20190208Major Event Report (2).pdf

ROCKY MOUNTAINPOI/ER
A I}MSION OF PACIFICORP
REC EIVED l{O7West NorthTemple
Salt Lake Clry, Utah 8,tl16
tilili f[t -8 PH 2: 5l
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February 8,2019
VA OVERNIGHT DELIVERY
Diane Hanian
Commission Secretary
Idaho Public Utilities Commission
472West Washington
Boise, Idaho 83720-5983
RE: Roclry Mountain Power Major Event Report
Dear: Ms. Hanian
Rocky Mountain Power is requesting designation of the December 26,2018 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 a 24-hour period.
Attached you will furd 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,
/o*I o 0,.7/.at )t- Bo*r,rtt'.,-
Douglas N. Bennion, P.E.
Vice President
Engineering Services & Capital Investnent
cc: Bev Barker,IPUC
Report to the ldaho Public Utility Commission
Electric Service Reliability - Major Event Report lD-18-2
Event Date:
Date Submitted:
Primary Affected Locations:
Primary Cause:
Exclude from Reporting Status:
Report Prepared by:
Report Approved by:
December 26,1OLB
February 8,2OL9
Shelley
Loss of Supply/Car hit pole
Yes
April Brewer
Heide Caswell / Seth Riding/ Dan Bodily
Event Description
On the morning of December 26,2OL8, Rocky Mountain Power customers in Shelley, ldaho, experienced
an outage when the circuit breaker at the Sugarmill Substation tripped open. The event affected three
substations, feeding a total of 10 circuits, serving L7,L49 customers. The outage duration ranged from
51 minutes to t hours 54 minutes. The loss of supply event affected approximately 64% of the customers
served within the Shelley operating area.
Restoration Summary
At 8:55 a.m., on December 26,2OL8, the circuit breaker at the Sugarmill substation tripped open. Crews
were quickly dispatched to the area. While patrolling the line, crews found a car which had slid into a
pole, determining that the impact caused lines to fault when they contacted, tripping the circuit breaker.
Upon discovery, crews were routed to the impacted substation to begin the restoration effort. At
9:47 a.m. a partial restoration was implemented by power sourced from an alternate feed, specifically
a secondary transmission source at the Ucon Substation, restoring power to 2,4t5 customers. At
t0:10 a.m. the Ammon Substation was energized, restoring power to an additional 3,145 customers. At
10:50 a.m. the Sandcreek substation was energized, restoring power to the remaining 11,589
customers.
f lnterruptions {sustained eventsl 14
Total Customer lnterrupted (sustained eventsl 17,t73
Total customer Minutes Lost 1,683,385
State Event SAIDI lmpact 21 minutes
CAIDI 98
Maror Event Start 12126/2018 12:00 AM
Major Event End 12127120L8 12:00 AM
Event Outage Summary
There were no company or commission customer complaints made regarding the major event.
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Duratlon (in hoursl
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The graphic below displays the extent and duration of the event in Shelley.
Restoration lntervals
L7,L55 18 017,173
Total Customer Sustained
Outage Events
(entire major event period)
< 3 Hrs.3 - 24 Hrs. 24+ Hrs.
2 ol4
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 (15.67 SAID! minutes) in a 24-hour period.
1 Data provided represents specific 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.
Line Crewman 2
Foreman 1
TOTAL 3
Personnel Resources
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Capital
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TOTALEstimate S Labor Contracts Materials Overheads
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Event Details
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