Return on regulatory equity: Gas transmission (RIIO-T1)


Javascript is required to render chart Return on regulatory equity: Gas transmission (RIIO-T1).

Source: RIIO gas transmission annual report 2017-18.

Information correct as of: December 2018

This chart is an indicator of financial performance. It shows our estimates of National Grid Gas Transmission’s return on regulatory equity (RoRE). It is our current view of an eight-year average RoRE over the RIIO-T1 period.

We update this chart on an annual basis. Click the ‘more information’ tab above for a summary of the latest trends, details of how to interpret the figures and for information on methodology.

Policy Areas:

  • Gas - transmission

Data Table

Return on regulatory equity: Gas transmission (RIIO-T1)
NetworkCurrent eight-year view
National Grid Gas Transmission7%

More information

Return on regulatory equity: At-a-glance summary

  • National Grid Gas Transmission’s RoRE is 7%.

Relevance and further information

  • RoRE helps us monitor the financial performance of network companies under the price control.
  • RoRE should be compared to the cost of equity allowed at the start of the price control. For National Grid Gas Transmission this was 6.8%. 
  • National Grid Gas Transmission’s numbers include the impact of the Mid-Period Review.


  • Our RoRE calculation is based on a mix of the first three years’ performance, company forecasts and simple averages.
  • There are a number of factors not reflected in our RoRE calculations which may impact the return realised by shareholders. The largest being potential clawbacks for non-delivery of outputs.
  • The calculation assumes all outputs will be delivered.
  • Returns may not equal the actual returns seen by shareholders.
Date correct
December 2018
Policy area