Domestic gas and electricity bills are a complicated mix of charges for energy policy, costs to run the network, as well as the price of gas and electricity to run a home.
In November’s Budget, Chancellor Rachel Reeves announced changes to the first of these – policy costs.
She said the typical annual household energy bill would fall by £150, by scrapping the Energy Company Obligation (Eco) scheme introduced by the Conservatives in government, and also moving some charges onto general taxation.
However, the cost of maintaining and strengthening energy networks – including power lines, cables and gas pipes – is rising.
So, analysts at the consultancy Cornwall Insight have forecast that a household using a typical amount of gas and electricity will see their annual bill drop by £117, to £1,641 in April.
A similar fall was seen last summer, but prices have risen since then. The announcement for bills in April will be made at 07:00 GMT on Wednesday.