20130618Major Event Report.pdf

ROCKY MOUNTAIN
POWER
ADMslOX Or il,ClFl@RP
l407West NordTemplc
Sah Lake CkI, l.rah 84116
June 18,2013
YIA OVERNIGHT DELIVERY
Jean D. Jewell
Commission Secretary
Idaho Public Utilities Commission
472West Washington
Boise, Idalro 83720-5983
RE: Roclry Mountain Power Major Event Report
Dear: Ms. Jewell
Rocky Mountain Power is requesting designation of the April 29, 2013 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
l,ll4,l49 customer minutes lost in a24-hottr 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 Heide Caswell, Network
Performance Director, at [phone].
Sincerely,
X[1",f\-lrxrn/g
@ffrey K. Larsen
Vice President, Regulation & Govemment Affairs
cc: Rick Sterling,IPUC
Bev Barker, IPUC
rt to: Idaho Public Utilities Commission
Electric Service Reliability - Major Event Report ID-13-2
Event Date(s):
Date Submitted:
Primary Affected Location(s):
Exclude from Performance Reports:
Report Prepared by:
Report Approved by:
April29,2013 9:52am
Jvne 17,2013
Shelley
Yes
Diane DeNuccio
TJ Golo, Heide Caswell
Event Description: On April 29,2013, strong winds caused damage to Rocky Mountain Power's
facilities resulting in significant outages to its customers in Idaho due to poles and conductor
falling, airborne objects blown into facilities, pole fires, and high winds whipping lines into other
lines or vegetation. In addition, a circuit breaker at Goshen substation failed catastrophically,
accounting for about a third of the total event customer minutes lost.
Twenty-six substations and 42 circuits experienced sustained intemrptions, affecting 4l%o of the
Company's Shelley customers (16% of its Idaho customers). Facilities replacement included one
distribution pole and 6 crossarms.
Rocky Mountain Power requests the designation of this event and the consequences thereof be
classified as a major event and excluded from its reliability performance results as it exceeded the
Company's 2013 major event threshold of 1,1 14,149 customer minutes lost in a24-hotx periodl.
Idaho SAIDI Minutes Excluded 24.t6 Sustained Customers Off 12,148
Customer Minutes Lost 1,g34,g l g Sustained Intemrptions 68
Resources Utilized:
Troubleman/Assessors 9
Local crewmembers 9
Vegetation crewmembers I
Substation crewmembers 4
Restoration:
Crews worked multiple locations replacing cross arms, repairing jumpers, replacing poles, and
repairing a failed breaker in a substation. The failed breaker spewed oil and debris over the power
I In docket PAC-E-04-07, the company and commission agreed that determination of major events will be made by
applying IEEE Standard 1366-2003, wherein a statistical outlier for these extreme events is based on state daily SAIDI
thresholds; the 2013 calculated Idaho SAIDI is 14.67 minutes, which equates to a threshold of l, I 14,l4gcustomer
minutes intemrpted n a 24 hour period.-l-
transformer and the other circuit breakers in the substation. The power transformer and circuit
breakers were de-energized while all of the equipment was cleaned.
Estimated Major Event Cost:
Approximately $ I 00,000.
SAIDI, SAIFI, CAIDI Report: Attached
tdaho Major Event Apri! 29, 2013
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