Four million customers switched their electricity suppliers in 2016.
This tops the past three years of switching figures, according to Energy UK.
Switching in November alone rose above 400,000 as consumers made the most of the wide variety of deals on offer.
Lawrence Slade, Chief Executive of Energy UK, said: “Over 40 companies across the industry, big and small, are working hard to win customers. With the Energy Switch Guarantee now in place, customers can be more confident to switch supplier.
“I’d encourage everyone to look at the best deal for them, whether that is one that offers a lower price or better customer service, there are choices for everyone.”
He added although the record number of switches seen this year was great news, more needs to be done to make sure there are even more in 2017.
Energy consumers could save as much as £261 a year without even having to move to a different supplier.