20151021Major Event Report 3.pdf

ROCKY MOUNTAIN
POWER
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LIT ll-l r i :li L.t,- ; ,;;"-i'ii'.1,iOctober 21,2015
VIA OWRNIGHT DELIVERY
Jean D. Jewell
Commission Secretary
Idaho Public Utilities Commission
472West Washington
Boise, Idaho 83720-5983
RE: Rocky Mountain Power Major Event Report
Dear Ms. Jewell:
Rocky Mountain Power is requesting designation of the August 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,lI4,I49 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 fuither information regarding this report, please contact Heide Caswell, Network
Performance Director, at [phone].
Vice President
Engineering Services & Capital Investment
Rick Sterling, IPUC
Bev Barker,IPUC
1407West NorthTemple
Salt Lake City, Uah 84116
Report to the ldaho Public Utility Commission
Electric Service Reliability - Major Event Report ID-15-3
Event Date:
Date Submitted:
Primary Affected Locations:
Primary Cause:
Exclude from Reporting Status:
Report Prepared by:
Report Approved by:
August 29 - 30,20Ls
October 2L,2015
Shelley and Rexburg
Lightning
Yes
April Brewer
Heide Caswell / Oan Bodily / Ken Short
Event Description
On August 29,2OL5,ldaho experienced a severe thunderstorm. The storm brought
lightning, wind, and heavy rain to southeast ldaho. During the storm two significant
outages occurred. The first outage occurred at 7:35 pm in Mud Lake when high winds,
specifically micro-bursts, caused damage to almost a dozen poles. The outage affected
431 customers, with restorations ranging from 2 hours to 17.5 hours; the latest
restoration stage was the longest outage duration recorded during the event. The
second significant impact occurred at 10:58 pm, when lightning made contact with the
Ucon substation, faulting the substation and de-energizing two circuits, affecting 2,664
customers for 6 hours and 53 minutes. The graphics below show the outage event
summary and the weather conditions during the event.
Total Customer Minutes Lost L,425,3!7
8/39lt5 12:19 PM
Lof4
Storm Radar August 29,2OL5,10:06 pm
http://www.wundersround.com/wundermap
Lightning Strikes August 29,zOLs
l2:fi)pm - August 30, 2015 12:fi) pm
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Restoration Summary
On the evening of August 29, Mud Lake, Utah, experienced a microburst of wind, which
broke 11 distribution poles. Crews were able to restore power to some customers from
another circuit, while others were isolated and step restored. Two crews replaced the
poles and the final restoration was complete in 17.5 hours. Later that evening as the
storm grew, lightning related outages increased. At 10:53 pm the Ucon substation was
hit with lighting, destroying two transformer power fuses and two station service
transformers. The fuses and station service transformers were extensively damaged and
required replacement. Substation crews tested the equipment and all customers were
restored in 6 hours 53 minutes. Due to the circuit make up and loading, a load transfer
was not possible.
There were no company or commission customer complaints made regarding the major
event.
2of 4
Restoration !ntervals
Restoration Resources
3,726 654 3,072 0
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 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 20L5 ldaho reliability reporting region threshold is 1,299,474 customer
minutes lost (15.95 SAIDI minutes) in a 24-hour period.
3 of 4
Event Details
SAlDl, SAlFl, CAIDI by Reliability Reporting Region
Please see the attached system-generated reports.
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