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Current Status as at: 11 November 2018

Outlook

Over the next 8-10 weeks we expect the risk of shortage due to hydro storage to remain low (though, in the unlikely event of major equipment failures the situation could deteriorate). The Risk Meter is currently set to normal.

We are continuing to closely analyse and monitor the security of supply situation due to the ongoing outage at Pohokura, and the lower than average hydro storage for this time of year. We are currently updating the Hydro Risk Curves to account for the current TCC outage (which will increase curves for November 2018), and later this month we will update them again to include a new demand forecast. In the unlikely event that fuel supplies do not return to normal levels at the end of November, we will also be providing analysis of the thermal fuel situation and a scenario analysis.

In January and April 2018, Transpower consulted on a proposed change to the process for evaluating restrictions on thermal fuel availability as it relates to the Hydro Risk Curve input assumptions. The document published today summarises submissions to that consultation, provides Transpower’s response to those submissions and confirms our decision regarding implementation of the change. See here.

Current Situation 

Aggregate New Zealand storage increased over the last week and is at 51% of total storage, this is below the historical average (91% of average) for this time of the year.

Weekly hydro generation over the last 12 months has ranged between 48% and 71% of total generation. Last week hydro generation contributed 69% of total generation.

Hydro Storage Update

Controlled storage remains below average on the New Zealand and South Island hydro risk curves.

Inflows into Lake Taupo over the last week were lower than the historical average for the time of the year and there was a decrease in North Island storage.

South Island inflows were higher than the historical average over the last week and storage levels have increased.
View the latest Hydro Risk Curves  »
Read more about Hydro Storage  »

Generation Mix Update

Generation from non hydro sources are expected to remain at current levels.
Read more about Generation Mix  »

Demand Update

New Zealand electricity usage is about average for this time of the year.
Read more about Demand »

Transmission Update

There was a net HVDC energy transfer to the North Island of 67 GWh last week. 
Read more about Transmission »

Wholesale Prices Update

The spot price, based on available final and interim prices, has averaged $248 per MWh over the last two weeks, this is higher than prices experienced this time last year.
Read more about Wholesale Pricing »

Data Updates

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 6 November 2018
Simulated Storage Trajectories and Assumptions 8 November 2018

Next Report

The next scheduled weekly Security of Supply Report is due Tuesday 20 November 2018.

Transpower Website

If you have any queries, please email system.operator@transpower.co.nz.
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