✨ Electricity Information Disclosure
25 NOVEMBER 2013 NEW ZEALAND GAZETTE, No. 155 4371
1 The Electricity Information Disclosure Requirements¹
(For 12 months ending 30 June 2013, 2012, 2011 and 2010)
Part 4
Energy Delivery Efficiency Performance Measures and Statistics
(Disclosure under Requirement 20)
1. Energy delivery efficiency performance measures
(a) Load factor (%): 68.45 | 65.51 | 69.47 | 68.49
Electrical energy entering the transmission system as percentage of maximum demand times hours per year
(b) Loss ratio (%): 3.33 | 3.76 | 3.79 | 3.72
Transmission losses as percentage of energy entering the system
(c) Capacity utilisation (%): 43.83 | 47.34 | 45.28 | 46.27
Maximum demand as percentage of total transformer capacity
2. Statistics
(a) System length, by voltage (km)
| 2012/13 | 2011/12 | 2010/11 | 2009/10 | |
|---|---|---|---|---|
| Totalᵃ | 17,405 | 17,094 | 17,198 | 17,348 |
| 350 kV (HVDC) | 1,222 | 611 | 611 | 611 |
| 270 kV (HVDC) | - | 611 | 611 | 611 |
| 0 kV (HVDC earth electrode) | 31 | 31 | 31 | 31 |
| 220 kV (HVAC) | 9,125 | 8,639 | 8,642 | 8,642 |
| 110 kV (HVAC) | 6,082 | 6,157 | 6,152 | 6,302 |
| 66/50/33/11 kV (HVAC)ᵃ | 944 | 1,045 | 1,151 | 1,151 |
(b) Circuit length of overhead electric lines, by voltage (km)
| 2012/13 | 2011/12 | 2010/11 | 2009/10 | |
|---|---|---|---|---|
| Totalᵃ | 17,283 | 17,003 | 17,108 | 17,256 |
| 350 kV (HVDC) | 1,142 | 571 | 571 | 571 |
| 270 kV (HVDC) | - | 571 | 571 | 571 |
| 0 kV (HVDC earth electrode) | 31 | 31 | 31 | 31 |
| 220 kV (HVAC) | 9,095 | 8,639 | 8,642 | 8,642 |
| 110 kV (HVAC) | 6,072 | 6,146 | 6,142 | 6,290 |
| 66/50/33/11 kV (HVAC)ᵇ | 943 | 1,045 | 1,151 | 1,151 |
(c) Total circuit length of underground cables (km)
| 2012/13 | 2011/12 | 2010/11 | 2009/10 | |
|---|---|---|---|---|
| 220 kV (HVAC) | 30 | - | - | - |
| 110 kV (HVAC) | 11 | 11 | 11 | 11 |
| 66 kV (HVAC) | 1 | 1 | - | - |
| HVDC link submarine power cables | ||||
| 350 kV (HVDC)ᵉ | 80 | 40 | 40 | 40 |
| 270 kV (HVDC) | - | 40 | 40 | 40 |
(d) Transformer capacity (kVA): 14.82x10⁶ | 14.61x10⁶ | 14.51x10⁶ | 14.26x10⁶
(e) Maximum demand (kilowatts)ᵇᶜ (kW): 6.49x10⁶ | 6.92x10⁶ | 6.57x10⁶ | 6.60x10⁶
(f) Total electricity entering the system (before losses)ᵇᶜ (kWh): 39.94x10⁹ | 39.70x10⁹ | 39.98x10⁹ | 39.56x10⁹
(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:ᵇᶜᵈ (kWh): 37.64x10⁹ | 38.21x10⁹ | 38.47x10⁹ | 38.10x10⁹
(h) Total connected customers: 53 | 53 | 53 | 53
Notes
ᵃ Excludes 61 km of circuits leased from others and operated by Transpower.
ᵇ To 2 decimal places only, higher accuracy used in calculations.
ᶜ For all years, figures for maximum demand kW and kWh injected and supplied include loads on circuits leased from 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.
ᵈ Including sales to direct connected customers
ᵉ Three cables of 40 km length configured as two poles operate at 350 kV DC.
¹ Electricity Information Disclosure Requirements issued 31 March 2004 as amended by the Electricity Information Disclosure Amendment Requirements 2004, 2006, 2007, 2008, 2008 (No2), and 2008 (No3).
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NZ Gazette 2013, No 155
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Electricity Information Disclosure Requirements
(continued from previous page)
💰 Finance & RevenueEnergy Delivery Efficiency, Transmission Statistics, Electrical Energy, System Length, Circuit Length, Transformer Capacity, Maximum Demand, Electricity Supply