RR Credit: Reliability Performance Assessment

(1-6 points)

Applicable to: Cities & Utilities, Campuses, Transit

INTENT

To give operators and customers greater transparency on interruption duration and frequency.

REQUIREMENTS

All projects

Calculate SAIDI and SAIFI based on the interruption data recorded by the project, as specified in IEEE 1366. Report reliability indices for the three most recent years. If data for the full three years are not available, report indices for at least the most recent year, and provide justification for the missing data. At a minimum, projects should have a manual process at the low voltage level to monitor and report SAIDI and SAIFI interruption data.

Points are awarded according to Tables 1 and 2, where the values for duration and frequency of outages are maximums.

Table 1. Points for SAIDI

Average Annual SAIDI Performance Value	(in minutes)	Points
Cities & Utilities	Campus & Transit
≤ 164	≤ 49	1
129	18	2
94	1	3

Table 2. Points for SAIFI

Average Annual SAIFI Performance Value	(in numbers)	Points
Cities & Utilities	Campus & Transit
≤ 1.58	≤ 0.6	1
1.16	0.2	2
0.75	0.02	3

Cities and Utilities

Calculate reliability indices both with and without major event days (MEDs) as specified in IEEE 1366. Commit to disclosing the former in regulatory filings and annual performance reports; use the latter for the PEER submission.

Campuses

For each year, calculate reliability indices with major event days (MEDs) as specified in IEEE 1366. Calculate the average of these values for scoring purposes.

Transit

Use methodology described in IEEE 1366 to calculate reliability indices with number of trips scheduled and affected due to power interruption. For each year, calculate reliability indices including Major Event Days (MEDs) as specified in the methodology.

Standard and Reference:

Institute of Electrical and Electronics Engineers (IEEE) 1366-2012 Guide for Electric Power Distribution Reliability Indices

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