This paper by Jacobs' Global Technical Lead for Hydropower, Simon Bailey, focuses on the need for developing further long-term energy storage in the U.K. to increase the use of surplus renewables generation, helping the country to reach its objective of achieving net-zero emissions by 2050. It also investigates the current market barriers that are preventing further long-term storage developments from being implemented in the U.K. at present and suggests alternative market mechanisms that could be introduced to encourage potential developers to enter the market.