What we said we'd do

As the electricity transmission owner in England and Wales, we're responsible for the safe and reliable operation of an extensive network of assets. Our role is to protect the public and those who work on our network, from the inherent dangers associated with providing a high voltage electricity transmission supply.

Our outputs will make sure that we protect the public from harm. We will maintain our current high levels of reliability so that electricity is available whenever and wherever current and future consumers want it. In our T2 Business Plan submission we committed to:

  • delivering world-class levels of safety and maintain our service reliability of 99.9999 per cent.
  • investing to renew and modernise 6 to 19 per cent of our different network asset types to maintain reliability for future generations.
  • delivering three major electricity cable projects in London, Sheffield and North Wales to maintain security of supply.
     

What we’ve done and what we’re going to do

Safety

Safety continues to be our number one priority and we are pleased to report that our overall Injury Frequency Rate (IFR) improved to 0.06 for 2024/25 which is below the target of 0.1 for the first time in the RIIO-T2 period, reflecting world-class safety performance.  We hold ourselves to the highest standards for safety, proactively considering it in everything we do, and we have been building stronger relationships and working more collaboratively with our Safety, Health, Environment, Sustainability and Quality (SHESQ) colleagues across our business to continue our focus on elimination and mitigation of fatal safety risks.
 

Reliability

We are committed to delivering a reliable network, which our stakeholders consistently tell us is critical for them. Reliability performance remained strong in 2024/25 but was below our reported reliability in the first three years of RIIO-T2. In 2024/25 our total incentivised ‘Energy Not Supplied’ was 359MWh which fell short of our reliability target, the incentive neutral point of 147MWh.  Our 2024/25 performance equates to an average network reliability of 99.9998%.

In our asset replacement plan, we delivered an 8.5% increase in the volume of interventions in 2024/25, with over 1000 asset replacements completed. The overall volumes that we will deliver in T2 are slightly below our commitment noted above and we are working hard on optimising our plan for the final year of RIIO-T2.

Our large cable projects in North Wales and London are in delivery and will complete in line with their agreed timescales. For London Power Tunnels schemes, we are now moving onto decommissioning some circuits as the new ones are commissioned onto the electricity network. In Sheffield, a change in NESO system operability needs has meant that we are reviewing our design of cable replacement that will meet their requirements.