The requirement of electricity and photovoltaics are defined as follows. The data for solar irradiation for Zurich are recovered from . The surface required is set to provide globally sufficient electricity or H2 to cover the demand from cars to drive 10 9 km/year (process design section). This distance is also considered equivalent to 280 • 10 6 km/year of a H2 fuelled bus fleet. In the case study the surface is selected to completely convert the CO2 originated from the biogas upgrading process of the selected biogas plant to transportable products. CO2 is stored in tanks of 200 m 3 volume, which cost 150'000 € each. The installation cost of PV panels is set to 900 €/kW peak . The main parameters for the techno-economic analysis are summarised in table . The main performance indicators are defined as follows.