The objective of sugar cane crushing mills is to maximize the extraction with minimum energy consumption, minimum maintenance costs and high operation reliability. For it, the drives must have capacity of reaction in extreme operation conditions, good dynamic performance under disturbances and high efficiency in the energy transformation. The extraction station has high possibilities of energy savings, since it approximately consumes 30% of the total energy of the plant. Currently, colombian sugar factories are carrying out a technological renovation, changing thermal or hydraulic drives by electrical drives, seeking to improve their efficiency, with high process monitoring and supervision and better dynamic performance. Process description of cane milling, performance characteristics between thermal and electrical drives as far as the equivalent inertia moments of mill, the dynamic performances, static efficiency and a comparative analysis of global power efficiency of milling process, which allows analyzing the investment return for replacement of thermal drives by electrical drives with induction motors, are presented.