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 metric is calculated by adding all customer outage minutes during a rolling twelve month period and dividing by the average number of electric customers for the same period. Since the metric is calculated as a rolling average a single outage will impact the SAIDI metric for a full year after the event.
Q4 2014 was the worst performing quarter in the past five years for customer outage minutes. A single outage event in November of 2014 accounted for 12 SAIDI minutes in the fourth quarter and also affected the first three following quarters of 2015. The root cause of that outage is well understood by staff and corrective actions are in place to prevent any future occurrence of an outage related to this root cause. The most recent quarter, Q3 2015, was the second worst performing quarter in the past five years for customer outage minutes. Although there were multiple events in that quarter that caused customer outage minutes, three of the outages are all related to a single type of cable that failed and account for 9.75 SAIDI minutes. Efforts are currently underway to mitigate future cable failures of this type. Staff has accelerated efforts to inspect existing equipment and is focusing asset management efforts towards our highest impact assets.
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.