Rooftop solar in Mumbai: a society decision, done right.
Mumbai's solar opportunity lives on society terraces, not individual roofs. High tariffs make the economics work; committee consensus, structural checks and three possible DISCOMs make the process work only if someone manages it. That's us.
Society-terrace solar, three DISCOMs, and monsoon-aware design.
DISCOMs serving Mumbai.
Your DISCOM approves feasibility, installs the net meter, inspects the plant and triggers the subsidy release — so knowing which one serves your address is the first practical fact of any solar project.
- BEST
- The island city — Colaba to Mahim/Sion
- Adani Electricity Mumbai
- Most of the western and eastern suburbs — Bandra to Dahisar, Kurla to Mankhurd belts
- Tata Power (Mumbai distribution)
- Parts of the suburbs, overlapping Adani's licence area — some consumers have supplier choice. Mumbai's parallel-licence geography is unusual; your bill names your current supplier.
- MSEDCL (Mahavitaran)
- Thane, Navi Mumbai and the wider metropolitan region beyond the city licence areas
Licence-area boundaries in Mumbai's suburbs are genuinely intricate (and some consumers can switch supplier) — your latest electricity bill is the authoritative answer, and the national portal routes by consumer number.
The Mumbai solar picture.
Mumbai pays some of India's highest residential electricity tariffs, which should make it a solar hotspot — but the city's defining constraint is that almost nobody owns a roof alone. The housing stock is vertical: cooperative societies own the terraces, so the realistic unit of solar in Mumbai is the society, not the flat. Common-area systems that power lifts, pumps, lobby and compound lighting are the workhorse model — they cut the CAM bill every member pays, and they fit the Group Housing Society track under PM Surya Ghar.
That makes Mumbai solar as much a governance exercise as an engineering one: a managing-committee resolution, an AGM approval, structural verification of a decades-old terrace, waterproofing warranties that survive panel mounting, and a metering design that matches how the society is billed. The projects that stall are almost never blocked by technology — they die in committee for want of a clean, comparable proposal. Our society tender process exists precisely for that.
Two Mumbai-specific technical realities shape design here. The monsoon: roughly three months of heavily reduced generation, which honest payback models account for (annual generation is still strong — the other nine months are excellent). And salt air plus wind loading near the coast: mounting structures and module choice need marine-grade thinking, which is a vendor-vetting criterion, not an afterthought.
The details specific to Mumbai.
The society is the customer
Committee resolution, AGM consent, and a proposal document members can actually evaluate — we prepare the pack that gets a yes, not just a quote PDF.
Terrace structure and waterproofing
Many Mumbai buildings are decades old. Structural adequacy and waterproofing-warranty preservation are checked before design, and mounting is specified so the terrace membrane survives.
Monsoon-honest payback models
June–September generation drops sharply. Any quote that projects flat monthly generation is overselling; we model Mumbai's real seasonal curve.
Salt, wind and component choice
Coastal corrosion and high wind loading demand better structures and fasteners than inland defaults. It's a line-item we check in every Mumbai bid comparison.
Maharashtra — central CFA only; high tariffs do the heavy lifting.
Maharashtra adds no separate residential capital subsidy: Mumbai households and societies claim the central PM Surya Ghar CFA (including the separate GHS/RWA track for common-area systems) through the national portal. The economics work because Mumbai's tariffs are among India's highest — each generated unit displaces an expensive one.
CFA rates set by MNRE and revised periodically — verify at pmsuryaghar.gov.in. Society (GHS/RWA) per-kW CFA and per-house caps per the current scheme guidelines.
What we do for Mumbai clients.
Mumbai: clear answers.
- Yes. PM Surya Ghar has a dedicated track for Group Housing Societies and RWAs covering common-area systems (lifts, pumps, common lighting), with CFA computed per kW and capped per house. The application runs through the national portal in the society's name, and the saving lands in every member's CAM bill.
- BEST in the island city; Adani Electricity across most suburbs; Tata Power in parts of the suburbs (some consumers have a choice of supplier under Mumbai's parallel licences); MSEDCL in Thane, Navi Mumbai and the wider region. Your bill names your supplier, and the solar application routes accordingly.
- No — it just has to be modelled honestly. Generation drops heavily for roughly three monsoon months and is excellent the rest of the year; annual output in Mumbai still supports strong paybacks at the city's high tariffs. Distrust any proposal showing flat month-by-month generation.
- The committee-to-commissioning arc typically runs a few months: proposal and AGM approval, DISCOM feasibility, installation, then net metering and inspection. The governance steps, not the installation (usually days to weeks), set the timeline — which is why a decision-ready proposal pack matters.