Kerala
Kerala simplifies one thing and complicates another. Almost every domestic connection sits with a single distribution company, so there is no licensee confusion. But sloping tiled roofs, palm shade and two monsoons make the physical installation less standard than anywhere else in south India.
Last reviewed
Most state guides spend their length explaining which distribution company handles your application. In Kerala that takes one line, which frees this page up for the questions that actually decide outcomes here: what your roof is made of, what is growing next to it, and which tariff slab you sit in. Begin with the free bill check for the financial half.
Almost all domestic supply in Kerala is with KSEB (Kerala State Electricity Board Ltd), so on pmsuryaghar.gov.in the DISCOM selection is straightforward. From there the sequence is feasibility approval, installation, inspection, a bi-directional net meter, and commissioning, handled through your local KSEB section office — so timelines vary by section rather than by company.
One detail to check on your bill before choosing a capacity: the sanctioned load. If the PV capacity you apply for exceeds it, a load enhancement may be required, bringing charges and processing time that sit outside the installer's quotation. Export is settled under the KSERC tariff order in force at commissioning, and a unit you export is generally worth less to you than one consumed as it is generated — see net metering in India.
On subsidy, treat the central assistance as the plannable figure: commonly ₹30,000 for 1 kW, ₹60,000 for 2 kW, and up to ₹78,000 for eligible systems of 3 kW and above, credited to your bank account after commissioning. Full amount table and KSEB vs ANERT honesty: solar subsidy in Kerala. Kerala has run its own rooftop programmes historically and much of that has converged with the national route, which means older scheme terms still circulate in conversation. Verify any separate state benefit against a current official notice — see state top-up subsidies and the PM Surya Ghar guide.
A large share of Kerala housing has a pitched roof finished in tiles, often over timber framing in older houses. Almost all rooftop solar hardware and pricing assumes a flat concrete terrace, which is why this is where quotations most often go wrong.
Done properly, a sloping roof can be an advantage — a south-facing pitch gives the array a good angle without a tall structure, and it keeps panels clear of standing water. Done carelessly, it produces leaks that appear in the first heavy monsoon. What to insist on:
Concrete terraces, common in newer construction, are the straightforward case — but even there, waterproofing of anchor points matters more in Kerala's rainfall than in a dry state.
Kerala's tree cover is dense and, importantly for a twenty-year asset, it is not static. Coconut palms are tall, frequently planted close to houses, and continue growing well after your system is commissioned. Rubber and other plantation cover does the same in the midland belt.
Shade behaves worse than most people expect, because modules are wired in series: a frond's shadow across part of one panel can pull down the output of an entire string, not just that module. A roof that surveys clear in March can lose an hour of useful generation within a few years.
So ask for the shade path to be assessed on the roof, at more than one time of day, and ask explicitly how likely canopy growth was accounted for in the array layout and string design. Where shading cannot be avoided, module-level electronics or multiple inverter inputs limit how far one shadow propagates — a cost worth weighing rather than dismissing.
Although the DISCOM is the same statewide, the operating environment is not.
The coastal strip, from Kasaragod down through Alappuzha and Thiruvananthapuram, adds salt-laden air. Panels are sealed, but the mounting steel, fasteners, earthing and inverter enclosure corrode faster, so galvanising quality, stainless fixings and a sheltered inverter position are the sensible baseline near the shore.
The midland belt around Thrissur, Kottayam and inland Ernakulam is the most conventional case: mixed independent houses, generally decent roof access, and shading driven by trees and compound walls rather than terrain.
The high ranges — Idukki, Wayanad and the eastern hills — are cooler, which genuinely helps panel efficiency, but terrain shading and plantation cover matter more, and installer travel distance affects how quickly a fault gets attended in year four. Ask who physically attends a service call at your address.
Kerala takes rain from the southwest monsoon and again from the northeast monsoon later in the year, with extended overcast spells around both. Annual generation is therefore lower than in a dry inland state — that is simply the trade for the climate you live in, and modules do keep producing under cloud, just less.
The thing to guard against is a projection built on clear-weather output. Ask any installer for a committed annual generation figure in units and how the monsoon months were treated in the arithmetic. Heavy rain does at least keep the array reasonably clean, so soiling is far less of a chore here than in dry, dusty regions.
For city-level detail on apartment terraces, society timelines and local KSEB sections: Kochi and Thiruvananthapuram.
We advise against buying when your consumption keeps you in the lower tariff slabs and the bill is modest — the units displaced are cheap, and the ₹1,500 a month walkthrough shows how that plays out. Also when a shared terrace has no documented resolution (society NOC), when a tiled roof needs repair first, when palm shade removes much of the day, or when the household load is almost entirely at night, since grid-tied solar cannot serve it without batteries. Most homes that do proceed land at 3 kW, where central assistance stops rising — see 3 kW vs 5 kW. Sealix is not KSEB and not an installer.
KSEB deep guide · Kochi · Thiruvananthapuram · TANGEDCO · Documents required · All areas.
Usually yes, and a south-facing slope can even work in solar's favour, but it is a different job from a flat terrace. Tiles have to be lifted so brackets fix to the rafters or purlins rather than resting on the tiles, and each penetration needs proper flashing. On older timber framing the structure should be assessed for load before equipment is ordered.
Meaningfully. Kerala receives rain from both the southwest monsoon from around June and the northeast monsoon later in the year, so there are extended cloudy periods and annual output is lower than in dry inland states. The system still produces useful energy in overcast conditions, but any savings estimate must be built on an annual figure rather than dry-season output.
They are one of the most common site problems here. Palms are tall, often close to the house, and they keep growing, so a roof that is clear today can be shaded in a few years. Because modules are wired in series, a frond's shadow across one panel can reduce output across a whole string, so the shade path should be assessed on the roof and future growth considered.
It depends on which tariff slab you reach rather than on sunshine. Households in the lower consumption bands pay relatively little per unit, so the units solar displaces are cheap and payback stretches out. Homes consistently consuming enough to sit in the higher slabs have a much stronger case, since solar removes the most expensive units first.
