Power & Energy for data centers in India

The constraint that shapes everything else

Power is the binding constraint on data center growth in India and the item most often underestimated in a programme. A 50 MW campus needs a dedicated 220 kV or 132 kV connection, which means load sanction from the discom, a feasibility study by the transmission utility, bay allocation at the substation and a dedicated line with its own right of way. Across the major metros that process takes 12 to 18 months after application, and it cannot be compressed by spending more.

Inside the fence, the electrical system is 40 to 50 percent of the mechanical, electrical and plumbing budget and almost every major item is on an extended lead time. Power transformers run 8 to 12 months, MV switchgear 6 to 10, modular UPS 4 to 8, lithium-ion battery systems 4 to 8 depending on cell supply, and 2 to 3 MVA generator sets 6 to 9. Indian projects compete with hyperscale buyers in the US and Europe for the same factory slots, and the lead times lengthened materially during the AI build-out.

The implication is a procurement programme that starts at basis of design, not at tender. Owners that place long-lead electrical orders against a performance specification before the civil contractor is appointed open on time; those that wait for a complete design package routinely lose six to nine months.

Topology and sizing decisions that drive cost

Redundancy should be set by the Tier target and the customer contracts, not by habit. A distributed redundant or block redundant scheme meets Tier III concurrent maintainability at materially lower capital cost than 2N, and 2N+1 is rarely justified outside financial-services tenancies. The common Indian pattern for a colocation campus is distributed redundant electrical with N+1 mechanical.

Size the electrical plant to the IT load you will actually sell in each phase plus the mechanical load at the design ambient, not to a nameplate campus figure. Over-sized transformers and switchgear tie up capital and run inefficiently at low load; modular UPS and generator paralleling let the plant grow with the sold load. Design the MV ring and the civil envelope for the final campus and populate them in phases.

Battery chemistry has settled. Lithium iron phosphate UPS batteries cost more than VRLA upfront but need a third of the floor space, last two to three times longer, tolerate higher temperatures and carry a battery management system that reports state of health. For a facility with a 15-year life, lithium is cheaper. Specify IEC 62619 safety compliance, thermal runaway containment and BMS integration with the DCIM.

Generators, fuel and emissions

Standby generator sets for a data center must carry full load on grid failure for extended periods without derating, which means a data center continuous or mission-critical rating, not a standby rating, with paralleling switchgear and load-sharing controls. Diesel remains the default in India; HVO-ready engines are available and worth specifying for future fuel flexibility. Gas is viable only on the few pipeline corridors near Mumbai, Gujarat and parts of the NCR.

Emission compliance is tightening. CPCB norms for diesel engines above 800 kW require selective catalytic reduction or equivalent treatment on new installations, and several state pollution control boards cap annual run hours and require low-sulphur fuel and stack monitoring. Fuel storage above threshold quantities triggers PESO licensing. Build these into the generator package rather than discovering them at consent-to-operate stage.

Open access, group captive and the PPA

The power strategy now spans three contracts: the grid connection, on-site backup and the energy supply itself. Consumers above 1 MW can buy power under open access from generators other than the discom, paying wheeling, transmission and the state's cross-subsidy and additional surcharges. Under a group-captive structure, where the consumer holds at least 26 percent of the generator's equity and takes at least 51 percent of its output, the cross-subsidy surcharge falls away in most states and landed cost can run 15 to 30 percent below the industrial tariff.

The Green Energy Open Access Rules 2022 simplified renewable open access, but the economics still turn on state-specific banking rules, scheduling and deviation penalties, and the trajectory of surcharges. Model landed cost over the PPA tenor with those variables before signing, and align the PPA start with the facility's energisation date so you are not paying for banked energy you cannot use.

Evaluating electrical bids

Harmonise the specification before tender so bids are comparable: the same single-line diagram, the same ratings at the same ambient, the same redundancy, the same testing and documentation requirements. Weight the technical evaluation on type-test certificates, factory references in Indian data centers, part-load efficiency curves for UPS (above 96 percent in double conversion at 40 percent load is the current benchmark), service presence in your city and spares lead times. Price is compared only after that normalisation.

Negotiate the items that hurt later: firm delivery dates with liquidated damages, factory acceptance test witness rights, extended warranty on UPS and batteries, and a spares package delivered with the equipment. For the grid connection, keep a dedicated owner who tracks the utility weekly; it is the one item no contractor controls.