HomeMy WebLinkAbout20210528Major Event Report.pdf May 28, 2021
Jan Noriyuki Commission Secretary Idaho Public Utilities Commission 11331 W. Chinden Blvd.
Building 8 Suite 201A
Boise, Idaho 83714 RE: Rocky Mountain Power Major Event Report
Dear: Ms. Noriyuki Rocky Mountain Power is requesting designation of the February 3, 2021 outage and the
consequences thereof to be classified as a major event and excluded from its performance results
due to the day’s performance, which exceeded the Company’s major event threshold of 1,102,990 customer minutes lost in a 24-hour period. Attached you will find details regarding the major event including restoration resources, number
of customers off supply, total customer minutes lost, as well as SAIDI, and SAIFI figures.
Rocky Mountain Power will exclude outage information for this event from its network performance reporting and from customer guarantee failure payments.
If you require further information regarding this report, please contact Ted Weston, Regulatory
Affairs Manager at (801) 220-2963. Sincerely,
Joelle Steward
Vice President Regulation
RECEIVED
2021May 28, AM 8:41
IDAHO PUBLIC
UTILITIES COMMISSION
Report to the Idaho Public Utilities Commission Electric Service Reliability – Major Event Report ID-21-1 1 of 4
REPORT TO THE IDAHO PUBLIC UTILITIES COMMISSION ELECTRIC SERVICE RELIABILITY – MAJOR EVENT REPORT ID-21-1
Event Date:
Date Submitted:
Primary Affected Locations:
Primary Cause:
Exclude From Reporting Status:
Report Prepared By:
Report Approved By:
February 3, 2021
May 28, 2021
Rexburg/Shelley
Winter Storm
Yes
Brett Carleton
Russ Updike/Dan Bodily
Event Description and Restoration Summary
During the early morning hours of February 3, 2021, a cold front passed through southeastern
Idaho. The storm brought a burst of moderate snow and gusty south by southwest winds to the
area. Snow accumulations in the upper Snake River Plain were approximately 2 to 3 inches with peak wind gusts between 35 and 45 mph. The event impacted 14,930 customers in the Rexburg and Shelley areas.
As the storm began to impact Shelley and Rexburg, crews began to respond to outages in the area.
The storm system brought sleet, snow and high winds, causing ice to build up on conductors. This
ice buildup caused lines to gallop, or swing and slap together, and forced protection devices to de-energize the lines. While crews attempted to restore power, the winds continued to inhibit restoration attempts by continuing to lock open devices. Restoration efforts could not continue
until the high winds died down. Once winds subsided, circuit breakers were closed and fuses were
replaced.
While many of the outages did not involve damaged equipment and were quickly restored, some included damaged crossarms or conductors that required replacement. Additional crew resources were provided by the Preston and Lava districts to assist in restoration efforts. In addition, due to
the snow, access in some areas was limited and only accessible by snowmobile, lengthening the
restoration times.
To date, there have been no company or commission customer complaints made regarding the
major event.
Report to the Idaho Public Utilities Commission Electric Service Reliability – Major Event Report ID-21-1 2 of 4
The graphic below displays the extent and duration of the event in the heaviest hit region.
Figure 1. Rexburg and Shelley - Total duration, in hours, experienced by customers during the event.
Event Outage Summary
# Interruptions (sustained events) 61
Total Customer Interrupted (sustained events) 14,930
Total Customer Minutes Lost 2,194,387
State Event SAIDI Impact 26 minutes
CAIDI 147
Major Event Start 2/3/2021 12:00 a.m.
Major Event End 2/4/2021 12:00 a.m.
Customer Outage Duration (in hours)
Report to the Idaho Public Utilities Commission Electric Service Reliability – Major Event Report ID-21-1 3 of 4
Restoration Intervals
Total Customer Sustained Outage Events (entire major event period)< 3 Hrs. 3 – 24 Hrs. 24 – 48 Hrs. 48+ Hrs.
14,930 11,855 3,075 0 0
Restoration Resources
Personnel Resources
Troublemen 6
Line Crew Members 30
Support Staff 1
Foreman 8
Total 45
Materials
Crossarms 4
Insulators 6
Cutouts 2
Line Splices 1
State Estimated Major Event Costs
Estimate $ Labor Contracts Materials Overheads TOTAL
Capital $9,880 $3,763 $362 $4,227 $18,232
Expense $65,163 $0 $28 $199 $65,190
Total $75,042 $3,763 $390 $4,426 $83,422
Major Event Declaration
PacifiCorp designates these events and their consequences a major event in accordance with docket PAC-E-04-07, where the company and commission agreed that determination of major events will be made by applying IEEE standard 1366-2003 methodology (commonly referred to as the 2.5 beta method), wherein a statistical outlier of these extreme events is based on the state daily SAIDI
thresholds. The company’s 2021 Idaho reliability reporting region threshold is 1,198,412 customer
minutes lost (14.04 SAIDI minutes) in a 24-hour period.
Report to the Idaho Public Utilities Commission Electric Service Reliability – Major Event Report ID-21-1 4 of 4
Event Details
SAIDI, SAIFI, CAIDI by Reliability Reporting Region
Please see the attached system-generated reports.
PacifiCorp Major Event Report
Customer Analysis
through
Sustained
Customers
Off
% Sustained
Customers
Off CML
Number of
Sustained
Interruptions
Customer
Count < 5 min
5 min ‐
3 hrs
3 hrs ‐
24 hrs
24 hrs ‐
48 hrs
48 hrs ‐
72 hrs
72 hrs ‐
96 hrs 96 + hrs
% Sustained
Customers
Restored in 3
Hours PS4 SAIDI SAIFI CAIDI
PC PACIFICORP 14,930 1% 2,194,387 61 2,019,764 4,135 11,855 3,075 ‐ ‐ ‐ ‐ 79%1.09 0.007 147
RMP Rocky Mountain Power 14,930 1% 2,194,387 61 1,212,523 4,135 11,855 3,075 ‐ ‐ ‐ ‐ 79% 1.81 0.012 147
ID Idaho 14,930 17% 2,194,387 61 85,383 4,135 11,855 3,075 ‐ ‐ ‐ ‐ 79% 25.70 0.175 147
ID MONTPELIER 18 4%3,998 1 423 ‐ ‐ 18 ‐ ‐ ‐ ‐ 0% 9.45 0.043 222
ID REXBURG 10,610 29% 1,643,577 37 36,975 3,651 8,020 2,590 ‐ ‐ ‐ ‐ 76%44.45 0.287 155
ID SHELLEY 4,302 15% 546,812 23 28,801 484 3,835 467 ‐ ‐ ‐ ‐ 89% 18.99 0.149 127
*Only current event specific metric impact shown. Exempted planned outages are excluded from these values.
through
Date*Sustained
Customers
Off
% Sustained
Customers
Off CML
Number of
Sustained
Interruptions
Average
Customer
Count < 5 min
5 min ‐
3 hrs
3 hrs ‐
24 hrs
24 hrs ‐
48 hrs
48 hrs ‐
72 hrs
72 hrs ‐
96 hrs 96 + hrs
% Sustained
Customers
Restored in 3
Hours PS4 SAIDI SAIFI CAIDI
2/3/2021 14,930 17% 2,194,387 61 85,383 4,135 11,855 3,075 ‐ ‐ ‐ ‐ 79%25.70 0.175 147
Data as of
5/18/2021
PacifiCorp
Major Events Report
Customer Analysis*
Idaho Customer Analysis
Major Event Metrics ‐
metric by state customer counts
Customer Interrupted by Date Customers Restored by Intervals
Customers Restored by Intervals Major Event Metrics ‐
metric by operating area customer counts2/3/21 12:00 AM 2/4/21 12:00 AM
2/3/21 12:00 AM 2/4/21 12:00 AM
PacifiCorp Major Event Report
SSC by State Analysis
Event through Month 02/01/21 through 02/28/21 YTD FY2021 01/01/21 through 02/28/21
SAIDI SAIFI CAIDI SAIDI SAIFI CAIDI SAIDI SAIFI CAIDI SAIDI SAIFI CAIDI SAIDI SAIFI CAIDI SAIDI SAIFI CAIDI
PC PacifiCorp 1.09 0.007 147 ‐ ‐ ‐ 1.61 0.013 122 0.53 0.006 91 2.34 0.024 98 1.25 0.017 76
RMP Rocky Mountain Power 1.81 0.012 147 ‐ ‐ ‐ 2.69 0.022 122 0.88 0.010 91 3.90 0.040 98 2.09 0.028 76
ID Idaho 25.70 0.175 147 ‐ ‐ ‐ 38.16 0.312 122 12.46 0.137 91 55.31 0.566 98 29.61 0.391 76
ID MONTPELIER 0.05 0.000 222 ‐ ‐ ‐ 0.92 0.015 63 0.88 0.014 61 1.04 0.016 66 1.00 0.015 64
ID PRESTON ‐ ‐ ‐ ‐ ‐ ‐ 0.60 0.003 197 0.60 0.003 197 0.97 0.007 143 0.97 0.007 143
ID REXBURG 19.25 0.124 155 ‐ ‐ ‐ 23.38 0.164 143 4.13 0.040 104 27.56 0.207 133 8.31 0.083 101
ID SHELLEY 6.40 0.050 127 ‐ ‐ ‐ 13.26 0.130 102 6.85 0.080 86 25.74 0.336 77 19.33 0.286 68
*Operating areas are calculated by the state frozen customer count metrics. Exempted planned outages are excluded from these values.
Data as/of
5/18/2021
PacifiCorp
Major Events Report
SSC by State
Idaho Major Events Excluded*Major Events Included Major Event Excluded Major Events Included Major Events Excluded* Major Events Included
2/4/21 12:00 AM2/3/21 12:00 AM