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Weekly Update sent on 7 September 2021
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Security of Supply

National hydro storage decreased two percentage points this week to 115% of average for the time of year (71% of full). Moderately below average inflows were seen in both islands over the last seven days.

North Island storage decreased two percentage points to 80% of the historical average, and South Island storage also decreased by two percentage points to 120% of the historical average.

Weekly Demand

Demand was up 2% on last week at 774 GWh. The highest peak occurred at 6:30pm on the Tuesday 31st at 6,251 MW. 

Generation Mix

Total generation was 809 GWh this week, with hydro making up 62%, and thermal 9% of the mix. Wind generation was average at 56 GWh, or 7% of the mix; a slight increase on last week.

Weekly Prices

The average price at Haywards was $88/MWh, up 36% from $64/MWh last week. Near $0 prices were seen in the early hours of Monday morning and for two trading periods early on Sunday. Due to national demand around 3,200 MW, this was lower than the lowest points on other days of the week by around 200MW. At the same time high wind generation in the 450-500 MW range was also seen.


HVDC transfer was Northward throughout the week with a brief exception lasting two trading periods early Monday morning.

Fact of the Week

Electric charge travels at the speed of light, approximately 300,000km per second.


Go to Security of Supply web page

Next Report

The next scheduled Market Operations weekly report is due Tuesday 14 September 2021.

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