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: 2nd Oct 2018
  • Open letters and correspondence
  • 3 Associated documents
Request for network operators to submit to us their RIIO financial performance for the regulatory year 2017-18.

  • Published: 7th Mar 2018
  • Charts and data
  • 1 Associated documents
Learn how the energy networks fit together and get key facts on what they have delivered under the current network price controls, 'RIIO-1'.

  • Published: 19th Dec 2017
  • Reports and plans
  • 2 Associated documents
Report showing the performance of the electricity distribution companies in 2016-17, the second year of the current RIIO-ED1 price control.

  • Published: 19th Dec 2017
  • Reports and plans
  • 2 Associated documents
Report showing the performance of the electricity transmission network companies in 2016-17, the fourth year of the current RIIO-ET1 price control.

  • Published: 19th Dec 2017
  • Reports and plans
  • 2 Associated documents
Report showing the performance of the National Grid Gas Transmission (NGGT) in 2016-17, the fourth year of the current RIIO-T1 price control.

  • Published: 19th Dec 2017
  • Reports and plans
  • 2 Associated documents
Report showing the performance of the gas distribution network companies in 2016-17, the fourth year of the current RIIO-GD1 price control.

  • Published: 8th Nov 2017
  • Closed: 6th Dec 2017
  • Consultations and responses
  • 25 Associated documents
Our proposed modification to the licence that will allow the introduction of reporting of RIIO Accounts by network operators.

  • Published: 24th Feb 2017
  • Reports and plans
  • 2 Associated documents
This report shows the performance of the gas distribution companies in 2015/16, the third year of the RIIO-ET1 price control.

  • Published: 24th Feb 2017
  • Reports and plans
  • 3 Associated documents
Report showing the performance of the electricity distribution companies in 2015-16, the first year of the current RIIO-ED1 price control.

  • Published: 24th Feb 2017
  • Reports and plans
  • 3 Associated documents
Report showing the performance of the gas distribution companies in 2015/16, the third year of the RIIO-GD1 price control.

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