The smaller and independent supplier gained a total of 96,858 customers last month (40 per cent).
The proportion of switchers gained by independent suppliers is up from 26 per cent in December and 20 per cent in November.
Chief executive of Energy UK, Angela Knight, said: “Once again, the numbers of people switching are proof that the energy market is responding well and giving customers real choice when it comes to choosing an energy supplier.
“The energy industry is making huge changes to how it serves its customers and reforms are making choices clearer and switching both easier and quicker.
“It’s always worth checking you are on the deal best suited to your needs: have a look around at what is on offer.
“Switching is quick and easy to do and may save you money.”