Alternative Storage Methods: Effective solar power storage can be achieved through various non-battery technologies, including thermal energy storage, pumped hydro storage, flywheel systems, compressed air energy storage, and supercapacitors. If you're considering using solar energy as a cleaner power source, and wish to store it, there are various options available. Giant bricks are not what most people think of when they hear the words “energy storage”, but they are a key element of a gravity-based system that could help the world manage an increasing dependence on renewable. Battery Storage Dominance with Rapid Cost Decline: Lithium-ion batteries have become the dominant energy storage technology, with costs falling over 85% since 2010 to $115/kWh in 2024.