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: 5th Sep 2019
  • Charts and data
  • 1 Associated documents
This is the ET1 Price Control Financial Model for the Annual Iteration Process that is planned to take place by 30 November 2019.

  • Published: 5th Sep 2019
  • Decisions
  • 1 Associated documents
Direction to modify the ET1 Price Control Financial Model to amend the allocation of SPTL’s Innovation roll out mechanism expenditure to 100% load related capex expenditure.

  • Published: 5th Sep 2019
  • Charts and data
  • 1 Associated documents
This is the GT1 Price Contol Financial Model for the Annual Iteration Process that is planned to take place by 30 November 2019.

  • Published: 4th Sep 2019
  • Decisions
  • 1 Associated documents
Direction to modify the GT1 Price Control Financial Model by amending two labels

  • Published: 27th Aug 2019
  • Closed: 24th Sep 2019
  • Consultations and responses
  • 3 Associated documents
We are consulting on our initial views on the need case for St Fergus and Hatton proposed compressor investment.

  • Published: 6th Aug 2019
  • Open letters and correspondence
  • 3 Associated documents
Proposed modifications to the GT1 Price Control Financial Model to amend an incorrect label

  • Published: 6th Aug 2019
  • Open letters and correspondence
  • 3 Associated documents
Proposed modifications to the ET1 Price Control Financial Model to amend the allocation of SPTL’s Innovation roll out mechanism expenditure to 100% load related capex expenditure.

  • 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).

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