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
Number of customers
Duration of interruption
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
| EVENT | Totals 2023 | Totals 2021 | Previous 5 Year Average | Change |
|---|---|---|---|---|
| Outages | 230 | 278 | 304 |  -24% |
| Interruptions | 50,293 | 105,949 | 75,776 | -34% |
| Customer Hours | 193,991 | 626,193 | 312,241 | -38% |
Outage Causes
| Equipment outages | 2023 | 2022 |
|---|---|---|
| Aluminum (Insul) URD | 23 | 10 |
| Transformer | 10 | 12 |
| Copper Wire | 8 | 3 |
| Conductor | 8 | 16 |
| Cut-Out | 8 | 8 |
| Insulator | 5 | 5 |
| Aluminum Wire | 4 | 5 |
| Fuse | 2 | 6 |
| Switch | 1 | 1 |
| See Remarks | 1 | – |
| Connector/Splice/Jumper | 1 | 4 |
| Circuit Breaker | 1 | 2 |
| Recloser | – | 1 |
| Crossarm | – | 1 |
| Poles | – | 2 |
| Grand Total | 72 | 76 |
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:
| Area | Outages | Customer Hours | Customers Affected |
|---|---|---|---|
| Powell Road | 4 | 6,549 | 1,032 |
| South Shore Road | 9 | 4,663 | 1,256 |
| Wynochee Valley Road | 8 | 1,744 | 534 |
| North Shore Road | 6 | 1,649 | 729 |
| Wiskah Road | 5 | 1,322 | 292 |
| Clearwater | 5 | 1,034 | 196 |
| North River Road | 3 | 758 | 190 |
| Newskah Road | 4 | 523 | 114 |
| West Satsop Road | 4 | 234 | 132 |