Apartment Generator Installation Laws in Bangalore

By the Property Law Team | Legal Brigade | Bar Council of Karnataka

When a Bangalore apartment building's association decides to install a diesel generator set or an inverter and battery bank in the building's common area -- the stilt parking, the pump room or a designated generator room -- to provide backup power for the common area lighting, the lifts, the water pumps and the security equipment during BESCOM power outages, the installation involves three distinct regulatory requirements: BESCOM's approval for the backup power system's connection to the building's electrical infrastructure, the building's existing electricity sanctioned load being adequate to accommodate the generator's parallel operation and the local authority's (BBMP or the fire department's) safety clearances for the diesel generator's fuel storage and exhaust system.

What Are the Regulatory Requirements for a Building Generator?

BESCOM governs the connection of backup power systems to the building's electrical infrastructure. A diesel generator does not connect to the BESCOM grid -- it operates in parallel with or as a substitute for BESCOM power during outages. However, BESCOM requires the building to have an automatic transfer switch (ATS) or a manual changeover switch that prevents the generator from feeding power back into the BESCOM grid (which is dangerous for BESCOM linesmen working on the grid during outages). BESCOM may also require the generator's installation to be certified by a licensed electrical contractor and a BESCOM-approved engineer.

For an inverter and battery bank system (which stores BESCOM power and supplies it during outages), BESCOM requires the building's electricity connection to have adequate sanctioned load to charge the battery bank. If the battery bank's charging requirement exceeds the building's sanctioned load, the building must apply to BESCOM for an enhanced load sanction before installing the inverter system. An inverter drawing more power than the sanctioned load creates overloading that can damage the transformer and trigger BESCOM enforcement.

What Is the Association's Process for Approving a Building Generator?

1. Commission a licensed electrical engineer to assess the building's power requirements -- common area lighting, lifts, pumps, security cameras -- and specify the generator's capacity in kVA.

2. Obtain BBMP's and the fire department's clearances for the generator room -- diesel generators require a fire-safe enclosure with exhaust ventilation, a fuel storage area that meets safety specifications and acoustic enclosure to limit noise.

3. Pass a general body resolution approving the generator purchase and installation -- specifying the capacity, the vendor, the cost and the maintenance arrangement.

4. Have a BESCOM-approved electrical contractor install the ATS or changeover switch -- ensuring the generator cannot feed back into the BESCOM grid.

5. Obtain the BESCOM-required installation certificate from the licensed electrical contractor and submit it to BESCOM's distribution section.

Q1. What capacity generator is typically needed for a 100-flat apartment building's common areas?

A 100-flat building typically needs 25-40 kVA for common area backup (lifts, common lighting, pumps, security systems and main gate). A 62.5 kVA or 82.5 kVA generator provides comfortable headroom. The specific capacity depends on the building's lift type (the lift motor's starting current is the peak demand), the pump motor ratings and the common area LED lighting load.

Q2. What is an automatic transfer switch and why is it mandatory?

An ATS (Automatic Transfer Switch) automatically switches the building's common area electrical supply from BESCOM to the generator when BESCOM power fails -- and switches back when BESCOM power is restored. The critical safety function is the ATS's anti-paralleling protection -- preventing the generator from operating in parallel with BESCOM (which would feed the generator's power back into the BESCOM grid, creating a danger for BESCOM linesmen). BESCOM mandates the ATS for all generator installations connected to the building's electrical system.

Q3. Does the generator require a BBMP building plan amendment?

A generator room installed within the building's existing structure (the stilt parking, the pump room or a designated room) does not typically require a BBMP building plan amendment -- it is treated as a utility installation within the existing footprint. However, if a new structure is built to house the generator (an external generator enclosure), it may require BBMP's approval as a new construction.

Q4. What noise and emission standards apply to diesel generators in Bangalore?

The Central Pollution Control Board specifies noise limits for diesel generator sets: the generator's sound pressure level should not exceed 75 dB at a distance of 1 metre from the enclosure. The generator manufacturer must provide noise-rated equipment and an acoustic enclosure. Emission standards for diesel generators are governed by the CPCB's genset emission norms. KSPCB (Karnataka State Pollution Control Board) may require consent for generator sets above specified capacity.

Q5. Can the association charge individual flat owners for the generator's running costs?

Yes -- the generator's diesel consumption and maintenance are ongoing expenses that the association charges to all flat owners through the monthly maintenance. The cost allocation is typically based on the flat's size (UDS or equal share). Some associations separately meter the generator power consumed by flats that want generator backup for their individual units -- installing a second sub-meter for generator power to the flat.

Q6. What is a kVA and how does it relate to the building's sanctioned load?

kVA (kilovolt-ampere) is the apparent power rating used for generators and transformers. The building's BESCOM sanctioned load is in kW (kilowatts) -- actual power. For a building with a 100 kW sanctioned load, a 125 kVA generator (with a 0.8 power factor, delivering 100 kW) approximately matches the building's requirement. A generator with too low a capacity will overload on startup (particularly the lift motor's starting current) and trip off.

Q7. Can a flat owner refuse to pay for the generator if they do not use it?

The generator benefits all flat owners through: lift backup, common lighting, pump backup (ensuring water supply) and security system continuity. These are common area benefits that all flat owners share. A flat owner cannot opt out of the generator maintenance cost on the ground that they personally prefer to manage without backup power. The generator is a common area asset managed for the benefit of all.

Q8. What happens when the generator's maintenance contract lapses -- is the association liable?

An association that allowed the generator's maintenance contract to lapse and the generator failed to start during a fire or emergency may face questions about its duty of care to residents. Regular preventive maintenance (quarterly service, monthly test run) and an active maintenance contract are best practices for managing the generator as a safety asset. The association's insurance policy should specifically cover the generator and its operation.

Q9. Does a generator installation affect the building's fire NOC?

Yes -- a generator room with diesel fuel storage is a fire risk addition to the building. The Karnataka Fire and Emergency Services (KSFES) may require the fire NOC to be updated to cover the generator room's fire safety measures (automatic fire suppression, fire door, adequate ventilation, fuel storage compliance). The fire NOC update should be obtained before the generator is commissioned.

Q10. How does Legal Brigade assist associations with generator installation governance?

Legal Brigade confirms the regulatory clearances needed (BESCOM ATS, BBMP generator room, KSFES fire NOC update, KSPCB if applicable), manages the general body resolution process for the investment and cost allocation, reviews the vendor's installation contract for ATC compliance and maintenance obligations and advises on the association's insurance update to cover the generator and fuel storage.

Your Bangalore apartment association wants to install a diesel generator or an inverter system for common area backup power but is uncertain about the BESCOM approval, load sanction and BBMP clearances?
Legal Brigade confirms the regulatory requirements and manages the general body resolution and vendor contracting.
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