Cities currently account for about two-thirds of the world's annual energy consumption and about 70 percent of greenhouse gas (GHG) emissions. In the coming decades, urbanization and income growth in developing countries are expected to push cities' energy consumption and GHG emissions shares even higher, particularly where the majority of people remain underserved by basic infrastructure services and where city authorities are underresourced to shift current trajectories. These challenges are faced by many cities and millions of people in the East Asia and Pacific (EAP) Region, which is experiencing unprecedented rates of urbanization, as the region's urban population grows almost twice as fast as the world's urban population. Energizing Green Cities in Southeast Asia lays out a blueprint for transforming EAP cities to global engines of green growth by choosing energy efficient solutions to their infrastructure needs. It urges national and municipal governments to reform institutions, build capacity, and strengthen energy planning and governance in order to mainstream energy efficiency on a citywide scale and introduce low-carbon policies in fast-growing cities in the EAP Region which will define the Region's energy future and its GHG footprint. This book is based on case studies undertaken in three pilot cities - Cebu City (the Philippines), Da Nang (Vietnam), and Surabaya (Indonesia) - which illustrate the use of an energy efficiency platform - SUEEP (sustainable urban energy and emissions planning) - for the identification and prioritization of green investments across all major infrastructure sectors. It presents the SUEEP process as a framework for collaboration between municipal governments, stakeholders, private investors and financing institutions in achieving the green growth objectives at the city level. It also provides step-by-step guidance on the SUEEP framework in the form of a Guidebook to help a city develop its own energy and emissions plan and link its aspirations to actionable initiatives to improve energy efficiency and reduce emissions.