Who it works for and why
Rising electricity costs are forcing many businesses to look more closely at how efficiently power is being used across their buildings. One solution that often comes up is voltage optimisation, but while it can deliver reliable savings, it is not suitable for every site.
At SMARTech energy, we regularly help businesses assess whether voltage optimisation is a sensible option, where it fits within a wider energy strategy, and how to avoid investing in solutions that won’t deliver meaningful results.
What is Voltage Optimisation?
Voltage optimisation is a technology that reduces incoming supply voltage to a level better aligned with the requirements of a building’s electrical equipment.
In the UK, electricity networks are permitted to deliver voltage within a relatively wide tolerance. Many commercial buildings receive supply at the upper end of this range, even though most equipment is designed to operate efficiently at lower voltages.
Excess voltage does not improve performance, it simply increases electricity consumption.
Why excess voltage is common in UK businesses
The distribution network is designed to ensure all customers receive sufficient voltage, including those furthest from substations. As a result, sites closer to substations or with stable network connections often receive consistently high voltage.
This is particularly common in:
- Industrial estates
- Warehouses and logistics hubs
- Large commercial and mixed-use buildings
Without measurement, businesses are often unaware that this is happening.
How voltage optimisation reduces electricity costs
Voltage optimisation systems regulate incoming voltage before it is distributed around the building. By reducing excess voltage:
- Electrical equipment draws less power
- Resistive and inductive losses are reduced
- Heat generation within equipment is lowered
The result is lower electricity consumption without changing how the building operates.
Savings are typically incremental rather than dramatic, but they are continuous and long-term.
Voltage optimisation tends to be most effective in buildings with:
- High and consistent electrical loads
- Long operating hours
- Equipment dominated by motors, lighting, and fixed electrical systems
Common examples include:
- Warehouses and distribution centres
- Manufacturing and processing facilities
- Retail estates and large offices
In these environments, even modest percentage savings can translate into significant cost reductions over time.
Is Voltage Optimisation worth it for your business?
The key question is not whether voltage optimisation can reduce energy use, it is whether it makes sense for your specific site.
With accurate data, businesses can determine:
- Whether excess voltage is present
- The scale of potential savings
- How voltage optimisation compares to other efficiency measures
When applied in the right context, voltage optimisation can be a reliable, low-disruption way to reduce electricity costs and support wider sustainability goals.
How Voltage Optimisation fits into a wider energy strategy
Voltage optimisation works best when it forms part of a broader approach to energy efficiency, rather than a standalone solution.
At SMARTech energy, we often assess voltage optimisation alongside:
- Energy monitoring and analytics
- Out-of-hours consumption reduction
- Control and scheduling optimisation
- Performance-based energy efficiency models
This ensures investment is targeted where it will deliver the greatest long-term value.
Typical energy savings and what influences them
In suitable sites, voltage optimisation typically delivers around 5–8% electricity savings, depending on incoming voltage levels and the building’s load profile.
When implemented as part of a wider energy efficiency programme, including monitoring, control optimisation and operational improvements, total electricity savings of 10–20% are commonly achievable, with higher savings possible in some sites.
Actual results depend on factors such as:
- Incoming voltage levels
- Load profile and equipment type
- Operating hours
- Site electrical infrastructure
Importantly, these savings are achieved without changing user behaviour or operational processes.
When VO is unlikely to deliver value
Voltage optimisation is not a universal solution. It may offer limited benefit where:
- Incoming voltage is already close to nominal levels
- Loads are predominantly IT equipment with internal power regulation
- Operating hours are low or irregular
- Energy consumption is already tightly controlled
This is why SMARTech energy always recommends measurement and assessment before installation, rather than assuming savings.
Effective energy efficiency starts with understanding how electricity is supplied and used in practice, not just what appears on a bill.
By combining measurement, analysis, and practical engineering insight, businesses can make confident decisions about which solutions will genuinely deliver value.
