Shifting bill costs from standing charges to unit rates could deter households from switching to electric heat and vehicles, with knock on consequences for the transition to net zero, Ovo has warned. In one of a string of concerns raised by the industry with the House of Commons energy security and net zero (ESNZ) committee about the unintended consequences of reforms to standing charges, the supplier said increases in unit rates will have a "disproportionate impact" on households using electric heating.