Liz Truss will travel to the Scottish Highlands to meet the Queen on Tuesday at Balmoral Castle, where she will be asked to form a government and become prime minister.
The historic audience will be the first time the 96-year-old monarch, who has faced ongoing mobility issues, has carried out the key duty at her retreat in Aberdeenshire rather than at Buckingham Palace.
Ms. Truss and Boris Johnson will travel to Balmoral on Tuesday to meet the Queen, where Mr. Johnson will resign and Ms. Truss will be appointed as prime minister.
She is flying 500 miles each way to Balmoral to be handed the keys to No10 by the monarch before addressing the nation from Downing Street with a pledge to slash household bills.
Her emergency package to tackle the cost of living crisis is expected to include freezing energy bills for homes and businesses until January next year at least - and possibly until 2024.
At the moment, household energy bills are capped at £1,971 - rising to £3,549 in October. The price cap is due to rise again in January when bills are forecast to pass £5,000.
But under the new PM's price freeze plan, the government would directly intervene in the wholesale energy market, subsidizing the cost of gas bought by electricity generators and suppliers.