Substantial central financial assistance for rooftop solar
The PM Surya Ghar: Muft Bijli Yojana is a Government of India initiative promoting rooftop solar adoption across residential households — enabling homeowners in Kolkata and across West Bengal to install residential rooftop solar at significantly reduced cost.
Up to 2 kW
per kW
Additional capacity (up to 3 kW)
per additional kW
Total subsidy up to 3 kW
maximum for systems larger than 3 kW (capped)
Subsidy for GHS / RWA
For Group Housing Societies / Resident Welfare Associations — for common facilities including EV charging, up to 500 kW capacity (@3 kW per house), inclusive of individual rooftop plants installed by residents.
Suitable plant capacity
| Avg. monthly units | Suitable capacity |
|---|---|
| 0 – 150 | 1 – 2 kW |
| 150 – 300 | 2 – 3 kW |
| > 300 | Above 3 kW |
For special states, an additional 10% subsidy applies per kW. *As per prevailing Government of India guidelines.
3 kW On-Grid Solar System with ROI
Example pricing for a 3 kW RCC-mounted on-grid system. Final pricing follows a site survey and CESC approval.
System specifications
| System Type | On-Grid (RCC Mounted) |
| Capacity | 3660W – 3KVA / 3900W |
| Modules | 6 × Waaree 610W Mono PERC |
| Inverter | Deye 3 KVA Single Phase |
| Mounting | RCC mounted, full installation |
| Includes | Wiring, breakers, DC array box, AC DB, earth rod, commissioning & testing |
Cost breakdown
| Base system cost | ₹2,18,000 |
| GST @ 8.9% | ₹19,402 |
| System cost with GST | ₹2,37,402 |
| Government subsidy | − ₹78,000 |
| Final net investment | ₹1,59,402 |
Plus CESC service charges & meters ₹12,178, CESC application ₹1,089, 3rd-party inspection ₹2,015.
Return on Investment (25 years)
| Parameter | Value |
|---|---|
| Annual electricity generation | 4,928 kWh/year |
| CESC tariff rate | ₹6.00 / kWh |
| Annual electricity savings | ₹29,568 / year |
| Annual maintenance cost | − ₹2,000 / year |
| Net annual savings | ₹27,568 / year |
| Payback period | ≈ 5.5 years |
| Annual ROI | 18.3% per annum |
| Total savings (25 years) | ₹6,89,200 |
| Net profit after investment (25 years) | ₹5,38,474 |
| Total ROI (25 years) | 357% |