Security of Supply

Hydro storage in both islands has continued to decline over the last week, with South Island at 98% of average, and North Island at 63% of average. The North Island levels are low but this is typically the time of year where inflows begin to increase in the North Island, and there is rain forecast for this weekend.

The Pohokura offshore outage was completed on Monday 6thApril, eight days ahead of schedule thanks to good weather, calm sea-state and good subsea visibility. This brings Pohokura up to full production capacity.

Demand has stabilised during the lockdown period with the exception of some large industrial loads that are still ramping down. We are currently meeting regularly with relevant stakeholders to manage potential effects of this. Please see our COVID-19 Response webpage for more information. Our focus is now turning to what the post-lockdown situation could look like and the return to normal.

We are planning scenario updates for the next Electricity Risk Curves to take account of COVID-19 related effects, particularly the impact on demand.

The review of comments on the Annual Security of Supply Draft is continuing and the report will be published by the end of April. In addition please click here to view our consultation on the proposed change to the due date for the Annual Security of Supply Assessment for next year. This is to streamline Transpower’s internal processes. 

Electricity Risk Curves

Further information here.

New Zealand and South Island storage are both in the Normal range.


Hydro Information

Further information here.

Storage decreased in the North Island and the South Island over the last week, with South Island storage at 82% of full and North Island storage at 28% of full.


Market Indicators

Further information here.

Renewable generation over the last seven days was 86% of total generation, with hydro generation accounting for 48% of total generation.


Policies and Publications

Includes information on the Annual Assessment and Transpower policies related to Security of Supply: the SoSFIP, EMP, and SOROP.



Invitation to Comment: Draft Security of Supply Forecasting and Information Policy