The global shift towards renewable energy sources like solar and wind power is driving the need for robust energy storage solutions to maintain grid stability. Energy storage technologies such as batteries, thermal storage, mechanical storage, pumped hydro, and hydrogen are being explored extensively to address the challenges of intermittency and ensure grid reliability during the clean energy transition. The variability of renewable energy sources presents challenges for energy security and grid stability, highlighting the importance of energy storage systems. While lithium-ion batteries are currently dominant, researchers are investigating alternative battery technologies like proton batteries. Thermal storage, mechanical storage, and pumped hydro are also key players in the energy storage landscape. Hydrogen, with its capability for long-term storage and electricity generation, emerges as a promising energy storage solution. Innovations in energy storage, including green hydrogen schemes, are crucial for enabling the widespread adoption of renewables and managing the variability in energy supply. The energy storage sector is poised to become a trillion-dollar business, driving research and development into diverse storage solutions to support grid stability in the era of renewable energy dominance and electric vehicle expansion.