At present, the global community is aware of the critical limit of the pollution of fossil fuels. Many countries including Thailand have explored alternative energy, one of which is solar energy. In particular, the use of solar for electricity generation is important to reduce imported energy because Thailand׳s primary commercial energy imports are 50%, approximately. The government has supported renewable energy through the long-term 22-yr alternative energy development plan 2015–2036 (AEDP 2015) which aims to boost the production of electricity using renewable energy, especially solar, to 6000 MW by the year 2036. They fund the price incentives of commercial power. The result is that the electricity authority of Thailand now has a production capacity of solar power-generation projects of 1558 MW, and 1261 MW of projects are under construction. This is 46.98% of the AEDP 2015 target. The major barriers of a solar system development are the high investment cost, the uncertain subsidy and lack of the thorough policy planning. Those obstructions are depended on the government strategy.