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Weekly Update sent on 11 August 2021
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Latest Full report available here

Summary

Security of Supply

National hydro storage dropped slightly this week to 101% of average for the time of year (65% of full),with average inflows seen over the week.  

North Island storage increased one percentage point to 71% of historical average, and South Island storage decreased one percentage point to 105% of historical average. 

Weekly Demand

National weekly demand rose 38 GWh (five percent)on the previous week. With a cold Southerly making its way over the country, load on Sunday was particularly high for a weekend - up 12% on the previous Sunday. Peak load on Sunday was 6,380 MW, with a weekday peak load of 6,552 MW on Tuesday at 18:00.

Generation Mix

Total generation was 892 GWH this week, with hydro generation making up 59%, and thermal 16% of the generation mix.  Wind generation was high at 39 GWh, or 4.4% of the mix. 

Weekly Prices

The average price at Haywards was $155/MWh, up 20% from $130/MWh last week. Prices were fairly steady, with a few deviations around a clear base price of $140-$150 /MWh. Highest prices of around $315 /MWh occurred during peak periods on Monday and Thursday mornings and Sunday evening.  

Constraints on HVDC transfer on Thursday evening and Friday led to inter-island price separation, with Benmore prices falling as low as $43/MWh on Friday afternoon.  These constraints were due to weather related salt contamination of Pole 2 at the end of the undersea cable, and the subsequent removal of this pole from the market on Friday for cleaning.

 

Go to Security of Supply web page

Next Report

The next scheduled Market Operations weekly report is due Tuesday 18 August 2021.

Transpower Website

If you have any queries, please email system.operator@transpower.co.nz.
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