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.”
More top news
Police have released footage of the moment a 12 year-old girl was knocked down by a hit-and-run driver on a zebra crossing in Birmingham.
East Midlands Airport is preparing for its busiest day as part of the Christmas getaway.
Genelle Aldred brings you the latest weekend weather for the East & West Midlands.