Progress towards an all-renewable electricity supply

First of all, on the issue of the commercial competitiveness of photovoltaic (PV) electricity generation we would like to note that PV is already cutting the price of electricity on German and Italian grids. Figure 1a shows the cumulative installed PV capacity in Germany, Italy and the UK 2, 3. Figure 1b shows that the difference between the peak price of electricity and the base-load price on the German grid has fallen significantly 4, while PV installations in Germany have risen exponentially.