Storage of CO2 in the Permian Leman Sandstone in the faulted horst block known as Viking A (UKCS block 49/12) in the Southern North Sea.Three well development of Viking A from a new unmanned platform supplied with CO2 from Barmston via a 20” 185 km pipeline.Final investment decision in 2027 and first injection in 2031.The site stores 130Mt of CO2, 5Mt/y for 26 years.Capital investment of £150 million (PV10, 2015), equating to £1.2 for each tonne stored.Capacity uncertainty is low, but can be reduced further through access to operator data (well rates and pressures)Heating is required to achieve the target injection rate in the initial very low reservoir pressure conditions