In Thailand, types of PV systems, which are used for electrification are currently being used are categorized into; central PV power plants for rural areas and roof–top grid connected PV systems for urban households – are not economically viable based on current economic conditions. Solar home systems are comparable in cost with grid extension. The potential of these systems are significant as it has potential of about 10 MWp for solar home systems and 64 – 640 MWp for roof- top grid – connected PV systems. But any program to disseminate these systems in Thailand at present has to be subsidized. At present, the government is supporting the PV industry through the large scale programs being implemented by Provincial Electricity Authority (PEA), Department of