The steep bill comes after the Government lifted the price cap limit that energy suppliers can charge for their default tariffs. Now analysts predict the 54 percent rise announced by Ofgem last week could add more than £2million to the energy bill of heating and lighting royal residences. The cost of heating royal buildings is now expected to surge to more than £4 million.
The energy needed for electricity, heating and lighting in Buckingham Palace alone is estimated at £2,039,985 per year.
The palace has 775 rooms and covers 828,000 sq ft.
Windsor Castle costs £1,192,455 across its 100 rooms.
The castle, which was originally built in the 11th century after the Norman invasion of England by William the Conqueror, covers a total of 484,000 sq ft.
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Highgrove House, which is the private residence of Prince Charles and Camilla, is set to cost £70,170.
Last year plans were announced to make Balmoral Castle more sustainable.
The royal residence won permission for a 2MW hydroelectric turbine to generate £650,000 worth of power.
The surplus energy would then be sent to the National Grid.
Speaking to the Daily Mirror, Tashema Jackson, energy expert at energyhelpline.com said: “No one is going to be able to avoid the astronomical hike in energy costs.
“The rise in prices will come in on 1st April.
“And unsurprisingly the energy bills for these big and historic buildings are going to be considerable.”
The news comes after energy regulator Ofgem announced on Thursday that the energy cap will rise by 54 percent.