Power Factor Penalties: Why kVA Is Costing You Money

There is a charge on many industrial and commercial electricity bills that pays for nothing you can use. It is the power factor penalty, and it appears when a facility draws more apparent power (kVA) than the real working power (kW) it actually converts into output. The gap is reactive power, and utilities bill you for the burden it puts on their system.

Power factor is the ratio of the two. As Fluke defines it, power factor is the ratio of working power measured in kilowatts to apparent power measured in kilovolt-amperes, or PF equals kW divided by kVA. A facility at 0.70 power factor is a vivid case: the US Department of Energy's Motor Challenge fact sheet describes a load where real power is 100 kW, reactive power is 100 kVAR, apparent power is 142 kVA, so power factor is 100 divided by 142, or 0.70, meaning only 70 percent of the current provided by the utility is being used to produce useful work.

The other 30 percent still has to be generated, carried, and delivered. Utilities recover that cost through a surcharge, and for a motor-heavy site it can be a meaningful line item that hides in plain sight. This guide explains the physics in plain terms, shows the real Canadian thresholds, and tells you how to find and fix the penalty.

kW, kVA, and kVAR: the power triangle

Three quantities describe the power a facility draws. BC Hydro describes them as real power (kW), the electricity your system uses to do useful work; reactive power (kVAr), the additional electricity needed to run items that produce a magnetic field; and apparent power, the combined total. Draw them as a right triangle: kW along the base, kVAR up the side, and kVA as the hypotenuse. Power factor is the angle between the base and the hypotenuse.

Reactive power is not wasted heat, it is the magnetizing current that motors, transformers, and fluorescent ballasts need to build the magnetic fields they run on. But it still occupies capacity on every wire and transformer between the generator and your plant. That is why the DOE fact sheet notes that low power factor is caused by inductive loads such as transformers, electric motors, and high-intensity discharge lighting, which are a major portion of the power consumed in industrial complexes.

Why utilities penalize low power factor

The logic is the same as demand charges: the utility must build capacity for the total current you draw, not just the useful part. The DOE fact sheet states that low power factor requires an increase in the electric utility's generation and transmission capacity to handle the reactive power component caused by inductive loads, and utilities usually charge a penalty fee to customers with power factors less than 0.95.

BC Hydro frames the charge directly: a power factor surcharge is applied to your account when your power factor is below 90 percent, and it is used to recover the cost of supplying reactive power to you. The threshold and the mechanism vary by utility, but the principle is universal. Below the line, you pay for the reactive burden you place on the grid.

Real Canadian thresholds and how the penalty is calculated

Canadian utilities use two main mechanisms: an escalating surcharge on the whole bill, or a switch that bills demand on kVA instead of kW.

BC Hydro's surcharge escalates sharply. There is no charge at 90 percent or above, but it is applied to the total of all other charges for the same period and rises as power factor drops, reaching 16 percent of the bill in the 75 to 79 percent band. In Ontario, Hydro One takes the demand-billing route: if your power factor drops below 90 percent, Hydro One will bill based on 90 percent of peak kVA instead of 100 percent kW. Hydro-Quebec uses the same greater-of logic, with billing demand set to at least 90 percent of the highest apparent-power demand for medium-power rates and 95 percent for large power.

How to spot the penalty on your bill

Power factor penalties rarely carry an obvious label. Look for these signals:

• A demand charge billed on kVA rather than kW, or a note that demand is the greater of kW or a percentage of kVA.
• A distinct power factor surcharge or adjustment line expressed as a percentage of other charges.
• A printed power factor value. BC Hydro confirms your power factor is displayed on your bill as a percentage.
• kVAR or reactive demand appearing as a metered quantity alongside kW.
• Billed demand that runs consistently higher than your metered real-power (kW) demand.

If your demand is billed in kVA, the penalty is baked into the demand charge itself and will not show as a separate line, which is exactly why it goes unnoticed. A structured, month-over-month view of demand and kVA is the surest way to catch it.

How power factor correction works

Correction adds reactive power locally so the utility does not have to supply it. The usual tool is capacitor banks, which the DOE describes as decreasing the magnitude of reactive power. Its worked example is instructive: starting from a 0.70 power factor on a 100 kW load, installing a 67 kVAR capacitor reduces apparent power from 142 to 105 kVA, a 26 percent reduction in current, improving power factor to 0.95.

Correction equipment comes in fixed and automatic configurations. As BC Hydro notes, the power factor surcharge can be mitigated through the installation of power factor correction capacitors, available in fixed and automatic configurations depending on load variability, with a caution that capacitors can cause harmonic resonance and voltage rise at low load. In practice this is engineering work, but the payback is straightforward: the avoided surcharge is a recurring monthly saving that the capacitor cost is measured against.

How MartinAI helps

You cannot correct a penalty you cannot see, and power factor is one of the most easily overlooked figures on a bill because it often hides inside the demand charge. MartinAI reads utility bills across every commodity and layout, capturing demand, kVA, and power factor adjustment charges into a clean whole-building record. That makes a hidden surcharge visible and comparable across every meter and month.

With that record, you can rank sites by their power factor exposure, quantify the recurring surcharge each low-power-factor meter carries, and build the business case for correction on real numbers. MartinAI validates the bill data and produces the clean cost history that supports that analysis, so the decision to install capacitors rests on documented penalties rather than a one-off invoice someone happened to notice.

Conclusion

Power factor penalties are avoidable. The threshold to clear in Canada is generally 0.90, the cause is almost always inductive load, and the fix is well understood correction equipment with a measurable payback. The hard part is visibility: knowing which meters are below the line and how much the penalty adds up to over a year. Get that in front of you, and the rest is engineering.