The existing "unfair and regressive" standing charge structure should be replaced with a sliding scale block tariff model that is more closely based on how much energy a household uses, MPs have urged. In its first report since being set up during the summer, the House of Commons energy security and net zero (ESNZ) committee says the government, Ofgem and suppliers must take "urgent action" to help cash-strapped households as bills remain much higher than pre-crisis levels in the run-up to the winter.