What power factor means
Power factor compares useful power to total supplied power. Real power, measured in kW, does the work. Apparent power, measured in kVA, is the total demand placed on the electrical system.
A power factor of 1.0 means the load converts all supplied apparent power into useful work. Motors, transformers, welders, and other inductive loads usually operate below 1.0 because part of the supplied power supports magnetic fields.
Why it matters
Low power factor increases current for the same useful output. Higher current means larger conductors, more voltage drop, hotter equipment, and greater losses in the distribution system.
Many commercial and industrial utility tariffs include penalties or demand charges when power factor falls below a required threshold. Improving power factor can therefore reduce both technical losses and monthly cost.
- Lower current for the same kW load
- Better voltage stability at motors and panels
- More usable capacity from generators, UPS systems, and transformers
- Reduced risk of utility power factor penalties
How to improve it
The most common correction method is adding capacitors near inductive loads or at distribution panels. Capacitors supply reactive power locally, so less reactive current has to travel through upstream equipment.
Variable frequency drives, synchronous motors, and properly sized capacitor banks can all help. The right choice depends on load profile, harmonic content, switching frequency, and site operating conditions.