National storage remains well above its long-term average at 126%. North Island storage continued to rise over the last week from 78% to 91% of average, while South Island storage declined from 135% to 130% of average.
We have finalised our review the Security of Supply Forecasting and Information Policy. We expect to release information on the final decision next week, and will hold an industry briefing following this release.
Current Situation
Aggregate New Zealand storage decreased over the last week and is at 84% of total storage, this is above the historical average (126% of average) for this time of the year.
Weekly hydro generation over the last 12 months has ranged between 54% and 66% of total generation. Last week hydro generation contributed 61% of total generation.
Hydro Storage Update
Controlled storage remains above average on the New Zealand and South Island hydro risk curves.
Inflows into Lake Taupo over the last week were higher than the historical average for the time of the year and there was an increase in North Island storage.
South Island inflows were also higher than the historical average over the last week however storage levels have decreased.
The spot price, based on available final and interim prices, has averaged $77 per MWh over the last two weeks, this is higher than prices experienced this time last year.
We periodically update the base HRC data curves and the Simulated Storage Trajectory Curves. The updated files for these are available on the Hydro Risk Curve page.
Data
Last Updated
Hydro Risk Curve Data File and Input Assumptions
21 May 2019
Simulated Storage Trajectories and Assumptions
21 May 2019
Next Report
The next scheduled weekly Security of Supply Report is due Tuesday 18 June 2019.
