If your company runs motors, transformers, welding equipment, or industrial lighting, there's a good chance you're paying a monthly penalty on your electricity bill without knowing it. The cause is almost always the same: a low power factor. It's one of the most common — and cheapest to fix — electrical issues in Ecuadorian industrial plants and commercial buildings.
What is power factor and why does it matter?
Power factor (PF) measures how efficiently your facility uses the electricity it draws. It's the ratio between active power (the power that does real work — running motors, lighting, welding) and apparent power (the total power the grid has to supply). A PF of 1.0 would be perfect; in practice, a value of 0.92 or higher is considered acceptable under Ecuadorian utility standards.
How Ecuadorian utilities penalize low power factor
Ecuador's electricity distributors (CNEL, Empresa Eléctrica Quito and similar utilities) measure power factor for medium- and high-voltage industrial and commercial customers. When the monthly average PF falls below the required minimum, a surcharge is applied directly to the bill, calculated as an additional percentage on top of billed consumption. This surcharge can repeat month after month indefinitely until the underlying issue is corrected.
The most common causes of low power factor are:
- Electric motors running below their rated capacity
- Transformers oversized for the actual load
- Fluorescent or discharge lighting without electronic ballasts
- Welding equipment and machines with frequent start-stop cycles
- No capacitor banks installed anywhere in the facility
Signs your business has a power factor problem
It isn't always obvious at a glance. The most common warning signs are:
- The electricity bill includes a line item for "power factor penalty" or "reactive power surcharge"
- The main transformer runs hot or saturates under loads that shouldn't demand that much
- Noticeable voltage drops when large motors start up
- No capacitor bank has ever been installed or inspected on site
The most accurate way to confirm it is with a power quality analyzer during an electrical audit, which measures real PF across different operating hours — not just the monthly average reported on the bill.
How to correct power factor
1. Fixed capacitor bank
Best for stable loads with little variation throughout the day. It compensates a fixed amount of reactive power and is the most affordable solution for small commercial sites or small plants.
2. Automatic capacitor bank
Adjusts compensation in real time based on the connected load, using a controller with switchable capacitor steps. It's the most common choice for industrial plants, since it avoids overcompensation when production slows down.
3. Harmonic filter (advanced cases)
When a facility has variable frequency drives, induction furnaces, or other electronic loads, standard capacitors may not be enough. In those cases, a detuned capacitor bank or an active harmonic filter is required.
4. Ongoing maintenance and inspection
A capacitor bank isn't a set-it-and-forget-it fix. Capacitors degrade over time, especially in hot or dusty environments — common conditions in Ecuadorian industrial plants. An annual check with a power quality analyzer confirms your PF is still within the required range and catches failing capacitors before the penalty reappears on your bill.
| Reactive power to correct | Typical solution | Estimated cost |
|---|---|---|
| Up to 10 kVAR Small shop or business |
Fixed capacitor bank | From USD 400 depending on the kVAR to compensate |
| 10 – 50 kVAR Small industrial company |
Automatic bank (3-5 steps) | From USD 900 depending on the kVAR and bank steps |
| 50 – 150 kVAR Mid-size industrial plant |
Automatic bank + harmonic filter | From USD 2,500 depending on the kVAR and harmonic level |
| +150 kVAR Large plant / substation |
Custom system with active filter | Custom quote |
For an estimate based on your company's load, use our electrical project quote tool.
Benefits of correcting power factor
- Eliminates the monthly surcharge on your electricity bill for good
- Frees up transformer capacity so you can grow without buying a bigger unit
- Reduces losses from heating in cables and equipment
- Improves voltage stability, extending the life of motors and electronics
- In most cases, the investment pays for itself within 6 to 18 months from penalty savings alone
Before installing any capacitor bank, the correct first step is to measure. An electrical diagnostic using a power quality analyzer shows exactly how many kVAR you need to correct and at what hours, avoiding an oversized (wasted spend) or undersized (still fined) solution.
Does your electricity bill show a power factor penalty?
At EB Corp we measure your real power factor, design the right capacitor bank for your load, and install it to NEC/IEC standards. You can also check our reference pricing for electrical projects. The diagnostic visit is free in Carchi and Imbabura (Ibarra, Tulcán, El Ángel and surrounding areas); for Quito and the rest of the country we offer a free phone consultation and a quoted site visit.
Written by the EB Corp team.