Figure 2 indicates the CO2 emissions released during the PV module and BOS component production Numbers 1-3 represent the reference PV systems, 1MWp PV plant in Toledo, 40kWp BIPV facade and 29.3 kWp CdTe BLPV façade respectively. Table 4 summarises the total atmospheric emissions associated with the reference PV systems in Toledo and Newcastle upon Tyne