Solar vs Electricity Bill — How Much Will You Actually Save?

Updated March 2026 | Sri Ishaan Solar

The #1 question we get: "How much will my bill reduce?" It's the right question — but the honest answer has a nuance that most sales pitches skip, and understanding it is the difference between a system that nearly zeroes your bill and one that leaves you disappointed. Below are real before/after numbers from our Hyderabad installations, followed by why those numbers work the way they do — and where the near-zero promise is genuine versus where it's oversold.

Real Before/After Examples

Why Solar Cuts the Expensive Units First

Here's the mechanism behind those before/after numbers, because it explains why solar saves more than people expect. TGSPDCL bills you in slabs: the first 100 units are cheap (around ₹1.45/unit), but consumption above 200-300 units is charged at ₹8.50-10.30/unit. A typical Hyderabad family with a couple of ACs sits in those top, expensive slabs. When solar generation offsets your consumption, it knocks out those highest-priced units first — you're effectively erasing ₹9-10 units and being left with only the cheap ₹1.45 base slab. That's why a family whose bill was ₹5,000 doesn't drop to ₹2,500 with "half" their power from solar; they drop to a few hundred rupees, because the units solar replaced were the dear ones, not the cheap ones.

The Honest Answer on "Near-Zero" Bills

Can solar take your bill to almost nothing? Genuinely yes — but only if the system is sized to your actual consumption and you're on net metering. Net metering is what makes it real: your daytime surplus is banked as export credit and drawn back against your night-time import, so a correctly sized system can net out to near-zero over the billing cycle, leaving mostly the small fixed charges. Where the promise gets oversold is when an installer sizes a system to your roof rather than your bill, or ignores shading. An undersized or shaded system won't reach near-zero no matter what the brochure said. This is exactly why we run a proper site survey with shading analysis and give a realistic savings projection rather than an inflated one — a bill that lands at ₹300 as promised beats a bill that was sold as ₹0 and came in at ₹1,200.

25-Year Savings Projection

• Rs 2,000 bill → Rs 5.5 lakh saved over 25 years
• Rs 3,500 bill → Rs 9.9 lakh saved
• Rs 5,000 bill → Rs 14.2 lakh saved
• Rs 8,000 bill → Rs 22.5 lakh saved

And electricity rates increase 5-7% every year. Solar locks in your rate at Rs 0.

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📊 Hyderabad Electricity Tariff — 2026 TGSPDCL Slabs

Solar savings ని properly calculate చేయాలంటే, మీరు ఏ slab లో ఉన్నారో అర్థం చేసుకోవడం అవసరం. TGSPDCL domestic tariff 2026:

Key insight: Most Hyderabad families (3–4 BHK, 1–2 ACs) consume 250–600 units/month — slabs 3, 4, 5. Solar eliminates these high-rate units first. A 5 kW system generating 600 units/month effectively reduces your bill from slab 4 (₹9.50) to slab 1 (₹1.45) — ₹8.05/unit savings on every unit replaced.

📈 25-Year Bill vs Solar Savings Projection

Electricity tariff increases 5–7% annually (APERC/TSERC historical trend). Here's how the math plays out for a 5 kW solar customer:

5 kW system cost after PMSG subsidy: ₹2.72L. Break-even: Year 5. 25-year net profit: ₹29L+.

❓ Savings FAQ

Last updated: May 2026