Part of the complete guide: Solar subsidy (complete guide)
A 3 kW rooftop system in Kanyakumari costs about ₹1.7–2.1 lakh before subsidy. Central subsidy is up to ₹78,000, plus an announced ₹22,000 Tamil Nadu top-up, so most homes pay about ₹0.7–1.1 lakh and recover it in 3.5 to 5 years.
Cost, subsidy and savings by system size
| System | Indicative cost | Subsidy | Yearly generation | Yearly bill saving |
|---|---|---|---|---|
| 2 kW | ₹1.2–1.4 lakh | ₹60,000 | 2,920 units | ₹18,980 |
| 3 kW | ₹1.7–2.1 lakh | ₹100,000 | 4,380 units | ₹28,470 |
| 5 kW | ₹2.8–3.4 lakh | ₹100,000 | 7,300 units | ₹47,450 |
| 10 kW | ₹5.3–6.2 lakh | ₹100,000 | 14,600 units | ₹94,900 |
Indicative: complete DCR on-grid system, ₹6.5 per unit. Actual prices depend on brand, roof and structure.
Why Kanyakumari is different
Kanyakumari has some of the best sunshine in South India, a large number of churches, mission schools, colleges and hospitals, and farms around Marthandam and Thovalai. Strong winds and coastal salt make installation quality matter more than anywhere else we cover.
Subsidy in Kanyakumari
Homes can claim the central PM Surya Ghar subsidy of up to ₹78,000, and Tamil Nadu has announced an additional ₹22,000 state top-up for 3 kW homes, about ₹1 lakh in total. Reports say TNPDCL opened applications from 21 September 2026; verify on the portal before paying any advance.
Metering and billing in Kanyakumari
TNPDCL and TNERC rules apply in Kanyakumari, not KSEB. Domestic consumers get the first 100 units free in each bimonthly bill under current policy, so solar saves money only on units beyond that. Confirm the latest TNERC tariff order.
Towns covered
We cover Nagercoil, Marthandam, Thuckalay, Colachel, Kuzhithurai, Padmanabhapuram and Aralvaimozhi and many more. See the Kanyakumari solar guide for every town.
More for Kanyakumari
- Solar cost and subsidy in Kanyakumari
- Business and institutional solar in Kanyakumari
- How to choose a solar installer in Kanyakumari
Try the solar calculator with your bill, check the Solar Rules Checker, or read the latest Solar Daily Brief for rule changes. Common terms are explained in the glossary.
