Which? executive director Richard Lloyd said:
“It is the right decision to refer the energy market to a full scale investigation and a hugely important step towards restoring trust in an industry that has lost the confidence of its own customers.
“This investigation must work quickly to expose what is really happening in the energy market and confirm where competition is lacking. It is make or break time for the energy suppliers, who should not wait to be forced into action but instead start now to put customers first, keep costs as low as possible and trade transparently.
“Which? will work to ensure the voice of consumers is heard throughout the investigation, and we will continue to argue for radical reforms that ensure the outcome is a market that works competitively for everyone and especially for the millions struggling with spiralling bills.”