Electricity Bill vs Solar Payback
Side-by-Side Comparison
Enter your DISCOM, monthly consumption, and roof space. Instantly see your annual grid cost vs 25-year solar ROI — the numbers that convert fence-sitters to solar adopters.
~100 sq ft per 1 kW solar panel
What Drives Your Solar ROI — 4 Key Variables
The calculator uses these factors to compute your 25-year net gain. Tweak your DISCOM and units to see how each one shifts the outcome.
Solar Irradiance
Hyderabad & Rajasthan get 5.8–6.5 peak sun hours. Mumbai & Chennai: 5.0–5.5. Bengaluru: 5.4. Higher irradiance = faster payback.
PM Surya Ghar Subsidy
₹30,000 for 1 kW, ₹60,000 for 2 kW, up to ₹78,000 for 3 kW. Directly reduces upfront cost.
DISCOM Net Metering Rate
KSEB & BESCOM offer ₹3.56/unit buyback — best in India. TSSPDCL offers ₹2.80. Higher buyback = more savings from export.
Tariff Escalation
Grid tariffs rise ~5% per year historically. Solar locks in zero fuel cost for 25 years — the hedge grows in value over time.
State-wise Solar Advantage Matrix
| DISCOM | Top Slab | Net Metering Rate | Sun Hours/Day | Solar ROI Score |
|---|---|---|---|---|
| TSSPDCL | ₹9.50 | ₹2.80 | 5.8 | 9.2/10 |
| MSEDCL | ₹9.56 | ₹2.90 | 5.3 | 9.0/10 |
| BESCOM | ₹8.16 | ₹3.56 | 5.4 | 9.4/10 |
| KSEB | ₹8.00 | ₹3.56 | 4.8 | 8.5/10 |
| PSPCL | ₹8.15 | ₹3.00 | 5.2 | 8.3/10 |
| TANGEDCO | ₹6.40 | ₹3.56 | 5.5 | 8.8/10 |
