The data released by Energy UK shows that more than a quarter chose to move away from the larger suppliers to smaller challenger companies.
British Gas, Bulb, EDF Energy, E.ON, Octopus Energy, OVO and Scottish Power are the most prominent suppliers on the market under Ofgem's revised definition which classifies all suppliers with a market share of 5% or above as a larger supplier.
Increased competition and improving standards among smaller suppliers saw challenger companies easily beating the larger suppliers in the recently released Which? Survey.
Poor customer service, inaccurate billing and bad complaints handling were the main causes of their low positions. Npower came the bottom of the pile with a customer satisfaction score of just 54%, while British Gas, Scottish Power, Eon and EDF made up the rest of the worst.
The fall in switching numbers could reverse in the coming months as Ofgem prepares to announce the latest energy price cap that will take effect from April 1st.
The regulator is expected to raise the price cap by £66 in an attempt to support energy suppliers who are being impacted by rising bad debts.
Rising wholesale energy prices have also played its part on spurring expectations of a price cap rise.
Currently, the price cap stands at £1,042. The rise will see the 11 million households who have never switched suppliers and who've stayed on standard variable tariffs be hit with higher energy bills.
The price cap change is an excellent opportunity for energy suppliers to attract new customers, especially if their tariffs are cheaper.
Ofgem will reveal just how much of an increase will be made to the price cap early next month.
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