Impact of the Breaches. 4.1 The Parties agreed that the market impact should be recorded as negligible.
Impact of the Breaches. 4.1 There is also an impact on each consumer who pays monthly lease fees for an uncertified metering installation. However, there is an off-set of those lease fee costs for the customers because both Electricity Invercargill and TPC are community owned, and return a portion of their profits to consumers.
Impact of the Breaches. 4.1 The investigator considers there was no quantifiable market impact in relation to the circumstances. However, consumer protection and the promotion and benefit of competition for consumers is at the forefront of the work of the Authority. Saves and win-backs inhibit retail competition, resulting in higher prices being paid by consumers than they would in a more competitive market.
Impact of the Breaches. Event 1: Greytown transformer T3 tripping
Impact of the Breaches. 4.1 The parties agreed that the market impact as assessed by the Investigator should be recorded as minor and addressed by the private settlement between Alpine and the non-participant.
Impact of the Breaches. 4.1 Final Pricing was affected for 1,644 Trading Periods due to the Grid Owner calculating and providing incorrect metering information to the Pricing Manager. Although the Grid Owner always provided correct metering information to the Reconciliation Manager for reconciliation and settlement purposes, the incorrect final pricing (which was calculated on the incorrect metering information provided to the Pricing Manager) was applied to this reconciliation information for settlement.
Impact of the Breaches. 4.1 The incident caused a loss of supply of 44 MW from Southbrook and Kaiapoi substations.
Impact of the Breaches. 4.1 There could be a minor market impact. The results of the statistical sampling showed the vast majority of these meters are within the prescribed variance. However, the results also showed a bias towards running slowly during times of low load, with only a few meters marginally outside the level of tolerance for meters running fast. When tested at high load the sample results appeared more accurate.
Impact of the Breaches. 4.1 Alpine has discovered inaccuracies of metering installations during statistical sampling. However, the parties consider the impact is minor.
Impact of the Breaches. 4.1 The impact of the grid owner’s breaches is that if the single d.c. supply to the trip relay failed, the HLY5 220 kV circuit breakers would not open for operation of either HLY5’s main 1 or main 2 cable connection differential protections as they should. This would mean the backup protection systems on the Huntly 220 kV connected transformers and the adjacent substation 220 kV circuits to Huntly would operate to isolate the complete Huntly 220 kV bus and disconnect further equipment.
