RIIO-T1 network price control

In March 2008, we launched a comprehensive review of the RPI-X framework we used to regulate gas and electricity networks. This review was known as the RPI-X@20 review.

Our recommendation from this review was the need to use a new regulatory framework built on elements of the previous approach but with important new elements. It is known as the 'RIIO model' .

'RIIO' stands for: Revenue = Incentives+Innovation+Outputs

It builds on the success of the previous RPI-X regime, but better meets the investment and innovation challenge. It does this by placing much more emphasis on incentives to drive the innovation needed to deliver a sustainable energy network that offers value for money to existing and future consumers. The RIIO framework is designed to promote smarter gas and electricity networks for a low carbon future.

RIIO-T1 is the first transmission price control review to reflect the RIIO regulatory framework.

RIIO-T1 sets out what the transmission network companies are expected to deliver and details of the regulatory framework that supports both effective and efficient delivery for energy consumers over the eight years from 2013 – 2021.  

You can read our RIIO-T1 documentation below.

Publications and updates

  • Published: 6th Jun 2019
  • Guidance
  • 1 Associated documents
This guidance document aims to provide greater transparency and certainty to Ofgem and the ERs on NGGT’s proposed approach to compressor emissions compliance over the RIIO-2 price control period, and in the subsequent price control periods.

  • Published: 7th May 2019
  • Decisions
  • 8 Associated documents
Direction relating to a modified set of gas transmission regulatory instructions and guidance (RIGs) and reporting templates for 2018-19 annual reporting.

  • Published: 30th Apr 2019
  • Decisions
  • 5 Associated documents
This direction introduces Regulatory Financial Performance Reporting (RFPR ) as part of the Electricity Distribution and Transmission Regulatory Instructions and Guidance (RIGs).

  • Published: 22nd Nov 2018
  • Decisions
  • 1 Associated documents
This is the ET1 PCFM for the AIP that is planned to take place by the 30 November 2018.

  • Published: 16th Nov 2018
  • Decisions
  • 1 Associated documents
See the decision on the RIIO-T1 Environmental Discretionary Reward for the 2017-18 scheme year.

  • Published: 5th Nov 2018
  • Closed: 3rd Dec 2018
  • Consultations and responses
  • 14 Associated documents
This consultation sets out proposed changes to the Stakeholder Engagement Incentive Guidance and Stakeholder Engagement and Consumer Vulnerability Incentive Guidance.

  • Published: 26th Oct 2018
  • Decisions
  • 1 Associated documents
This is the GT1 PCFM for the AIP that is planned to take place by the 30 November 2018.

  • Published: 26th Sep 2018
  • Decisions
  • 2 Associated documents
Decision on modifications to the RIIO-ET1 PCFM to implement the appropriate level of funding for NGET related to the Electricity System Operator separation.

  • Published: 26th Sep 2018
  • Charts and data
  • 1 Associated documents
RIIO-ET1 PCFM published following the decision on modifications to account for Electricity System Operator (ESO) separation.

  • Published: 30th Aug 2018
  • Charts and data
  • 1 Associated documents
RIIO-GT1 PCFM published following the decision on modifications to implement PARCA and Fleetwood. Note that this is not the final model for use in AIP 2018.

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