This paper investigates the energy analysis process of Building-Integrated Photovoltaics (BIPV) buildings using a case study and explores its accuracy. Building Information Modeling (BIM) software tools are used for modeling BIPV buildings and carrying out energy analysis. The case study simulates electricity production from four BIPV panel systems of the BIPV Experiment Demonstration House located in the Industrial Technology Research Institute (ITRI), Hsinchu, Taiwan, and compares the simulated results with three-year measured data. It is shown that a reasonably good estimate of the electricity production of a BIPV building at the building design stage was obtained in the case study. (C) 2016 Elsevier B.V. All rights reserved.