Question to the Department for Energy Security & Net Zero:

To ask the Secretary of State for Energy Security and Net Zero, what assessment his Department has made of the impact of voltage reduction technologies installed in homes on household energy bills.

The effect of voltage reduction on consumer bills varies between appliances. For appliances that are power controlled (including most electronics, LED lighting, EV chargers and heat pumps), lowering the voltage does not reduce energy consumption and reduce consumer bills. For appliances that are resistive (electric heaters, filament lights), the devices work less well at lower voltages and the effect on consumer bills depends on the consumer’s response to this reduction in performance (e.g. by switching on more heating or lighting).