Abstract: Energy storage requirement is increasing day by day for all of us. Although the main demand comes in the form of electrical energy for the biomedical sector by utilizing thermal energy found via solar radiation. Phase-change materials (PCM) have been used in the energy storage device. In this work, we briefly discussed the melting, crystallization temperature, latent heat, and thermal stability of the synthesized sample, such as OM35-PCM highlighted. One of the promising materials is chosen based on the low melting enthalpy. Thermal analyses were performed to study its thermal conductivity and stability. OM35 with nanomaterial shows the linear response in thermal stability. This PCM becomes an attractive material to store the thermal energy and then further converted it into electrical energy. This work has a wide range of biomedical, solar power plant, and metrology applications. Differential scanning calorimetry (DSC) measurements were used to determine the melting point and enthalpy of fusion of OM35-PCM. Melting started peaked at 44.5 °C. The structural and morphological characteristics of nanocomposite PCM were investigated by X-ray diffraction (XRD) and a high-resolution transmission electron microscope (HRTEM). C Therm Trident system is used to analyze the thermal conductivity of nanocomposite OM35 PCM, which is seen to improve 0.4 W/mk. Nano-PCM of thermal conductivity is the best choice for low-temperature applications.