The authors regret that Figure 10 (left side image) was incorrectly produced. The corrected Figure is shown below. This inaccuracy has no bearing on the main results or conclusions of the publication. [Formula presented] Figure 10. Annual storage output of all technologies from 2015 to 2050 for the Regions (left) and Area (right) scenarios. Gas storage outputs do not include fossil natural gas or biomethane. The authors would like to apologise for any inconvenience caused.