EU28 Reliability (Customer) - CAIDI, SAIFI and CEMI-4

 

F2007

F2008

F2009

F2010

F2011

F2012

CAIDI (hours)
Target

2.15

2.15

2.15

2.15

2.15

2.35

Normalized, excluding major events

2.16

2.24

2.47

2.28

2.20

 
SAIFI (frequency)
Target

1.23

1.23

1.31

1.27

1.22

1.50

Normalized, excluding major events

1.33

1.52

1.68

1.52

1.49

 
CEMI-4 (percentage)
Target

11.0

10.0

9.00

8.50

8.00

12.00

Normalized, excluding major events

7.30

8.60

11.57

13.09

13.56

 


Note: Our reliability targets are based on specific values; however, performance within 10 per cent is considered acceptable given the wide range of variations in weather patterns and other uncontrollable elements that can significantly disrupt the electrical system. BC Hydro measures reliability under normal circumstances, because major events are not predictable and largely uncontrollable. The reliability measure is therefore based on data that excludes major events.

Fiscal 2011 CAIDI at 2.20 per cent is within 10 per cent of plan while SAIFI and CEMI-4 are worse than plan. The poor SAIFI and CEMI-4 performance is mainly due to outages caused by trees, adverse weather and equipment failure. These three causes contributed to over 50 per cent of the total customer hours lost and over 40 per cent of customer interruptions. Tree outages alone contributed to over 30 per cent of the total customer hours lost and 20 per cent of the total customer interruptions. The good CAIDI performance is mainly due to faster outage restoration time compared to historical average.