Project Summary


Installation of 1 x EMC 250i Voltage Optimiser on the supply at Belton House

The National Trust


A charity organisation that works to preserve and protect historical places. The National Trust has chosen Voltage Optimisation as part of their approach to reduce overall energy consumption, and hit their ‘green energy’ targets by 2020, they independently test and verify savings achieved regularly. The National Trust approached GWE to conduct an energy analysis
on site, to work out why there were power quality issues (eg. security alarms supplies were often tripping out). GWE established the voltage and load profile, and proposed that implementing a VO project would correct these problems and yield energy cost savings as well.

11.4% average energy savings achieved by the ECO-MAX.
Saving of £3,788 per year, with payback under 2.5 years


The graph shows the pre and post installation average daily kW readings, and the kWh consumption saved over the four periods of analysis (1 day, 7 days, 28 days and 3 months).



• GWE anticipated consumption savings of 10.6%, with a projected project payback of 29 months and ROI of 44.1%. These were all exceeded in subsequent post install analysis, and average savings of 11.4% were recorded.

• Since the installation there is less nuisance tripping of fire & security alarms so there are less disturbances and ‘false alarms’

• Due to the reduction in voltage spikes and fluctuations from the installation of the ECO-MAX units, electrical equipment on the sites will now have a longer operational life and will work more effectively at the reduced voltage, reducing maintenance costs

Voltage Optimisation “… is great for the Trust. We can direct money that would otherwise have been spent on electricity to our conservation
work elsewhere at the property.

Charis Fowler

Environmental Practices Advisor, National Trust

More Case Studies

Riverford Farm

 Case Study Riverford Farm June 2018 232 kWp – Design, supply, install and commission. The Riverford Farm Solar PV farm consists of 10 rows of ground-mounted solar PV. There are 15 SMA inverters connected to a dedicated substation. The system is monitored remotely and...

read more

The Blue Sea Food Company

 Case Study The Blue Sea Food Company June 2018 The Blue Sea Food Company, a Paignton based sustainable crab fishing company, are on a mission to go green and, thanks to an installation by renewable energy company Beco Energy, have considerably reduced their carbon...

read more