Power-Line Communication (PLC) technology has received considerable attention over the last few years because of its connectivity advantages and its transmission capacity. However, to the best of our knowledge, there is a lack of simulation tools to evaluate the performance of PLC-based networks. In this paper, we present a new PLC simulation model based on the HomePlug AV standard (HPAV) for the ns-2 simulator. This model allows the study of the prioritized HPAV CSMA-based MAC access service including PLC channel properties with OFDM and Tone Map aspects. In this access service, all of the Priority Resolution Period (PRP) and the processes of framing and segmentation are considered, and a new MAC queue system is developed to ensure HPAV flow classification. Besides, the model design enables the simulation of a hybrid In-Home or low voltage Access network with a mix of wired and wireless technologies. The model functionalities and design are reported in this paper with a preliminary performance analysis.