20060324Decision memo.pdf

DECISION MEMORANDUM
TO:COMMISSIONER KJELLANDER
COMMISSIONER SMITH
COMMISSIONER HANSEN
COMMISSION SECRETARY
LEGAL
WORKING FILE
FROM:DAVE SCHUNKE
DATE:MARCH 21 , 2006
RE:PACIFICORP'S COMPLIANCE FILING IN CASE NO. PAC-04-
ORDER NO. 29698; REVISIONS TO THE COMPANY'S CUSTOMER
GUARANTEE RULE 25 AND SCHEDULE 300
On March 7, 2006, PacifiCorp (d.a. Utah Power & Light Company) filed an application
regarding revisions to the Company s Customer Guarantee Rule 25 and Schedule 300, #3 in
Case No. PAC-04-, Order No. 29698. That Order stated:
That the Company provide a specific proposal to continue
monitoring momentary events as soon as possible.
In accordance with this provision the Company, working with the Commission Staff, has
filed a plan to ensure momentary outage events be evaluated on a statewide basis to review
system performance in Idaho.
BACKGROUND
The Company filed on December 2, 2004 to extend its Service Standards Program which
comprises the Customer Guarantees and Network Performance Standards. At that time, the
Company proposed that both programs be modified slightly to reflect experiences gained during
the prior 5-year period. Within the Network Performance Standards, the Company proposed
removal of a MAIFI (Momentary Average Interruption Frequency Index) commitment. The
Company has limited substation SCADA (System Control and Data Acquisition) equipment that
is capable of detecting interruptions to support an accurate MAIFI metric. The Company had
previously developed a surrogate method of measurement for the short interruptions that MAIFI
DECISION MEMORANDUM - 1 -MARCH 21 , 2006
is designed to capture for substations that do not have SCADA. However, this surrogate method
is not accurately transformed into a MAIFI metric. Recognizing this, the Company and
Commission Staff have concurred that reporting two different short-interruption measures
dependent upon the type of equipment at the substation, would provide the Company and the
Commission Staff awareness of areas within the system that may be experiencing unusual short-
interruption performance.
SUMMARY AND RECOMMENDATION
In compliance with P AC-04- 7 the Company has filed the Short Interruption
Measurement Plan, which they propose be used to measure short duration outages for both
SCADA and non-SCADA substations. Using the method outlined, these results will be provided
annually with its regular report of Idaho reliability to Commission Staff. Staff recommends that
the Commission accept the Plan for filing.
COMMISSION DECISION
Does the Commission wish to accept the Company s Short Interruption Measurement
Plan for filing?
\!Qt.
ave Schunke
udmemos/PACEO4.7 dec memo
DECISION MEMORANDUM - 2 -MARCH 21 2006