The Electricity Information Disclosure Regulations 1999

(For 12 months ending 30 June 2003, 30 June 2002, 30 June 2001, 30 June 2000)

Part 4

Energy Delivery Efficiency Performance Measures and Statistics

(Disclosure under Regulation 21)

1. Energy delivery efficiency performance measures

   (a) Load factor
   Electrical energy entering the transmission system as percentage of maximum demand times hours per year
   | % |
   |--------|
   | 70.50 | 2002/03 |
   | 67.09 | 2001/02 |
   | 68.67 | 2000/01 |
   | 69.08 | 1999/00 |

   (b) Loss ratio
   Transmission losses as percentage of energy entering the system
   | % |
   |--------|
   | 4.36 | 2002/03 |
   | 2.90 | 2001/02 |
   | 4.65 | 2000/01 |
   | 3.97 | 1999/00 |

   (c) Capacity utilisation
   Maximum demand as percentage of total transformer capacity #
   | % |
   |--------|
   | 69.86 | 2002/03 |
   | 70.71 | 2001/02 |
   | 71.00 | 2000/01 |
   | 69.11 | 1999/00 @ |

2. Statistics

   (a) System length, broken down by voltage

   Total	km	17,134	2002/03
   350 kV (HVDC)	km	611
   270 kV (HVDC)	km	611
   0 kV (HVDC earth electrode)	km	31
   220 kV (HVAC)	km	8,357
   110 kV (HVAC)	km	6,076
   66/50/33/11 kV	km	1,449
   		17,145	2001/02
   		611
   		611
   		31
   		8,357
   		6,108
   		1,428
   		17,288	2000/01
   		611
   		611
   		31
   		8,357
   		6,134
   		1,545
   		17,542	1999/00
   		611
   		611
   		31
   		8,365
   		6,212
   		1,712

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

   Total	km	17,049	2002/03
   350 kV (HVDC)	km	571
   270 kV (HVDC)	km	571
   0 kV (HVDC earth electrode)	km	31
   220 kV (HVAC)	km	8,357
   110 kV (HVAC)	km	6,071
   66/50/33/11 kV	km	1,449
   		17,060	2001/02
   		571
   		571
   		31
   		8,357
   		6,103
   		1,428
   		17,203	2000/01
   		571
   		571
   		31
   		8,357
   		6,129
   		1,545
   		17,457	1999/00
   		571
   		571
   		31
   		8,365
   		6,207
   		1,712

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

   | 350 kV (HVDC) | km | 40 | 2002/03 |
   | 270 kV (HVDC) | km | 40 | |

   (c) Total circuit length of underground electric lines
   (110 kV HVAC)
   | | km | 5 | 2002/03 |

   (d) Transformer capacity
   (kilovolt amperes) #
   | | kVA | 8.64x10^5 | 2002/03 |
   | | | 8.59x10^5 | 2001/02 |
   | | | 8.53x10^5 | 2000/01 |
   | | | 8.43x10^5 | 1999/00 |

   (e) Maximum demand
   (kilowatts) *
   | | kW | 6.04x10^5 | 2002/03 |
   | | | 6.07x10^5 | 2001/02 |
   | | | 6.05x10^5 | 2000/01 |
   | | | 5.83x10^5 | 1999/00 |

   (f) Total electricity entering the system (before losses of electricity), in kilowatt hours *
   | | kWh | 37.28x10^9 | 2002/03 |
   | | | 35.70x10^9 | 2001/02 |
   | | | 36.42x10^9 | 2000/01 |
   | | | 35.28x10^9 | 1999/00 |

   (g) The 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 *
   | | kWh | 35.65x10^9 | 2002/03 |
   | | | 34.66x10^9 | 2001/02 |
   | | | 34.72x10^9 | 2000/01 |
   | | | 33.88x10^9 | 1999/00 |

   (h) Total connected customers
   | | | 48 | 2002/03 |
   | | | 49 | 2001/02 |
   | | | 50 | 2000/01 |
   | | | 54 | 1999/00 |

   • to 2 decimal places only, higher accuracy used in calculations

     Installed transformer capacity based on ONAN ratings.

     @ 1999/00 calculation corrected.