Energy prices will rise for millions of people across the UK in April, at a time when finances are squeezed.
Regulator Ofgem said the price cap for default domestic energy deals would be raised to cover suppliers' extra costs.
The typical gas and electricity customer is likely to see their bill go up by £96 to £1,138 a year.
Charities say the timing is a "double whammy", coming at a time when the government's Covid-related support schemes are due to be wound down.
Ofgem said rising wholesale costs were behind the increase, adding that the existence of the price cap meant households saved £100 a year, and they could also switch to a better deal.
Jonathan Brearley, chief executive of the regulator, said: "Energy bill increases are never welcome, especially as many households are struggling with the impact of the pandemic. We have carefully scrutinised these changes to ensure that customers only pay a fair price for their energy.
"As the UK still faces challenges around Covid-19, during this exceptional time I expect suppliers to set their prices competitively, treat all customers fairly and ensure that any household in financial distress is given access to the support they need."
He said a rise in spring, when less energy was used, was better than waiting until the autumn.
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