20151021Major Event Report.pdf

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October 21,2015
WA OVERNIGHT DELIVERY
Jean D. Jewell
Commission Secretary
Idaho Public Utilities Commission
472West Washington
Boise, Idaho 83720-5983
RE: Roclry Mountain Power Major Event Report
Dear Ms. Jewell:
Rocky Mountain Power is requesting designation of the July 29, 2015 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 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 Heide Caswell, Network
Performance Director, at [phone].
1407West NorthTemple
Salt Lake CitI, Utah 84 I 16
tn*u',yLlu* U/o 041 r"--
ennion, P.E.L,
Engineering Services & Capital Investment
Rick Sterling, IPUC
Bev Barker,IPUC
cc:
Report to the ldaho Public Utility Commission
Electric Service Reliability - Major Event Report lD-15-1
Event Date:
Date Submitted:
Primary Affected Locations:
Primary Cause:
Exclude from Reporting Status:
Report Prepared by:
Report Approved by:
July 29,2015
October 2!,20L5
Rexburg
Equipment Failure
Yes
April Brewer
Heide Caswell I Oan Bodily / Ken Short
Event Description
At 9:54 am on July 29, 2015, a line fault occurred on the Rigby-Thornton transmission
line. During the event three substations, 12 circuits, and 16,496 customers were without
power. 90% of customers were restored within 3 hours, with the final 10o/o restored in 3
hours 5 minutes.
Restoration Summary
Personnel were promptly dispatched to the area. An inspection of the Rigby-Thornton
tap showed the insulator had burned, causing the circuit breaker to trip. The Rigby
substation was the first to restore service by switching to alternate feed in just 24
minutes, returning 5,579 customers to power. The Rexburg substation was the next to
reestablish power, restoring service to 9,580 customers within 79 minutes. Restoration
to the Thornton substation took slightly longer as crews worked to replace the damaged
insulator. Thornton substation was restored ]n 3 hours 5 minutes for I,337 customers. A
total of 8 personnel participated in restoration work.
There were no company or commission customer complaints made regarding the major
event.
7l2glLs 12:00 AM
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Restoration lntervals
16,887 L5,524 1,363 0
Restoration Resources
State Estimated Major Event Costs
Major Event Declaration
PacifiCorp designates these events and the consequences thereof 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 L366-2003
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 2015 ldaho reliability reporting region threshold is 1,299,474 customer
minutes lost (15.95 SAIDI minutes) in a 24-hour period.
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Event Details
Customer Mlnutes lnterrupted vs. Tlme (cumulattve)
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SAID!, SAtFl, CAtDI by Reliability Reporting Region
Please see the attached system-generated reports.
Concurrent Outages vs. Tlme Totel Ewnt Outaras: 23
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