Voltage optimisation ROI — when does VO pay back?
Voltage optimisation typically delivers a 5-15% electricity saving for candidate UK commercial sites, with a 2-3 year payback. The savings then continue for the 10-15+ year asset life. The skill is knowing which sites qualify — and which don't.
The basic case
UK grid voltage is allowed to sit anywhere within a regulated range, and in practice most sites are supplied at the upper end. A voltage optimisation unit drops the voltage to a stable optimal level and prevents the waste. For candidate sites, this delivers a 5-15% reduction in electricity consumption.
When VO works well
- Older equipment rated for lower voltages.
- Motor-heavy loads — pumps, fans, conveyors, compressors.
- Significant lighting load on fluorescent or HID lamps.
- Continuous operation.
- Currently high incoming voltage (measured during the survey).
When VO doesn't work
Sites with mostly modern variable-speed-drive equipment, sites with predominantly LED lighting, specialist industrial processes requiring specific voltage, or sites with very low operating hours.
Modelling the ROI
A defensible VO business case has three components: baseline voltage measurement, savings model, and payback calculation.
Bottom line
VO is one of the highest-ROI interventions available for the right commercial site. It pays back in 2-3 years on candidate sites, then drops 5-15% off your electricity bill for the rest of the asset life.
Voltage optimisation ROI — when does VO pay back? — quick questions
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