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Salt Lake City. Utah 84116
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Idaho Public Utilities Commission
472 West Washington
Boise, Idaho 83720-5983
Attn: Jean Jewell
RE:Rocky Mountain Power Major Event Report
Rocky Mountain Power is claiming major event exclusion for the weather-related outages that
affected Rocky Mountain Power s Idaho service territory on October 6, 2007.
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 Idaho threshold for
customer minutes lost during a 24-hour period. Attached you will find details regarding the
major event including costs incurred, restoration resources, number of customers off supply, total
customer minutes lost, and SAID I, SAIFI, MAIFI 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 Heidemarie Caswell
Network Performance Manager, at (503) 813-6216.
Sincerely,
LIWt f) 1turr~
Doug Bennion
Managing Director
Dave Schunke, IPUC
Bev Barker, IPUC
Report to: Idaho Public Utilities Commission
Electric Service Reliability - Major Event Report
Primary Affected Locations:
Exclude from Performance Reports:
October 6, 2007
October 22, 2007
Shelley, Rexburg
Yes
Event Date(s):
Date Submitted:
Report Prepared by:
Report Approved by:
Diane DeNuccio
Heidemarie Caswell
Event Description: An early fall snowstorm in Idaho on October 6, 2007, caused extensive
damage to facilities, resulting in significant sustained interruptions to customers served in the
company s Shelley and Rexburg operating areas. With leaves still on trees, heavy snow caused
limbs to break and branches to sag, making contact with distribution lines. Numerous overhead
services were tom down, pulling masts off customers' homes. Wire down and blown fuses were the
primary causes of sustained interruption. In all, 43 distribution circuits experienced sustained
interruptions affecting 16% of the Company s Idaho customers (19% of Rexburg and 23% of
Shelley customers). Facilities damage included replacement of 4 poles, 4 transformers, 15
crossarms, approximately 2500 line feet of conductor and hundreds of fuses.
Rocky Mountain 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 PUC-approved threshold for customer
minutes lost in a 24-hour period.
Idaho SAIDI Minutes Excluded
Customer Minutes Lost
51.4
560 004
Sustained Customers Off
Sustained Interruptions
154
117
Resources Utilized:
Troubleman/assessors
Internal (in-house) crewmembers
Internal (import) crewmembers
External (contract) crewmembers
Vegetation crewmembers
Support staff
Restoration Issues: Additional crews were borrowed from other Idaho operating areas to assist
Shelley and Rexburg personnel; no external contract crews responded. Local staff that happened to
be on vacation during the event came in to assist restoration. Tree crews were brought in to help
clear lines of limbs and to trim branches that may break under the weight of heavy snow.
Restoration crews patrolled lines, sectionalized where locations permitted and restored power as
- 1 -
quickly as possible. Some customers remained out of service until private repairs were made to
damaged meterbases and masts prior to reconnection. Almost half the interruptions were restored
within 3 hours; however, three customers remained out for about 26 hours.
Idaho October 6 , 2007 Major Event Customers and CML
Customers Out -Cumulatiloe CML 24 Hour CML 24 Hour Threshold
9000
8000
- -- -- ----
7000
6000
5000
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gj 4000
(.)
3000
2000 -
---
1000
10/6/07 10/6/07 10/6/07 10/6/07 10/7/07 10/7/0710/6/07 10/7/07 10/7/07 10/7/07
Estimated Major Event Cost:
Capital:$35 000 Total:$135.000Expense: $100 000
SAID I, SAIFI, MAIFI Report: Attached
2 of2
4000000
3500000
3000000
2500000 ~
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10/8/07
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