Expenditure vs allowance: Gas transmission (RIIO-T1)


Javascript is required to render chart Expenditure vs allowance: Gas transmission (RIIO-T1).

Source: RIIO gas transmission annual report 2017-18.

Information correct as of: December 2018

This chart compares National Grid Gas Transmission’s total expenditure for their regulated business activities against their allowance for each year under the RIIO-T1 price control. 

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

Expenditure vs allowance: Gas transmission (RIIO-T1)
YearAllowance Expenditure

More information

Expenditure vs allowance: At-a-glance summary

Network companies are allowed to retain a part of any savings achieved, and the rest is passed on to consumers. 

Relevance and further information

This chart is an indicator of company RIIO-T1 financial performance against cost allowances so far.

The allowances reflect NGGT view. They are lower than anticipated at the start of the price control due to the forecast effect of reopener mechanisms.


Each year, network companies must report on their performance under the RIIO-T1 price control. Our review of their submissions and supporting information informs our annual publications on network company performance.

Date correct
December 2018
Policy area