Power Factor, kVAh Billing and PF Penalty Explained

6 min read · Updated 21 July 2026

Power factor (PF) is the fraction of the electricity you draw that does useful work: PF = kW ÷ kVA, ranging from 0 to 1. Motors, welders and old ballasts draw "reactive" current that loads the network without doing work, dragging PF down. DISCOMs recover that burden two ways — an explicit PF penalty on kWh tariffs, or kVAh billing, where energy is metered as kWh ÷ PF so a poor power factor inflates your billed units automatically. Households are almost never affected; commercial and industrial connections routinely are.

Power factor in plain terms

Think of a mug of beer: the liquid is kW (real power that does work), the foam is kVAR (reactive power that fills the mug without quenching thirst), and the whole mug is kVA (apparent power the network must carry). PF is liquid ÷ mug:

PF = 1.0 — purely resistive load (heaters, incandescent bulbs). All current does work.
PF ≈ 0.8 — typical uncorrected motor-heavy load. The network carries 25% more current than the useful power requires.
Low PF hurts the grid, not the appliance: cables, transformers and generators are sized by kVA, so reactive current wastes their capacity and increases losses. That's why regulators let DISCOMs charge for it.

The two billing mechanisms — penalty vs kVAh

	PF penalty / incentive (kWh tariffs)	kVAh billing
How it works	Energy is billed in kWh; a separate surcharge applies if average monthly PF falls below the threshold in the tariff order, and some states pay an incentive above a higher threshold.	Energy is metered and billed in kVAh = kWh ÷ PF. No separate penalty line — a PF of 0.9 silently bills ~11% more units than the work you used.
Where you see it	A "PF surcharge/penalty" or "PF incentive" line on the bill.	The units line itself says kVAh; demand is billed in kVA. Many HT and large-LT commercial tariffs have moved this way.
Who is affected	Commercial and industrial connections with motors, compressors, welding sets or large HVAC. Domestic supplies are billed flat kWh with no PF term in almost every state.

Which regime applies to you is stated in your tariff schedule — check your category on our state tariff pages, and if your bill shows kVAh units or a kVA maximum demand, use the kVA-based option in the bill calculator to reproduce it.

Reading PF off your bill — and the arithmetic check

Find the PF field (bills print the month's average PF, computed from kWh and kVAh registers).
On kVAh billing: check kVAh ≈ kWh ÷ PF. If the bill shows kWh 9,000, PF 0.9, the kVAh line should read ~10,000. A mismatch means a register or data-entry error.
On kWh billing with a penalty line: confirm the month's PF is actually below the threshold in your tariff order before the penalty percentage is applied — reviewers regularly find penalties applied at compliant PF.

If the lines refuse to reconcile, our free expert bill review can audit the bill against your tariff schedule.

Fixing a low power factor

Capacitor banks — the standard fix. Capacitors supply the reactive current locally so the grid doesn't have to; automatic PF-correction (APFC) panels switch capacitor steps to track the load and hold PF near unity.
Payback is fast where kVAh billing applies: raising PF from 0.85 to 0.99 cuts billed units by ~14% for the same real consumption, and demand billed in kVA falls with it.
Size to the load — over-correction (leading PF) is also penalised in several tariff orders. An electrician sizes the bank from your motor loads and the PF history printed on past bills.

Frequently asked questions

What is a good power factor for an electricity connection?

As close to 1.0 (unity) as practical. Most tariff orders treat roughly 0.9 and above as compliant; incentives, where offered, typically start above 0.95. Below the threshold, kWh tariffs add a PF surcharge, and kVAh tariffs inflate billed units automatically.

Does power factor affect home electricity bills in India?

Practically no. Domestic tariffs bill flat kWh with no PF term in almost every state, and household PF is decent anyway with modern electronics. PF penalties and kVAh billing target commercial and industrial connections with significant motor loads.

What is kVAh billing?

Under kVAh billing the meter records apparent energy — kWh ÷ power factor — and the tariff prices those units. A PF of 0.9 means about 11% more billed units for the same real consumption, which is why kVAh tariffs need no separate PF penalty line.

How do capacitor banks improve power factor?

Inductive loads like motors draw reactive current from the grid. Capacitors supply that reactive current locally, so the grid only carries the useful component — raising PF toward unity, cutting kVAh units and kVA demand. APFC panels switch capacitor steps automatically as the load varies.

Now check your own bill

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General guidance based on publicly available tariff orders and regulations; specifics vary by state, DISCOM and consumer category. Verify against your DISCOM's official schedule or your printed bill.