RIIO-1 annual performance reports

Here you can view all annual reports for the electricity and gas transmission and distribution network price controls for RIIO-1.

We additionally publish interactive charts and data on key monitoring themes on the Ofgem Data Portal.

For investor updates, see our Investor Relations section.

Publications and updates

  • Published: 11th Mar 2021
  • Reports and plans
  • 2 Associated documents
Report showing the performance of the electricity transmission network in 2019-20, the seventh year of the RIIO-ET1 price control.

  • Published: 11th Mar 2021
  • Reports and plans
  • 2 Associated documents
Report showing the performance of the gas distribution network in 2019-20, the seventh year of the RIIO-GD1 price control.

  • Published: 11th Mar 2021
  • Reports and plans
  • 1 Associated documents
This annex provides Ofgem's view of RIIO-1 network companies’ regulatory financial performance.

  • Published: 11th Mar 2021
  • Reports and plans
  • 2 Associated documents
2019-20 overview of National Grid Gas Transmission’s (NGGT) output delivery and financial performance for RIIO-GT1.

  • Published: 11th Mar 2021
  • Reports and plans
  • 2 Associated documents
RIIO-1 Electricity Distribution Annual Report 2019-20.

  • Published: 7th Feb 2020
  • Charts and data, Reports and plans
  • 2 Associated documents
Report showing the performance of the electricity transmission network companies in 2018-19, the fifth year of the current RIIO-ET1 price control.

  • Published: 7th Feb 2020
  • Reports and plans
  • 2 Associated documents
The report is a summary of Gas Distribution Networks performance against agreed outputs and incentives, innovation, and expenditure in cost categories to date and forecasts across the RIIO-GD1 period. It also has details on financial performance and the...

  • Published: 7th Feb 2020
  • Reports and plans
  • 2 Associated documents
This report summarises the performance of National Grid Gas Transmission (NGGT) during the sixth year of RIIO-1 which runs from 2013 to 2021.

  • Published: 7th Feb 2020
  • Reports and plans
  • 2 Associated documents
The report provides a summary of DNOs performance against agreed outputs and incentives, innovation, expenditure in cost categories to date and forecast across the RIIO-ED1 period, and provides details on financial performance and the impact electricity...

  • Published: 7th Feb 2020
  • Reports and plans
  • 1 Associated documents
This annex provides Ofgem’s view on RIIO-1 companies regulatory financial performance.

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