These Bihar rates are our estimates. We could not check every figure against the official tariff order, so treat the bill as a close guide, not an exact amount. Copy the Fuel surcharge (FPPAS) and duty from your bill for a closer answer.
Rooftop solar price in Bihar after subsidy
| Size | Price | PM Surya Ghar | Bihar state top-up | You pay |
|---|---|---|---|---|
| 1 kW | ₹60,000 to ₹80,000 | ₹30,000 | ₹10,000 | ₹20,000 to ₹40,000 |
| 2 kW | ₹1.2 lakh to ₹1.5 lakh | ₹60,000 | ₹20,000 | ₹40,000 to ₹70,000 |
| 3 kW | ₹1.65 lakh to ₹2.1 lakh | ₹78,000 | ₹20,000 | ₹67,000 to ₹1.12 lakh |
| 5 kW | ₹2.6 lakh to ₹3.3 lakh | ₹78,000 | ₹20,000 | ₹1.62 lakh to ₹2.32 lakh |
Approved in August 2026 for one year, first come first served for up to 5 lakh homes: Rs 10,000 per kW, up to Rs 20,000, on top of PM Surya Ghar.
125 units free every month for all homes since 1 August 2025.
Solar output and savings by city in Bihar
For a home using 300 units a month with a system sized to its use.
| City | 3 kW makes a day | Saving a month | Payback (years) |
|---|---|---|---|
| Patna | 11.1 | ₹1,047 | 3.8 |
| Gaya | 11.3 | ₹1,053 | 3.7 |
| Bhagalpur | 10.9 | ₹1,044 | 3.8 |
| Arrah | 11.2 | ₹1,049 | 3.8 |
| Muzaffarpur | 10.9 | ₹1,044 | 3.8 |
| Darbhanga | 10.8 | ₹1,042 | 3.8 |
| Purnia | 10.7 | ₹1,039 | 3.8 |
| Chhapra | 11.1 | ₹1,047 | 3.8 |
| Begusarai | 10.9 | ₹1,044 | 3.8 |
| Bihar Sharif | 11.2 | ₹1,049 | 3.8 |
Our estimate from public tariff data and typical sunshine for each city. Real output varies by about 10% either way.
How to apply
- Register on the PM Surya Ghar portal with your electricity consumer number.
- Choose a registered vendor, get 2–3 quotes with DCR (made-in-India) panels, and install.
- After the net meter is fitted and the system is inspected, the subsidy is paid into your bank account.
Common questions
How much does rooftop solar cost in Bihar after subsidy?
A 3 kW system typically costs ₹1.65 lakh to ₹2.1 lakh. PM Surya Ghar takes off ₹78,000 and the Bihar top-up another ₹20,000.
How much electricity does 1 kW solar make in Bihar?
About 3.7 units a day on average (1,350 a year) in Patna, less in the monsoon and more in March to May.
How long does solar take to pay back in Bihar?
For a home in Patna using 300 units a month, a 2.5 kW system costs about ₹48,500 after subsidy, saves about ₹1,047 a month and pays back in about 3.8 years (our estimate).
What happens to extra solar units?
With net metering, units you do not use go to the grid and are set off against units you take. Surplus left over is paid at a low rate, about ₹2.71 a unit in our estimate, so size the system to your own use.