Open an electricity bill and the number at the bottom rarely matches the simple sum you had in your head. That is not a mistake, a bill is built from several separate charges, each covering a different part of getting power to your home. Once you can see what each line is for, the bill stops being a mystery and becomes something you can read at a glance. Here is the whole thing, in plain language.
We will use a home connection from MSEDCL, Maharashtra State Electricity Distribution Co. Ltd., the company most people in Maharashtra know as Mahavitaran. A home falls in the residential category (often printed as LT I on the bill). The rates themselves are not set by MSEDCL on a whim: they are approved by the state regulator, the Maharashtra Electricity Regulatory Commission (MERC), and revised from time to time, so the exact figures on your bill are the ones to trust.
Start with the one number that drives everything: units
A unit is the amount of electricity you have used. One unit is one kilowatt-hour (kWh), what a 1000-watt appliance uses if it runs for one hour. In everyday terms:
- A 1.5-ton air conditioner draws roughly 1.5 kilowatts, so it uses about 1.5 units for every hour it runs.
- A ceiling fan (around 70 watts) runs for about 14 hours on a single unit.
- A 9-watt LED bulb burns for over 100 hours on one unit.
Your meter simply counts these units as they add up. The number of units on the bill is this month's meter reading minus last month's reading. Everything else on the bill is worked out from that one figure.
Why it isn't just units × one rate
You might expect the energy charge to be units multiplied by a single price. It is not, MSEDCL uses a slab system, where electricity is priced in bands.
Your first units are charged at the lowest rate, and only the units above each step cost more. The bands (set by MERC) run roughly like this, the first 100 units, then the next block, then the next, with the price per unit rising as you climb:
| Units in the month | What it means |
|---|---|
| First 100 | Charged at the lowest rate |
| 101 – 300 | A higher rate, only on these units |
| 301 – 500 | Higher again, only on these units |
| Above 500 | The top rates, only on the units up here |
The key idea: reaching a higher slab does not make your whole bill jump to that rate. Only the extra units sit in the higher band. This is why a household that keeps its usage modest pays a noticeably gentler average rate, most of its units stay in the cheaper bands.
The charges that make up your bill
With units understood, here is every line you are likely to see, and what each one pays for.
Energy charge
The biggest piece, and the one worked out from the slabs above, the cost of the actual electricity you consumed. This is the only line that follows the slab calculation.
Wheeling charge
A small amount per unit for delivering that electricity to you, carrying it across the poles, wires, transformers and substations between the grid and your meter. Think of it as the transport cost, separate from the electricity itself.
Fixed charge
A flat monthly amount you pay regardless of how much you use. It covers the cost of keeping your connection ready, the line, the meter, the standing infrastructure. It is tied to your sanctioned load: the capacity, in kilowatts, that your connection is approved for (the ceiling on how much you can draw at once). A larger sanctioned load means a larger fixed charge. This line is why even a locked-up, barely-used home still receives a modest bill.
Fuel Adjustment Charge (FAC)
A small per-unit amount that moves up and down with the cost of the fuel, mainly coal and gas, used to generate the power. Because fuel prices change, this charge is revised periodically, which is why an identical month of usage can cost slightly different amounts at different times of year.
Electricity Duty
A tax collected for the state government, charged as a percentage of the charges above. It is not MSEDCL's own income, the company collects it on the government's behalf and passes it on, the way a shop collects GST.
The small lines: tax on sale, adjustments
A few minor entries round things off, a small tax on sale of electricity, and any adjustments or arrears carried over from a previous month. Individually they are tiny; they are listed for completeness.
Putting it together: a sample bill
Here is the whole calculation for a home that used 250 units in a month, so you can see how the pieces stack into a total.
The figures below are rounded and illustrative, used to show the method, not as a rate card. The exact rates for your category are printed on your own bill and set by the current MERC tariff order.
| Line | How it's worked out | Amount (₹) |
|---|---|---|
| Energy charge | 100 units at the low rate + 150 units at the next rate | 1,500 |
| Wheeling charge | 250 units × a small per-unit rate | 350 |
| Fixed charge | Flat, set by sanctioned load | 110 |
| Fuel Adjustment Charge | 250 units × the current FAC | 100 |
| Electricity Duty | A percentage of the charges above | 330 |
| Total | 2,390 |
Notice how the energy charge, the electricity itself, is a little over half the bill. The rest is delivery, the standing connection, fuel movement and government duty. That mix is normal, and it is the same shape on almost every home bill.
Finding these on your own bill
With the parts named, the printed bill becomes easy to navigate. The figures you will want to find are:
- Consumer number and billing unit, your account's identity, useful for any query or online payment.
- Sanctioned load (in kW), the capacity behind your fixed charge.
- Units consumed, with this month's and last month's meter readings.
- The charge break-up box, every line above, itemised.
- The due date and any prompt-payment discount for paying early.
A few things worth knowing
- Your first units are always the cheapest. Because of the slabs, a reduction on a high bill saves you money at the top rate, so the easiest savings come off the heaviest months.
- Sanctioned load is worth matching to your real need. Set far above what you draw, it adds to the fixed charge; set too low, appliances may trip. The right figure sits comfortably above your genuine peak.
- Paying early earns a discount. Many bills carry a small prompt-payment discount for settling before the due date, a genuine, effortless saving.
- Single-phase or three-phase changes the type of connection, not the way the bill is calculated. The same lines apply to both.
- Reading your own meter once a month tells you your usage trend before the bill arrives, and makes a wrong reading easy to spot.