Security of Supply

We provide regular updates on the status of hydro storage, hydro risk curves, the generation mix and wholesale pricing. We also publish various SOS policies.

SOS Weekly Reporting

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As system operator every Tuesday we update the weekly status of generation fuel required for power generation in New Zealand.

We send out weekly Security of Supply newsletters. This page contains a list of the last five newsletters. You can subscribe to the mailing list.
Hydroelectric generation contributes around 60% of New Zealand's total electricity supply, with many generators of widely varying sizes distributed throughout the country.
Hydroelectric generation contributes around 60% of New Zealand's total electricity supply. Generators varying in size and are located throughout New Zealand.
We publish a breakdown of what fuels were used to generate New Zealand's electricity over the last week.
The National Grid transports electricity from the generating stations to distribution networks and major industrial users at around 200 grid exit points across New Zealand.
New Zealand's annual electricity consumption ('demand') is nearly 40,000 gigawatt-hours (GWh). Almost two thirds of national demand is located in the North Island.
Spot prices can be an indicator of security of supply risk as typically they rise during 'dry years'. This page includes insights on recent wholesale spot price trends.

Security of Supply Policies

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We use several policies to manage the Security of Supply process.

The Emergency Management Policy (EMP) sets out the steps that we will take, as a reasonable and prudent operator, during an extended emergency.
We have prepared and published a Rolling Outage Plan and provided links to all approved participant plans.
Our Security of Supply Annual Assessments provide an assessment of the power system's ability to meet prudent winter energy and peak requirements over the next seven years.