Decision on the RIIO-1 close out methodologies for the Electricity System Operator
The RIIO-1 price control for the Electricity System Operator (ESO) ran from 1 April 2013 until 31 March 2021. Within this framework, there were several cost areas which, due to their uncertain nature, could only be finalised once all costs are known. As a result, at the end of the RIIO-1 price control, some elements need to be settled (or subject to “close out”) now that all the relevant information is available.
This decision sets out the final RIIO-1 close out methodologies for the ESO. These methodologies will be implemented through the November 2022 Annual Iteration Process of the ESO RIIO-2 Price Control Financial Model.