Technical reports

Report on 2 March 2017 South Island AUFLS Event

On 2 March 2017, New Zealand experienced a major and complex power system event. The event resulted in the South Island power system splitting into two separate systems. Approximately 120 MW (16%) of electricity used by consumers in the upper part of the South Island was disconnected for up to 90 minutes.  

This report provides the findings from the System Operator's investigation into the event.

Ten Year Forecast of Fault Levels

This publication presents an update to the ten year forecast fault levels report. The Connection Code contained in Schedule 8 to the Benchmark Agreement requires Transpower to publish a ten year forecast of the expected fault levels at each customer point of service annually.

Transpower last published the Ten Year Forecast of Fault Levels in September 2015.



Energy use forecasting for heat pumps 2008

In 2008 BRANZ Ltd undertook a heat pump study report titled Active Cooling and Heat Pump Use in New Zealand. In order to fully understand the effect that this increase in heat pumps is having on the power system, and what effect it may have into the future, Transpower commissioned BRANZ to extend its research and evaluate the impact of heat pumps on the demand for electricity,