VIS has been commissioned by NARUC (assignment funded by the United States Department of State) to support the Thailand Office of the Energy Regulatory Commission (ERC) in overseeing the implementation of an open access regime in Thailand. The study will provide suggested revisions to the Third Party Access (TPA) Framework drafted by the ERC and a proposed pricing mechanism for wheeling charges. The study will assist the ERC in identifying crucial considerations governing non-discriminatory third-party access to electricity transmission and distribution networks, thus creating robust, open and effective competition in electricity sector markets.