Our Market Operations Weekly Report contains the latest information about the electricity market, including security of supply, wholesale price trends and system capacity.
It is published every Tuesday. Click here to receive the report via email every week.
If you have any comments or questions please contact the Market Operations Team at [email protected].
Latest Report / More Information
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Current Storage Positions
Overview
New Zealand hydro storage has increased from 102% to 104% of the historic mean for this time of year. Renewable generation was 90% of the weekly generation mix, which is less than the mean of the last 12 months of 92%.
This week’s insight looks at high nodal price and separation in Southland region.
Security of Supply and Capacity
Energy
National hydro storage has increased to 104% of the seasonal mean at the end of last week. South Island hydro storage increased from 96% to 98% of the historic mean, and North Island storage increased from 185% to 196%.
Capacity
Residuals were healthy with the lowest residual of 1402 MW occurring during the morning of Friday 10 April. Residuals were above 1000 MW throughout the week.
The N-1-G margins in the NZGB forecast are healthy through to end of May. Within seven days we monitor these more closely through the market schedules. The latest NZGB report is available on the NZGB website.
Electricity Market Commentary
Weekly Demand
Total demand increased from 710 GWh to 719 GWh for the week, slightly below the average demand at this time of year over the past three years. The highest demand peak of 5,387 MW occurred at 6:00pm on Tuesday 7 April.
Weekly Prices
The average wholesale electricity spot price at Ōtāhuhu last week was $112/MWh, decreasing from $148/MWh the week prior. Wholesale prices peaked at $276/MWh at Ōtāhuhu at 3:30pm on Wednesday 8 April.
Generation Mix
Wind generation increased from 7% to 10% of the mix. Hydro generation decreased to 52% of the mix, from 54% the week prior. Thermal generation decreased to 8% which is below its yearly average of 9% of the mix. Geothermal increased from 25% to 26% of the mix and solar contributed to 0.7% of the generation mix.
HVDC
HVDC flow last week was predominantly northward with the exception of some brief periods of overnight low southward flow. These periods coincided with periods of high wind generation and lower North Island demand. In total, 43 GWh was transferred north and 22 GWh was transferred south.
Surveys and Engagement
We have opened our Annual System Operator Participant Survey to provide an opportunity for participants to set out their expectations and help us understand how we are performing the System Operator service. If you have not received the survey but would like to have your say, you can complete it here. The survey closes 17 April 2026.