Most compliance documents in Indian power tell you what to build. This one tells you what someone else will come and look at, every two years, for the life of the asset.
The Central Electricity Authority (CEA) — the technical body that writes India’s electrical safety and construction standards — has published a draft framework for mandatory external safety audits of battery energy storage plants. It sets out a report format, a technical checklist and a minimum audit procedure. Stakeholder comments were invited until 28 July 2026.
It is worth reading carefully even in draft, for a simple reason: it is the clearest statement yet of what an Indian regulator actually considers a safe battery. If you are specifying, buying or operating storage, the checklist is a de facto standard whether or not you will ever file the report.
What the framework requires
The obligation is straightforward. A generating station with a BESS installation gets an external safety audit, carried out by an accredited independent third-party agency, and submits the resulting report to CEA. Press reporting on the draft puts the frequency at once every two years, and the draft allows CEA to physically verify a plant on top of the paperwork.
The word doing the work is external. This is not your own team filling in a form. Neither the owner nor the equipment supplier can sign it off.
Who is allowed to audit you
The draft is unusually specific about the team, which is a useful signal in itself — CEA is trying to prevent the audit becoming a one-person walk-round.
| Requirement | What the draft prescribes |
|---|---|
| Team size | At least three auditors |
| Disciplines | One electrical engineering degree, one mechanical engineering degree, one fire and safety engineering degree (or an engineering degree with a diploma in industrial safety) |
| Lead auditor | One of the three must be a lead auditor under IS 18001 / ISO 45001 |
| Experience | One member with a minimum of 10 years in operation and maintenance, or erection and commissioning, of a power plant or hazardous process industry |
| Time on site | At least 3 days of field visit, and a minimum of nine man-days in total |
Nine man-days is the number to plan around. A three-person team for three days is the floor, not the target, and it tells you the audit is expected to involve opening panels and reading records rather than reviewing a slide deck.
The occupational health and safety part of the audit is conducted under IS 14489:2018, the Indian standard code of practice for occupational health and safety audits. If your site already runs to that standard, a good deal of the groundwork is done.
The checklist splits three ways
This is the part most people get wrong on first reading. The BESS technical checklist is not one list — it is three, with different burdens of proof.
Part I — what the auditor checks personally
These are the physical and layout questions an engineer can answer by standing on the site. Is the plant near a geological fault area, a high flood zone, a high tide zone or an avalanche-prone area? Is it designed for the extreme weather it will actually see? Is there room to move equipment in and out for installation, commissioning and maintenance? Is there minimum space separation between adjacent BESS enclosures and the nearest building? Can each battery rack disconnect itself?
Most of these are decided at the design stage and are effectively impossible to fix later. Enclosure spacing in particular is a layout decision — our guide to containerised versus cabinet form factors explains why footprint and separation drive each other.
Part II — the records you have to be able to produce
Fourteen categories of documentation. This is where a lot of otherwise well-built projects will struggle, because the certificates were someone else’s problem at the time of supply.
- Cell level: UL 1642, or IEC 62619 plus IEC 63056, from an ILAC-accredited laboratory
- Battery level: UL 1973, or IEC 62619 plus IEC 63056
- System level: UL 9540, or IEC TS 62933-5-1 plus IEC 62933-5-2
- Thermal runaway: UL 9540A characterisation reports for high energy-density chemistries, tested at an ILAC-accredited lab
- Transport: IEC 62281 / UN 38.3 certificates verified for batteries received
- Power conversion: IEC 62909-1 and -2, IEC 61683 efficiency procedure where solar-coupled, IEC 61000-6-2 and -6-4 for electromagnetic compatibility
- Grid interface: IEC 62116 anti-islanding test records
- Environment: IEC 60068-2-1, -2-2, -2-14 and -2-30 stress testing records
- Clearances: CEA or Chief Electrical Inspector to Government (CEIG) safety clearance before commissioning
- Commissioning and metering: infirm power injection test record filed with the transmission utility, calibrated meters, and metering records for energy accounting and deviation settlement
Two practical notes. First, the phrase ILAC-accredited laboratory appears repeatedly — a test report from an unaccredited lab is not evidence here. Second, most of this is generated once, at supply and commissioning, and then has to survive for fifteen years of filing. Our note on FAT, SAT and commissioning sign-off covers when each document is created; the audit is where you find out whether anyone kept it.
Part III — what the owner self-certifies
Around two dozen items where the plant owner states the answer. Several are hard numbers, and they are the most quotable part of the whole document:
| Self-certified parameter | Draft threshold |
|---|---|
| Output at end of 5 years | At least 90% |
| Output at end of 10 years | At least 80% |
| Output at end of 15 years | At least 70% |
| Minimum depth of discharge | 80% |
| PCS efficiency with isolation transformer | Not less than 95% |
| Round-trip efficiency, AC to AC including auxiliary consumption | Not less than 70% |
That last line deserves attention. AC to AC including auxiliary consumption is the honest way to measure a battery — it counts the cooling, the controls and the transformer losses, not just the cells. A DC-side number will always look better. If a supplier quotes you round-trip efficiency without saying where it was measured, that is the question to ask; our explainer on round-trip efficiency and degradation sets out why the two figures can differ by several percentage points.
The rest of Part III covers structures and foundations designed for the service life of the battery, seismic bracing to the National Building Code, container tolerance to temperature, pressure, explosion and vibration, hazard detection for smoke, gas, heat and flame with all four monitorable, break-glass sensors, automatic shutdown of the affected section within the OEM’s pre-set period, equipment earthing, and fault isolation in DC bus, inverter and AC switchgear rooms.
How the report is written
The output format is prescribed, which is helpful — you can prepare against it.
The report runs from an executive summary and introduction through the audit proper (occupational health and safety under IS 14489:2018, Schedule IV of the CEA regulation, and the BESS technical checklist), then into observations and recommendations, the ISO 45001 certificate, a conclusion and annexures.
The section that matters commercially is the observations table. Every finding gets an observation, a recommendation, a risk category of low, medium or high, and an action plan with a timeline for compliance. The completed report must be signed by both the audit agency and the BESS plant head before it goes to CEA.
Signing means owning. A plant head signing a report that contains three unresolved high-risk findings has created a dated record of them.
How this fits with the rest of the safety rules
It helps to keep three things separate.
- The CEA (Measures relating to Safety and Electric Supply) Amendment Regulations, 2026 are notified and come into force on 1 April 2027. They require two-fault tolerance, protection at four levels, BMS monitoring, and an independent fire safety audit filed with the Electrical Inspector. We covered them in detail in India’s new BESS safety rules.
- The CEA (Technical Standards for Construction of Electrical Plants and Electric Lines) Amendment Regulations, 2026, dated 22 June 2026, supply most of the construction clauses the checklist cites.
- This external safety audit framework is the recurring inspection built on top of both, filed with CEA rather than the state inspector.
Different filings, different recipients, overlapping evidence. The sensible approach is one document set that satisfies all three, not three separate compliance efforts. The underlying certification landscape — which IEC and UL standards prove what — is covered in our BESS safety standards guide.
What this means for you
- If you are buying a system now: treat Part II as a procurement annexure. Write the specific certificates into the supply contract, require them from ILAC-accredited labs, and take delivery of the documents at the same time you take delivery of the hardware. Chasing a UL 9540A report from a supplier three years after commissioning is a bad position to be in.
- If you are an operator: the nine man-days are the tell. Assume the team will want records, not assurances. Build the document set now, while the people who commissioned the plant are still reachable, and keep it in one place with the BMS history alongside it.
- If you are a developer or lender: risk-graded findings with compliance timelines are exactly the artefact technical due diligence and insurers have been asking for. A clean audit will start to price into terms. An adverse one, filed with the regulator and signed by your plant head, will too.
- If you are specifying equipment: the Part III numbers are a specification you can simply adopt — 90/80/70 capacity retention, 80% depth of discharge, and 70% AC-to-AC round-trip efficiency including auxiliaries. Our containerised and cabinet systems are built and documented against this evidence set, and a standalone BESS project is where these clauses bite hardest. If you want a view of what compliance costs on your own site before you commit, run the numbers on the savings calculator or talk to our engineering team.
This framework was published as a draft with comments invited until 28 July 2026, and the notified version may differ from what is described here. Policies, regulations and audit procedures change by notification. Treat this as a September 2026 snapshot, and verify the current text of the CEA framework — and any state-level requirements that sit alongside it — before relying on it for a project decision.