This publication presents the integration of a Strategic Environmental Assessment (SEA) in the revised Power Development Plan VII of Viet Nam. It demonstrates how incorporating an SEA into the planning process will produce plans that are based on a more thorough understanding of their implications for the economy, society, and environment of the country. Viet Nam’s revised Power Development Plan VII is a model of good practice in integrating an SEA in the preparation of a strategic plan for the power sector of other countries, particularly in the Greater Mekong Subregion.