Energy firm EDF has told customers to expect an average rise in their bills of £693 a year.
It follows energy regulator Ofgem saying the energy price cap will rise by 54 per cent in April.
The Mirror reports that EDF will put its standard variable tariff (SVT) to an average of £1,971 a year based on typical use from April 1, 2022.
Scottish Power has said it will let its customers know how much their bills will rise by March 10.
Ofgem was forced to hike the energy price cap to a record £1,971 for a typical household on a standard tariff as gas prices soared to unprecedented highs - prompting a Government support package to be announced.
Philippe Commaret, managing director of customers at EDF, said: "We know that these changes, driven by global gas prices, will not be welcome news for customers, but we want to be fully transparent and give our customers as much notice as possible.
"We've never stopped offering our customers help and will continue to do so, although the scale of the global problem means we are constrained in how much we can do.
"It is good to see the Government acting now to take some of the sting from the forthcoming rise in April, although we know many customers will continue to struggle. We will work with the Government to implement the schemes in the best way possible for customers.
"The market also needs longer-term reform to ensure we don't end up here again, and Britain needs more of its own nuclear and renewable power generation and greater energy efficiency to reduce reliance on gas from other countries."
Chancellor Rishi Sunak has announced a £9 billion package, including a one-off repayable £200 discount and a £150 rebate on council tax bills, and £144 million to councils to support vulnerable households amid surging energy prices.
Labour leader Sir Keir Starmer told oris Johnson at Prime Minister's Questions to “stand up to this Chancellor” by telling him to support families “rather than loading them with debt” and take a look at the “bumper profits” of oil and gas giants.
As well as soaring energy bills, millions are to be affected by a rise in national insurance in April as well as rising inflation.
