EDF and the consumer group Which? are calling for suppliers to offer a national unit rate for electricity and gas for each tariff, scrapping regional variation in prices and standing charges.
EDF said the move to “petrol forecourt-style pricing” would mean “consumers would be left in no doubt as to which suppliers were offering the best deals”.
But other major energy suppliers came out against EDF’s proposal, warning it could cost the majority of users £100 extra and could benefit second home owners at the expense of vulnerable families.
Ofgem has already pushed forward reforms, backed by ministers, to try to simplify the energy market by limiting the number of tariffs a supplier can offer to four, each consisting of a standing charge and a unit rate. Previously suppliers had often used two-tier rates.
Ofgem said it had already looked at the single unit price option but it was “not as simple as it sounds”.