New Zealand Gazette – 2008 – No. 53

Page 1493

✨ Electricity Reliability Performance Measures

Requirement 21 (Schedule 1, Part 5)

Reliability Performance Measures

Year ended 31 March 2007

Interruptions	2008/2012 Target	2008 Target	2007	2006	2005	2004
Total interruptions	951	1,003	988	869	983	1,012
a) Planned interruptions (Class B)	510	550	543	432	463	490
b) Unplanned interruptions (Class C)	441	453	445	437	520	522

| Unplanned interruptions not restored within: | | | | | | |
| a) 3 Hours (%) | | 31.01% | 25.23% | 26.00% | | 43.00% |
| b) 24 Hours (%) | | 2.70% | 0.46% | 0.96% | | 1.72% |

Faults	2008/2012 Target	2008 Target	2007	2006	2005	2004
Faults/100km
a) Total No. of faults	9.01	9.25	9.08	8.92	9.36	10.67
b) i) 33kV line voltage
a) Total no. of faults	6.01	6.28	5.84	9.82	5.63	5.17
ii) 11kV line voltage
a) Total no. of faults	9.30	9.54	9.33	8.84	9.71	11.20

| Faults/100km of underground line | | | | | | |
| a) Total | 6.70 | 6.60 | 8.82 | | 7.22 | |
| b) 33kV | | 5.03 | 16.81 | | 6.60 | |
| c) 11kV | 6.80 | 6.61 | 9.28 | | 7.59 | |

| Faults/100km of overhead line | | | | | | |
| a) Total | | 9.86 | 9.10 | 9.44 | 11.18 | |
| b) 33kV | | 11.06 | 9.22 | 6.08 | 5.06 | |
| c) 11kV | | 9.74 | 9.20 | 9.78 | 11.81 | |

Note: ¹² substation equipment faults are now classed as underground 33kV faults

Reliability Measures	2008/2012 Target	2008 Target	2007	2006	2005	2004
Total SAIDI (Classes B & C)	153	153	140	134	156	202
SAIDI
a) Planned interruptions (Class B)	38	38	33	28	25	30
b) Unplanned interruptions (Class C)	115	115	105	106	130	171
c) Unplanned interruptions Transpower (Class D)	0.45		0.03		5

| Total SAIFI (Classes B & C) | 2.39 | 2.39 | 2.15 | 2.83 | 3.21 | 2.38 |
| SAIFI | | | | | | |
| a) Planned Interruptions (Class B)| 0.19 | 0.19 | 0.23 | 0.18 | 0.16 | 0.21 |
| b) Unplanned interruptions (Class C)| 2.20 | 2.20 | 1.92 | 2.65 | 3.05 | 2.17 |
| c) Unplanned interruptions Transpower (Class D)| 0.03 | | 0.01 | | 0.20 | |

| Total CAIDI (Classes B & C) | 64 | 64 | 63 | 47 | 48 | 85 |
| CAIDI | | | | | | |
| a) Planned interruptions (Class B)| 201 | 201 | 147 | 160 | 154 | 141 |
| b) Unplanned interruptions (Class C)| 52 | 52 | 55 | 40 | 43 | 79 |
| c) Unplanned interruptions Transpower (Class D)| 16 | | 3 | | 22 | |

VUW Te Waharoa — NZ Gazette 2008, No 53

Gazette.govt.nz — NZ Gazette 2008, No 53

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