Risk removed from the network: Gas distribution (RIIO-GD1)


Javascript is required to render chart Risk removed from the network: Gas distribution (RIIO-GD1).

Source: RIIO gas distribution annual report 2017-18.

Information correct as of: March 2019

This chart is an indicator of network safety. Due to their nature, gas networks pose a safety risk. We set targets for gas distribution network owners to reduce the safety risk on their networks. The chart shows the level of safety risk network owners have removed by replacing or abandoning iron gas mains over the three completed years of the RIIO-GD1 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 - distribution

Data Table

Risk removed from the network: Gas distribution (RIIO-GD1)
Proportionate risk reductionActual Risk reduction

More information

At-a-glance summary

In 2017-18, five out of the eight networks have now exceeded their total GD1 primary output target of risk removed. The remaining three networks have yet to achieve their total output target but have still removed more risk than expected at this point in the price control.

Relevance and further information

Gas distribution companies undertake long-term programme of replacing risky iron mains on their networks as mandated by the Health and Safety Executive. Under RIIO-GD1, the ‘iron mains risk reduction’ primary output target sets the level of iron mains risk that GDNs must remove from their networks.


Each year, network companies must report on their performance under the RIIO-GD1 price control. Our review of their submissions and supporting information informs our annual publications on network company performance.

Date correct
March 2019
Policy area