20190208Major Event Report (1).pdf

Y ROCKY MOUNTAIN
HSIYE*"
RECEIVED
i$ll FIB -B PH 2: 5l
1407West NorthTemple
Salt Lake City. Uah 84!16
February 8,2019
VA OVERNIGHT DELIVERY
Diane Hanian
Commission Secretary
Idaho Public Utilities Commission
472 West Washington
Boise, Idaho 83720-5983
RE: Rocky Mountain Power Major Event Report
Dear: Ms. Hanian
Rocky Mountain Power is requesting designation of the December 7,2018 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 1,333,663
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 further information regarding this report, please contact Heide Caswell, Network
Performance Director, at [phone].
Sincerely, I
Do,t/at ru' $zrzruail / arr,*
Douglas N. Bennion, P.E.
Vice President
Engineering Services & Capital Investment
cc: Bev Barker, IPUC
.ir$5ici'i
Report to the ldaho Public Utility Commission
Electric Service Reliability - Major Event Report !D-18-1
Event Date:
Date Submitted:
Primary Affected Locations:
Primary Cause:
Exclude from Reporting Status:
Report Prepared by:
Report Approved by:
December 7,2018
February 8,20L9
Rexburg
Loss of Supply
Yes
April Brewer
Heide Caswell/ Pete Singh /Tony Perkins
Event Description
On the evening of December7,2OL8, Rocky Mountain Powercustomers in Rexburg, ldaho, experienced
an outage when a dead-end shoe failed on a 69 kV switch between the Rigby substation to St. Anthony.
During this event, conductor was damaged and fell to the ground causing the circuit breakers at both
substations to trip open. The event affected nine substations, feeding a total of 25 circuits, serving
L7,977 customers, with outage durations ranging from 2 hours 39 minutes to 4 hours 38 minutes. The
loss of supply event affected approximately 53% of the customers served within the Rexburg operating
area.
# Interruptions (sustained events)32
Total Customer lnterrupted (sustained events)18,015
Total Customer Minutes Lost 3,s47,902
State Event SAIDI lmpact 44.35 Minutes
CAIDI 197
Maior Event Start t2l7/2018 12:00 AM
Maior Event End 721812018 12:00 AM
Event Outage Summary
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Restoration Summary
At 8:15 pm, on December 7,20L8, Rexburg, ldaho, experienced a loss of transmission line event when
a dead-end shoe on a 69 kV transmission line switch failed and concurrently damaged conductor,
downing the line and tripping the circuit breakers at the Rigby and St Anthony substations. The event
affected nine substation; Sugar City, Rexburg, Newdale, Canyon Creek, Moody, Egin, Ashton, Targhee
and St. Anthony. The network is currently set to an abnormal radial configuration while upgrades and a
rebuild are being performed on the loop configuration that connects the Rigby substation to the St
Anthony substation. Given the current configuration when the damage occurred it had a much larger
impact on the system.
At the time of the incident dispatch assigned four linemen to patrol different sections of the line. Once
the damaged section was identified crews began restoring feed from an alternate source. The first
restoration occurred at the Sugar City substation at 10:55 pm, restoring power to 1,941 customers fed
from four circuits. The Rexburg substation was the next to be restored at 11:08 pm, restoring power to
L0,7tO customers fed from six circuits. Newdale, Canyon Creek, and Moody substations were the next
to be restored at L1:41 pm restoring feed to 979 customers, fed from seven circuits. At t2:43 am, Egin,
Ashton, and Targhee substations were restored, restoring power to 2,016 customers, fed from five
circuits. The remaining 2,33L customers fed from the three circuits severed from the St. Anthony
substation were restored at 72:54 am. Once repairs were made the line was configured back to its
normal state.
The graphic below displays the extent and restoration stages by duration for the outages experienced
in the Rexburg area.
There were no company or commission customer complaints made regarding the major event
Canyon Creek Substation
Ashton Substation
Tarthee Substation
Moody Substation
St Anthony Substation
Egin Substation
Newdale Substation
Sugar City Substation
Rexburg Substation
Customer Outage
Duration (in hours)
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Total Customer Sustained
Outage Events
(entire major event period)
< 3 Hrs.3 - 24 Hrs. 24+ Hrs.
Restoration lntervals
Restoration Resources 1
State Estimated Major Event Costs 1
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 2018 ldaho reliability reporting region threshold is 1,333,663 customer
minutes lost (16.67 SAIDI minutes) in a 24-hour period.
1 Data provided represents speciflc system records for personnel, resources, and costs; and is specific to the event, not inclusive of state
delineation. However additional resources whose participation did not get individually captured in transaction recording systems were
utilized during the event, thus the data presented here effectively understates the resources, including cost, involved in restoring the
system to normal.
Troubleman 1
Substation crewmember 2
3TOTAL
Personnel Resources
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Labor TOTALEstimate S Contracts Materials Overhead
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Event Details
CustomerrOutvs. Tlme ldaho Maior Event
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SAIDI, SAlFl, CAIDI by Reliability Reporting Region
Please see the attached system-generated reports.
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