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Electric System Average Interruption Duration Index (SAIDI) in Minutes

Fort Collins Light & Power reliability in one sentence (SAIDI is how long, on average, each customer was without power in the last year):

On average, a customer in Fort Collins can expect a 58 minute outage about every 2.9 years.

  • The 21Q3 SAIDI value of 19.34 minutes increased from 14.63 minutes in the prior quarter.
  • Taken into context with each other, SAIDI, CAIDI and SAIFI, describe a more complete picture of reliability.  21Q3 reliability was reduced overall with increase in frequency and a small reduction in duration of outages.
  • The increased frequency of outages was driven by dig-in outages. Dig-in failures are occurring as a result of an increase of excavation and directional drilling as part of the broadband deployment.
  • The change in duration (customer-hours out) is primarily a function of the type of equipment failures that occurred in the 12-month period ending 21Q1. The prominent equipment failure types (medium voltage cables and connectors) were substantially the same as in Q2, so the drop in duration was not enough to improve reliability in light of the increased frequency of outages.

Customer Average Interruption Duration Index (CAIDI) in Minutes

How long, on average, it takes to restore power to a customer experiencing an electric outage.

  • The average outage duration decreased from 59.64 minutes  minutes to 57.66 minutes.
  • Taken into context with each other, SAIDI, CAIDI and SAIFI, describe a more complete picture of reliability.  21Q3 reliability dropped overall with an increase in frequency and a small reduction in duration of outages.
  • The small decrease in duration (customer-hours out) is primarily a function of the type of equipment failures (medium voltage cable and connectors) that occurred in the 12-month period ending 21Q3, which were substantially the same as the last reporting period.

Electric System Average Interruption Frequency Index (SAIFI)

Fort Collins Light & Power reliability in one sentence: 
How many times per year the average customer experiences a power outage. 

  • SAIFI increased in 21Q3 to 0.34 outages per year from the 21Q2 number of 0.25 outages per year.
  • The increased frequency of outages was driven by dig-in outages. Dig-in failures are occurring as a result of increased excavation and directional drilling as part of the broadband deployment. 
  • 89 dig-in outages have occurred in the last 12 months, approximately 51% of the 175 dig-in failures that have occurred over the last 5 years. (That percentage is up 4% from last quarter.)