Reliability
Performance summary 2022/2023
Overview of outputs
11Improve network performance by the end of RIIO-ED1 so that, on average, customers will have 16% fewer power cuts and have their electricity supplies restored 23% quicker.(See note 1 below).Customer interruptions have reduced by 42% and customer minutes lost have reduced by 49% from the underlying performance benchmark.
12Make sure that at least 85% of customers have their power restored within an hour of a high voltage fault happening.(See note 2 below)85.35 % of customers had their power restored within one hour of a high voltage fault.
Overview of outputs
13Reduce by 20% the number of customers experiencing a power cut which lasts for 12 hours or more.(See note 1 below).The number of customers without electricity for more than 12 hours (where the GSOP applied) was 1,257, an improvement of over 88% on our 2012/13 benchmark performance. Customers received a set payment where we failed to achieve the GSOP.
14Achieve no failures on all other GSOPs.(See note 2)There were only 70 failures across all other categories.
Overview of outputs
15Reduce by 20% the number of customers classified as worst served.(See note 1 below).During the course of RIIO-ED1 projects to reduce the number of worst served customers have been put in place for 15,461 customers. Our target for the whole of RIIO-ED1 was 6,812 customers
Overview of outputs
16Apply flood defences to 75 substations, reducing the risk of both damage to equipment and power cuts due to flooding.(See note 1 below).We have achieved our RIIO-ED1 targets. Across the whole of RIIO-ED1 we installed flood defences at 86 substations.
17Speed up the programme of tree clearance (specifically related to storm resilience) by 40%, with the aim of clearing 700km of overhead lines per year (delivering the programme five years earlier than suggested by Government guidelines).(See note 1 below)We have met the RIIO-ED1 target and completed the programme of tree clearance for resilience that we committed to for the whole of RIIO-ED1.
18Improve substation battery life to last for 72 hours if there is a major, network-wide power loss.(See note 1 below)We have completed our programmes for resilience of protection batteries, SCADA batteries and telecommunications site supplies.
Note 1: Targets are for the full eight year RIIO-ED1 period, not for a discrete year
Note 2: Target to be achieved each year of RIIO-ED1