Free tool
How much can a battery save on your electricity bill?
Estimate it in under a minute: pick your state, enter your peak demand and tariff details from your bill, choose a battery size — and see the annual savings from Time-of-Day arbitrage plus demand-charge reduction, with an indicative payback. Every assumption is editable and shown.
Your site
Your battery
100 kWh cabinet → 6.25 MWh container
Share of peak demand the battery clips
Tariff presets are indicative; edit any value to match your bill. Assumes one cycle/day, 330 cycles/yr, 88% round-trip efficiency, 2-hour system, turnkey cost ₹18k/kWh.
Estimated annual savings
- ToD arbitrage (₹2.45/kWh spread)
- Demand charges (−125 kVA)
- Indicative system cost
- Simple payback
- 10-year net benefit
Estimate only — final numbers come from your interval data and current tariff order, free with a feasibility study.
Cumulative savings vs system cost
10-yr savings ₹99.5 L · cost ₹90.0 LMethodology
How the estimate is calculated.
- ToD arbitrage — battery energy × 90% usable depth × 88% round-trip efficiency × (peak rate − off-peak rate) × 330 cycles a year. Peak and off-peak rates derive from your average rate and the ToD percentages on your bill.
- Demand-charge saving — the demand reduction (capped by the battery's power rating, assumed as a 2-hour system) × your ₹/kVA demand charge × 12 months.
- Payback — an indicative turnkey system cost of ₹18,000/kWh (₹1.5–1.8 crore per MWh) divided by total annual savings. Deliberately conservative: backup value, solar pairing and grid services are excluded.
Go deeper
The concepts behind the numbers.
About this calculator
How accurate is this calculator?
It is a first-order estimate built on indicative state tariffs and standard assumptions (one cycle per day, 88% round-trip efficiency, 2-hour system). Your real number depends on your interval data and current tariff order — which is exactly what our free feasibility study models before you commit to anything.
Where do the tariff values come from?
State presets are indicative values reflecting typical C&I HT tariffs and ToD structures; every field is editable so you can enter the exact rates from your own electricity bill for a tighter estimate.
What battery size should I enter?
If you are unsure, start with a battery sized near your evening-peak energy use — for many C&I sites that is roughly 1–2 hours of average demand. The feasibility study finds the size with the best payback rather than the biggest battery.
Does the estimate include backup value or solar?
No — deliberately. It counts only the two hardest-cash streams: Time-of-Day arbitrage and demand-charge reduction. Backup value, solar self-consumption and grid services stack on top, so the real business case is usually stronger than this estimate.
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Send us a bill and interval data — we turn this estimate into a bankable feasibility study, free.