20210819Major Event Report.pdf

Y ROCKY MOUNTAIN
POWER
AOIVISION OFMOH@RP
l407West NorthTemple
Salt lake City, Uah 84116
August 19,2021
Jan Noriyuki
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 March 29, 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 1,198,412
customer minutes lost in a 24-hour period.
Attached you will find details regarding the major event including restoration resources, number
of customers offsupply, 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
Af[airs Manager at [phone].
Vice President Regulation
"^.D
Y ROCKY MOUNTAIN
POWER
REPORT TO TIIE IDAHO PUBLIC UTILITIES COMMISSION
ELECTRIC SERVICE RELIABILITY - MAJOR EVENT REPORT ID-2I-2
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 lD-21-2
March 29,2021
August 19,2021
Shelley
Loss of Substation
Yes
Brett Carleton
Russ Updike/I(evin Freestone
Event Description and Restoration Summary
During the morning hours of March 29,2021, a fast-moving cold front brought unusually strong
wind gusts to the Upper Snake River Plain and surrounding areas, including 6l mph at Idaho Falls
and 55 mph at Rexburg. These wind speeds are in the top lYo of all wind gusts measured for these
locations. Gusty winds decreased significantly behind the front later that morning, though breezy
northwesterly winds continued through the afternoon. During this period of extreme weather, a
loss of substation event occurred and impacted 17,077 customers in the Shelley area.
As the storm began to impact Shelley and Rexburg, Rocky Mountain Power crews began to
respond to outages in the area. At l0:02 A.M., 9,488 customers served from Sandcreek substation
experienced a loss of substation outage when protection for a mobile transformer triggered the l6l
kV circuit switcher to open, disconnecting the transformer from the system. A line fault had
occurred on distribution circuit 14 being served by the mobile transformer. When the mobile
transformer was being re-energized, mis-adjustment of the mechanical linkage of the circuit
switcher caused one of the three phases to not re-energize resulting in a "single-phased" condition.
Once this situation was identified, the circuit switcher was opened. Relay and apparatus crews in
the area were called in to troubleshoot the substation.
The mobile transformer at Sandcreek substation was being leased from Idaho Falls Power and was
being utilized to serve area customers while construction was underway to rebuild the 69 kV
transmission line between Sugarmill and Sandcreek substations. This caused some delays as crews
were not confident with the equipment. Once the circuit switcher was identified as the problem,
the manufacturer was contacted to provide additional assistance in the repair.
To date, there have been no company or commission customer complaints made regarding the
major event.
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Y ROCKY MOUNTAIN
:P,H,E".n",,
46# lnterruptions (sustained events)
Total C ustomer I nterrupted (sustai ned events)17.O77
4,046,871Total Customer Minutes Lost
State Event SAIDI lmpact 47 minutes
CAIDI 237
312912021 12:00 a.m.Major Event Start
Major Event End 313012021 12:00 a.m.
Event Outa Sr.r
The graphic below displays the extent and duration of the event in the heaviest hit region.
Figure 7. Shelley - Totol durotion, in hours, experienced by customers during the event.
Report to the Idaho Public Utilities Commission
Electric Service Reliability - Major Event Report ID-21-l
Customer Outage
Duration (in hoursl
DrstribJtlor Une
I By CircuitColor:
I Customcroutagcs
, By Dunt'on fHortsli
OO..varu€<3
f3<-varue<6
O C .- vaiue < 12
Q 12 <= varur < 18
| 18 <= varuc < 24
Q 24 <= varua < 1-000,000
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Shelley
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Y ROCKY MOUNTAIN
:*o',,H.E^.*"*,
Restoration Intervals
Restoration Resources
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' s 2021 Idaho reliability reporting region threshold is I , I 98,412 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-l
17,077 7,437 9,640 0 0
Total Customer Sustained Outage
Events 3-24Hrs 24 - 48 Hrs< 3 Hrs.48+ Hrs
event odrentire
Troublemen 8
Crew tembers 13
Support Staff 0
Foreman 5
Total 26
Personnel Resources
Crossarms 0
lnsulatorc 1
Cutouts 1
Line Splices 0
Materials
Capltal
Expense $17,144 $1,360 $127 $18,631
Total $17,14 $1,360 s127 $18,631
Estimate $Labor Contracts Materials TOTALOverheads
3 of4
Y ROCKY MOUNTAIN
FOWER
Event Details
Customers Out vs. Time ldaho Major Event
@r7,on
12,0@
10,(D
8,0m
6,000
4,000
2,000
0
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Concurrent Outages vs. Time Total Emt Oubpes: a6
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SAIDI, SAIX'L CAIDI by Reliability Reporting Region
Please see the attached system-generated reports.
18
16
14
$"5ro
EEatI$e
4
Customer Mlnutes lnterrupted vs. ilme (cumulatlvc)
Tqtal Custmcr Minutes lnterruoted: 4046,E71
!500,0m
'l,o0o,0m
3.5oO,om
3,000,000
2,50o,(m
2,000,0q)
1'500,e'
1,000,000
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ifficastr:
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TLI'O AT,l z:ztfuM ,ngl,t+/!ttt ,l?],.l2.Jrtztirt 329/2r9$AM 3/r9lUr2flPt 3n lztl::?xtait a|2gru+fi?n 3l29lzt7tt2Plt ,f29nlr/t'?$t
Report to the Idaho Public Utilities Commission
Electric Service Reliability - Major Event Report ID-21-1 4 of4
PacifiCorp Major Event Report
Customer Analysis
PociltCorp
Moior Events Report
Customer Analysis*
su3talned
Customers
ofi
% Sustalned
Customer'
ott cMr
Number of
Sustained
lntettuDt'rons
Customer
Count <5min
5min-
3hn
3 hn.
24 hls
24hrs-
tl8 hrs
48 hrs -
72 h]s
72h]5-
96 h]s
PC PACIFICORP t7.o77 7%4.046.87t 46 2.O79.764 9.6407,437
RMP Rocl(v Mountaln Power 7,437 9,640t7
ID ldaho 7.437 9.54045
ID MONTPEUER M,896 4 423
ID PRESTON
323
1
76%
o%297 1 8,626
316 7
ID REXEURG 8%250,385 19 36.975 2.990 L40
ID SHELI"EY 13.52?---.- -3139-47%?.757.294 22 28,80L 4131 9,492
96+hr
*Only cunent event specific metric impact shown. Exempted planned outages are excluded from these values.
Date'Sustained
Customets
off
96 Sustained
Cuitomets
off CML
Numberof
Sustalned
lnterruptions
Average
Customer
Count <5min
5mln-
3 hrs
3hrs-
24 hrs
24hr3-
48 hrs
48 hrs -
72 hrs
72h,5-
95 hrs
,12912021 77.O77 20%4.046.871 46 8s,383 7,437 9,640
96+hr
Data as of
slt8l202t
lD 20210329 Major Event - charls_nervformat.{sxoustomer Analysis
Paclficorp Mafor Event Report
SSC by SfafeAnalysrb
ritrsi:ii-o-'=- " . ; -,i:-2.OO 0.m8 2?7 2.27 0.012 195 0.26 0.003 82 4.60
==',- i . : :
o.019 195 o-M o-oo5 82 7.673.34 0.014 2?7 3,77Lrr i
a2 108-!1047.&0.200 217 53.59 o.275 195 6.19 0.075
229 1.86fOlirmEUEf;o.s3 0.q)4 139 0.82 0.005 162 0.29 0.001
irnf,ft{sl o-00 o.(m 297 0.s7 0.m4 1v)o.s7 0.d)4 150 1.55
6.61 o.080 82 3.68 o.04.rt 84 34.18ilE (8iltib.:n:.:,2.93 0.037 80
0.160 7ts 4558 0.186 24s 1.64 0.026 63 71..3tulref,i-43.93
lfli{fteD 0.00 0.m0 73 o"m 0.m0 73 0.00
tOpentlng areas are calculated by the state frozen customer count me$lcs. Exempted phnned outages are orcluded frcm these values.
1D2021O329 MaJor Event - charb-newfomatrG)GsC by State 2