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: 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: 15th Dec 2017
  • Decisions
  • 1 Associated documents
Decision on the RIIO-T1 Environmental Discretionary Reward for the 2016/17 scheme year

  • Published: 30th Nov 2017
  • Decisions
  • 2 Associated documents
Completion of Ofgem’s 2017 reasonableness review and revision of pension allowances.

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

  • Published: 13th Oct 2017
  • Closed: 27th Oct 2017
  • Consultations and responses
  • 10 Associated documents
Notice of our provisional revised pension allowance values and 2017 reasonableness review of RIIO network operators’ pension deficits.

  • Published: 19th Sep 2017
  • Decisions
  • 2 Associated documents
Decision to amend algebraic errors in Special Condition 6F of Scottish Hydro Electric Transmission plc’s electricity transmission licence.

  • Published: 4th Aug 2017
  • Decisions
  • 2 Associated documents
Notice to decision relating to treatment of Fleetwood capacity obligation and price control funding.

  • Published: 28th Jul 2017
  • Decisions
  • 5 Associated documents
Our Decision following review and consultation to modify the Pension Regulatory Instructions and Guidance.

  • Published: 4th Jul 2017
  • Closed: 1st Aug 2017
  • Consultations and responses
  • 9 Associated documents
We are consulting on changes to PCFMs accounting for two recent decisions (National Grid allowance deferrals and Cadent refund for medium pressure iron mains

  • Published: 26th Jun 2017
  • Closed: 24th Jul 2017
  • Consultations and responses
  • 12 Associated documents
In our recent Decision on our policy for funding Pension Scheme Established Deficits we said we would modify the Pension Regulatory Instructions and Guidance.

Pages