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 slightly (the number increased) for the third quarter, mostly as a result of an extended substation outage in August related to a manufacturing error which only became apparent when enough load was placed on the equipment during a cable fault. Compared to the 12-month period ending on the second quarter of 2014, the SAIDI index increased from 10.10 minutes to 11.42 minutes as of 30 September 2014. Fort Collins is still performing in the best-performing 25% of public power providers, comprising utilities with SAIDI numbers of 14.47 minutes or less. The total number of customers served increased by about 500, and the number of outages was lower by 3 occurrences, so these factors had only a small impact on the change in this quarter’s number. The SAIDI number was also impacted by a slight increase in the number multi-position junction failures (1 additional failure in comparison to the 12 months ending on 30 June 2014). Cable failures increased by 3 occurrences in comparison to the second quarter analysis period resulting in 455 additional 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. 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.