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Rooftop Solar for Apartments and Flats: What Indian Residents Need to Know

The Apartment Solar Question

More than half of India’s urban population lives in multi-unit apartment buildings — yet most solar guides are written entirely for independent homeowners with their own rooftop. If you are a flat owner, the question is not as simple as “get solar,” but there are real pathways available.

This guide explains what is actually possible for apartment residents, what the DISCOM rules look like, and how housing societies can take advantage of group net metering to reduce electricity costs for all residents.

The Core Challenge for Apartment Owners

An individual flat in a multi-story apartment building typically does not have:

For a grid-connected net metering system, the DISCOM needs a single consumer connection point where the solar system is installed and metered. In a flat, this is rarely possible on an individual basis.

Group net metering is the standard path for apartment buildings in India. Under this model:

  1. The housing society (RWA or cooperative) installs a rooftop solar system on the common terrace
  2. The system is registered under the society’s DISCOM connection or a designated main meter
  3. Surplus solar units exported to the grid are credited to a group account
  4. Credits are distributed to participating flat owners’ individual electricity meters in an agreed ratio (usually proportional to flat size or electricity consumption)

How the credit distribution works:

Each participating flat owner gets a credit deduction on their monthly DISCOM bill. The DISCOM adjusts bills based on the ratio submitted during registration. This means you see your own bill reduced — not the society’s common area bill alone.

What the society needs to do:

Option 2: Individual Terrace/Rooftop Unit Owners

If you own an independent kothi (villa), a floor in a small 2–4 unit building, or have exclusive documented ownership of the rooftop space in a co-owned property, you may be able to install an individual on-grid solar system. Requirements:

This is common for independent houses, row houses, and floors of small buildings. It is uncommon for apartments in large multi-story towers.

Option 3: Small Off-Grid or Balcony Systems (Limited Use)

If a full grid-connected installation is not feasible, a small off-grid system can power a limited set of loads from your balcony or common area:

What a small balcony setup can power:

What it cannot do:

Typical system: 2–4 solar panels (400–800W) + small battery bank + off-grid inverter/charge controller. Cost: ₹30,000–₹80,000 depending on capacity.

This is a useful supplement but not a substitute for a proper grid-connected system.

How to Approach Your Housing Society

If you want to initiate group net metering in your apartment complex, here is a practical sequence:

Step 1: Gauge interest. Talk to your RWA president and a few neighbours. You need majority support for the cost and installation to proceed.

Step 2: Get a survey and quote. A DISCOM-empanelled installer will assess the terrace area, shading, structural load, and available roof area. They will also estimate total system size, cost, and per-unit savings for residents.

Step 3: Present to the general body. The installer’s report gives you a concrete proposal to put to residents — cost per flat, projected savings, payback period. A formal resolution is needed.

Step 4: Register on pmsuryaghar.gov.in. The society registers as the applicant, lists the consumer numbers of participating flats, and submits for DISCOM approval.

Step 5: Installation and commissioning. After DISCOM approval and installation, the bi-directional meter is installed and credits begin flowing.

DISCOM Rules Vary by State

The mechanics of group net metering — how credits are distributed, how many consumer numbers can participate, and what documentation the DISCOM requires — differ by state and DISCOM. Key references:

A good DISCOM-empanelled installer will be familiar with your state’s group net metering process. Verify on pmsuryaghar.gov.in that your installer is empanelled before proceeding.

Checklist Before Pursuing Society Solar

Key Takeaway

Apartment living is not a barrier to solar — it requires a different path than an individual homeowner. Group net metering via the housing society is the most common and financially effective route for apartment buildings in India. Individual flat owners who want to explore this should start by talking to their RWA and getting a professional site assessment.

Use Solar AI Advisor’s calculator to estimate how much a rooftop solar system of a given size could save a household with your monthly bill — this gives you the data to build a strong case to your society.

See the PM Surya Ghar guide for the full subsidy application process that applies to both individual and group installations.

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