Construction of the Star of Caledonia sculpture at Gretna Green will begin in March with CWP Energy contributing around £6m of the £12m project cost.
The 33-metre illuminated landmark will be the largest sculpture in Scotland and is designed by Cecil Balmond OBE.
According to the Star of Caledonia Trust, the LED-lit structure will be powered by renewable energy.
The biodiverse 39-acre site will feature a visitor hub, landscaped grounds and a viewing platform.
It is expected to open in spring 2027 and attract over 200,000 visitors annually, with all revenue reinvested through a community interest company to fund arts, education and community initiatives.
CWP Energy and the trust will continue engagement with local communities and stakeholders to support delivery.
Rod Wood MBE, managing director of CWP Energy, said: “This is going to be a spectacle that embodies Scotland’s legacy of innovation and its commitment to green energy.”
He added: “It is more than just a sculpture, it’s a national statement.”
Trust chair Lucy Houston said: “This partnership represents a huge step forward for the project and is a testament to the enduring support from our local community, Dumfries and Galloway Council, and elected councillors.”
Alan Walker, treasurer and former chair of the James Clerk Maxwell Foundation, said: “The Star of Caledonia captures the very essence of his discoveries: light, energy, and innovation.”