The pope is on a drive to make the Vatican Europe's most energy efficient state.
Around 2,000 square metres of the Paul VI hall are being covered with photovoltaic panels, while the another 3000 square metres will be used as a screen to increase the amount of captured energy.
According to Mauro Villarini, an engineer who works for Vatican State's technical services, " The objective of our project is, in sum, to create an energy process from which, with the production of clean energy and its intelligent management, it is possible to supply in the first place these properties and, in the future, also the means of transport, making mobility sustainable from the environmental point of view".
" The challenge for Vatican City State to be the first in Europe to comply with European objectives, which foresee for 2020, obtaining at least 20% of consumed energy from renewable sources."
Villarini expects the solar panels to be functioning by the end of this year.