Energy generation is the process of producing electricity using fossil fuels, nuclear power, or renewable sources, while energy storage involves capturing the energy so that it can be used later. Without any form of energy storage, electricity generated during low-demand periods may go to waste. Storage technologies, such as batteries, pumped-hydro storage, and flywheels, help balance the grid by releasing energy during peak demand periods. The use of energy storage in combination with generation improves the power system’s reliability and stability, particularly with the rising contribution of renewable energy sources to the system.