SAIDI & SAIFI
Reliability Indices
System Average Interruption Frequency Index (SAIFI)
The System Average Interruption Frequency Index (SAIFI) is the average number of interruptions that a customer experiences and is calculated as:
SAIFI = total number of customer interruptions ÷ total number of customers served
SAIFI is measured in units of interruptions per customer. It is usually measured over the course of a year in accordance to IEEE Standard 1366-2003.
System Average Interruption Duration Index (SAIDI)
The System Average Interruption Duration Index (SAIDI) is the average outage duration for each customer served and is calculated as:
SAIDI = sum of all customer interruptions ÷ total number of customers served
SAIDI is measured in units of time, often minutes or hours. It is usually measured over the course of a year in accordance to IEEE Standard 1366-200
Nairobi County Power Reliability Indices for the period January to December 2020
County
Sum of Numerator SAIFI
Sum of Numerator SAIDI
No. of Customers
SAIDI
SAIFI
CAIDI
Nairobi North County
4,464,806.22
11,501,220.19
879,437
13.1
5.1
2.6
Nairobi South County
3,569,047.22
10,548,724.07
985,463
10.7
3.6
3.0
Nairobi West County
3,919,018.35
8,760,965.72
817,949
10.7
4.8
2.2
Grand Total
11,952,871.78
30,810,909.98
2,682,849
11.5
4.5
2.6
Reliability Indices
System Average Interruption Frequency Index (SAIFI)
The System Average Interruption Frequency Index (SAIFI) is the average number of interruptions that a customer experiences and is calculated as:
SAIFI = total number of customer interruptions ÷ total number of customers served
SAIFI is measured in units of interruptions per customer. It is usually measured over the course of a year in accordance to IEEE Standard 1366-2003.
System Average Interruption Duration Index (SAIDI)
The System Average Interruption Duration Index (SAIDI) is the average outage duration for each customer served and is calculated as:
SAIDI = sum of all customer interruptions ÷ total number of customers served
SAIDI is measured in units of time, often minutes or hours. It is usually measured over the course of a year in accordance to IEEE Standard 1366-200
Nairobi County Power Reliability Indices for the period January to December 2020 |
||||||
County |
Sum of Numerator SAIFI |
Sum of Numerator SAIDI |
No. of Customers |
SAIDI |
SAIFI |
CAIDI |
Nairobi North County |
4,464,806.22 |
11,501,220.19 |
879,437 |
13.1 |
5.1 |
2.6 |
Nairobi South County |
3,569,047.22 |
10,548,724.07 |
985,463 |
10.7 |
3.6 |
3.0 |
Nairobi West County |
3,919,018.35 |
8,760,965.72 |
817,949 |
10.7 |
4.8 |
2.2 |
Grand Total |
11,952,871.78 |
30,810,909.98 |
2,682,849 |
11.5 |
4.5 |
2.6 |