Our RIIO-T1 performance

We publish a summary of our performance so that we can explain how we have performed to our customers, stakeholders and end consumers. We hope that you find it useful and we welcome your feedback on how we can improve our report in the future.

Performance summary documents

You can read or download our performance summary documents by clicking on the relevant link below. Our final T1 report will be published in September 2021.

2020/2021

2019/2020

2018/2019

2017/2018

2016/2017

2015/2016

2014/2015

2013/2014

This continues to be our number one priority. We are proud to report that our injury frequency rate has remained low for 2020/21 at 0.07 (averaging 0.1 over the T1 period) which is world class performance.

Reliability is one of our stakeholders’ top priorities.We are committed to delivering a reliable network and have consistently exceeded our reliability targets over the RIIO-T1 period, concluding with 0MWh of ‘Energy Not Supplied’ in 2020/21.  Our 8-year average is 32.64MWh against a target of 316MWh which equates to an 8-year network reliability of 99.99995%.   We have also continued to invest in the network for the benefit of future consumers and customers, exceeding [SG1] [SN2] our overall network risk target to maintain longer-term system reliability.

Emissions

Our overall business carbon footprint has fallen since the beginning of the RIIO-T1 period. We have achieved a group reduction of 68% against our 1990 baseline. In the longer-term we have targets to reduce our greenhouse gas emissions by 90% by 2040 and to net-zero by 2050.This is mainly as a result of reducing emissions that result from energy losses from our transmission lines and from reducing the leakage of SF6 (more details below). The carbon intensity of our network has fallen due to increased renewable generation.

SF6

Sulphur hexafluoride (SF6) is an extremely effective electrical insulator and has significant advantages over alternative materials. It is non-flammable, a critical requirement in the high voltage applications for which we use it. However, SF6 is also a very potent greenhouse gas.  As a responsible business, we continue to investigate and develop new ways to manage and reduce the impact of our network, business activities and operations on the environment. We are exploring new initiatives and SF6 alternatives (e.g. we use a blend of SF₆ and N₂ for Gas Insulated Lines on two sites) and leakage capture techniques..

Throughout RIIO-T1 we were measured on customer and stakeholder satisfaction through independent surveys. Our incentive/penalty limits were +/- 1% of our annual allowed revenue. Our satisfaction scores exceeded Ofgem’s targets each year.

In our final year of RIIO-T1, we were proud to have successfully continued our performance improvement, ending the period with a customer satisfaction score of 8.39, which increased from 8.21 the previous year and was 0.98 points up from our score of 7.41 at the start of the RIIO-T1 period. This improvement reflects our continued focus to understand our customers and improve the experience we provide. Our stakeholder satisfaction score also increased, from 8.64 in 2019/20 to 8.85 in 2020/21, ending the RIIO-T1 period over 1.3 points up from our initial score of 7.53 in 2013/14. Both customer and stakeholder satisfaction ended the period at their highest ever levels.

Ofgem’s RIIO-T1 stakeholder engagement incentive was designed to encourage us to engage effectively with a wide range of our stakeholders and use the outputs from this process to inform how we plan and run our business. The incentive limit was +0.5 per cent of our annual allowed revenue and our result each year was determined by an independent assessment panel.

We have used the panel’s feedback to help shape our approach to future engagement, and copies of our submissions can be found via the links below.

We’ve worked hard with our customers to improve our connections process. We’ve reduced the time it takes to offer a connection agreement from the 90 days required by our licence to 60 days on average during the past 12 months. In some straightforward cases, we’ve cut the time to just one week. 

We’re expecting to connect around 12 gigawatts of mainly low carbon new generation during the period covered by our current business plans.

National Grid Electricity Transmission (NGET) publishes its annual Transmission Losses report for the previous years. This report sets out:

(a) the level of transmission losses from our Transmission System, measured as the difference between the units of electricity metered on entry to our Transmission System and the units of electricity metered on leaving it;

(b) a progress report on the implementation of our strategy including our estimate of the contribution to minimise Transmission Losses on our Transmission System that has occurred as a result;

(c) any changes or revisions we have made to the strategy; and

(d) a description of any calculations we have used to estimate Transmission Losses on our Transmissions System.

Download the Strategy on Transmission Losses

Annual Transmission Loss Reports