This Practice Note summarises the position on the ‘RIIO-2’ Great Britain energy network company price controls due to apply from 2021. It complements our suite of content on existing energy price control mechanisms and energy network companies and is updated as the RIIO-2 position evolves. It includes coverage of RIIO-2 for National Grid and for GB’s other electricity transmission, gas distribution and electricity distribution companies. It also considers the need for a bespoke price control regime for National Grid Electricity System Operator Limited (NGESO), as the GB electricity system operator (ESO), following National Grid’s split.