Two billion seeds stored at Kew's Millenium Seed Bank in West Sussex are to be kept cool by solar panels.
A total of 270 panels have been installed on the roof of the facility at Wakehurst Place in Ardingly, near Haywards Heath.
Tomorrow, the longest day of the year, they are expected to produce up to 400 kWh of electricity.
More top news
The first female paramotorist has made it across the English Channel - flying the route of migratory swans from Russia to Kent
Monday night's weather for the west of the region
Monday night's weather for the east of the region