Electricity bill guide
kVAh billing: where power factor is priced into every unit.
More industrial consumers are now billed on kVAh instead of kWh. It looks like a small change on the bill, but it turns power factor into a cost on every single unit. Here is how it works and how plants keep the gap small.
kWh and kVAh: two different units
kWh (kilowatt-hours) is active energy — the energy that actually turns motors, heats furnaces and runs lights. kVAh (kilovolt-ampere-hours) is apparent energy — what the supply actually delivers, including the reactive energy that magnetises motors and transformers and then flows back without doing work.
On a kWh tariff you pay for the useful part. On a kVAh tariff you pay for the whole delivery.
The formula that sets your bill
At a power factor of 1.00, kVAh and kWh are the same. At 0.90, every 100 kWh is billed as about 111 kVAh. At 0.80, it is billed as 125.
The meter adds up kVAh continuously, so the month’s figure reflects your power factor hour by hour — not one average reading. Hours at poor power factor add extra units; hours near unity add almost none.
Who is billed this way
A growing number of Indian states bill some or all HT and HV industrial and commercial consumers on kVAh. Uttar Pradesh, for example, bills its HV categories in kVAh, with time-of-day rates applied to kVAh as well. Your bill shows which applies to you: if the energy charge is calculated on kVAh units, you are on kVAh billing.
What a few points of power factor cost
Take an illustrative plant using 1,00,000 kWh a month, at an energy rate of ₹7.10 per kVAh:
| Same 1,00,000 kWh | PF 0.90 | PF 0.98 |
|---|---|---|
| kVAh billed | 1,11,111 | 1,02,041 |
| Energy charge | ₹7,88,889 | ₹7,24,490 |
| Extra cost a month | ₹64,399 | — |
| Extra cost a year | about ₹7.7 lakh | — |
Illustrative figures, energy charge only — before fuel surcharge, time-of-day rates, duty and fixed charges. Rates and rules differ by state, DISCOM and consumer category.
Nothing about production changed. The plant made the same product with the same machines; the only difference is power factor.
Three things that surprise plants on kVAh
- Leading power factor can count too. In many kVAh tariffs, both lagging and leading reactive energy add to kVAh. Capacitors left on at light load push PF leading — and those hours are billed as well.
- Time-of-day rates multiply it. Where peak-hour rates apply to kVAh, poor power factor in peak hours costs the most of all.
- Demand moves with it. Where Maximum Demand is billed in kVA, the same low PF that adds kVAh also raises Maximum Demand.
How to bring kVAh down
- Hold power factor close to 1.00 at every hour, not just on the monthly average. See our power factor guide for causes and fixes.
- Watch light-load hours. Nights, holidays and shift changes are where correction most often overshoots into leading PF.
- Cut idle load. Machines left running between jobs add kWh and kVAh with no output.
- Shift flexible loads off peak where time-of-day rates apply.
How KONDUKTOR® EMS helps
KONDUKTOR® EMS reads the multifunction meters already on your panels and records kWh and kVAh for every meter, alongside live power factor.
- A running kVAh bill estimate — with the time-of-day split, fixed charge, fuel surcharge and duty — shows where the month is heading before the bill arrives.
- kWh and kVAh side by side, per meter and per hour, show exactly which panel and which hours add the extra units.
- Low-PF alerts flag a slipping panel the same day, not at month end.
Common questions
Is kVAh billing bad for industrial consumers?+
Not if power factor is managed. At unity power factor, kVAh equals kWh and nothing extra is billed. It rewards plants that keep PF close to 1.00 every hour and costs plants that do not.
Is there a separate power factor penalty or rebate under kVAh billing?+
Usually not, because power factor is already built into the billed units. Check your tariff order, as rules differ by state and category.
Where do I see kVAh on my meter?+
The DISCOM meter displays cumulative kVAh alongside kWh, and the bill shows both readings with the units consumed. Most multifunction meters on internal panels record kVAh too, which lets you see which panel is adding the extra units.
Know your kVAh bill before it arrives.
Book a live demo and see per-meter kVAh, power factor and a running bill estimate on meters like yours.