The Problem
Water treatment and distribution is an energy-intensive business. Pumps, aeration blowers, and UV disinfection systems run continuously, and virtually all modern installations use VFDs for efficiency. But those VFDs create a hidden problem: harmonic distortion that wastes energy, damages equipment, and causes the nuisance SCADA trips that keep your team firefighting.
What Causes It
The 6-pulse rectifier front-end of a standard VFD draws current in sharp pulses, generating characteristic harmonics at the 5th, 7th, 11th, and 13th orders. With a dozen pumps and blowers on VFDs, these harmonics combine to create system-wide distortion that increases I²R losses, overheats motor windings, and interferes with sensitive SCADA and PLC equipment.
Why SCADA systems are particularly vulnerable + Read more− Close
SCADA controllers and PLCs are documented to experience logic faults when voltage THD exceeds 5%. At the 9.2% THDv typical of a VFD-heavy treatment works, communication errors on Modbus and Profibus networks cause intermittent sensor reading failures, control loop instability, and false alarms. These aren’t equipment faults — they’re power quality symptoms that disappear when THD is brought below 3%.
The Solution
HarmoniQ’s patented system uses narrowband tuning principles to maintain clean, stable power across your facility. Sampling conditions 20,000 times per second, it dynamically eliminates the harmonic distortion and voltage instability that VFDs create.
Reduces current THD from 15–30% to below 5%, and voltage THD to under 3%. Eliminates harmonic heating in motors and transformers, and stops the electrical noise that interferes with control systems.
Stabilises voltage during pump starts, blower cycling, and backwash sequences. Eliminates the voltage transients that cause SCADA communication faults and nuisance trips.
Manages power factor from 0.70–0.85 to 0.98+, handling reactive power swings from large motor starts and variable process loads without resonance risk.
The Impact
| Metric | Before | After HarmoniQ | Improvement |
|---|---|---|---|
| Power factor | 0.78 | 0.98+ | +25.6% |
| Voltage THD | 9.2% | <3% | −67% |
| SCADA nuisance trips | 3–5/month | Near zero | −95%+ |
| Annual electricity cost | $950,000 | $780,000 | −$173,000 |
Every facility is different. Our engineers will model the exact savings, deployment costs, and timeline for your specific site — get in touch for a free, no-obligation assessment.
Beyond the Bill
Pump motor rewinds cost $10,000–$44,000. Aeration blowers: $19,000–$76,000. Clean power extends asset life by 20–35%, reducing capital replacement cycles and unplanned downtime.
The UK water industry has committed to net zero by 2030. HarmoniQ delivers 28–68 tonnes of CO₂ reduction per year per facility — directly supporting Ofwat performance commitments.