The current growth rate of solar PV for electricity production exceeds all other renewable energy sources. The installed capacity worldwide is 320 GW (Gigawatt) and is forecast to double every two years, i.e. reach 640 GW by 2018 and 1,280 GW by 2020 to become the dominant clean energy source employing possibly 10 million. Each year Ireland gets an average of 1000 hours of sunshine, comparable with England, Wales and Northern Europe where solar PV has seen strong growth in recent years. Ireland’s installed capacity is minuscule in comparison but this is expected to change in the near term.