New Zealand Gazette – 2006 – No. 149

Page 4327

✨ Electricity Transmission Statistics



The Electricity Information Disclosure Requirements 2004

(For 12 months ending 30 June 2006, 2005, 2004, 2003)

Part 4

Energy Delivery Efficiency Performance Measures and Statistics

(Disclosure under Requirement 20)

1. Energy delivery efficiency performance measures

(a) Load factor

Electrical energy entering the transmission system as percentage of maximum demand times hours per year

2005/06 2004/05 2003/04 2002/03
% 66.50 65.31 — 70.50

(b) Loss ratio

Transmission losses as percentage of energy entering the system

2005/06 2004/05 2003/04 2002/03
% 3.63 3.76 2.82 4.35

(c) Capacity utilisation

Maximum demand as percentage of total transformer capacity

Based on Maximum Continuous Ratings

2005/06 2004/05 2003/04 2002/03
% 51.61 — — 50.81

2. Statistics

(a) System length, broken down by voltage

Voltage 2005/06 (km) 2004/05 (km) 2003/04 (km) 2002/03 (km)
Total * 17,248 17,045 17,041 17,134
350 kV (HVDC) km 611 611 611 611
270 kV (HVDC) km 611 611 611 611
0 kV (HVDC earth electrode) km 31 31 31 31
220 kV (HVAC) km 8,611 8,376 8,376 8,357
110 kV (HVAC) km 6,219 6,214 6,207 6,076
66/50/33/11 kV (HVAC) * km 1,165 1,202 1,205 1,449

NB: HVDC link submarine power cables measure approximately 80km. Broken down by voltage

Voltage 2005/06 (km) 2004/05 (km) 2003/04 (km) 2002/03 (km)
350 kV (HVDC) km 40 40 40 40
270 kV (HVDC) km 40 40 40 40

(b) Circuit length of overhead electric lines, broken down by voltage

Voltage 2005/06 (km) 2004/05 (km) 2003/04 (km) 2002/03 (km)
Total * km 17,163 16,681 16,710 17,049
350 kV (HVDC) km 571 571 571 571
270 kV (HVDC) km 571 571 571 571
0 kV (HVDC earth electrode) km 31 31 31 31
220 kV (HVAC) km 8,611 8,376 8,376 8,357
110 kV (HVAC) km 6,214 6,146 6,148 6,071
66/50/33/11 kV (HVAC) * km 1,165 1,139 1,539 1,449

(c) Total circuit length of underground electric lines

Voltage 2005/06 (km) 2004/05 (km) 2003/04 (km) 2002/03 (km)
110 kV HVAC km 5 5 5 5

(d) Transformer capacity (kilovolt amperes)

2005/06 2004/05 2003/04 2002/03
Maximum Continuous Ratings kVA 12.88 x 10^6 12.87 x 10^6 11.7 x 10^6 11.87 x 10^6

(e) Maximum demand (kilowatts) †

2005/06 2004/05 2003/04 2002/03
kW 6.65 x 10^6 6.2 x 10^6 6.13 x 10^6 6.04 x 10^6

(f) Total electricity entering the system (before losses of electricity), in kilowatt hours: ‡

2005/06 2004/05 2003/04 2002/03
kWh 38.73 x 10^9 38.71 x 10^9 39.4 x 10^9 37.73 x 10^9

(g) Total amount of electricity (in kilowatt hours) supplied from the system (after losses of electricity) during the financial year on behalf of each person that is an electricity generator or an electricity retailer, or both: §

2005/06 2004/05 2003/04 2002/03
kWh 37.33 x 10^9 37.30 x 10^9 36.5 x 10^9 36.55 x 10^9

(h) Total connected customers

2005/06 2004/05 2003/04 2002/03
47 46 48 45
  • To 2 decimal places only, higher accuracy used in calculations.

∅ Including sales to direct connected customers.

& 2005/06, 2004/05, 2003/04 data excludes 61 km of circuits leased from others and operated by Transpower. 34km owned by Transpower but operated by others not included above.

† For all years, figures for maximum demand kW and kWh injected and supplied include loads on circuits leased by Transpower. The effect of these circuits cannot be measured as metering equipment is not installed at the inter-connection points with Transpower-owned assets, but the difference is estimated to be no more than 0.1% of totals. Loads on Transpower assets leased to others are not included as Transpower does not collect operational data for these assets.



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Online Sources for this page:

VUW Te Waharoa — PDF NZ Gazette 2006, No 149


Gazette.govt.nz — PDF NZ Gazette 2006, No 149




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Electricity, Transmission, Efficiency, Statistics, Performance Measures