Up to 30% of households could be eligible for a social tariff if it was put in place, Jonathan Brearley has estimated. Giving evidence to the House of Commons select committee on energy security and net zero, the Ofgem chief executive was pressed to provide a ballpark figure on the number of Brits that a social tariff would cover. Neil Kenward, Ofgem’s director for strategy, research and net zero, also told the committee that the regulator will be conducting a “fresh review” of the operating cost element of bill-payers’ standing charges.