20210420Major Event Report.pdf

ROCKY MOUNTAIN
Po\'TIER
l.l07West NordTemple
Salt lake Clty, Utah 84!16
Apil20,202l
JanNoriyuki
Commission Secretary
Idaho Public Utilities Commission
I1331 W. Chinden Blvd.
Building 8 Suite 20lA
Boise,Idaho 83714
RE: Rocky Mountain Power Major Event Report
Dear Ms. Noriyuki,
Rocky Mountain Power is requesting designation of the November 7, 2020 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 a24-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 [phone].
lce President
Y ROCKY MOUNTAIN
POWER
REPORT TO THE IDAHO PTIBLIC UTILITIES COMMISSION
ELECTRIC SERVICE RELIABILITY - MAJOR EVENT REPORT IDAO4
Event Date:
Date Submitted:
Primary Affected Locations:
Primary Cause:
Exclude From Reporting Status
Report Prepared By:
Report Approved By:
Report to the Idaho Public Utilities Commission
Electric Service Reliability - Major Event Report ID-20-3
November 7-8,2020
April20,202l
Preston/Rigby
Loss of Supply
Yes
Brett Carleton/Chase Talbot
Russ UpdikeiDan Bodily
Event Description and Restoration Summary
On the evening of November 7,2020, two pole fires on a transmission line in the Rigby, Idaho
area caused a circuit breaker at the Jefferson Substation to lock out. The following morning,
November 8,2020, a 138 kV instrument tansformer failed at the Franklin Substation causing an
outage to the 46 kV transmission line serving customers in Franklin County. The two events
impacted 10,317 customers with outage durations ranging from 40 minutes to 24 hours l3
minutes.
Wind and snowy conditions on November 7 caused two pole fires to start in the Rigby area. The
first pole fire involved a transmission pole near Ucon, Idaho, that locked out a circuit breaker in
the Jefferson substation. Substation personnel were dispatched to the Jefferson Substation where
switching was performed. Line crews isolated the pole fire on the transmission line and replaced
the pole. In a separate incident, another pole fire was caused by a failed cutout on a distribution
line near Osgood, Idaho. Crews responded and performed step restoration with the final stage
exceeding 24 hours and involving four customers.
On the morning of November 8,2020, a 138 kV instrument transformer failed at the Franklin
Substation causing the Preston, Tanner, Clifton, Weston, and Downey substations to lose power.
Internal personnel dispatched to the affected substations began switching efforts. Switching was
performed manually as SCADA capabilities are not present in the substations impacted by the
event. Step restoration efforts were utilized until all customers were restored at approximately
4:l4am.
To date, there have been no company or commission customer complaints made regarding the
major event.
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The graphic below displays the extent and duration of the event in the heaviest hit region.
Figure 7. Rigby - Total duration, in hours, experienced by customers during the event
Report to the Idaho Public Utilities Commission
Electric Service Reliability - Major Event Report ID-20-3
# lnterruptions (Gustained events)28
Total Cu3tomer lnterrupted (sustained events)'10,317
Total Customer lilnutes Lost 1,191,M8
State Evont SAIDI lmpact 14.3 minutes
CAIDI 115
Maror Event Start lnD020 6:00 p.m.
llajor Event End '111812020 6:00 p.m.
Event Outa Summ
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ao
-,aaa
Rigby
Customer Outage
Duration (in hours)
D'str'brt'on Lire
I E'I C rc"itCc,cr:
I C.rstoner Outages
r By Durat.or iHoJrst:
OO.=vaue*3
Ol*=vaue<6
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O ta t= !'B'u€ < 24
O 2a t= varue < 1 ooo'ooo
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Figure 2. Preston - Totol duration, in hours, experienced by customers during the event.
Restoration Intervals
Report to the Idaho Public Utilities Commission
Electric Service Reliability - Major Event Report D-20-3
Customer Outage
Duration (in hours)
D'str'b,rt:or Line
I By C'rcuitCotot:
I C.rstorner Outages
, By Durat'or (Holaj:
(Do'=vaiue<3
f3*=va,ue<6
O e t= vaiue < 12
O tZ .= varue < 18
| 18 '= value < 24
O Ze.= value < 1.000,000
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o tI0xfordA ?
ott
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10,3't7 9,901 412 4 0
Total Customer Sustained Outage
Events 3 - 24 Hrs.24 - 48 Hrs.< 3 Hrs.48+ Hrs.
(entil e r)l or event llod )
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Restoration Resources 1
State Estimated Major Event Costs
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's2020Idaho reliability reporting region threshold is 1,102,990 customer
minutes lost (13.23 SAIDI minutes) in a 24-hour period.
1 Data provided represents specific system records for personnel, resources and costs; it is specific to the event, not
inclusive of state delineation. However, additional resources not individually captured in transaction recording
systems were used during the event. Thus, the data presented here may understate the resources, including cost,
involved in restoring the system.
Report to the Idaho Public Utilities Commission
Electric Service Reliability - Major Event Report ID-20-3
Troublernen 1
Llne Crew llembers 6
Subctatlon Crew tembelli 6
Foreman 1
Warehousemen 2
2Englneer
t8Total
Persorrnel Rosources
Transmlrlon Poles 1
Conductor Llno (Feet)200
2Croegarmr
7!nsulatorc
Materials
$25,559
$0
$945
$0
$4,356
$0
$3,57E
$0
$34,437
$0
Caplta!
Expense
Total $25,559 $945 s4,356 $3,578 $34,437
Estirnate S Labo r Contracts Materia ls Overhcads TOTAL
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Event Details
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Report to the ldaho Public Utilities Commission
Electric Service Reliability - Major Event Report ID-20-3 5 of5
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