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Weekly Update sent on 19 October 2021
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Security of Supply

National hydro storage has increased marginally this week to 130% of average for the time of year (78% of full). North Island storage increased two percentage points to 121% of the historical average, and South Island storage remained at 131% of the historical average.

Average inflows were observed across the motu.

Weekly Demand

National weekly demand was 761 GWh, an increase of 18 GWh (two percent) on the previous week. 

This week's national demand peak was 5,854 MW and occurred at 8.30am on Wednesday 13 September.

Generation Mix

Total generation was 798 GWh this week, with hydro making up 63% and thermal just 7% of the mix. Wind generation comprised 8% of the mix. The total contribution of renewable energy to New Zealand's national grid was 90.6%.

Weekly Prices

The average price at Haywards was $66/MWh, little changed from $67/MWh last week. 

Prices at Haywards peaked at $488/MWh at 10.30am on Wednesday 13 September. This coincided with a cold temperature day seen across the motu and minimal wind generation.

The week has seen a run of low overnight prices due to an abundance of wind and hydro generation.


HVDC transfer remained Northward throughout the week but with a reduced magnitude compared with the previous week.

Fact of the Week

The world's highest transmission tower is located at Mount Damaoshan in Zhoushan City, China and stands 370 metres tall with a weight of 5,443 tonnes.


Go to Security of Supply web page

Next Report

The next scheduled Market Operations weekly report is due Tuesday 26 October 2021.

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