We especially take this opportunity to thank the members of the Working Group, the Economic Research Institute for ASEAN and East Asia (ERIA), the International Affairs Division of the Agency for Natural Resources and Energy (ANRE) of the Ministry of Economy, Trade and Industry (METI) of Japan, and IEEJ’s Energy Outlook Modelling Team. [...] Introduction Responding to the Cebu Declaration on East Asia Energy Security on 15 January 2007 announced by the leaders of the 16 countries of the East Asia Summit (EAS), the EAS Energy Cooperation Task Force (ECTF) was established and one of the agreed areas for cooperation was energy efficiency and conservation (EEC). [...] The 2013 study was updated again to undertake the following: Reflect the energy efficiency goals and actions plans submitted by the energy ministers during the 8th EAS Energy Minister’s Meeting (EMM) held in Vientiane, Lao PDR on 24 September 2014 in the latest energy outlook until 2035; and Determine the impacts of various energy policies aimed at reducing energy demand and CO2 emissions as f. [...] This is due to the assumed resumption of nuclear power generation in Japan, the expansion of power generation capacity in China and India, and the introduction of this energy source in Viet Nam. [...] The nuclear share (3.4 percent in 2012) is forecast to increase to 10.5 percent in 2035, in the assumption that nuclear power plants in Japan will resume operation, and due to an increase in generating capacities in China and the introduction of nuclear energy in Viet Nam.