For this study, we constructed the following three case scenarios based on the Taiwanese government's energy policy: a normal scenario, the 2008 "Sustainable Energy Policy Convention" scenario, and the 2011 "New Energy Policy" scenario. We then employed a long-term Generation Expansion Planning (GEP) optimization model to compare the three case scenarios' energy mix for power generation for the next (a) over circle 15 years to further explore their possible impact on the electricity sector. The results provide a reference for forming future energy policies and developing strategic responses. (C) 2013 Elsevier Ltd. All rights reserved.