Stop Wasting Money: A Guide to Avoiding DISCOM Power Factor Penalties

If you manage an industrial plant in India, opening the monthly utility bill can bring an unpleasant surprise.

State regulatory updates for FY 2026 – 27 have made power quality compliance stricter than ever. For example, the Gujarat Electricity Regulatory Commission (GERC) has reinforced its penalty structure:

• Power Factor (PF) above 0.90 – No penalty
• PF between 0.85 and 0.90 – 1% of the entire energy charge for every 1% drop
• PF below 0.85 – 2% penalty for every 1% drop

For an HT consumer with a 500 kVA contract demand, operating at 0.85 PF can add ₹25,000 – ₹50,000 to the monthly electricity bill resulting in lakhs of rupees in avoidable annual expenses.

With state DISCOMs tightening compliance through trivector meters, poor power factor is no longer just a technical issue, it has become a direct financial liability.

This guide explains how to avoid reactive power penalties, maintain optimum power factor, and keep your Automatic Power Factor Correction (APFC) panel operating efficiently.

Why Low Power Factor Increases Your Electricity Bill

Before solving the issue, it’s important to understand what your utility is measuring.

Power factor is a measure of how efficiently electrical power is being utilised. It ranges from 0 to 1, with a value close to 1.00 indicating efficient use of supplied electricity.

Active Power (kW):
Active power is the useful power that performs actual work in your plant. It runs motors, machinery, pumps, compressors, and other production equipment, directly contributing to your operations.

Reactive Power (kVAR):
Reactive power is the power needed to maintain magnetic fields in inductive equipment such as motors and transformers. Although it doesn’t perform useful work, excessive reactive power lowers your power factor and can result in power factor penalties if it isn’t properly compensated.

Apparent Power (kVA):
Apparent power is the total power supplied by the utility and is the combination of active power and reactive power. Utilities use this value to calculate demand charges, which is why reducing unnecessary reactive power helps lower electricity costs.

When power factor falls below the utility’s prescribed limit (typically 0.90 – 0.95), the DISCOM supplies more apparent power than necessary because of excess reactive current.

The result?

• Higher demand charges
• Power factor penalties
• Increased electrical losses
• Reduced system efficiency

Maintaining a higher power factor can also help industries qualify for utility rebates wherever applicable.

APFC Panel Maintenance Checklist for Industrial Plants

Most industrial facilities rely on an Automatic Power Factor Correction (APFC) panel to manage reactive power automatically.

However, regular maintenance is essential to ensure consistent performance.

1. Perform Visual Inspection

Inspect capacitor banks for:

• Swelling
• Bulging
• Oil leakage
• Physical damage

Faulty capacitors lose their ability to provide proper compensation.

2. Conduct Thermal Scanning

Use an infrared thermometer to identify hot spots on:

• Contactors
• Busbars
• Cable terminations

High temperatures often indicate loose connections or overloaded components.

3. Monitor Capacitor Current

Measure the current drawn by every capacitor stage.

Lower-than-normal current usually indicates loss of capacitance and the need for replacement.

4. Verify APFC Controller Operation

Ensure the controller:

• Switches capacitor steps correctly
• Does not repeatedly switch stages (hunting)
• Maintains the target power factor

Improper controller operation significantly reduces component life.

5. Check Panel Ventilation

Clean cooling fans and replace clogged filters.

Lower operating temperatures improve capacitor life and system reliability.

Protect Your Bottom Line with Clariant Power Solutions

Don’t let poor power factor reduce your operational profitability.

Clariant Power’s Power Quality Management Solutions are designed to maintain near-unity power factor even under demanding industrial conditions.

Request a Power Quality Audit Today

Automatic Power Factor Correction Panel Troubleshooting Guide

If your power factor begins to deteriorate despite having an APFC panel, the following troubleshooting guide can help identify the cause quickly.

Controller Displays “Low PF” While All Steps Are ON

If all capacitor steps are active but the power factor remains low, the installed capacitor capacity may be insufficient or the capacitors may have degraded. Upgrade the panel’s kVAR rating or replace faulty capacitor stages.

Frequent Capacitor Switching (Hunting)

Frequent switching usually indicates incorrect APFC controller settings, such as the target power factor or C/K ratio. Reconfigure the controller based on the smallest capacitor step.

Capacitor Overheating or Repeated Failures

Overheating is often caused by harmonic distortion from VFDs or other non-linear loads. Installing detuned reactors or harmonic filters helps protect the capacitor bank.

Incorrect or Zero Power Factor Reading

An incorrect power factor reading is commonly due to improper CT installation or reversed polarity. Verify the CT’s orientation and placement to ensure accurate measurements.

Three Ways to Eliminate Reactive Power Penalties

Long-term savings come from permanent improvements rather than temporary fixes.

1. Upgrade from Fixed to Automatic Compensation

Fixed capacitor banks are suitable for constant loads but struggle in plants with varying production demands.

Automatic systems continuously calculate reactive power requirements and compensate accordingly.

2. Control Harmonic Distortion

Modern facilities using:

• Variable Frequency Drives (VFDs)
• CNC machines
• Automation systems
• LED lighting

often experience high harmonic distortion.

Standard capacitor banks may amplify harmonics, leading to capacitor failures and unstable voltages.

Installing Detuned APFC Panels or Automatic Harmonic Filter Panels (AHPFC) significantly improves reliability.

3. Schedule Regular Power Quality Audits

A professional power quality audit records your electrical load over a 24–72 hour period.

This enables engineers to determine:

• Required kVAR capacity
• Proper capacitor sizing
• Harmonic levels
• System optimisation opportunities

The result is better compensation without overcorrection.

Upgrade to Smart Power Quality Compensation

Traditional compensation systems may not be sufficient for today’s electrically demanding industrial environments.

Clariant Power’s Thyristor Switched Automatic Harmonic Filter Panels (RTPFC) and Active Harmonic Filters (AHF) deliver:

• Fast reactive power compensation
• Harmonic mitigation
• Stable power factor
• Improved equipment protection
• Lower utility penalties

Speak with a Clariant Power Quality Expert

Conclusion

In today’s regulatory environment, operating with an outdated or poorly maintained power factor correction system can become an expensive mistake.

For many industries, the money lost through recurring DISCOM penalties can exceed the investment required for a modern power quality solution.

By implementing:

• Smart APFC systems
• Harmonic-resistant compensation
• Routine maintenance
• Periodic power quality audits

you can reduce electricity costs, improve equipment performance, and eliminate unnecessary utility penalties.

Don’t wait for the next electricity bill to expose hidden inefficiencies.

Take control of your power quality today and turn avoidable penalties into long-term operational savings.