Superconducting magnetic energy storage (SMES) system is one of the commonly used technique by the end users to mitigate the voltage sag at their premises from the distribution system. The SMES is a superconductor coil wound on a nonmagnetic core. Contribution of refrigeration and AC loss in total SMES coil loss at different output power rating is investigated. Different Low Temperature Superconductivity (LTS) coil materials at operating temperature of 4oK are considered to select the best material with minimum coil loss. The results concluded that Nb–Ti material achieved minimum coil loss when compared with MgB2 and YBCO.