The regulator also confirmed that gas bills include 5 per cent VAT, while electricity is exempt from VAT between October 1, 2026 and March 31, 2027.
Ofgem warned that energy costs cannot be directly compared with previous periods because of the change in VAT.
The review comes as the Government faces pressure to tackle household energy costs and strengthen Britain’s energy security.
On Wednesday, Energy Secretary Miatta Fahnbulleh approved the Jackdaw gas field in the North Sea, with production expected to begin within weeks.
