Electric System Average Interruption Duration Index (SAIDI) in Minutes
- Analysis of Performance
- Metric Definition
- Why Is This Important?
- City Organization Impact on Performance
- Benchmark Information
Analysis of Performance
The SAIDI index performance declined (the number increased) for the fourth quarter, primarily due to extended substation outages in August and November. One outage was related to a manufacturing error which only became apparent when enough load was placed on the substation equipment during a cable fault, and the other due to an abnormal condition in a different substation that resulted in a larger-than-normal outage for the piece of equipment that failed in the field. Compared to the 12-month period ending on the third quarter of 2014, the SAIDI index increased from 11.42 minutes to 25.54 minutes as of 31 December 2014. Fort Collins’ SAIDI number is still performing better than the average for utilities in the region, but steps and procedures have been put in place to improve performance from the current standing. The total number of customers served increased by about 500, and the number of outages was higher by 14 occurrences, and these factors had some impact on the change in this quarter’s number, but not as much as the impact of the substation equipment involvement in the fourth quarter equipment failures. Cable failures increased by 1 occurrence in comparison to the third quarter analysis period, but the cable failure occurrences in this 12-month period resulted in 168 fewer customer hours out. Staff regularly reviews outage and equipment failure data monthly to guide the use of funding and efforts for system additions and infrastructure replacement projects to support system reliability. In addition to normal outage review, more detailed after-incident reviews were performed to address substation-related outage response which will mitigate impacts for future outages. These efforts help to ensure that the citizens and businesses of our community receive world-class service while enjoying some of the lowest electric rates in the nation.
The electric distribution System Average Interruption Duration Index (SAIDI) is a description of the length of time all customers would have been out of power if the total number of hours out of service in a year's time were to be shared, and it is typically measured in minutes. The number of outages as well as the time between the start of an outage and the restoration of electric service have a bearing on this number.
Why Is This Important?
SAIDI provides our customers with a sense of how well Fort Collins Utilities responds to outages. Because SAIDI is an industry standard measure, it allows current and perspective customers to compare our quality of service to other communities.
City Organization Impact on Performance
High - Reliable electric service depends on quality installation and maintenance of utility infrastructure to avoid service interruptions and sufficient resources to respond quickly to outages as they occur. Fort Collins Light and Power is directly responsible for both of these tasks.
This metric contains regional and national benchmark data that compares the City’s performance to other public utilities. The regional benchmark accounts for local factors that impact performance on this metric; the national benchmark compares Fort Collins’ performance to national best practices.
Fort Collins strives for best-in-class reliability, represented on the chart as the first quartile (top 25%) of public power providers. The target range upper boundary is defined by the median between the start of the American Public Power Association best-performing 25% of utilities and the regional annual average SAIDI numbers. Regional annual average SAIDI numbers are calculated using the yearly SAIDI numbers from Front Range electric utilities.