This is a quick introduction to voltage optimisation and how you can make changes to save energy and money.

For more information please look at the following pages:

 It’s likely that voltage optimisation will only be of interest to you if you have particularly high electricity bills. The percentage savings are likely to be modest, so it really only makes financial sense when your bills are high.

What is voltage optimisation?

Your home electricity supply is delivered at around 240 volts. However, many domestic appliances are designed to run at 220V which is the normal supply on the continent.

Voltage optimisation (VO) reduces and smooths the voltage of your home’s incoming supply to around 220V. This reduces the amount of energy used in your home which is wasted as heat, especially in devices with motors such as fridges and washing machines. 

Is it worth fitting in my home?

To achieve worthwhile savings, voltage optimisation should only be fitted in homes where the supply voltage exceeds 240V and where electricity consumption is relatively high (and cannot easily be reduced by other means).

Potential costs and savings

VO devices cost from £350 up to around £1500, plus an estimated fitting cost of £200 by a qualified electrician.  A recent trial found average electricity savings of around 5%.




Home Energy – Voltage Optimisation (L0)