Operational Information

Power system operational data is published in this section.


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As the System Operator, we distribute several types of informational updates to registered participants of the electricity market.

Customer Advice Notices are information notices we send out to registered electricity market participants regarding events happening on the power system.
Excursion Notices are issued when a voltage or frequency disturbance occurs on the power system. The notice gives brief details about the disturbance.
Formal Notices are notices we send out to registered electricity market participants informing of events happening on the power system that require parties to take some action.

Published Data

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We publish live data on a 'best endeavours' basis. We take no responsibility for the actions taken by any party based on this information.

This report is updated on a Monday morning and displays energy supply and generation information for the previous week.
Power system data is displayed on this page grouped by island then fuel type. The current generation value is overlaid on the capacity for the fuel type. Data is refreshed every five minutes.
This page records the renewable energy on the power system over the last week, month and year. This page is updated weekly on a Tuesday.
This graph is updated daily and is based on the HVDC flows modelled by our Scheduling Pricing and Dispatch solutions.
View load information graphically on the New Zealand power system aggregated by our operational zones.
This table shows the load values for each of these zones over the last 30 minutes. The MW values shown in this table are derived from the Transpower SCADA system.
Power system loads in the North Island north of Huntly (Zone 1) are displayed on this page to give power companies loading information across the zone.
Power system loads in the South Island north of Waitaki Valley (Zone 3) are displayed on this page to give power companies loading information across the zone.

Security Management

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We implement security policies as defined in Transpower’s connection contract.

When the situation gets tight, the system operator will endeavour to notify the market via a CAN. This notice is triggered when there is 200MW or less of residual energy left to meet demand & reserves
This page provides links to industry websites that provide publicly available pricing information.
On the New Zealand power system, constraints are usually automatically generated by an application called SFT.
A coordinated outage process is used by asset owners to help with the co-ordination of planned equipment outages. The process uses a database in which all asset owners enter planned outage details.
In accordance with our obligations under the Security Policy of the Policy Statement, we assess the control requirements to categorise events as an extended contingent events.
Manual Load Shedding is the final step in a process that begins with us communicating with the distributors regarding a Grid Emergency and the likely demand reductions required.
As system operator we use Remedial Action Schemes (RAS) to model special protection schemes to manage the transmission system with improved accuracy and thereby improved security.
Special Protection Schemes are means by which circuit loadings, voltage or frequency can be controlled after an event on the power system which might otherwise cause an overload of equipment.