The Prince of Wales will open a whisky bottling plant at a 173-year-old distillery today.
Charles, known as the Duke of Rothesay in Scotland, will visit Glen Grant distillery at the start of a three-day trip to the north of Scotland.
He will also tour the plant in Speyside, Moray to see how the whisky is matured and bottled, while meeting some of the workers involved in building the factory.
Charles will also open a heat and power biomass plant in Speyside, designed to recycle waste from the whisky-making process.
The Helius Corde plant will process waste from nearby distilleries to generate 8.32 megawatts of electricity every year, enough to power 9,000 homes in the area, the operators said.
It will also produce an animal feed protein supplement as a by-product.
Charles will tour the plant and unveil a commemorative plaque to mark the opening.
In a similar event last year, Charles opened a biogas plant on his own Duchy of Cornwall estate in Dorset, which is said to be able to produce gas for around 56,000 homes.
At its launch, Charles said he hopes the model is copied around the country to provide a network of power plants serving communities.