According to its figures, nearly half of the 259,855 households that changed their supplier in September opted for an independent supplier.
This was the second highest monthly rate of customers who moved to small suppliers since 2012, although September’s numbers still fall short of those seen in April this year.
Three times as many people moved to a small provider last month than they did in the same time last year, the report added.
Energy UK’s chief executive, Angela Knight said this was because of increased market competition.
“Smaller electricity providers are gaining a larger chunk of the market month on month on month. This is because the market is becoming more and more competitive as time goes on. More suppliers are joining the sector, more customers are shopping around and all suppliers are fighting hard for new business,” Knight said.