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 cuts your bill sharply 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 big-saving promises hold up versus where they're 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 How Low Your Bill Can Go

Can solar lower your bill substantially? 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 offset most of your import over the billing cycle; fixed charges still apply. 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 deliver those savings 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