The Chatsworth Renewable Energy Centre will be officially opened today.
Its low carbon heat and power system will feed 97% of electricity and 72% of heating to the 300-room house, garden, shops and restaurants.
The centre has been funded by an attic sale of items in 2010. It has cost more than £2.5 million to build.
The Duke of Devonshire, said: “By using funds raised from the attic sale the past is playing its part in providing Chatsworth with a sustainable future by helping reduce our carbon footprint and supporting the on-going maintenance of our woodlands and ecosystem.”
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After a cloudy morning with occasional rain drier and brighter conditions will develop by early afternoon with sunny spells.
Staying windy and often rather cloudy, with patchy rain at times. It should gradually become brighter later.
A wet and windy evening with heavy, persistent rain spreading eastwards, clearing through the early hours.