Customers in Great Britain could be saved up to £12 million annually following a year-long trial of voltage controllers in Electricity North West's substations.
The network found using the cutting-edge technology could cut costs in the North West by £100 million over the next 25 years and by £300 million over the whole of Great Britain.
"Voltage controllers could save a 'significant amount' of power for the region, make the network more flexible while helping save customers money."
The findings came after a 12-month trial, during which voltage controllers were installed at 60 substations, each serving around 10,000 customers, as part of Electricity North West CLASS project.
The aim of the project was to balance the network by using the technology to reduce the voltage across Electricity North West's network by small amounts without disrupting customers' service.
Steve Cox, engineering and technology director for Electricity North West, said the network was always looking at how new technology could improve services and reduce costs for customers.
He said the voltage controllers could save a "significant amount" of power for the region, make the network more flexible while helping save customers money.
The firm will now install the technology at up to 260 substations across the North West after awarding a contract to Schneider Electric to supply the devices.