New Zealand Gazette – 1999 – No. 118

Page 2837

✨ Energy Regulation Notices



13 SEPTEMBER NEW ZEALAND GAZETTE

Regulation 19

Use of estimated information in certain cases

If any information (for Regulation 17 or 18) is not available, the pipeline owner may use estimated information for that purpose and, in that case, (i) identify the information that has been compiled using estimated information; and (ii) state the methodology used to calculate the estimated information.

1. UFG %:

In determining the unaccounted-for gas, the sales component includes a portion which is unbilled gas. This portion involves a small estimate for the number of days during the financial year where the billing reading dates do not correspond with the sales gate reading dates. This generally only affects domestic customers’ sales, the estimate being based on the daily average usage of the preceding billing period. A computer program is run monthly to compute this unbilled gas, for the preceding three months’ periods, such that the oldest period then contains the smallest error.

For 98-99, there have been problems in running this program, and some months have contained suspect results. These periods of suspect data have been excluded from the UFG% calculations.

This data has been shown by a ~.

2. Unplanned Interruption Measure:

The customer-hours lost have been estimated in a number of ways:

(i) On systems where the number of customers affected and the length of the interruption have been recorded, but are not available for the full financial year, this data has been extrapolated such that it would then cover the full 12 month period. As the specific system involved has not been recorded, the estimated customer-hours lost in total has been apportioned across system(s) indicated by the local engineer as being the contributing system(s), the apportionment being on a pro-rata basis by system length.

This data has been shown by a #.

(ii) On systems where the number of customers affected has been recorded, but the length of each interruption has not been recorded, the local engineer has estimated the average length of the interruptions. The specific system involved is recorded.

This data has been shown by a ^.

(iii) On systems where the number of customers affected has been recorded, but the length of each interruption has not been recorded, the local engineer has estimated the average length of the interruptions. As the specific system involved has not been recorded, the estimated customer-hours lost in total has been apportioned across system(s) indicated by the local engineer as being the contributing system(s), the apportionment being on a pro-rata basis by system length.

This data has been shown by a *.



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✨ LLM interpretation of page content

🏭 Energy delivery reliability performance measures and statistics (continued from previous page)

🏭 Trade, Customs & Industry
Energy reliability, Unplanned interruptions, Distribution system, Transmission system, Customer-hours lost