No, a captive behind-the-meter (BTM) BESS does not require DISCOM approval if it is used strictly for internal facility backup and peak shaving without exporting electricity back into the utility grid.
However, DISCOM approval is mandatory if the system is configured to export stored power to the grid under net-metering/feed-in tariffs. In addition, commercial installations exceeding sanctioned limits or high voltage thresholds require safety clearance from the Chief Electrical Inspector to Government (CEIG).
Captive Behind-the-Meter vs Grid Export
The regulatory requirement for energy storage in India depends fundamentally on the point of electrical coupling and whether power ever flows in reverse through your DISCOM revenue meter:
| Installation Type | Power Flow Direction | DISCOM Approval Needed? | CEIG Approval Needed? |
|---|---|---|---|
| Captive Behind-the-Meter (BTM) | Internal Only (Zero Grid Export) | No Formal Approval (Informational notification) | Yes (If total capacity > 10–25 kW) |
| Solar + BESS Net Metering | Bidirectional (Solar export to grid) | Mandatory DISCOM Approval | Yes (Standard solar/electrical inspection) |
| Utility Grid-Interactive / VGF | Bidirectional (Grid arbitrage & export) | Mandatory DISCOM & STU PPA | Yes (Full substation CEIG commissioning) |
When DISCOM Permission is Required
If your facility plans to export battery power back to the grid to monetize Time-of-Day feed-in tariffs, or if you are installing a high-capacity system (e.g. over 500 kVA), you must follow the state distribution licensee’s standard grid interconnect procedure:
- Application Submission: Submit single-line diagrams (SLD), system capacity, inverter type-test certificates, and sanctioned load details to your local DISCOM division.
- Technical Feasibility Study: The distribution utility verifies distribution transformer (DT) loading and short-circuit capacity at your point of common coupling (PCC).
- Bidirectional Smart Metering: The utility installs or reprograms a four-quadrant bidirectional TOD energy meter capable of logging active and reactive import/export units.
Electrical Inspectorate (CEIG) Approvals
Under the Central Electricity Authority (Measures Relating to Safety and Electric Supply) Regulations, all commercial, industrial, and high-occupancy buildings must obtain clearance from the state Electrical Inspectorate (CEIG) before energizing large electrical apparatus:
- Drawing Approval: Verification of system earthing (separate neutral and equipment earth pits), cable trench separation, and DC breaker sizing.
- Fire Clearance: Inspection of built-in automatic aerosol or clean-agent fire suppression systems and ventilation pathways.
- Safety Interlocks: Verification of emergency-stop (E-Stop) pushbuttons and door-interlock isolation switches.
Because CLN All-in-One cabinets (such as the CLN All-in-One Pro Series) arrive pre-engineered and factory tested with integrated aerosol suppression and earthing terminals, CEIG safety inspections are typically completed in a single site visit.
Not Needing Permission Is Not the Same as Saying Nothing
The commonest and most expensive mistake here is treating “no approval required” as “no paperwork required”. Several states expect a behind-the-meter system to be notified to the DISCOM before commissioning even when no permission is needed — a written intimation with the single-line diagram, the inverter’s anti-islanding type-test certificate and the connected capacity.
It costs an afternoon. Skipping it is what turns a routine meter inspection into a disconnection notice, and it is the reason to send the letter even where you are confident none is due.
Storage is also moving out of the general supply code and into its own rules: state commissions including Andhra Pradesh and Rajasthan have issued BESS-specific regulations covering ownership models, co-location and grid services. Expect your state’s position to be written down somewhere more specific than the supply code, and expect it to have changed within the last two years.
Anti-Islanding & CEA Technical Safety
The Central Electricity Authority (CEA) Technical Standards for Connectivity of the Distributed Generation Resources mandate that any distributed inverter must incorporate active and passive anti-islanding protection (IEEE 1547 / IEC 62116 compliance).
Two different timings get confused here, and DISCOM engineers notice. Anti-islanding is how quickly the inverter stops energising the utility line once the grid is gone: IEC 62116 and IEEE 1547 require it inside two seconds, and it cannot be faster than tens of milliseconds by design, because the inverter has to actively perturb the supply and watch the response to be sure an island really exists rather than tripping on a passing voltage dip. Transfer time is how quickly your own loads are picked back up, and that is where CLN systems are under 5 ms — fast enough that PLCs, servers and VFDs never see an interruption. The system then runs the facility as an isolated microgrid with no path back onto a disconnected feeder. Learn more about India's energy storage standards on our energy storage policy guide.
Need Compliance Documentation or SLD Schematics?
Download our engineering compliance dossier, including CEA type-test certificates, anti-islanding test reports, and CEIG approval templates.
Frequently asked questions
Does a captive behind-the-meter BESS require DISCOM approval in India?
In most states, a captive behind-the-meter (BTM) system that runs purely for internal backup and peak shaving, connects downstream of the consumer meter and never exports to the grid does not need a separate DISCOM interconnection approval. Electricity is a concurrent subject, though, and the detail lives in each state regulator’s supply code rather than in a single national rule, so confirm the position with your DISCOM before ordering. Where the site already has grid-tied solar or a sanctioned load change is involved, treat approval as required.
When is formal DISCOM permission mandatory for a BESS in India?
Formal DISCOM approval is legally required in three cases: 1) If the BESS exports stored electricity back into the utility grid under net-metering or gross-metering schemes, 2) If the system is co-located with a grid-tied solar plant above the sanctioned contract demand, or 3) If the installation capacity exceeds 1 MVA / high-tension (HT) grid interconnect thresholds.
Is an Electrical Inspectorate (CEIG) clearance required for BESS in India?
Usually, yes. Under the CEA (Measures relating to Safety and Electric Supply) Regulations, installations operating above 650V require inspection and drawing approval from the Chief Electrical Inspector to Government (CEIG) before being energised. Below 650V the trigger is set by each state, and the connected-load thresholds differ enough between states that the only safe answer is to check your own state’s rule. The inspection covers CEA earthing, fire clearance and switchgear safety standards.
What is anti-islanding protection and why does the utility mandate it?
Anti-islanding is a mandatory safety mechanism in the BESS inverter. If the utility supply fails while the inverter is still exporting, the inverter must detect that it is feeding an unintentional island and stop energising the line, so it cannot backfeed a feeder that a lineman believes is dead. IEC 62116 and IEEE 1547 require this within two seconds; certified inverters typically act well inside that. This is a separate specification from load transfer time, which is how quickly the system picks the site back up — under 5 ms on CLN All-in-One systems.
Can a BESS be installed on a facility with existing rooftop solar net metering?
Yes. CLN All-in-One hybrid systems integrate seamlessly with existing net-metered solar setups. The BESS sits between the solar array and the facility loads, storing excess solar generation before exporting surplus energy to the utility grid via the bidirectional net meter.