Windsor Castle will be fitted with solar panels for the first time, as part of a wider sustainability push on royal residences.

According to annual accounts for the Royal Household, solar panels will be installed on part of the Windsor Castle estate known as the Lord Chamberlain's Upper Store. These will replace the existing lead roof, with plans to add more panels in the future.

These new environmental initiatives are "driven by a determination to place sustainability at the heart of our operations and inspired by His Majesty's leadership in this sphere," says Sir Michael Stevens, Keeper of the Privy Purse.

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For decades the natural world has been close to the heart of King Charles III, who prides himself on his eco-friendly properties and climate change campaigns. Other eco changes include switching to a fleet of electric cars and changing the gas lanterns at Buckingham Palace to improve their energy efficiency.

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Prince Charles planting a tree

However, despite these eco changes, the royal household will also receive two new helicopters over the coming year as they are a "key component" in enabling the King to carry out his royal duties. The report also flagged a 3% decrease in natural gas and heating emissions across all estates, but greenhouse gas emissions did increase from the previous year.

Buckingham Palace is currently undertaking a £369 million renovation project. Now in its seventh year, the project aims to protect the historic building from the risk of fire or flood, and to ensure the Palace is "fit for purpose and to preserve it for future generations". The works are also to make the building as eco-friendly as possible.

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Sir Micheal added: "Behind the scenes, the work of the Royal Household continued apace, even throughout the latter course of the financial year, with His Majesty still performing his full state duties, Her Majesty taking on a greater share of public engagements, and their support teams adapting swiftly to the changing circumstances."

For the full annual report, visit royal.uk.

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Lisa Joyner
Deputy Daily Editor, Country Living and House Beautiful

 Lisa Joyner is the Deputy Daily Editor at House Beautiful UK and Country Living UK, where she's busy writing about home and interiors, gardening, dog breeds, pets, health and wellbeing, countryside news, small space inspiration, and the hottest properties on the market. Previously, she has written for Conde Nast Traveller, House & Garden and Marie Claire magazine. Lisa studied at University For The Creative Arts, where she completed a BA in Fashion Journalism.