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: 24th Feb 2017
  • Reports and plans
  • 3 Associated documents
Report showing the performance of National Grid Gas Transmission in 2015-16, the third year of the current RIIO-T1 price control.

  • Published: 29th Jun 2016
  • Decisions
  • 4 Associated documents
We are issuing a modified set of gas distribution regulatory instructions and guidance and reporting templates for 2015/16 annual reporting.

  • Published: 17th May 2016
  • Reports and plans
  • 2 Associated documents
This report summarises the findings from the second wave of our 2015 Consumer First Panel.

  • Published: 27th Apr 2016
  • Closed: 27th May 2016
  • Consultations and responses
  • 8 Associated documents
We are publishing a modified set of gas distribution regulatory instructions and guidance, and templates for 2015-16 annual reporting. We are providing instructions to enable the gas distribution network operators to complete the associated tables.

  • Published: 15th Dec 2015
  • Decisions
  • 1 Associated documents
On 28 August 2015, we published our open letter consultation on how we report on electricity distribution company performance. This document sets out our next steps for reporting on performance during RIIO-ED1.

  • Published: 28th Aug 2015
  • Closed: 9th Oct 2015
  • Consultations and responses
  • 26 Associated documents
We would like your feedback on how we and the Distribution Network Operators (DNOs) report on company performance during the current electricity distribution price control, RIIO-ED1.

  • Published: 19th Mar 2015
  • Reports and plans
  • 1 Associated documents
This is the first RIIO-GD1 gas distribution price control report. It reviews the progress companies have made in the first year 2014, and their forecast for the remainder of the eight year period until 2021.

  • Published: 19th Mar 2015
  • Reports and plans
  • 1 Associated documents
This is the first RIIO-T1 transmission price control report. It reviews the progress companies have made in the first year 2014, and their forecast for the remainder of the eight year period until 2021.

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