26 NOVEMBER NEW ZEALAND GAZETTE 4285

Part 4 of Schedule 1

1 Energy delivery efficiency performance measures:

(a) Load Factor
Year Ended 31-Mar-99 68%
Year Ended 31-Mar-98 66%
Year Ended 31-Mar-97 66%
Year Ended 31-Mar-96 67%

(b) Loss Ratio
Year Ended 31-Mar-99 6%
Year Ended 31-Mar-98 7%
Year Ended 31-Mar-97 7%
Year Ended 31-Mar-96 7%

(c) Capacity utilisation
Year Ended 31-Mar-99 35%
Year Ended 31-Mar-98 37%
Year Ended 31-Mar-97 39%
Year Ended 31-Mar-96 40%

2 Statistics

(a) System Length (km)
66kV: Year Ended 31-Mar-99 35, Year Ended 31-Mar-98 34, Year Ended 31-Mar-97 24, Year Ended 31-Mar-96 24
33kV: Year Ended 31-Mar-99 88, Year Ended 31-Mar-98 87, Year Ended 31-Mar-97 24, Year Ended 31-Mar-96 27
33/11kV: Year Ended 31-Mar-99 95, Year Ended 31-Mar-98 78, Year Ended 31-Mar-97 62, Year Ended 31-Mar-96 61
11kV: Year Ended 31-Mar-99 1288, Year Ended 31-Mar-98 1294, Year Ended 31-Mar-97 1281, Year Ended 31-Mar-96 1304
11/11kV: Year Ended 31-Mar-99 19, Year Ended 31-Mar-98 19, Year Ended 31-Mar-97 35, Year Ended 31-Mar-96 34
11kV/400V: Year Ended 31-Mar-99 52, Year Ended 31-Mar-98 52, Year Ended 31-Mar-97 52, Year Ended 31-Mar-96 49
33kV/11kV/400V: Year Ended 31-Mar-99 142, Year Ended 31-Mar-98 142, Year Ended 31-Mar-97 113, Year Ended 31-Mar-96 113
11kV/11kV/400V: Year Ended 31-Mar-99 6, Year Ended 31-Mar-98 6, Year Ended 31-Mar-97 6, Year Ended 31-Mar-96 5
Total: Year Ended 31-Mar-99 1726, Year Ended 31-Mar-98 1713, Year Ended 31-Mar-97 1598, Year Ended 31-Mar-96 1618

(b) Circuit Length (Overhead)
66kV: Year Ended 31-Mar-99 47, Year Ended 31-Mar-98 47, Year Ended 31-Mar-97 24, Year Ended 31-Mar-96 24
33kV: Year Ended 31-Mar-99 190, Year Ended 31-Mar-98 172, Year Ended 31-Mar-97 92, Year Ended 31-Mar-96 93
11kV: Year Ended 31-Mar-99 1451, Year Ended 31-Mar-98 1440, Year Ended 31-Mar-97 1508, Year Ended 31-Mar-96 1461
400V: Year Ended 31-Mar-99 142, Year Ended 31-Mar-98 142, Year Ended 31-Mar-97 113, Year Ended 31-Mar-96 109
Total Overhead: Year Ended 31-Mar-99 1830, Year Ended 31-Mar-98 1801, Year Ended 31-Mar-97 1737, Year Ended 31-Mar-96 1687

(c) Circuit Length - (Underground)
33kV: Year Ended 31-Mar-99 0, Year Ended 31-Mar-98 0, Year Ended 31-Mar-97 0, Year Ended 31-Mar-96 0
11kV: Year Ended 31-Mar-99 27, Year Ended 31-Mar-98 27, Year Ended 31-Mar-97 28, Year Ended 31-Mar-96 27
400V: Year Ended 31-Mar-99 59, Year Ended 31-Mar-98 59, Year Ended 31-Mar-97 59, Year Ended 31-Mar-96 59
Total Underground: Year Ended 31-Mar-99 86, Year Ended 31-Mar-98 86, Year Ended 31-Mar-97 87, Year Ended 31-Mar-96 86

(d) Westpower Transformer Capacity (KVA)
District (zone) Substations: Year Ended 31-Mar-99 71000, Year Ended 31-Mar-98 71000, Year Ended 31-Mar-97 71000, Year Ended 31-Mar-96 71000
Distribution Substations: Year Ended 31-Mar-99 97843, Year Ended 31-Mar-98 93927, Year Ended 31-Mar-97 93925, Year Ended 31-Mar-96 88319
Total Substations: Year Ended 31-Mar-99 168843, Year Ended 31-Mar-98 164927, Year Ended 31-Mar-97 164925, Year Ended 31-Mar-96 159319

(e) Maximum Demand
Date: 6-Apr-98, 17-Nov-97, 2-Aug-96, 7-Sep-95
Half hour ending: 10:00, 17:30, 09:00, 10:00
System Maximum (kW): 33906, 34989, 36683, 35141

(f) Total electricity supplied from the system (kWh)
Year Ended 31-Mar-99 185657664
Year Ended 31-Mar-98 188888451
Year Ended 31-Mar-97 195620912
Year Ended 31-Mar-96 192326559

(g) Electricity conveyed on behalf of other retailers (kWh)
Year Ended 31-Mar-99 28548085
Year Ended 31-Mar-98 0
Year Ended 31-Mar-97 14760252
Year Ended 31-Mar-96 10478172

(h) Total customers
Year Ended 31-Mar-99 11329
Year Ended 31-Mar-98 11358
Year Ended 31-Mar-97 11373
Year Ended 31-Mar-96 11355

Part 5 of Schedule 1

Reliability Performance Measures

1 Total number of interruptions

Class A - Planned interruptions caused by TransPower: Year Ended 31-Mar-99 0, Year Ended 31-Mar-98 3, Year Ended 31-Mar-97 1, Year Ended 31-Mar-96 0
Class B - Planned interruptions by Westpower: Year Ended 31-Mar-99 120, Year Ended 31-Mar-98 126, Year Ended 31-Mar-97 88, Year Ended 31-Mar-96 71
Class C - Unplanned interruptions by Westpower: Year Ended 31-Mar-99 70, Year Ended 31-Mar-98 91, Year Ended 31-Mar-97 89, Year Ended 31-Mar-96 135
Class D - Unplanned interruptions by TransPower: Year Ended 31-Mar-99 3, Year Ended 31-Mar-98 4, Year Ended 31-Mar-97 5, Year Ended 31-Mar-96 6
Class E - Unplanned interruptions by ECNZ Generation: Year Ended 31-Mar-99 0, Year Ended 31-Mar-98 0, Year Ended 31-Mar-97 0, Year Ended 31-Mar-96 0
Class F - Unplanned interruptions by Westpower Generation: Year Ended 31-Mar-99 0, Year Ended 31-Mar-98 1, Year Ended 31-Mar-97 0, Year Ended 31-Mar-96 10
Class G - Other interruptions (planned Westpower Generation): Year Ended 31-Mar-99 0, Year Ended 31-Mar-98 1, Year Ended 31-Mar-97 0, Year Ended 31-Mar-96 0
Total interruptions: Year Ended 31-Mar-99 193, Year Ended 31-Mar-98 226, Year Ended 31-Mar-97 183, Year Ended 31-Mar-96 222