BUSINESSES
SOME AMENDMENTS TO
INFORMATION FOR DISCLOSURE
FOR THE 2005/2006 FINANCIAL YEAR
PURSUANT TO
SECTION 57T OF THE COMMERCE ACT 1986
Requirement 21 (Schedule 1, Part 5)
Reliability Performance Measures
Year ended 31 March 2006
Interruptions 2007/10 2007 2006 2005 2004 2003
Target Target
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:
a) 3 Hours (%) 25.23% 26.00% 43.00% 29.00%
b) 24 Hours (%) 0.46% 0.96% 1.72% 0.39%
Faults 2007/10 2007 2006 2005 2004 2003
Target Target
Faults/100km
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
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
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
*2 substation equipment faults are now classed as underground 33kV faults
2007/10 2007 2006 2005 2004 2003
Reliability Measures Target Target
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 - -
Requirement 20 (Schedule 1, Part 4)
Year ended 31 March 2006
Energy Delivery Efficiency Performance Measures 2006 2005 2004 2003
a) Load Factor 62.92 63.45 65.81 59.11
b) Loss Ratio 6.33% 5.82% 4.52% 5.17%
c) Capacity Utilisation 31.56% 31.28% 29.44% 29.96%
Energy Delivery Efficiency Performance Measures 2006 2005 2004 2003
a) Systems Length (kms)
~ 33kV 429 427 426 337
~ 11kV 4,457 4,475 4,477 3,145
~ 230/400V 4,431 4,363 4,270 2,561
Total 9,317 9,264 9,173 6,043
b) Circuit Length (Overhead) (kms)
~ 33kV 389 394 395 312
~ 11kV 3,836 3,866 3,869 2,692
~ 230/400V 1,632 1,639 1,646 675
Total 5,856 5,899 5,910 3,679
c) Circuit Length (Underground) (kms)
~ 33kV 40 32 31 25
~ 11kV 621 610 608 453
~ 230/400V 2,800 2,724 2,624 1,886
Total 3,461 3,366 3,263 2,364
d) Transformer Capacity (kVA) 975,000 965,439 940,500 727,931
e) Maximum Demand (kW) 307,724 302,014 276,884 218,070
f) Total Electricity entering the network (before losses) (kWh) 1,696,095,881 1,678,730,000 1,596,108,000 1,170,556,066
g) Total electricity supplied for each Retailer (kWh) 1,606,525,174 1,581,079,000 1,523,885,000 1,110,069,995
Retailer A 555,579,599 550,648,000 578,884,000 599,690,446
Retailer B 146,121,137 86,037,000 48,441,000 17,748,204
Retailer C 95,283,713 137,490,000 145,489,000 91,845,438
Retailer D - - -
Retailer E 404,508,895 407,285,000 434,831,000 192,679,424
Retailer F 208,556,826 220,718,000 188,639,000 148,798,871
Retailer G - - -
Retailer H - - -
Retailer I - - -
Retailer J 178,633,012 169,098,000 118,259,000 45,063,316
Retailer K 17,841,992 9,804,000 9,342,000 14,244,296
h) Total customers 104,578 103,347 102,299 76,469
Note:
The information for the year ending 31 March 2003 has been time-weighted to reflect the acquisition of Taupo and Rotorua distribution assets from United Networks Limited.
2003 has been restated for f) and g) to align with definitions of energy pre and post distribution losses.