Reliability Review
What is Reliability?
Is an indication of how well the system performs at delivering power to our customers
Has to do with complete interruptions of power
Does not cover momentary outages or power quality issues
Reliability Factors
Frequency of interruptions
How Do We Improve Reliability?
Reliability is improved by reducing outage frequency and duration through:
- Tree trimming and mowing
- Equipment maintenance and replacement
- Adding line reclosers and other protective devices
- Feeder configuration change (add more ties and backup connections)
- Faster customer restoration
Reliability Statistics
What Happened in 2023?
- Frequency:
- 20% less outages than 2022
- 50% less than 10 year average
- Duration:
- 30% of the customer outage hours of 2022
- 25% less than 10 year average
- Similar results to 2018 to 2020 which were consistent years
- Fewer number of Major Event Days
2023 Overview
Key Outage Indicator Comparison
Outage Causes
Tree Related Outages
Analysis
- Typically, trees cause the majority of our outages
- To more closely reflect the effect that trees have on system outages, we have combined Storm Related, Trees – Broken or Fell, and Wind for analysis
- With these combined causes, we looked at the outages by substation and by circuit
Tree Related Outages by Year
Possible Areas of Focus
Looking at locations with 3 or more outages, we should take a closer look at these areas:
Wrap-Up
Conclusion
Overall
- Almost all key indicators were down compared to the previous year and the 5 year average
Trees
- Tree related outages were down compared to the previous year and the 5 year average
Continued Focus
- Stay focused on vegetation management overall and focus on improvements in high outage areas
Future
- Review/update sectionalizing to improve exposure
Annual Outage Data (PDF)