Research on energy consumption and bandwidth allocation is the basis for achieving the standard of service and fairness requirements for various traffic classes within the integrated optical-wireless access networks. The energy consumption issue is increasingly vital nowadays. The access segment of both optical and wireless networks is well-known for its domination over total network power consumption. In this research paper, the full power consumption and energy efficiency of integrated Ethernet Passive Optical Network (EPON) and two wireless technologies, namely Worldwide Interoperability for Microwave Access (WiMAX) and Long-Term Evolution (LTE) with a unique EPON-based semi-dynamic bandwidth allocation (SD-DBA), are evaluated. A semi-analytical power consumption model is proposed and applied within the simulation process for energy performance evaluation. Furthermore, various issues that will affect the energy performance like split ratio, Femtocell Base Station (FBS) range, analysis of broadcast elements, and modulation schemes are considered. The obtained results prove that the EPON-WiMAX with SD-DBA has better energy efficiency compared to EPON-LTE with SD-DBA that offers the best data rates with an increase of 12% in splitting ratio, 3.846% in FBS range and 8.6957% in broadcast factor.