From the available roof area, the total suitable PV area can be estimated. Two scenarios are considered: a PV Fraction=30% and a PV Fraction=20%. Where PV fraction is the percentage of occupation of suitable roof area by PV.

A fraction superior to 30% will be difficult to implement. The 20% option is taken as a conservative scenario in order to account for difficulties in the installation due to the wide type of devices that can be located on the roofs (such as the air handling units required by the new regulation [2,3,4]). The total area of PV (for the 172 schools) will range between 115 000 m2 and 172 000 m2, for a PV fraction of 20% and 30% respectively.