Thinking about switching to solar power at home? Chennai homeowners are going solar in bigger numbers than ever right now, and the process is more straightforward than most people expect. Here’s exactly what it takes, from your first application to the day your system goes live.
Why Now Is a Good Time to Go Solar in Chennai
The average independent house in Chennai burns through a meaningful chunk of its monthly budget on electricity, and that number only moves upward. Since 2024, the central government has been paying homeowners toward the cost of rooftop solar under the PM Surya Ghar Muft Bijli Yojana, and Tamil Nadu’s single-DISCOM setup (TANGEDCO handles the entire state) makes the application process simpler than in states with multiple power boards.
Step-by-Step: How to Go Solar in Chennai
Step 1: Register on the National Portal
Go to pmsuryaghar.gov.in and start your application. You’ll register with your mobile number and your TANGEDCO consumer number, which is the 12-digit number printed on your electricity bill (not your account number — a common mix-up). Select Tamil Nadu as your state and TANGEDCO as your DISCOM, and the portal will auto-fetch your connection details for you to verify. You’ll also need your Aadhaar number, with OTP verification sent to your Aadhaar-linked mobile.
Step 2: Get a Site Feasibility Check
Your roof size, sanctioned load, and shadow-free area get assessed before anything moves forward. This determines how large a system your roof can realistically support.
Step 3: Choose an MNRE-Empanelled Vendor
This part matters more than people realize — only installations done through an MNRE-empanelled vendor qualify for the subsidy. Get quotes from at least three registered installers, and make sure any agreement you sign explicitly mentions the MNRE benchmark cost and subsidy facilitation.
Step 4: TANGEDCO Technical Feasibility Approval
A TANGEDCO engineer reviews your application for grid connectivity approval — this is typically free and takes about 7 to 15 working days in urban areas like Chennai. Don’t let your vendor start installation before this approval comes through.
Step 5: Installation
For a standard 3kW system, installation itself usually takes just 1 to 3 days — the panels, inverter, and wiring all go up in a short window once your vendor is cleared to start.
Step 6: Commissioning and Inspection
Your vendor uploads test reports, photos, and a completion certificate to the portal. TANGEDCO then does a final verification before signing off.
Step 7: Net Meter Installation and Subsidy Payout
Once everything’s approved, TANGEDCO installs your bi-directional net meter, which tracks both the power you draw from the grid and the surplus you feed back into it. Your subsidy — deposited directly to your bank account — typically follows within 8 to 12 weeks of the full process starting, sometimes faster.
What It Actually Costs
The subsidy under PM Surya Ghar works out to ₹30,000 per kW for the first 2kW and ₹18,000 for the third kW, capping out at ₹78,000 total for a 3kW system or larger. That ₹78,000 cap means the percentage of your system cost it covers is highest at exactly 3kW — go bigger and the rupee amount stays the same while the share it covers drops. Tamil Nadu doesn’t currently layer a separate state subsidy on top of this; the central scheme is what you’re claiming, with TANGEDCO handling approvals and net metering on the state side.
A typical 3kW residential system costs roughly ₹2.0–2.4 lakhs before subsidy, bringing your net cost down to somewhere around ₹1.3–1.6 lakhs after the ₹78,000 credit lands.
Understanding Net Metering
Without a net meter, your old-style meter counts the power you export to the grid as consumption — meaning you’d actually get billed for electricity you gave away for free. A bi-directional net meter fixes this: it tracks imports and exports separately, and any surplus you generate gets carried forward as a credit against future bills. For most well-sized systems, summer bills often drop to zero, with credits rolling forward to help cover the lower-generation winter months.
Common Mistakes That Slow People Down
- Starting installation before TANGEDCO’s technical approval comes through — this can disqualify your subsidy application entirely.
- Using your account number instead of your 12-digit consumer number on the registration portal.
- Working with a vendor who isn’t MNRE-empanelled — no matter how good the price looks, you won’t get the subsidy.
- Not following up. If your application sits pending for more than 15 days at any stage, escalating to your local TANGEDCO section office keeps things moving.
Bottom Line
Going solar in Chennai in 2026 isn’t complicated — it’s a defined, seven-step process with a real financial incentive behind it. The parts that trip people up are procedural, not technical: wrong document, wrong vendor, or starting a step out of order. Get those right, and most homeowners are generating their own power within a couple of months of starting.
Ready to go solar? Get a free feasibility assessment for your rooftop and a clear walkthrough of exactly what you’d qualify for.