Long-duration energy storage will be a crucial enabler in transitioning to a cleaner energy system. Replacing fossil fuels with renewables will result in greater variations in energy supply and increase the need for storage to meet demand peaks. Long-duration energy storage can match this flexibility in the electricity supply while providing affordable, reliable, and resilient clean energy solutions. Solutions for long energy storage go beyond lithium batteries to thermal energy storage, flow and redox batteries, gravity-based solutions, thermochemical storage, metal-air batteries and much more. This landscape is reproduced from the work of the LDES (Long Duration Energy Storage) Council and enhanced by Dealroom.