Your electricity bill is the single best guide to whether solar makes sense — and to spotting overcharging. But most people never decode it. Here's what each line means.
Units (kWh) — what you consumed
Units = kilowatt-hours (kWh) of electricity used in the billing cycle. This is the number that drives everything — your cost, and how big a solar system you'd need. Find "units consumed" (present reading − previous reading).
Sanctioned load / connected load
The maximum power (in kW) your connection is approved for. Exceeding it can attract penalties, and it matters for solar sizing and net-metering limits.
Energy charges — and the slab system
Most Indian tariffs are telescopic (slab-based): the per-unit rate rises as you cross usage tiers. So the last units you consume are often the most expensive. This is why solar pays back fastest for high-consumption homes — it shaves off those costly top-slab units first.
The other charges
- Fixed / demand charge — a flat charge based on your sanctioned load, payable regardless of usage.
- Fuel surcharge (FPPCA / FAC) — a variable adjustment for the utility's fuel-cost changes.
- Electricity duty / tax — a government levy on your consumption.
- Meter rent and any arrears.
Add these up and divide by units to find your real effective ₹/unit — often higher than the headline slab rate.
Net-metering credits (if you have solar)
If you have grid-tied solar, look for units exported and a net calculation: units imported minus units exported (see net metering). Your bill should credit the solar you sent back.
Useful reference details
- Consumer number / account ID — needed for the solar-subsidy portal and any complaint.
- Meter number and reading dates.
- Billing period — check it's a full cycle, not an estimated/average bill.
Turn the bill into a solar plan
- Note monthly units and your effective ₹/unit.
- Divide monthly units by 30 → daily units; divide by ~4 → rough kW of solar needed.
- High units + high effective rate = fast payback.
If a bill suddenly spikes, check whether it's an estimated ("average") reading — insist on an actual meter reading before paying.
Reading your bill well is the first step to cutting it. When you're ready to act, rooftop solar basics shows how to size a system, and IndiaCard can help finance it through regulated lenders.