We are working actively to improve the representation of storage in energy system models. Exisiting models often have a storage component to them, but this is often assumed to represent all aspects of the storage operation and contribution to the system even for long term modelling. This project will investigate the assumptions and model structures required to effectively model storage in long term energy models. This will allow better representation of common storage technologies such as Lithium ion batteries, pumped hydropower and power to gas (P2G) for hydrogen production.