N.M. Admin. Code § 17.9.589.7

Current through Register Vol. 35, No. 23, December 10, 2024

Section 17.9.589.7 - DEFINITIONS

Unless otherwise specified, as used in this rule:

A.Definitions beginning with "A": "average service availability index" (ASAI) means the fraction of time (commonly converted to a percentage) that a customer has received power during the defined reporting period, as given in the following equation: customer hours service availability divided by customer hours service demand. This definition incorporates the definition from IEEE-1366-2022.

B.Definitions beginning with "B": [RESERVED]

C.Definitions beginning with "C":

(1)"commission" means the New Mexico public regulation commission;

(2)"customer average interruption duration index" (CAIDI) means the average time required to restore service, as given in the following equation: total customer minutes of interruption divided by total number of customers interrupted. This definition incorporates the definition from IEEE-1366-2022; and

(3)"customers experiencing long interruption durations" (CELID) means the ratio of individual customers that experience interruptions with durations longer than or equal to a given time. That time is either the duration of a single interruption, or the total amount of time that a customer has been interrupted during the reporting period. This definition incorporates the definition from IEEE-1366-2022.

D.Definitions beginning with "D": [RESERVED]

E.Definitions beginning with "E": [RESERVED]

F.Definitions beginning with "F": "feeder SAIFI" means the average number of times that a customer on a specific circuit is interrupted during the year, as given in the following equation: total number of customers interrupted on the circuit during the year divided by average number of customers served on the circuit during the year.

G.Definitions beginning with "G": [RESERVED]

H.Definitions beginning with "H": [RESERVED]

I.Definitions beginning with "I":

(1)"IEEE" means the institute of electrical and electronics engineers; and

(2)"interruption" means the total loss of electric power on one or more normally energized conductors to one or more customers connected to the distribution portion of the system. Interruption does not include any power quality issues such as sags, swells, impulses, or harmonics. This definition incorporates the definition from IEEE-1366-2022; and

(3)"interruption cause code categories" incorporates the categories and sub-categories defined in IEEE-1782-2022 and additionally means the following categories used in reliability reports to be filed by utilities in accordance with this Rule:

(a) equipment,

(b) lightning,

(c) planned,

(d) power supply (transmission),

(e) public,

(f) vegetation,

(g) weather (other than lightning),

(h) wildlife,

(i) unknown, and

(j) other (please specify).

J.Definitions beginning with "J": [RESERVED]

K.Definitions beginning with "K": [RESERVED]

L.Definitions beginning with "L": [RESERVED]

M.Definitions beginning with "M":

(1)"major events" means an event that exceeds reasonable design or operational limits of the electric power system. A major event includes at least one major event day. This definition incorporates the definition from IEEE-1366-2022;

(2)"major event day" (MED) means a day in which the daily system average interruption duration index (SAIDI) exceeds a MED threshold value. For the purposes of calculating daily SAIDI, any interruption that spans multiple calendar days is accrued to the day on which the interruption began. Statistically, days having a daily system SAIDI greater than the MED threshold are days on which the energy delivery system experienced stresses beyond that normally expected (such as during severe weather). This definition incorporates the definition from IEEE-1366-2022; and

(3)"momentary average interruption frequency index" (MAIFI) meansthe average frequency of momentary interruptions. This definition incorporates the definition from IEEE-1366-2022.

N.Definitions beginning with "N": [RESERVED]

O.Definitions beginning with "O": [RESERVED]

P.Definitions beginning with "P": "planned interruption" means the loss of electric power to one or more customers as a result of a planned interruption. Planned interruptions derive from transmission and distribution applications and do not apply to generation interruptions. The key test to determine if an interruption should be classified as a planned or unplanned interruption is as follows: if it is possible to defer the interruption, then the interruption is a planned interruption; otherwise, the interruption is an unplanned interruption. This definition incorporates the definition from IEEE-1366-2022.

Q.Definitions beginning with "Q": [RESERVED]

R.Definitions beginning with "R": [RESERVED]

S.Definitions beginning with "S":

(1)"system average interruption duration index" (SAIDI) means the total duration of interruption for the average customer during a specified period of time, measured in minutes of interruption, as given in the following equation: total customer minutes of interruption divided bytotal number of customers served. This definition incorporates the definition from IEEE-1366-2022;

(2)"system average interruption frequency index" (SAIFI) means how often the average customer experiences a sustained interruption over a predefined period of time, as given in the following equation: total number of customers interrupted divided by total number of customers served. This definition incorporates the definition from IEEE-1366-2022; and

(3)"sustained interruptions" means an interruption that lasts more than five minutes. This definition incorporates the definition from IEEE-1366-2022.

T.Definitions beginning with "T": [RESERVED]

U.Definitions beginning with "U": "utility" means an investor-owned electric public utility subject to the requirements of this Rule.

V.Definitions beginning with "V": [RESERVED]

W.Definitions beginning with "W": [RESERVED]

X.Definitions beginning with "X": [RESERVED]

Y.Definitions beginning with "Y": [RESERVED]

Z.Definitions beginning with "Z": [RESERVED]

N.M. Admin. Code § 17.9.589.7

Adopted by New Mexico Register, Volume XXXV, Issue 18, September 24, 2024, eff. 9/24/2024