New Zealand Gazette – 2009 – No. 172

Page 4198

✨ Electricity Statistics



The Electricity Information Disclosure Requirements

(For 12 months ending 30 June 2009, 2008, 2007, 2006)

Part 4

Energy Delivery Efficiency Performance Measures and Statistics

(Disclosure under Requirement 20)

1. Energy delivery efficiency performance measures

2008/09 2007/08 2006/07 2005/06
(a) Load factor (%)
Electrical energy entering the transmission system as percentage of maximum demand times hours per year 67.02 68.35 66.60 66.50
(b) Loss ratio (%)
Transmission losses as percentage of energy entering the system 4.02 3.66 3.74 3.63
(c) Capacity utilisation (%)
Maximum demand as percentage of total transformer capacity (Maximum Continuous Ratings) 48.93 48.10 50.37 51.61

2. Statistics

2008/09 2007/08 2006/07 2005/06
(a) System length, broken down by voltage (km)
Total 17,340 17,333 17,334 17,248
350 kV (HVDC) 611 611 611 611
270 kV (HVDC) 611 611 611 611
0 kV (HVDC earth electrode) 31 31 31 31
220 kV (HVAC) 8,632 8,631 8,617 8,611
110 kV (HVAC) 6,304 6,298 6,299 6,219
66/50/33/11 kV (HVAC) 1,151 1,151 1,165 1,165
(b) Circuit length of overhead electric lines, broken down by voltage (km)
Total 17,255 17,248 17,249 17,163
350 kV (HVDC) 571 571 571 571
270 kV (HVDC) 571 571 571 571
0 kV (HVDC earth electrode) 31 31 31 31
220 kV (HVAC) 8,632 8,631 8,617 8,611
110 kV (HVAC) 6,299 6,293 6,294 6,214
66/50/33/11 kV (HVAC) 1,151 1,151 1,165 1,165

Note:

  • HVDC link submarine power cables measure approximately 80km. Broken down by voltage.
  • 350 kV (HVDC) | 40 | 40 | 40 | 40 |
  • 270 kV (HVDC) | 40 | 40 | 40 | 40 |
    | | | | | |
    | (c) Total circuit length of underground electric lines (km) |
    | (110 kV HVAC) | 4 | 4 | 4 | 4 |
    | (d) Transformer capacity (Maximum Continuous Ratings) (KVA) | 14.09 x 10⁶ | 13.80 x 10⁶ | 13.31 x 10⁶ | 12.88 x 10⁶ |
    | (e) Maximum demand (Kilowatts) |
    | BC (kW) | 6.61 x 10⁶ | 6.64 x 10⁶ | 6.71 x 10⁶ | 6.65 x 10⁶ |
    | (f) Total electricity entering the system (before losses) BC (kWh) |
    | | 33.82 x 10⁹ | 39.72 x 10⁹ | 39.13 x 10⁹ | 38.73 x 10⁹ |
    | (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) |
    | | 37.26 x 10⁹ | 38.27 x 10⁹ | 37.66 x 10⁹ | 37.33 x 10⁹ |
    | (h) Total connected customers | 51 | 49 | 48 | 47 |

Notes

a. Excludes 6 km of circuits leased from others and operated by Transpower, and 31 km owned by Transpower but operated by others.
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 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.
d. Including sales to direct connected customers.

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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Gazette.govt.nz — PDF NZ Gazette 2009, No 172




✨ LLM interpretation of page content

🏗️ Transpower New Zealand Limited Lines Business Annual Depreciated Historic Cost Reconciliation Report (continued from previous page)

🏗️ Infrastructure & Public Works
Electricity, Transmission, Statistics, Efficiency, System Performance