Energy storage companies develop and utilize technology to harvest energy for later use. These companies mainly capture spare energy, the energy source being either renewable such as solar and wind or non-renewable like traditional power units, and then release it when required. The technological characteristics of these companies also usually include high energy discharge lithium-ion battery systems, flow batteries having long operating times per discharge with this kind convenience to recharge your set each day, all non polluting of course. These systems are also coupled with advanced control and power management software that optimize performance. Storage of energy is applied in various fields, such as residential, commercial and network configuration. It thus enhances the reliability and stability of power supply systems by integrating more renewable energy sources into them.