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New Zealand Gazette – 2012 – No. 152

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✨ Energy Reliability Statistics

21 DECEMBER 2012

NEW ZEALAND GAZETTE, No. 152

4527

VECTOR LIMITED & SUBSIDIARIES

GAS DISTRIBUTION ACTIVITIES

RELIABILITY PERFORMANCE MEASURES (UNAUDITED)

FOR THE YEAR ENDED 30 JUNE 2012

	2012	2011	2010	2009
5 Reliability performance measures
Unplanned distribution system interruptions not related to unplanned transmission system interruptions (hours/customer) [1]	0.0163	0.0114	0.0259	0.0072
Unplanned distribution system interruptions related to unplanned transmission system interruptions (hours/customer) [2]	3.928	-	-	-

This information has been compiled using gas outage records from Vector\'s Customer Management system that was unaudited at the time of preparation.
The 2012 transmission outages have resulted from incidents on transmission assets or other (upstream) facilities that are not part of Vector\'s gas transmission system, but due to the interconnected and interdependent nature of the transmission system, resulted in interruptions to customers served by the Vector gas transmission system. In each case curtailment of service to customers has been at the direction of the Critical Contingency Operator. This information has been compiled using estimated information. The methodology used to calculate this estimated information is:

(a) The Critical Contingency Operator provided information on the timing of Vector directions to curtail and restore demand to curtailment bands 2-6 during the Maui critical contingency (25-30 October 2011), and the number of customers affected in each curtailment band.

(b) For each curtailment band, the duration of the unplanned interruption for that curtailment band was multiplied by the number of customers (based on the information provided by the Critical Contingency Operator).

Gazette.govt.nz — NZ Gazette 2012, No 152

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✨ LLM interpretation of page content

🏭 Reliability Performance Measures for Vector Limited & Subsidiaries (continued from previous page)

Domain🏭 Trade, Customs & Industry
KeywordsEnergy reliability, Gas distribution, Performance measures, Statistics, Vector Limited, Subsidiaries

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