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

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Request for information – RIIO financial performance

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.

Network price controls and you: fast facts

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'.

RIIO electricity distribution annual report 2016-17

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.

RIIO electricity transmission annual report 2016-17

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.

RIIO gas transmission annual report 2016-17

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.

RIIO gas distribution annual report 2016-17

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.

Introduction of RIIO Accounts – further consultation on licence modification

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.

RIIO electricity transmission annual report 2015-16

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.

RIIO electricity distribution annual report 2015-16

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.

RIIO gas distribution annual report 2015-16

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.