Good Energy is to provide Blenheim Palace with 100% renewable power under the terms of a new deal.
The UNESCO World Heritage site says the move is part of an ongoing commitment to reduce its carbon footprint – it has also pledged to become a net generator of green energy within a decade.
The clean energy supplier will supply all demand to the site’s main buildings as well as its Pleasure Gardens, Park Farm, offices and on-site bottling plant.
The new agreement also includes the Windrush Industrial Estate, allowing other businesses based there to become more sustainable.
Blenheim Palace has also invested extensively in solar panels, biomass boilers and a hydroelectric turbine.
Randall Bowen, Sales and Commercial Director at Good Energy, said: “Blenheim is one of Britain’s most important historic sites and they have a longstanding commitment to the environment.
“Switching to a truly clean energy supplier is the natural choice for the business and the single most important thing the public can do to tackle climate change.”