This is a ‘staggering’ 58% increase from June 2014.
Over two million (2,323,694) customers have switched in the first half of the year, which is almost one million (1,515,993) more than in the first six months of 2014.
The latest electricity switching data also shows 120,115 customers switched to small and mid-tier suppliers in June which is 33% of all switches for the month.
Lawrence Slade, Chief Executive of Energy UK, said: “It is great to see more and more customers shopping around over the summer months before winter hits. Over two million people have already switched supplier in 2016 and they have taken advantage of the fantastic deals offered by more than 40 suppliers.
“Since June 2014 the cheapest tariffs have fallen by over £200. There are now around 50 deals under £900 on offer. The new Energy Switch Guarantee – launched by the Industry last month – has made it even easier for customers to switch.”