Network connections by transmission owners: Electricity transmission (RIIO-T1)


Source: RIIO electricity transmission annual report 2017-18.

Information correct as of: March 2019

This chart is an indicator of company performance on network connections delivered on time over the completed years of 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:

  • Electricity - transmission

Data Table

Network connections by transmission owners: Electricity transmission (RIIO-T1)
Year 1 not on timeYear 1 on timeYear 2 not on timeYear 2 on timeYear 3 not on timeYear 3 on timeYear 4 not on timeYear 4 on timeYear 5 not on timeYear 5 on time
National Grid Electricity Transmission01390235028001870189
Scottish Power Transmission2502860116063159
Scottish Hydro Electricity Transmission047098088059049

More information

Network connections by transmission owners: At-a-glance summary

In 2017/18 a total of 189 applications were submitted from parties seeking to connect to the electricity transmission network, all of which were delivered on time.

Relevance and further information

Electricity transmission owners are required to deliver timely and effective connections to the network.

Under the price control, we expect companies to provide a good service for customers wanting to connect to the network.


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
March 2019
Policy area