SA Power Networks' regulatory performance
SA Power Networks’ distribution network covers an area of about 178,200 square km, along a coastline of over 5,000 km. The network extends to over 88,322 km, of which approximately 20 percent is underground. Approximately 70 percent of customers reside in the Greater Metropolitan Area of Adelaide, but 70 percent of the network infrastructure by length is required to deliver energy to the remaining 30 percent of customers.
The Commission regulates the customer service and reliability aspects of SA Power Networks’ electricity distribution operations. SA Power Networks is the monopoly service provider of electricity distribution network services to the majority of South Australian customers.
The Commission does not regulate revenue requirements for SA Power Networks. Under the National Electricity Rules, SA Power Networks is subject to economic regulation, by the Australian Energy Regulator, in respect of the revenue it is permitted to earn from South Australian consumers. The Australian Energy Regulator considers any jurisdictional service reliability standard set by the Commission when making regulatory (revenue) determinations for SA Power Networks.
The Commission establishes certain state-based customer service and reliability standards for SA Power Networks. Those standards are prescribed in the Commission’s Electricity Distribution Code. As a condition of its electricity distribution licence, issued by the Commission, SA Power Networks is required to comply with the service standards in the Code.
Under the Commission’s Service Standards Framework, SA Power Networks is required to report on average response times to customer enquiries and provide advice on certain matters within specified timeframes on an annual basis. Quarterly performance provides an indication of general performance in regard to the annual performance targets.
Guaranteed service levels
The Electricity Distribution Code provides for a Guaranteed Service Level (GSL) regime. Under this regime, if SA Power Networks does not meet a pre-determined standard of service, it triggers a payment to the affected customer(s). The GSLs relate to the timeliness of certain actions by SA Power Networks (e.g. repair of street lights that have gone out; restoration of electricity supply after an interruption).
Network reliability performance
The Commission monitors and reports on SA Power Networks’ reliability of supply performance, as measured by supply interruptions. The key interruption metrics used are duration of interruptions (System Average Interruption Duration Index, SAIDI); and frequency of interruptions (System Average Interruption Frequency Index, SAIFI). Network performance targets are set to reflect differences in the levels of interconnection and redundancy in SA Power Networks’ physical network across the state. From July 2015 SA Power Networks’ feeders are divided into four broad categories for the purposes of monitoring network reliability:
- Short Rural
- Long Rural
The Electricity Distribution Code specifies ‘best endeavours’ SAIDI and SAIFI targets for SA Power Networks that are ceilings, such that SA Power Networks’ actual performance should not exceed them. The ‘best endeavours’ element of the targets reflect the fact that, in cases where actual performance falls short of the target, SA Power Networks must satisfy the Commission that that it has used its best endeavours in its attempt to stay within the bounds of the target.
The Commission monitors and reports on SA Power Networks’ compliance with regulatory requirements and takes enforcement action in instances of non-compliance, if necessary.
Regulatory performance reports provide information on the performance outcomes of regulated providers of essential services in South Australia. This includes the network service/reliability performance of SA Power Networks.
The Commission publishes information on SA Power Networks’ operational performance against the annual service standard targets and other indicators specified in the Electricity Distribution Code.
Performance summary for 2020-21
In 2020-21, SA Power Networks did not meet the target and exceeded the reporting threshold for the following service standards:
- duration of interruptions (normalised USAIDI) for CBD feeders,
- percentage of interruptions for CBD feeders exceeding one-hour, and
- percentage of interruptions for Rural Long feeders exceeding seven hours.
For duration of interruptions for CBD feeders, SA Power Networks had a performance of 23 minutes against the target of 15 and the reporting threshold of 20. This is an existing service standard carried over from the previous regulatory determination. The target was set to maintain historical performance. The 15-minute service standard target was based on SA Power Networks’ average historical performance over 10 years ending 30 June 2019.
For the percentage of interruptions for CBD feeders exceeding one-hour, SA Power Networks had a performance of 14.5 percent against the target of 11 percent and reporting threshold of 13.5 percent. This is a new service standard that commenced on 1 July 2020. The target was set to maintain historical performance. The 11 percent service standard target was based on SA Power Networks’ average historical performance over 10 years ending 30 June 2019.
For percentage of interruptions for Rural Long feeders exceeding seven hours, SA Power Networks has a performance of 13.1 percent against the target of 10 percent and reporting threshold of 12.5 percent. This is a new service standard that commenced on 1 July 2020. The target was set to maintain historical performance. The 10 percent service standard target was based on SA Power Networks’ average historical performance over 10 years ending 30 June 2019.
As SA Power Networks did not meet the above service standard targets, the Commission recommends that SA Power Networks review its ongoing performance in this area. The Commission will consider trends in performance, when it reviews SA Power Networks’ achievement against service standards in 2021-22.
Historical Performance Outcomes
While the Commission assesses energy entities performance against annual service standards and reliability standards each year, events may occur during the year that warrant special ad hoc reporting – referred to as Significant Performance Events.
The Commission considers the following criteria in determining whether a Significant Performance Event has occurred:
•a significant number of customers are affected for a lengthy duration, or there is reason to believe that a significant number of customers may have been affected for a lengthy duration.
•the event is likely to seriously impact on the licensed entity’s ability to meet one of more of its annual service standard(s) or reliability target(s).
•the Commission needs to undertake a review to be confident that the licensed entity has complied with its obligations under the relevant industry Code(s).
•there is strong stakeholder interest, or there is anticipated to be strong stakeholder interest.
The criteria recognise that a balance needs to be struck between reporting on every event and the resources it entails, and meeting stakeholder expectations on the provision of information in such situations.
The Commission has published the following significant event reports, in respect of the performance of SA Power Networks (formerly ETSA Utilities).
oREPORT: SA Power Networks - 27-28 December 2016 severe weather event
oREPORT: SA Power Networks' summer performance reports 2013 - 2016
oREPORT: Reliability performance in severe weather events 2010
oREPORT: Inquiry into ETSA Utilities Network performance and customer response January 2006
Time series data