Under the regional technical assistance TA 8330-REG “Harmonizing the Greater Mekong Subregion (GMS) Power Systems to Facilitate Regional Power Trade, international and national consultants have been engaged to support GMS Regional Power Trade Coordination Committee (RPTCC), the Working Group on Performance Standards and Grid Codes (WGPG), and the Working Group on Regulatory Issues (WGPG) to conduct feasibility assessments of priority regional power projects to be commissioned from 2022-2030. The assessments include generation and transmission infrastructure for power trade among Greater Mekong Subregion (GMS) countries (Lao PDR, Viet Nam, Myanmar, Thailand, Cambodia and People’s Republic of China [PRC]). The assessments in PRC is limited. The scope includes due diligence of four regional power projects to be commissioned from 2022-2030 for GMS regional power trade which have been proposed by the GMS countries. Proposed projects are provided in Table 2 for reference, however the list of projects will be updated depending on the priorities and updated power development plans which will be confirmed at the award of contract. The country of power export and power import countries will not be changed. Key due diligence includes but is not limited to the assessments of: (i) technical viability; (ii) initial design; (iii) Economic and Financial viability assessments; (iv) preliminary environmental impacts; (v) preliminary social and land acquisition requirements; and (vi) ongoing power trade among the GMS, identify the barriers in technical and regulatory aspects, and recommend necessary developments to enable grid to grid operation.