Enhanced report on EMI – Historical electricity risk curves

  • Last post 14 July 2021
Matthew Keir posted this 12 July 2021

The historical electricity risk curve report has been enhanced to provide a comparison of hydro storage (updated daily) against the full set of risk curves, boundaries, and triggers first established by the system operator in 2019.

The following curves are now available via the show parameter:

  • Risk status curves (default)
  • Percentage risk curves
  • Contingent storage release boundaries
  • Official conservation campaign triggers 
  • All curves, boundaries, and triggers (enabling a comparison of various curves)

The figure below shows the risk status curves for New Zealand. The full collection of risk curves for New Zealand and the South Island are available in a public dashboard

Historical electricity risk status curves

The data for the risk curves is available for download as a daily series via the data tab. This is a change from the previous report which only provided data on a change or at monthly resolution. The change brings all the data in the chart to daily resolution. For more information on the report see the more information tab. 

Members can add this report to their own dashboard by hitting 'Add to my dashboard' at the bottom right, or 'Follow' the public dashboard to add this to their own dashboard menu. 

Changes to the percentage risk curves over time are highlighted in several other public dashboards.

For more information on the electricity risk curves and the assumptions behind these see the system operator's website.

  • Liked by
  • Callum M
Order by: Standard | Newest | Votes
sarahafeez posted this 12 July 2021

Thanks Matthew for sharing these.

Could be a dumb question from my side but is it similar to the risk curve that transpower produces in their reports?

https://www.transpower.coRisk Curves.nz/sites/default/files/bulk-upload/documents/SOS101%20-%20Risk%20Meter.pdf

sarahafeez posted this 12 July 2021

how do we forecast the curves for 2022?

Matthew Keir posted this 13 July 2021

Hi Sarah,

Yes, these curves are produced by the Transpower in their role as system operator. The Authority maintains a record of the shortage risk the system operator presents to the market to aid our understanding and assessment of how the market responds to shortage risk. For example, the percentage risk presented over more than 10 years. The system operator is responsible for forecasting the security of supply risk and has a range of resources explaining how the curves are derived on their website via the link in the last line of the post above. 

I hope that helps to clarify things.



sarahafeez posted this 13 July 2021


Thanks Matthew for the excellent explanation.

Is it fair to assume that controlled storage is the actual NZ hydro level storage?

Something similar to published here


Matthew Keir posted this 13 July 2021

Hi Sarah,

Take a look at the 'more information' tab on the report. It should cover everything you are asking.



sarahafeez posted this 14 July 2021


Thanks Matthew, it does cover everything I was looking for.