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 first quarter of 2015 in comparison to the fourth quarter of 2014 since the current 12-month period over which the index is calculated now includes the seasonal increase in equipment failures that occur during the spring months of both 2014 and 2015. In particular, there are 7 more occurrences of medium voltage elbow (connector) failures, 2 additional occurrences of medium voltage cable failures, and one additional occurrence of a single phase padmounted transformer failure, resulting in an additional 59 customer-hours out due to equipment failures. Equipment failures were the leading cause of outages in this time period followed by outages related to excavation damage (1,276 customer-hours out), and vehicle strikes to utility equipment (accounting for 626 customer-hours out). While the SAIDI index has a noticeable shift from 11.42 minutes in the third quarter of 2014 to the values of 25.54 and 26.64 in the last quarter of 2014 and the first quarter of 2015, respectively, Fort Collins’ SAIDI number is still performing better than the average for utilities in the region. The increase in the fourth quarter of 2014 was primarily due to extended substation outages in August and November. Since the SAIDI index is calculated over a 12-month period, this increase will likely continue to show up in our SAIDI performance until the fourth quarter of 2015, when the substation-related outages drop out of the calculation window. It is important to know that 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 and operational measures which will mitigate impacts for future outages were identified from these reviews. Both the normal and special after-incident reviews 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.