SuryaCalc — Solar Subsidy & ROI Calculator

Your Details

State / UT

System Size (kW)

Monthly Consumption (kWh)

Monthly Electricity Bill (Rs.)

Subsidy Breakdown

Central CFA Net Cost

Central CFA Rs.—

State Subsidy Rs.—

Total Subsidy Rs.—

Gross Cost Rs.—

            Net Cost
            Rs.—
          

— CO₂ offset/year
— over 25 years
approx. — trees planted

Payback Period

—

After all subsidies

Year 1 Savings

—

Select a state to calculate

25-Year Savings

—

Total lifetime gains

Coverage

—

Bill offset

Cost Breakdown

Government subsidy vs. your investment

Donut

Total Subsidy (Central + State)

Net Cost (Your investment)

25-Year Savings Projection

Annual savings grow with 5%/yr tariff escalation

Annual Savings (Rs.)

Payback Point

Energy Coverage

Solar vs. grid usage

Solar

Grid

ROI Milestones

Key financial events

Install Year 0

Break-even —

System Life 25 years

Total ROI —

System Information

Technical specifications & assumptions

System Size —

Year 1 Generation —

Performance Ratio 0.75 (MNRE benchmark)

Panel Degradation 0.6%/year

Tariff Escalation 5%/year assumed

Data Source MNRE PM Surya Ghar (Mar 2024)

⚠ Important: All pre-filled values (tariffs, surplus rates, OA charges) are sourced from official SERC orders and MNRE/PIB notifications. However, net metering tariffs and SERC rates change every financial year. You must verify the current rate from your state's official SERC website before making any financial commitments. Accelerated Depreciation (AD 40%) and GST (5%) are central government rules and do not change state-by-state.

Commercial & Industrial Setup

State / UT

Your Facility's Electricity Usage (optional — auto-sizes system)

Monthly Consumption (kWh)

Your facility's total monthly kWh from the DISCOM bill. Leave blank to enter capacity directly.

Monthly Electricity Bill (Rs.)

Used to cross-check tariff and show bill coverage %. Leave blank if not known.

System & Site

System Capacity (kW) — auto-filled or enter manually

Cost per kW (Rs.) — edit if you have a quote

Market benchmark Apr 2026 ~₹65,000/kW. Includes panels, inverter, mounting, installation.

Peak Sun Hours / Day

Auto-fetched from NASA POWER API on state selection. Edit to use a site-specific value.

Self-Consumption (% of generation)

% of solar generated that is directly used on-site (not fed to grid). Remainder is exported.

Electricity & Tariff

Your HT Commercial Tariff (Rs./kWh)

⚠ Verify from your DISCOM bill — this changes per tariff slab and FY.

Export / Surplus Rate (Rs./kWh)

Pre-filled from SERC order — changes annually. Verify before use.

O&M

Include Annual O&M Cost

O&M Cost (% of CAPEX per year)

Covers panel cleaning, AMC, inverter servicing. Minimum floor: 0.3%. Industry range: 0.5–1.5% per year.

Payback Period

—

All enabled benefits · O&M deducted

Year 1 Total Benefit

—

Energy + Tax + GST + REC

25-Year Lifetime Benefit

—

Total financial benefit

Year 1 Generation

—

At 0.75 PR, no degradation

Year 1 Incentive Breakdown

Energy savings + export credit breakdown

Donut

Energy Savings (self-consumed) —

Export / Metering Credit —

Total CAPEX —

O&M p.a. (deducted) —

Year 1 Combined Benefit —

Self-Consumed (Tier 1)

Export Credit (Tier 2)

25-Year Cash Flow Projection

4% tariff escalation + 0.6%/yr panel degradation

Generation Mix

Self-consumed vs exported

Self-Consumed

Exported

Environmental Impact

CO₂ offset over system life

— CO₂ saved/year
—
≈ —

Year-by-Year Projection (First 10 Years)

▲ Highlighted row = payback year

Yr	Gen (MWh)	Tier 1 (Self)	Tier 2 (Export)	AD + GST	REC	O&M	Year Net	Cumulative
Calculate to see projections

Assumptions & Data Sources

All values traceable to official regulations

Performance Ratio 0.75 (MNRE benchmark India)

Panel Degradation 0.6%/year

Tariff Escalation 4%/year (conservative)

CO₂ Factor 0.706 kg/kWh — India CEA grid emission factor

Solar Data NASA POWER API (power.larc.nasa.gov) — same as residential

System Life 25 years (MNRE standard)