New Zealand Gazette – 2007 – No. 34

Page 868

✨ Electricity Reliability Statistics



Requirement 21 (Schedule 1, Part 5)

Reliability Performance Measures

Year ended 31 March 2006

Interruptions

2007/10 Target 2007 Target 2006 2005 2004 2003
Total interruptions 914 999 869 983 1,012 583
a) Planned interruptions (Class B) 463 556 432 463 490 324
b) Unplanned interruptions (Class C) 451 443 437 520 522 259

Unplanned interruptions not restored within:

2006 2005 2004 2003
a) 3 Hours (%) 25.23% 26.00% 43.00% 29.00%
b) 24 Hours (%) 0.46% 0.96% 1.72% 0.39%

Faults

Faults/100km 2007/10 Target 2007 Target 2006 2005 2004 2003
a) Total No. of faults 9.80 9.80 8.92 9.36 10.67 8.96
b) Next year targets
c) Next 5 year average target
d) i) 33kV line voltage
a) Total no. of faults 6.20 6.70 9.82 5.63 5.17 3.58
b) Next year target
c) Next 5 year target
ii) 11kV line voltage
a) Total no. of faults 9.90 9.00 8.84 9.71 11.20 8.89
b) Next year target
c) Next 5 year target

Faults/100km of underground line

2007/10 Target 2007 Target 2006 2005 2004
a) Total 6.60 8.82 7.22 10.06
b) 33kV 16.81 * *6.60 *
c) 11kV 6.61 9.28 7.59 10.06

Faults/100km of overhead line

2007/10 Target 2007 Target 2006 2005 2004
a) Total 9.10 9.44 11.18 12.52
b) 33kV 9.22 6.08 5.06 3.20
c) 11kV 9.20 9.78 11.81 9.31

Note: 2 substation equipment faults are now classed as underground 33kV faults

Reliability Measures

2007/10 Target 2007 Target 2006 2005 2004 2003
Total SAIDI (Classes B & C) 153 153 134 156 202 97
SAIDI
a) Planned interruptions (Class B) 38 38 28 25 30 25
b) Unplanned interruptions (Class C) 115 115 106 130 171 72
c) Unplanned interruptions Transpower (Class D) - - 0.03 5 - -

| Total SAIFI (Classes B & C) | 2.40 | 2.40 | 2.83 | 3.21 | 2.38 | 2.02 |
| SAIFI | | | | | |
| a) Planned Interruptions (Class B) | 0.20 | 0.20 | 0.18 | 0.16 | 0.21 | 0.22 |
| b) Unplanned interruptions (Class C) | 2.20 | 2.20 | 2.65 | 3.05 | 2.17 | 1.80 |
| c) Unplanned interruptions Transpower (Class D) | - | - | 0.01 | 0.20 | - | - |

| Total CAIDI (Classes B & C) | 243 | 243 | 47 | 48 | 85 | 67 |
| CAIDI | | | | | |
| a) Planned interruptions (Class B) | 191 | 191 | 160 | 154 | 141 | 172 |
| b) Unplanned interruptions (Class C) | 52 | 52 | 40 | 43 | 79 | 56 |
| c) Unplanned interruptions Transpower (Class D) | - | - | 3 | 22 | - | - |



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Online Sources for this page:

VUW Te Waharoa — PDF NZ Gazette 2007, No 34


Gazette.govt.nz — PDF NZ Gazette 2007, No 34




✨ LLM interpretation of page content

🏗️ Energy Delivery Efficiency Performance Measures and Statistics (continued from previous page)

🏗️ Infrastructure & Public Works
Energy efficiency, Load factor, Loss ratio, Capacity utilisation, System length, Circuit length, Transformer capacity, Maximum demand, Electricity supply, Retailers