Company: NEWEN
Filing Date: 2025-05-15
Form Type: 6-K
Source: 0001654954-25-005651
Chunk: 3

Company: NATIONAL GRID PLC
Filing Date: 2025-05-15
Form: 6-K
Chunk 3
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| Group Lost Time Injury Frequency Rate (LTIFR)     |                     |   0.10 |   0.08 |   0.02 |

1. We engaged Deloitte LLP in the current year and PricewaterhouseCoopers LLP (PwC) in the prior year to undertake a limited assurance engagement, using the International Standard on Assurance Engagements (ISAE) 3000 (Revised): 'Assurance Engagements Other Than Audits or Reviews of Historical Financial Information' and ISAE 3410: 'Assurance Engagements on Greenhouse Gas Statements' over a range of data points within our Responsible Business data tables. Details of Deloitte's full limited assurance opinion and National Grid's Reporting Methodology are available on our website.

### Strategic overview
**Safety and operational performance: Retained focus on reliability and resilience**

In 2024/25, National Grid delivered strong operational performance with high levels of network reliability across all our electricity networks with reliability above 99.84%, and reliability of 99.99983% in UK Electricity Transmission. Our interconnector fleet availability was 86%. These strong levels of reliability were achieved despite 8 named storms across our networks in the UK, 25 major storm events in New York, and 5 reportable storms across our New England territories, demonstrating the benefits of our continued investment in network reinforcement and the steadfast commitment of our operational teams.

During Storm Darragh in the UK, we resolved 9,000 incidents and restored 700,000 customers, with 95% of customers reconnected within 48 hours. In New England, we expanded our Fault Location, Isolation and Service Restoration (FLISR) technology to around 25% of our customers. Through this technology deployment, we have restored power to 77,000 customers within one minute this year, avoiding longer outages.

On 8 May 2025 the NESO issued its interim review report investigating the outage following the fire at our North Hyde electrical substation in March 2025. We welcome the report which establishes the timeline and sequence of events, and outlines further steps required ahead of the NESO delivering their final report, expected in June 2025.

During the year, we achieved a Lost Time Injury Frequency Rate (LTIFR) [1] of 0.10, compared to 0.08 in 2023/24 and against our Group target of 0.10, primarily driven by an increase in incidents such as trips