Kolkata · West Bengal
Kolkata gets fewer clear days than western India, which sounds like bad news for solar. It also has some of the country's more expensive domestic units at higher slabs, and that is what actually drives payback. The roof, not the sunshine, is usually the real constraint.
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Fast triage: CESC or WBSEDCL is decided by the name on your bill, not your pin code. Both can now claim PM Surya Ghar (WBSEDCL only since 2026), and West Bengal has announced a top-up that takes a 3 kW home to about ₹93,000 in total. See the side-by-side or check your bill.
Rooftop solar advice tends to rank cities by sunlight, which puts Kolkata low on the list and stops there. That misses how payback actually works. A rooftop plant saves you money at the price of the units it displaces, so an expensive unit in a humid city can be worth more than a cheap unit in a sunny one. The honest local questions here are about tariffs, roofs and shading — not irradiance. Start with the free bill check.
Two utilities operate across the Kolkata area. CESC is a private licensee supplying central Kolkata and much of the core city. WBSEDCL is the state distribution company supplying large parts of the wider urban area and the rest of West Bengal. Locations such as Salt Lake, Rajarhat and the outer suburbs can fall under either depending on the precise address.
The distinction is practical. Application handling, how feasibility is assessed, the net-metering procedure and the empanelled vendor list all differ between a private licensee and the state company, as do realistic timelines. Read the utility name on your own bill rather than relying on what a neighbour in a different locality experienced. If you are buying property or have recently moved, confirm again — this is not something to assume from the postal address.
| CESC (private licensee) | WBSEDCL (state company) | |
|---|---|---|
| PM Surya Ghar central subsidy | Available since 2024 | Opened to WBSEDCL homes in 2026; state launch 22 July 2026 |
| Where you register | pmsuryaghar.gov.in, select CESC | pmsuryaghar.gov.in, select WBSEDCL |
| Net-metering step | Apply to CESC online (cesc.co.in) or at CESC’s Solar Cell, North Regional Office, 226 A & B A.P.C. Road; application fee billed; letter of approval, then 180 days to install | WBSEDCL gives feasibility, inspection and the net meter |
| Older state route | — | The state’s Aloshree scheme stopped taking new applications after the 2026 change; pending Aloshree files are being handled separately |
Domestic tariffs here are structured in slabs that rise steeply with consumption, and the upper slabs are among the more expensive in India. Rooftop solar always displaces your most expensive units first, because it reduces consumption from the top of the slab structure downward.
That produces a result many households find counterintuitive: a Kolkata home with a large bill can pay back a system faster than a similar home in a sunnier state where power is cheap, even though the Kolkata plant generates fewer units per year. Generation is only half of the calculation; the price of each avoided unit is the other half.
The flip side is equally important. If your consumption stays in the lower slabs and your bill is modest, the units you avoid are cheap ones, and a rooftop plant will struggle to justify itself regardless of how the pitch is framed. Take twelve months of bills and look at which slab you actually reach.
In practice, most Kolkata rooftop solar conversations end on roof questions rather than money questions.
Kolkata has a long, heavy monsoon and stays humid for much of the year, with hazy conditions that diffuse sunlight even on days without rain. Expect meaningfully lower generation than a dry inland city, and treat any estimate that ignores this as unreliable. Ask the installer for a committed annual generation figure in units and how they arrived at it.
Humidity also has a hardware dimension. Damp conditions accelerate corrosion of mounting steel and fasteners, so galvanised structure and good quality fixings matter more here than in a dry climate. Inverters should be sited where they stay dry and ventilated. Ask specifically how enclosures and cable entries are sealed, and how the roof penetrations are waterproofed — a leak during a Kolkata monsoon is not a minor inconvenience.
Residential applications go through pmsuryaghar.gov.in, then proceed through feasibility, installation, inspection, a bi-directional net meter, and commissioning. Central assistance commonly runs ₹30,000 for 1 kW, ₹60,000 for 2 kW, and up to ₹78,000 for eligible systems of 3 kW and above, transferred to your bank account after commissioning rather than deducted from the invoice. Sealix adds nothing of its own.
West Bengal top-up (announced 22 July 2026): the state adds ₹5,000 (1 kW), ₹10,000 (2 kW) or ₹15,000 (3 kW) on top of central assistance — about ₹35,000 / ₹70,000 / ₹93,000 in total — plus a further ₹15,000 for SC/ST households. Confirm on your application that the top-up applies to your licensee before you count it in payback.
Net metering is available again for all domestic sizes: between January 2022 and July 2025 WBERC limited traditional net metering to systems up to 5 kW, and that cap no longer applies.
Export is settled under the tariff order in force at commissioning, and an exported unit is generally worth less to you than one you consume as it is generated — see net metering in India. Process detail sits in the PM Surya Ghar guide, and financing in rooftop solar loans.
Given limited terrace space and a steep slab structure, sizing in Kolkata should follow your consumption rather than your roof area. Many households land at 3 kW where space allows, because central assistance stops rising above that point — see 3 kW vs 5 kW. Confirm the sanctioned load on your bill as well, since exceeding it can trigger load-enhancement charges outside the quotation.
We advise against proceeding when consumption sits in the lower slabs with a bill under roughly ₹1,000 a month, when roof consent is unresolved, when shading removes a large part of the day, or when the building's structural condition needs attention first. Tenants and commercial connections fall outside this guidance. Sealix is not CESC, not WBSEDCL and not an installer — we assess the bill and introduce a certified partner only when it genuinely adds up.
WBSEDCL rooftop solar guide · West Bengal state hub · Society NOC · Apartment rooftop solar · Net metering · Costs & savings · All areas.
Central Kolkata and much of the core city area is supplied by CESC, a private licensee, while WBSEDCL supplies large parts of the surrounding urban area and the rest of West Bengal. Salt Lake, Rajarhat and outer suburbs may fall under either depending on the exact location. Check the name on your bill, because the application route and net-meter process differ.
Both now use pmsuryaghar.gov.in for central subsidy, but the history and the second step differ. CESC homes have had PM Surya Ghar since 2024 and file the net-metering application with CESC (online at cesc.co.in or at CESC's Solar Cell), receive a letter of approval and have 180 days to install. WBSEDCL homes were only brought into PM Surya Ghar in 2026, after the state's earlier Aloshree scheme stopped taking new applications; WBSEDCL gives feasibility and the net meter. West Bengal announced a state top-up of ₹5,000 to ₹15,000 in July 2026 — confirm it applies to your licensee before counting it.
For households that reach the higher domestic tariff slabs, often yes. Payback depends on the price of the units you avoid, and Kolkata's upper domestic slabs are among the more expensive in the country. A home with a substantial bill can therefore see a shorter payback than an equivalent home in a sunnier state with cheaper power.
Yes, though less than in western or southern India. A prolonged monsoon and humid, hazy conditions reduce annual generation compared with a dry inland city. The correct response is not to avoid solar but to use a realistic annual generation figure, because the high tariff often more than compensates for the lower output.
Only with the documented consent of the owners' association, since the roof is common property. In older buildings with unclear ownership records or multiple co-owners this is often the hardest part of the project, and it should be resolved before any equipment is ordered or advance paid.
