Roof tiles on the Paul VI auditorium are being replaced by 2,700 solar panels in move that will save over 200 tonnes of carbon dioxide being emitted every 2 weeks.
Surplus power will be fed back into the grid earning the Vatican a good chunk of revenue when it’s not being used to cool or heat the 6,000 seater hall.
See video footage of the installation here.
Thanks to the BBC for this story.