Tamil Nadu’s New ₹1 Lakh Rooftop Solar Subsidy: What We Know So Far

Since the Tamil Nadu budget was presented on 5 August, one question has come up more than any other: "Is it true I can now get ₹1 lakh off rooftop solar?" The short answer is yes, it's heading that way — but not every detail has been published yet. This post sets out, plainly, what has been announced, what is still unclear, and what you can sensibly do in the meantime. We'll update it as soon as the state's detailed guidelines are notified.

The short version

• The central government's PM Surya Ghar Muft Bijli Yojana already offers up to ₹78,000 for a home rooftop system of 3 kW or more.
• The Tamil Nadu budget announced an additional state subsidy of up to ₹22,000 that stacks on top of the central amount.
• Together, that takes the combined support to up to ₹1,00,000 for eligible households.
• The state's detailed guidelines — exact eligibility, how to apply, and from when it applies — have not been released yet.

How the central PM Surya Ghar subsidy works

The central scheme is well established, so this part is clear. For residential rooftop solar, the subsidy is calculated on system size:

• ₹30,000 per kW for the first 2 kW
• ₹18,000 for the third kW
• Capped at ₹78,000 in total for systems of 3 kW and above

A few conditions matter in practice. The scheme is for residential connections. Applications go through the national PM Surya Ghar portal, the system must be installed by a vendor registered for your area, and it must use domestically manufactured (DCR) solar panels. The subsidy is credited to your bank account after the installation is inspected and the net meter is commissioned — not at the time of purchase.

Apartments have a route too. Group housing societies and residents' associations can claim central support for solar on common facilities such as corridor lighting, lifts and water pumps. If you're on an RWA committee, it's worth checking the current rates for this on the portal.

What the Tamil Nadu top-up adds

The state announcement adds up to ₹22,000 on top of the central ₹78,000 for eligible homes, bringing the total to ₹1 lakh for a 3 kW system. For a typical Chennai household, that is a meaningful reduction — it brings a quality rooftop system within reach of many more families.

What we don't know yet

This is the part to be careful about. Until the detailed guidelines are notified, nobody can say for certain:

• Exactly who qualifies for the state share, and whether there are income, consumption or connection-type conditions.
• Whether it will be claimed through the same national portal or a separate state process.
• Whether it will apply to systems installed before the guidelines are published.
• How long disbursement will take once claimed.

We'd be cautious about anyone who promises you the full ₹1 lakh today. The central ₹78,000 is established; the state top-up is announced but not yet operational.

What does a 3 kW system actually cost in Chennai?

As an indicative market range, a good-quality on-grid 3 kW residential system with DCR panels, a reputable inverter, a galvanised mounting structure, earthing and net-meter support typically costs around ₹1.8–2.2 lakh before subsidy. Your exact figure depends on roof type, cable runs, structure height and component brands.

Here is how the maths could look on an illustrative ₹2,00,000 system:

• System cost: ₹2,00,000
• Less central subsidy: − ₹78,000 → ₹1,22,000
• Less state top-up, if it applies in full: − ₹22,000 → ₹1,00,000

Remember that the subsidy reaches you after commissioning, so plan to pay the full system cost upfront.

Is 3 kW the right size for your home?

A useful rule of thumb in Chennai's climate is that each kilowatt of well-installed panels generates roughly 4 units a day on average across the year. That means a 3 kW system produces in the region of 650–750 units over a two-month billing cycle. Pull out your last few bi-monthly electricity bills: if your consumption is in that range or higher, 3 kW is a sensible starting point. Homes running several air conditioners through the summer often benefit from going larger — the subsidy is capped at 3 kW, but the savings keep growing with every extra kilowatt you install.

Should you wait for the guidelines?

It depends on what matters most to you.

• If you want the maximum subsidy, the safest approach is to prepare now and install once the state rules are published, so you know for certain that your installation qualifies.
• If you're mainly focused on cutting your bill and the central subsidy alone makes the numbers work for you, there's no need to lose months of savings waiting.

Either way, the preparation is the same — and doing it now means you won't be stuck in a queue when demand jumps after the guidelines come out.

What you can do right now

• Check your roof — available shade-free area, condition, and whether it needs waterproofing work before panels go on top of it for 25 years.
• Check your sanctioned load on your electricity bill, since your system size is linked to it.
• Keep your documents ready — your electricity consumer number, proof of ownership and a bank account for the subsidy credit.
• Get a site assessment so you have an accurate system size and quote ready to go.

What to look for in an installer

A subsidy is only worth having if the system lasts. Chennai's coastal conditions — strong winds during cyclones, salty air and heavy monsoon rain — are tough on rooftop installations. Before you sign, check that your installer is registered for the scheme, uses DCR panels with a clear performance warranty, installs a properly engineered galvanised structure rated for wind load, includes correct earthing and lightning protection, handles the net-metering paperwork, and offers periodic cleaning and maintenance. Salt and dust quietly reduce output if panels are never cleaned.

If you're still deciding between system types, our guide to on-grid, off-grid and hybrid inverters explains which suits your home, and our rooftop solar cost and ROI guide covers payback in more detail.

Key takeaways

The central ₹78,000 is available today, and Tamil Nadu has announced up to ₹22,000 more — potentially ₹1 lakh in total for a 3 kW home system. Until the state guidelines are published, prepare rather than rush: check your roof, gather your documents and get an accurate quote so you're ready to move. Explore our solar energy solutions, or request a free solar assessment and we'll size a system for your home and explain how the subsidy works.