velocity. In March of the same year, the ministry’s projection was 13.56 GW by the same date. The estimate roughly doubled within months.
For context, India’s peak power demand is projected to rise from 289 GW in FY27 to 388 GW by FY32, and further to 459 GW by 2035-36 on CEA’s National Generation Adequacy Plan. Against that, data centres are not the whole story — but they are a visible and unusually concentrated slice of it.
The problem renewables alone cannot solve
Here is the awkward arithmetic. A data centre draws a near-constant load, around the clock. Solar generates for part of the day. Wind varies. Committing to serve a flat load with variable generation leaves a gap every evening and every still night.
There are three ways to close it: buy from the grid whenever renewables fall short, burn diesel, or store energy. Only the third one both keeps the clean energy commitment intact and gives the operator control over cost.
This is why round-the-clock renewable contracts — where a generator commits to supply a firm profile using storage to fill the gaps — have become the procurement structure of choice for large clean-energy buyers. We explain how those contracts are built in our guide to round-the-clock renewable tenders, and the firming role storage plays in them on our renewable firming solutions page.
Where storage sits, and where it does not
A common confusion is worth clearing up, because data centres already have batteries.
| Layer | Duration | Job |
|---|---|---|
| UPS battery | Seconds to minutes | Ride through until the generator starts |
| Diesel generator | Hours to days | Extended outage backup |
| Grid-scale BESS | Hours | Shift energy, firm renewables, cut peak demand charges |
The UPS is a continuity device. It exists so that a power blip does not become a data loss event, and it is sized in seconds. A grid-scale battery is an energy device, sized in hours, and it exists to change when you buy power and what you pay for it.
They are complements, not substitutes. A site can have an excellent UPS and still be exposed to expensive evening tariffs, high contracted demand charges, and a renewable supply contract it cannot actually match hour by hour. That is the gap storage fills — the same demand-charge logic we set out for industrial sites in our article on cutting demand charges with BESS.
Diesel remains widespread for extended backup, but the running cost and emissions profile increasingly sit badly with operators carrying clean energy commitments. Our BESS versus diesel genset comparison works through that trade-off in detail.
What this means for you
- If you operate or are building a data centre: treat energy procurement as a design decision, not a utility bill. The choice between grid supply, a round-the-clock renewable contract and on-site storage changes your cost per MWh materially over a fifteen-year asset life — and it is far cheaper to design in than to retrofit.
- If you are a developer or IPP: this is demand for firm renewable supply, which means storage attached to generation rather than standalone arbitrage. Contracts written against a flat hourly profile are a different product from a plain solar PPA.
- If you are an industrial buyer watching this space: the same structures being built for data centres — firmed renewable contracts, behind-the-meter storage, microgrids — apply to any site with a steady load and a low tolerance for interruption. Our overview of BESS use cases by industry covers where else this pattern shows up.
Demand projections in this sector are moving quickly, and the Power Ministry’s own estimate roughly doubled inside a year. Treat every figure here as an August 2026 snapshot rather than a settled forecast, and verify current projections against live Ministry of Power and CEA publications before making investment decisions. To model storage against your own load profile and tariff, try our BESS savings calculator, or get in touch with our team.