Security of Supply

National hydro storage has decreased since the last update. South Island storage is now at 95% of full and the North Island 80% of full. Renewable generation was 79% of total generation over the last 7 days.

Transpower held another industry-wide conference call on 22 January 2020 to advise on repair plans for the damaged Islington-Roxburgh line. Please see further details here.  

The first HVDC bipole outage was carried out on 18 January as planned. We are currently in a 2 week period until 1 Feb where the HVDC is in monopole (Pole 3 only) and the HVDC electrode is on an outage. The next HVDC bipole outage is scheduled for 1 February. We have previously carried out analysis for this period which can be found on our website here. We do not currently foresee any risk to security of supply..

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 increased in the South Island over the last week, with South Island storage at 95% of full and North Island storage at 80% of full.


Market Indicators

Further information here.

Renewable generation over the last seven days was 79% of total generation, with hydro generation accounting for 55% 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.



There are currently no security of supply consultations.