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July 2026 · Energy Management · Updated October 2026

kVAh vs kWh Billing — What Changed and What It Costs You

Reviewed by Ramniwas Gautam, Validation Head, Tech OVN

Many commercial and industrial electricity consumers in India have noticed that their bills now charge in kVAh rather than kWh — and that the total is higher than expected. Understanding the difference between apparent and real energy is the first step to reducing the cost. The second is understanding how power factor monitoring gives you the numbers you need to act on it.

kWh and kVAh — the fundamental difference

kWh (kilowatt-hours) measures real energy — the portion of electricity that performs useful work: turning a motor shaft, generating heat in a furnace, lighting a lamp. It’s the number most people associate with their electricity bill.

kVAh (kilovolt-ampere-hours) measures apparent energy — the total energy drawn from the grid. In any facility with inductive loads (motors, transformers, welding equipment, induction furnaces), the grid must supply not just the real power that does work but also reactive power that sustains the magnetic fields those loads require. Reactive power travels back and forth between the load and the source without doing useful work — but it still flows through cables and transformers, generating losses and occupying grid capacity.

The relationship between the two is straightforward:

kVAh = kWh ÷ Power Factor

At a power factor of 1.0 (unity), kVAh equals kWh — every ampere drawn is doing useful work. As power factor drops below unity, kVAh rises above kWh. At PF 0.85, kVAh is approximately 18% higher than kWh. At PF 0.80, the gap is 25%. This is the cost of poor power factor, expressed directly in units rather than in a separate penalty line. The rupee effect also depends on the per-kVAh rate your DISCOM set when it switched, which is usually lower than the old per-kWh rate (see below).

Why billing switched from kWh to kVAh

Under a kWh tariff, two consumers paying the same per-unit rate might have very different impacts on the grid. A factory running motors at PF 0.75 draws far more apparent current than one running the same real load at PF 0.95 — the same transformer, the same feeder, but one consumer generates far higher losses and occupies far more of the utility’s capacity. Under kWh billing, both pay the same per-unit rate.

Several Indian state regulators have addressed this by moving C&I consumers to kVAh billing. Under kVAh billing, the consumer pays for apparent energy drawn, which automatically reflects the reactive burden. A consumer with poor PF pays for more apparent units; a consumer with good PF pays for fewer. The cost of poor PF is built into every unit charged, every month.

The shift is not nationwide, and which categories it covers differs by state. Three examples:

  • —Delhi (BSES Rajdhani, BSES Yamuna): DERC’s tariff schedules charge energy in paise per kVAh for non-domestic and industrial connections above 10 kW / 11 kVA, which includes LT connections (see the DERC tariff schedule).
  • —Maharashtra (MSEDCL): MERC moved HT consumers to kVAh billing from 1 April 2020 in its order in Case No. 322 of 2019, while LT kVAh billing for loads above 20 kW was scheduled for a later phase (see MSEDCL’s kVAh FAQ).
  • —Gujarat (Torrent Power, Ahmedabad): GERC’s tariff schedule for Torrent Power Ahmedabad (w.e.f. 1 April 2026) still prices energy per kWh and applies a separate power factor adjustment: a rebate when the average PF for the billing period is above 90%, and a penalty when it is below 90% (tariff schedules are published by GERC).

Tariff orders change every year, so confirm the current position for your own connection. The key line is the energy charge rate: if it says “per kVAh” rather than “per kWh”, your power factor directly inflates your unit count.

One caveat: a switch to kVAh does not automatically raise every bill. Regulators usually set the per-kVAh rate lower than the old per-kWh rate, so that a consumer near unity PF pays about the same or less. When MERC introduced kVAh billing, the HT industrial rate moved from about ₹8.52 per kWh to about ₹7.59 per kVAh (energy charge plus FAC and wheeling, per the AISSMS IOIT summary of the MERC order). The consumers whose bills rose were mainly those with poor power factor.

What the gap costs in practice

The rupee impact of kVAh billing is directly proportional to how far PF sits below unity. Consider a facility consuming 100,000 kWh in a billing month under a kVAh tariff:

Power FactorkVAh billedExtra units vs unity PF
1.00 (unity)100,000 kVAh—
0.95~105,263 kVAh+5,263 units
0.90~111,111 kVAh+11,111 units
0.85~117,647 kVAh+17,647 units
0.80125,000 kVAh+25,000 units

Multiply the extra units by your per-kVAh tariff rate and the monthly cost of poor PF becomes clear. The gap between PF 0.85 and PF 0.95 is over 12,000 extra units (about 12,384) per 100,000 kWh consumed, every month. Where a connection is billed in kVAh, a separate PF penalty clause is normally not applied as well; check your tariff order to confirm.

How to reduce your kVAh — and close the gap

kVAh falls in two ways: use less real energy (kWh), or improve power factor. The second lever is the one that closes the kVAh-to-kWh gap, and the action for it is in the correction equipment:

Check that existing correction is actually working

Many facilities have a capacitor bank or APFC (Automatic Power Factor Correction) panel that was correctly sized and commissioned years ago — but has since had stages fail silently. A blown capacitor, a dropped contactor, a blown fuse in the capacitor circuit — any of these removes correction capacity without any alarm. If your kVAh billing cost has risen without a change in load, a failed APFC stage is the first thing to check.

Track kWh and kVAh simultaneously

The kVAh-to-kWh ratio is a direct, continuous readout of power factor. Monitoring both parameters together — rather than reading kVAh off the utility meter and kWh from a separate source — gives you the gap in real time. When a correction stage fails, the ratio widens immediately: kVAh rises relative to kWh, and PF drops. You can correlate the change to a specific time, shift, or load event.

Set a monitoring alert before the billing impact

If your kVAh billing starts to penalise at a particular PF, set your kVAh monitoring alert above that threshold — so you have a buffer to investigate and fix the issue before it flows through to the bill. The goal is to catch the gap widening on day one, not on billing day.

The Titan energy meter (Class 0.5S per IEC 62053-22) measures kWh, kVAh, kVArh, and power factor simultaneously on all three phases. On the Tech OVN cloud dashboard, you can track the kVAh-to-kWh spread over time, set alerts on PF or kVAh thresholds, and see exactly how much apparent energy is being billed above real energy — and when that gap started. Titan monitors and measures; it does not correct PF (that is the APFC panel’s job). But without measurement, you have no way to know correction is failing until the bill arrives.

Frequently Asked Questions

Common questions about kVAh and kWh billing for Indian C&I consumers.

kWh (kilowatt-hours) measures real energy — the portion that performs useful work such as running motors, lighting, or heating. kVAh (kilovolt-ampere-hours) measures apparent energy — the total energy drawn from the grid including the reactive component that inductive loads require but do not convert to useful output. The relationship is: kVAh = kWh ÷ power factor. At unity PF (1.0), they are equal. Below unity, kVAh is always higher than kWh.
Several Indian state DISCOMs have shifted C&I consumers from kWh to kVAh billing to ensure that all consumers pay for the reactive burden they place on the grid. Under kWh billing, a consumer with poor PF paid the same per-unit rate as one with good PF, even though poor PF generates higher grid losses and reduces available capacity. kVAh billing makes the cost automatic and proportional to actual apparent energy drawn.
In units, the gap depends only on power factor: at PF 0.85 you are billed about 18% more kVAh than kWh, at PF 0.90 about 11%, at PF 0.95 about 5%, and at unity PF the two are equal. The rupee difference is not the same thing, because DISCOMs usually reset the per-unit rate when they switch. In Maharashtra, for example, the HT industrial rate went from about ₹8.52 per kWh to about ₹7.59 per kVAh when MERC introduced kVAh billing from 1 April 2020 (energy charge plus FAC and wheeling, per the AISSMS IOIT summary of MERC Case No. 322 of 2019). A site near unity PF can therefore pay less after the switch, while a site with poor PF pays more. Compare against your own tariff order.
Usually not. Because kVAh billing already prices poor PF into every unit, regulators normally drop the separate PF incentive/penalty clause for consumers billed in kVAh. MSEDCL's own kVAh FAQ says the kVAh mechanism makes a separate PF incentive/penalty unnecessary. Consumers still billed in kWh (for example, LT categories not yet moved to kVAh) keep the PF clause. Check your current state tariff schedule to see which applies to your connection.
There are two levers. You can use less real energy (kWh), which reduces kVAh in proportion, or you can improve power factor, which closes the gap between kVAh and kWh. For the gap, make sure your capacitor bank or APFC panel is correctly sized, working, and switching all its stages. A single failed capacitor stage can lower PF noticeably. Monitor PF and the kVAh-to-kWh ratio continuously: when the ratio widens, correction is failing, and you see it before the bill does.
Yes. Titan (Class 0.5S per IEC 62053-22) measures kWh, kVAh, kVArh, and power factor simultaneously on all three phases. On the Tech OVN dashboard you can see the kVAh-to-kWh ratio over time, track how the gap changes with load and time of day, and set alerts if PF drops below a value that would widen your billing gap.

Related Reading

Resources on kVAh billing, power factor, and energy monitoring.

kVAh Billing — Solution Overview

How Tech OVN's kVAh monitoring capability helps C&I consumers track apparent energy, understand the kWh-to-kVAh gap, and quantify the cost of poor PF.

Learn More →

Power Factor Monitoring

Continuous PF monitoring with threshold alerting — so a failed APFC stage shows up on your dashboard the day it happens, not on the next bill.

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Titan — Class 0.5S Smart Energy Meter

Three-phase DIN-rail energy meter measuring kWh, kVAh, kVArh, PF, and demand simultaneously. Class 0.5S per IEC 62053-22.

Learn More →

Multifunction meter (MFM)

3-phase Class 0.5S multifunction meter in a 96 × 96 mm panel housing, with RS485 Modbus, Modbus TCP and MQTT. Measures kWh, kVAh, kVArh, PF and demand. From ₹ 7,500.

Learn More →

See your kVAh gap in real time

Titan measures kWh, kVAh, and PF simultaneously — so you can see exactly what poor power factor is costing and catch it the day it worsens.

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