This study evaluates four power plant options in Thailand to suggest whether the country should adopt nuclear power plants. It includes a scenario that nuclear power plants are forced to be shut because of natural disaster like what happened at Fukushima Daiishi nuclear power plant in Japan. The results found that, in terms of net present value both in duration of 30 and 50 years, nuclear power plants is the best choice under certainty of no severe natural disaster that would interrupt the operation of the power plants. With a possible big natural disaster, it has proven that Thailand should not rely on only nuclear power plants; the country should balance the sources of electrical supplies to ensure that people will not suffer from severe electrical shortage.