The fast growing of advanced digital technologies and the vast concern on the global warming phenomenon has led to the realization of a need for the development of “Smart Grid” throughout the globe. However there are fundamental distinctions among countries regarding the maturity of the electricity supply industry (ESI) structure, economic/political priorities and the vision of the government in this development. This paper therefore reviews major factors that involve in the development of a smart grid from selected countries, which are sensitive to these realities. Consequently, the outlook is different from the prevailing tendency to simply transplant experiences from elsewhere. The core issue that is identified in this paper is the approach to the nation’s policy. Thailand, since it is of medium size and reform oriented, is used as a main reference point. It is envisaged that the case studies discussed in this paper be useful for other countries where policy issue has become a key success of the development.