New Zealand Gazette – 2008 – No. 25

Page 579

✨ Electricity Reliability Statistics



15 FEBRUARY 2008
NEW ZEALAND GAZETTE, No. 25
579

6 Faults per 100 circuit-km of underground electric line:

      2007    2006    2005    2004

66kV - 1.6 1.6 0.0
33kV 3.6 4.0 4.0 4.5
11kV 2.4 2.8 3.1 3.3
All 2.4 2.7 3.1 3.2

7 Faults per 100 circuit-km of overhead electric line:

      2007    2006    2005    2004

66kV 0.8 2.5 1.0 0
33kV 3.1 2.8 3.8 1.9
11kV 13.8 13.3 11.8 10.3
All 12.5 12.0 10.8 9.3

Note:
A major snowstorm hit the South Island on 12 June 2006, severely interrupting electricity supply to customers. The following measures exclude the impact of the snowstorm. No single extreme events occurred in the previous three financial years (2004, 2005 and 2006) which had such a significant impact on the company’s reliability performance in those years.

SAIDI, SAIFI AND CAIDI by interruption class and in total for the 2007, excluding the June 2006 snowstorm is as follows:

Network or generation owner Interruption class Classification of interruptions SAIDI (minutes per connected consumer) SAIFI (interruptions per connected consumer) CAIDI (minutes per consumer interrupted)
Orion B Planned shutdowns 8.8 0.03 274
C Unplanned cuts 36.6 0.58 64
45.4 0.61 75
Transpower A Planned shutdowns 0.2 0.00 282
D Unplanned cuts 4.2 0.04 100
4.4 0.04 103
49.8 0.65 77


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Online Sources for this page:

VUW Te Waharoa — PDF NZ Gazette 2008, No 25


Gazette.govt.nz — PDF NZ Gazette 2008, No 25




✨ LLM interpretation of page content

💰 Disclosure of reliability performance measures (continued from previous page)

💰 Finance & Revenue
Reliability performance, Interruptions, Planned shutdowns, Unplanned cuts, Faults, Electric lines, Orion, Transpower