This paper presents an introductory survey on various methods of transmission and losses charge allocation. It starts with the explanation on the key components involved in deregulated power market. Starting with an overview, the basic elements of the market (structure, model and operation) are explained to give an introduction for better understanding of deregulation concept. Later, readers are presented with three most applied methods (traditional based, conventional tracing and computational intelligence) for losses charge allocation, categorized based on their principles and formulation techniques. The strengths and weaknesses of the three are critically reviewed and summarized. Researchers (or new readers interested in electricity deregulation) may decide a proper choice of method based on the findings presented here.