Question to the Department for Business, Energy and Industrial Strategy:

To ask the Secretary of State for Business, Energy and Industrial Strategy, what assessment he has made on the cost effectiveness of installing three-phase electricity supplies in (a) new and (b) existing homes.

Electricity connections and upgrades for new and existing homes are a matter for distribution network operators (DNOs) overseen by the independent regulator, Ofgem. Under the Distribution Connection and Use of System Agreement, DNOs are required to offer customers the most efficient solution to meet their requirements. In doing so, DNOs assess whether a single or three-phase supply would be appropriate.