Infrastructure provision the world over has undergone a series of profound changes in the manner of its financing and governance over the last 30 years or so. While the role of the state has diminished as a direct provider, builder and operator of infrastructure, its role as regulator and overseer has undergone substantial growth, increasing the regulatory burden on the state. While this transition has occurred relatively smoothly in developed country contexts, in developing countries the diffusion of the regulatory state has produced manifestly different forms of governance, stressing the regulatory capacity of existing and newly formed regulatory bodies. This paper explores the impact and manifestations of regulatory diffusion in the context of the Thai energy sector and the governance mechanisms responsible for electricity generation, transmission and distribution.