Peterborough has been named the city in England with the most energy switchers.
However more people in the area could still save money by changing their energy deal, says Citizens Advice Peterborough.
Around one in every five Peterborough households switched their electricity meter to a different supplier between October 2015 and September 2016 - adding up to the highest switching rate in England.
In total 15,520 city households switched to a new energy supplier. Over the same period 4,455 homes switched at least one supply to local provider Peterborough Energy - the city council's tariff in partnership with OVO Energy.
This supports the national trend of consumers moving away from the Big Six to small and medium sized suppliers, in a bid to find more competitive deals.
Citizens Advice Peterborough is encouraging even more people to join the growing ranks of households switching to a cheaper deal to make savings on their energy bills.
Keith Jones, Chief Executive of Citizens Advice Peterborough said: “Switching to a new energy deal can help people make substantial savings on an essential living cost.
“It’s good news that households in Peterborough are reaping the financial benefits of changing to a better deal - but we want even more people to consider switching.
“Citizens Advice Peterborough can help people do this, our advisers can check how much you’re paying and compare prices so you can work out if you could cut your bills by going to another supplier.”
Latest analysis by Citizens Advice has found that more people in the East of England could be saving money - over £135 - by switching to a cheaper electricity tariff. The charity estimates that as many as 4.7 million households in England have stayed with the same supplier for at least the last 10 years - many will be on standard variable tariffs, usually the most expensive bill.
Councillor John Holdich, Peterborough City Council leader, said: "Citizens Advice’s research shows that many households are still paying too much for their energy. I'd encourage everyone to shop around, including looking at our own local Peterborough Energy tariff which has a reputation for being competitive."