By Adam Shafiullah, CTO, Technavious
India is building data centres faster than at any point in its history, and the pace is now the story. Operators announced roughly 30 large projects between March 2025 and April 2026, adding about 3.5 GW of planned capacity across the country [1]. Colocation capacity crossed 1.5 GW by the end of 2025 and continues to climb [2]. Yet a quieter fact sits beneath those headlines. Across many large, multi-phase campuses, less than 20 percent of announced capacity is currently live [1]. The gap between what has been announced and what is actually operating is where execution becomes decisive, and data centre commissioning is the discipline that closes it.
Commissioning is the structured process through which construction outcomes are validated against operational requirements. It is the point at which a facility stops being a set of installed systems and becomes infrastructure that can be trusted to carry live workloads. For any operator in India’s current build cycle, understanding how commissioning works, and where it tends to fail, is no longer a specialist concern. It is central to whether a project reaches revenue on schedule.
Commissioning unfolds across six defined levels
Data centre commissioning follows a sequence of levels that take a facility from design review through to operational handover. It begins at Level 0 with a design review and an audit of the Owner’s Project Requirements, then moves to Level 1, where equipment such as UPS systems, chillers and switchgear is tested at the factory before it ships. Levels 2 and 3 cover on-site work, verifying that installation matches the approved design and then energising and validating individual systems. The process culminates in Level 4 Functional Testing, where system sequencing, interlocks and building management responses are validated under simulated stress, and Level 5 Integrated Stress Testing, where the whole facility is tested under concurrent failure scenarios. In extended frameworks, Level 6 covers documentation, operator training and the formal handover to operations.
Levels 4 and 5 are where commissioning earns its value. At Level 5, a facility faces several failures at once, such as a utility outage combined with generator lag and a thermal overload, all introduced together to confirm that N+1 redundancy holds and that the facility recovers within seconds. This is the stage that protects against the kind of integration faults that individually tested systems routinely hide. One industry study found that 46 percent of backup power failures occurred at the integration points between components that had each passed their own standalone tests [3]. Testing the facility as a whole, rather than as a collection of parts, is what exposes those faults before they reach live operation
Most commissioning defects are inherited, not created
The most important insight in data centre delivery is that commissioning quality is determined before commissioning begins. Around 70 percent of latent defects surface during the advanced testing levels [4], which makes it tempting to treat commissioning as the stage where quality problems originate. The evidence points the other way. Those defects are largely produced earlier, during the build phase, through decisions about vendor selection, installation governance, documentation discipline and pre-commissioning verification. By the time a facility reaches Level 5, the commissioning team is not creating the problem. It is discovering one that was built in months earlier.
This explains why so many projects lose time at the testing stage. When the build phase is managed without rigorous engineering oversight, commissioning teams inherit a facility that does not match its own design record. Equipment may have been substituted without review. Installation details may have been adjusted on site to solve a local problem, with no update to the documentation that commissioning test protocols depend on. Each of these decisions becomes a latent defect waiting to surface during Functional or Integrated Stress Testing. The commissioning team then spends its time reconstructing what was actually built rather than validating what was designed.
Build-to-commissioning continuity is the practical fix
The remedy is continuity between the build and commissioning phases, achieved by keeping engineering oversight consistent across both. When the same engineering team that designed and governed construction also oversees commissioning, design intent travels intact through the lifecycle. Test plans can rely on validated design parameters instead of reconstructing assumptions partway through testing. Inspection and Test Plans established during construction flow directly
into commissioning protocols rather than being rebuilt from scratch. Pre-commissioning verification in the final build phase hands the commissioning team a documented, validated facility rather than a set of open questions.
The effect is measurable. Organisations that apply structured vendor qualification and multi-discipline governance during the build phase typically see roughly a 30 percent reduction in anomalies discovered during Functional Testing [4], because known-good equipment with a documented test history behaves predictably under stress. The same governance model reduces rework during the installation and startup levels and allows projects to move faster into the advanced testing stages where operational readiness is genuinely confirmed.
India adds its own layer of complexity
India’s operating environment makes this continuity harder to achieve and more valuable when it is. Transformer lead times stretch to between 12 and 14 months, and grid connection approvals remain constrained in several regions [5]. Procurement decisions therefore have to be made early and sequenced deliberately, because a late equipment order cannot be recovered by commissioning expertise later. The shift towards AI workloads adds further pressure. Liquid cooling has reached a significant share of new builds, and rack densities are climbing well beyond conventional levels, which means commissioning teams must validate thermal performance that earlier facilities never had to consider.
These conditions reward operators who plan commissioning into the build phase rather than treating it as a later discovery. Thermal protocols can be validated during equipment installation. Live environment procedures, needed when an existing facility is expanded while it keeps running, can be proven during pre-commissioning rather than improvised on site. Regulatory and certification requirements can be aligned to construction practice from the first phase, so that commissioning-stage compliance becomes confirmation of prior work rather than remediation.
What this means for operators
For any organisation planning a data centre in India, the practical question is not simply who will commission the facility. It is whether the build partner is applying the governance, vendor management and pre-commissioning verification standards that commissioning will later depend on. A facility that commissions cleanly reaches operational status on schedule, with documented reliability and the confidence that stress testing has genuinely validated its performance. A facility
that does not commission cleanly absorbs delay and cost at the worst possible point in the project, close to the revenue date.
As India works to convert several gigawatts of announced capacity into operating infrastructure, commissioning is best understood as a competitive discipline rather than a closing formality. The operators who treat build and commissioning as one continuous engineering responsibility, rather than two separate engagements, are the ones who will turn announcements into live, reliable data centres. Technavious works across the full project lifecycle, from design and build governance through to commissioning and handover, helping operators close the gap between planned capacity and operational reality.
References
[1] India added roughly 3.5 GW of announced capacity across about 30 projects from March 2025 to April 2026, with under 20 percent of announced capacity currently live: CRN Asia (April 2026).
[2] India’s colocation capacity crossed 1.5 GW by end-2025: CRN Asia (March 2026).
[3] 46 percent of backup power failures occur at integration points between independently tested components: OPAL-RT (February 2026).
[4] Commissioning levels, 70 percent of latent defects surfacing at advanced testing, and approximately 30 percent fewer Functional Testing anomalies under structured build governance: TIA Online, Cadence Now (November 2025), Construct and Commission (November 2023).
[5] Transformer lead times of 12 to 14 months and constrained grid connection approvals in India: DCByte (January 2026), The Birm Group (November 2025).
