In this guide
Housing societies often pay a large electricity bill for common areas: lifts, water pumps, corridor lights, parking and the clubhouse. Solar can cover a good part of that daytime load. This guide is for managing committees in Mumbai, Navi Mumbai and Thane who are considering it.
What a society solar system can run
Most of a society’s electricity use in the daytime is in common areas, which is a good match for solar. Typical loads include:
- Lifts
- Water pumps and booster pumps
- Corridor, staircase and parking lights
- Clubhouse, gym and garden lights
- Security cabin and CCTV systems
The saving appears as a lower common electricity bill, which helps the society’s expenses.
Step-by-step: how a society can go solar
- Understand the bill. Collect 12 months of common-area bills to see units used and the pattern through the year.
- Check the terrace. Measure usable, shade-free space. Tanks, lift rooms and neighbouring towers reduce it. As a rough guide, each kW needs about 100 sq ft.
- Get a site survey. Ask installers to visit and give a written proposal with capacity, brands and what is included.
- Involve the members. Present the proposal at a committee or general body meeting. Keep the explanation simple: what it costs, what it saves, who maintains it.
- Complete the approvals. The society and your electricity distributor each have requirements. Ask the installer who will prepare the paperwork.
- Install and hand over. The installer should explain how to monitor the system and how to keep the panels clean.
Questions every committee should ask
- Is the quote based on a site survey, and what exactly is included?
- What is the expected yearly generation, and how is it measured?
- What warranties apply, and who services the system if something fails?
- How is the structure designed for monsoon winds, and how is it protected from salt air?
- What are the fire-safety and access arrangements for the terrace?
- Has a structural check been done for an older building?
Common mistakes to avoid
- Choosing only on the lowest quote. Compare scope, brands and warranty, not just the total.
- Ignoring shade. A small area of shade can reduce output more than you expect.
- No plan for maintenance. Decide who will clean and inspect the panels, and how often.
- Skipping proper earthing and protection. These are safety features, not extras.
- No written handover. Keep the drawings, warranty documents and contact details with the society office.
Read your common-area bill
When you review the society’s bills, look at:
- Units used each month, and how they change across seasons.
- Daytime versus night-time use. Solar helps most with daytime load.
- Tariff category and fixed charges. These affect how much of the bill solar can reduce.
- Sanctioned or connected load, which helps decide the right system size.
How to pay for it
Societies fund solar in different ways: from the society’s own funds, through a special contribution from members, or with a loan. Some providers also offer models where the society pays for the power the system generates rather than buying the system outright. Ask whether such options are available, and compare the total cost over the years, not only the first payment.
Presenting to members
Members usually want simple answers. Prepare a one-page summary covering:
- What the system will power and the expected yearly saving.
- The cost, how it will be paid and how long it takes to recover it.
- Who maintains the system, and how often it is cleaned and checked.
- Warranty terms and whom to call for service.
- Any effect on terrace access for residents.
After installation
Agree a maintenance plan in writing: a cleaning schedule, inverter checks, a yearly inspection of the structure and earthing, and a named contact for faults. Record the monthly generation so the committee can report the savings to members.
Think about the whole property
Societies that are planning solar often also upgrade security. Read our guide to CCTV for housing societies and see how automatic gates and access control can work together at your entrance.
Talk to us
We work with housing societies, offices and homes across Mumbai, Navi Mumbai and Thane. Book a site visit and we will survey your terrace and prepare a clear proposal for your committee.
Frequently asked questions
Who approves solar on a society terrace?
Usually the managing committee, and in many cases the general body, because the terrace is common property. Check your society bye-laws and ask your installer to present the proposal clearly to members.
What can a society solar system power?
Typically the common-area load: lifts, water pumps, corridor and parking lights and the clubhouse. The savings reduce the society's electricity expense, which can help keep maintenance charges down.
Does a society need a structural check?
It is a good idea, especially for older buildings. Ask a qualified structural engineer to confirm the terrace can take the load of panels and structure.
How can the committee show members the savings?
Record the monthly generation and compare the common-area electricity bill before and after installation. Present the figures at the annual general meeting.
Is solar worth it for a small society?
It depends on the daytime load and the terrace space available. A site survey and a look at twelve months of bills will show whether it makes sense.