Clean Energy & Renewable CAPEX
Rooftop Solar & Industrial CAPEX ROI Calculator
Evaluate PM Surya Ghar Central DBT subsidies (up to ₹78,000), Commercial 40% Accelerated Depreciation tax shield (Section 32), payback period, and 25-year net metering electricity savings.
1. Solar Capacity & Installation Type
Recommended: 1 kW per 120–150 units of monthly electricity consumption
Includes solar panels, on-grid inverter, structure, cabling & net-metering setup
2. Grid Tariff, Solar Yield & Maintenance
Your current average electricity billing rate per unit
Average solar yield in India: 4.0 to 4.5 units per kW per day
Typically 1.0% to 1.5% of gross CAPEX for cleaning & servicing
Calculated at standard 90 sq. ft. shadow-free roof per kW.
After ₹78,000.00 PM Surya Ghar Subsidy
₹2,874.38/month bill reduction
Year-1 ROI: 31.2% p.a.
vs ₹7.5 DISCOM grid power
Detailed Financial Breakdown
- Gross Turnkey System Cost
- ₹1,80,000.00
- PM Surya Ghar Central DBT Subsidy
- - ₹78,000.00
- Estimated Daily Generation
- 12.6 Units / day
- Estimated Monthly Generation
- 378 Units / month
- Annual Generation (Year 1)
- 4599 Units / year
- Annual O&M & Maintenance Cost
- ₹2,700.00
- Shadow-Free Rooftop Area Required
- 270 Sq. Ft.
25-Year Lifetime Cumulative Returns
Net profit over 25 years after deducting initial CAPEX, annual O&M, and panel degradation.
Frequently asked questions
What is the PM Surya Ghar: Muft Bijli Yojana subsidy amount?
Under the PM Surya Ghar: Muft Bijli Yojana launched by the Government of India, residential households receive direct benefit transfer (DBT) subsidies of ₹30,000 for 1 kW systems, ₹60,000 for 2 kW systems, and a maximum of ₹78,000 for systems of 3 kW or higher installed with domestic content requirement (DCR) solar modules.
How does 40% Accelerated Depreciation (AD) benefit commercial and industrial solar?
Under Section 32 of the Income Tax Act, commercial and industrial enterprises can claim 40% Accelerated Depreciation on rooftop solar installations in Year 1. For a corporate tax bracket of 25.17%, this produces an immediate tax deduction saving ~₹10,000 per kW, significantly shortening capital payback periods for factories and commercial establishments.
How many units of electricity does a 1 kW solar system generate in India?
In India, 1 kW of rooftop solar generates approximately 4.0 to 4.5 units (kWh) of electricity per day under standard irradiance conditions. Over a full year, 1 kW typically produces 1,400 to 1,550 units (kWh).
How much rooftop shadow-free area is required for solar panels?
On average, each 1 kW of solar capacity requires approximately 80 to 100 square feet of shadow-free rooftop area. A standard 3 kW residential setup requires approximately 250 to 300 square feet of flat or sloping roof.
What is Levelized Cost of Electricity (LCOE)?
LCOE represents the true average cost of generating 1 unit (kWh) of electricity over the entire 25-year lifespan of the solar plant, including upfront capital and annual maintenance. For rooftop solar in India, LCOE is typically ₹2.20 to ₹3.20 per unit—over 60% cheaper than commercial DISCOM grid tariffs (₹8 to ₹12/unit).
How does Net Metering work with state DISCOMs?
With a bidirectional net meter installed by your local power distribution company (DISCOM), solar electricity generated during the day powers your appliances first. Any excess power is automatically exported to the grid. At month-end, the DISCOM bills only for 'Net Units' (Imported − Exported) or banks your surplus credits.