HomeMy WebLinkAbout20100819Major Event Report.pdf~ROCKY MOUNTAIN
POWER
A DMSION OF PAFIORP
F\r-.n..-t~ctJt"
1407 We Nort Temple
Sat Lake City, Ut 84116
ioin AUG l 9 PH 2: S9
Augut 19,2010
VI OVERNIGHT DELIVRY
Idaho Public Utilties Commssion
472 West Washigton
Boise, Idaho 83720-5983
Att: Jean Jewell
RE: Rocky Mountan Power Major Event Report
Enclosed for filing is an original and seven copies of a major event report. Rocky Mounta
Power is claimig major event exclusion for the loss of trmission outages that afected Rocky
Mountain Power's Idao service terrtory on July 14,2010.
The basis for excluding the event from the company's performance results is the number of
customer miutes lost exceeds the company's Idao theshold for customer miutes lost durg a
24-hour period. Atthed you will find detas regarding the major event includg costs
incured, restoration resources, number of customers off supply, tota customer miutes lost, and
SAIDI, SAIFI, MAIFI figues.
Rocky Mountain Power will exclude outage information for ths event from its network
performance reporting and from customer guantee failure payments.
If you require fuer inormation regardig ths report, please contact Joshua Jones, Reliabilty
Engineer, at (801) 220-4212.
Sincerely,~n.~
Douglas N. Bennon, P.E.( ~ )
Vice Prsident
Engineerig Servces & Capital Investment
c: Dave Schune, IPUC
Bev Barker, IPUC
Report to: Idaho Public Utilities Commission
Electric Service Reliabilty - Major Event Report ID-IO-3
Event Date(s):
Date Submitted:
Primary Afected Location(s):
Exc:ude from Penormance Reports:
Report Prepared by:
Report Approved by:
July 14,2010
Augu 16,2010
Rexburg
Yes
Diane DeNuccio
Joshua Jones
Event Description: In the early morng hour of July 14,2010, a transmission line just outside
Webster substation failed due to normal deterioration. The failed wie resulted in an outage to the
transmission line afecting 6,679 customers. A majority of the restoration was accomplished
though switchig substations to alternative feeds until the downed line could be repaid.
Sustaned interrptions afected 22% of the company's Rexburg customers.
Rocky Mounta Power is requesting the designation of ths event 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 theshold of 1,226,654 customer minutes
lost in a 24-hour period 1.
Idaho SAIDI Minutes Excluded 20.77 Sustained Customers Off 16,679
Customer Minutes Lost 1,522,069 Sustaned Interrptions 145
Resources Utiized:
Local crewmembers
Troubleman Assessors
6
2
Restoration:
Durg patrol, personnel discovered the failed transmission line located in far fields of grai and
potatoes that were being watered at the time. The ground conditions hapered the crews' access to
the line. An attempt to switch Sugar City load tQ an alternte source resulted in thermal overload
withn 10 miutes, tag out thre additiona substtions. Consultation between dispatch, general
foreman and area engineers determned that Sugar City could be safely fed from the Rexburg feed
instead. The St. Anthony feed was tied in a loop with the Rexburg feed, restorig all substations
and circuits. Over half the afected customers (62%) were restored with the hour; the longest
durtion outage was just over 8 hours, afecting 656 customers on Newdale #12 circuit.
i In docket PAC-E-Q4-07, the company and commission agreed that determation of major events wil be made by
applyig IEEE Stadad 1366-2003, wherein a statistical outlier for these exteme events is based on state daily SAlOl
thesholds; the 2010 calculated Idaho SAII is 16.74 miutes, which equates to a threshold of 1,226,654 customer
minutes interrpted in a 24 hour period.
- 1 -
~ 4,000o'"
l::u 3,000
Idaho Major Event July 14, 2010
- Customrs Out -Cumulative CML - 24 Hour CML - 24 Hour Threshod
7,00
.,L.
J \r-..\\r \\\J
.
~\
r-.\.
2,000,000
1,800,00
1,600,00
1,400,0
1,200,00 ~..'"!l::c1,000,000 ~
Oi
E
800,00 ~"u
600,000
400,000
200,00
0
6,000
5,000
2,00
1,000
o
7/14/100:00 7/14/104:48 7/14/109:36 7/14/1014:24 7/14/1019:12 7/15/100:00 7/15/104:48 7/15/109:36
Estimated Major Event Cost:
Due to the natue of the event, the incrementa costs incured by the company were immaterial.
SAIDI, SAI, MAFI Report: Attched
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