Power Factor Penalties Explained: The Hidden 10-25% Surcharge

Most facility managers don’t know what “power factor” means. But if yours is below 0.90, you’re paying thousands in monthly penalties—and they’re buried in your bill where you won’t notice them.

What Is Power Factor?

Power factor measures how efficiently your facility uses electricity.

Simple explanation: Not all the electricity flowing into your building does useful work. Some of it gets “trapped” in motors, transformers, and other inductive equipment, circulating back and forth without actually powering anything.

Power factor is the ratio of:

Real power (kW): The electricity doing actual work
Apparent power (kVA): Total electricity flowing (including the wasted portion)

Perfect efficiency = 1.0 power factor (all electricity does useful work)
Poor efficiency = 0.70–0.85 power factor (20–30% of electricity is wasted)

Why Utilities Penalize Poor Power Factor

Utilities have to generate and deliver all the apparent power (kVA), even though only the real power (kW) does useful work for you.

From their perspective, low power factor means they’re delivering extra current through their wires for no productive purpose. It increases their transmission losses and requires larger equipment.

So they charge you extra for it.

How to Check Your Power Factor

Step 1: Look at your utility bill

Find these two numbers:

kW demand: Your peak real power
kVA demand: Your peak apparent power

Power Factor = kW ÷ kVA

Example:

Peak kW: 3,500
Peak kVA: 4,375
Power Factor: 3,500 ÷ 4,375 = 0.80

Problem: Most utilities penalize power factor below 0.90. At 0.80, you’re paying significant penalties.

How Much Are Penalties Costing You?

Method 1: KVA-based billing

Some utilities bill you for kVA instead of kW when your power factor is poor.

Example:

Demand charge rate: $15/kW/month
Your actual kW: 3,500
Your kVA: 4,375
Billed demand: 4,375 kVA × $15 = $65,625/month
What you should pay (at 0.95 PF): 3,684 kW × $15 = $55,260/month
Penalty: $10,365/month = $124,380/year

Method 2: Direct penalty multiplier

Other utilities add a direct surcharge for power factor below their threshold (usually 0.90).

Typical penalty: 0.5% charge for every 0.01 below 0.90

Example at 0.80 PF:

You’re 0.10 below threshold (0.90 – 0.80)
Penalty: 10 × 0.5% = 5% surcharge
On a $200K/month bill: $10,000/month = $120,000/year

What Causes Poor Power Factor?

Main culprits:

Induction motors running at partial load: Motors are least efficient when running at 30–60% capacity
Older transformers: Legacy transformers have higher magnetizing current (wasted reactive power)
Fluorescent lighting with magnetic ballasts: Older lighting creates massive reactive load
Uncompensated inductive loads: Pumps, chillers, air handlers without power factor correction

How to Fix Poor Power Factor

Solution 1: Capacitor banks
Install capacitors to offset reactive power. Cost: $20K–$80K. Payback: 1–3 years if penalties are high.

Solution 2: Upgrade to high-efficiency equipment
Replace magnetic ballast lighting with LEDs. Upgrade oversized motors. Replace aging transformers.

Solution 3: Right-size motor loads
Motors running at 40% capacity have terrible power factor. Use variable frequency drives (VFDs) or replace with appropriately-sized motors.