20090615Major Event Report.pdf

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~~,l~OUNTAIN
VI OVERNIGHT DELIVRY
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Ul1L\T\E.S CO
201 South Main, Suite 2300
Salt Lake City, Utah 84111
June 15,2009
Jean D. Jewell
Commssion Secreta
Idaho Public Utilities Commssion
472 W. Washington
Boise, ID 83702
RE: Rocky Mountain Power Major Event Report
Dear Ms. Jewell:
Rocky Mountan Power is claiming major event exclusion for the weather-related outages that
affected Rocky Mountai Power's Idao service terrtory on May 12,2009.
The basis for excluding the event from the company's performance results is the extent of the
damages and the number of customer minutes lost exceeds the company's Idao thshold for
customer miutes lost durg a 24-hour period. Atthed you will find detals regarding the
major event including costs incured, restoration resources, number of customers off supply, total
customer minutes lost, and SAIDI, SAIFI, MAIFI figues.
Rocky Mountan Power will exclude outae information for this event from its network
performance reporting and from customer guatee failure payments.
If you requie fuher information regarding this report, please contact Heidemarie Caswell,
Network Performance Manager, at [phone].
Sincerely,
~~~~
Vice President
Engineering Services & Capital Investment
c: Dave Schune, IPUC
Beverly Barker, IPUC
Report to: Idaho Public Utilities Commission
Electric Service Reliabilty - Major Event Report
Event Date(s):
Date Submitted:
Primary Affected Location(s):
Exclude from Penormance Reports:
Report Prepared by:
Report Approved by:
May 12,2009
June 12,2009
Rexburg
Yes
Diane DeNuccio
Heidemare Caswell
Event Description: On May 12,2009, a strong widstorm resulted in loss of supply to customers
served in Rocky Mountain Power's Idaho service terrtory (paricularly its Rexburg operating area).
With 48 mph sustaned winds and 64 mph gusts, broken poles and wire down were the primar
causes of sustaned interrption. Seventy-two circuits (3 sub-transmission, 69 distrbution)
experienced sustaned interrptions affecting 12% of the company's Idao customers (21% of
Rexburg customers). Facilities damage included replacement of 14 distrbution poles, 16
transmission poles, 10 trsformers, 45 crossars, 700 line feet of new conductor; approximately
26,000 line feet of downed conductor needed to be restrg.
Rocky Mounta Power is requesting the designation of this storm and the consequences thereof to
be classified as a major event and excluded from its performance results because it exceeded the
design limits of the system and it exceeded the Company's major event theshold for customer
minutes lost in a 24-hour period 1.
Idaho SAIDI Minutes Excluded
Customer Minutes Lost
24.83
1,780,723
Sustained Customers Off
Sustained Interrptions
8,627
114
Resources Utiized:
Troublemanassessors 12
Internal (in-house) crewmembers 18
Internal (import) crewmembers 13
Vegetation crewmembers 5
Restoration: In Rexburg, sixteen broken transmission poles interrpted supply from Sunydell
substation to Webster substation; nine distrbution poles broke, and a ban of transformers (certified
non-PCB) fell into the Snake River. Additional company crews were borrowed from nearby
operating areas for assistace.
1 In docket PAC-E-04-07, the company and commission agreed that detennination of major events will be mae by
applyig IEEE Stadad 1366-2003, wherein a statistical outlier for these exteme events is based on state daily SAlOl
thesholds; the 2009 calculated Idao SAIDI is 18.19 minutes, which equates to a theshold of 1,304,884 customer
miutes interrted in a 24 hour period.
- 1 -
In Shelley, four poles blew over and foureen spans of wire were down in varous locations due to
fallng trees and conductor slapping together.
In a coincident event in Preston, a loss of trsmission occured when a member of the public
maneuvering an irrgation pipe accidentally made contat with the Franin-Preston 46kV line.
In total, 50 percent of the customer interrptions were restored within 3 hours; 100% of customer
interrptions were restored withn twenty-four hours.
Idaho Major Event May 12, 2009
- Customers Out -CumulatilÆ CML -24 Hour CML - 24 Hour Threhod
6,000
1,00
2,00,000
1,80,000
5,000
1,80,000
1,40,000
4,00
"5o
~
E 3,000
~()
~1,200,000 ..
l1,00,000 ~
i800,000 !l
()
2,000
600,000
400,000
200,000o 0~~ ~~ ~~ ~~ ~~ ~~ ~~ ~~ ~~ ~~ ~~
Estimated Major Event Cost:
Expense: $100,000 Capital: $200,000 Estimated Total: $300,000
SAII, SAIFI, MAIFI Report: Attched
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